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<div class="section" id="module-Tkinter">
<span id="tkinter-python-interface-to-tcl-tk"></span><h1>24.1. <a class="reference internal" href="#module-Tkinter" title="Tkinter: Interface to Tcl/Tk for graphical user interfaces"><code class="xref py py-mod docutils literal notranslate"><span class="pre">Tkinter</span></code></a> — Python interface to Tcl/Tk<a class="headerlink" href="#module-Tkinter" title="Permalink to this headline">¶</a></h1>
<p>The <a class="reference internal" href="#module-Tkinter" title="Tkinter: Interface to Tcl/Tk for graphical user interfaces"><code class="xref py py-mod docutils literal notranslate"><span class="pre">Tkinter</span></code></a> module (“Tk interface”) is the standard Python interface to
the Tk GUI toolkit. Both Tk and <a class="reference internal" href="#module-Tkinter" title="Tkinter: Interface to Tcl/Tk for graphical user interfaces"><code class="xref py py-mod docutils literal notranslate"><span class="pre">Tkinter</span></code></a> are available on most Unix
platforms, as well as on Windows systems. (Tk itself is not part of Python; it
is maintained at ActiveState.)</p>
<p>Running <code class="docutils literal notranslate"><span class="pre">python</span> <span class="pre">-m</span> <span class="pre">Tkinter</span></code> from the command line should open a window
demonstrating a simple Tk interface, letting you know that <a class="reference internal" href="#module-Tkinter" title="Tkinter: Interface to Tcl/Tk for graphical user interfaces"><code class="xref py py-mod docutils literal notranslate"><span class="pre">Tkinter</span></code></a> is
properly installed on your system, and also showing what version of Tcl/Tk is
installed, so you can read the Tcl/Tk documentation specific to that version.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last"><a class="reference internal" href="#module-Tkinter" title="Tkinter: Interface to Tcl/Tk for graphical user interfaces"><code class="xref py py-mod docutils literal notranslate"><span class="pre">Tkinter</span></code></a> has been renamed to <code class="xref py py-mod docutils literal notranslate"><span class="pre">tkinter</span></code> in Python 3. The
<a class="reference internal" href="../glossary.html#term-2to3"><span class="xref std std-term">2to3</span></a> tool will automatically adapt imports when converting your
sources to Python 3.</p>
</div>
<div class="admonition seealso">
<p class="first admonition-title">See also</p>
<p>Tkinter documentation:</p>
<dl class="docutils">
<dt><a class="reference external" href="https://wiki.python.org/moin/TkInter">Python Tkinter Resources</a></dt>
<dd>The Python Tkinter Topic Guide provides a great deal of information on using Tk
from Python and links to other sources of information on Tk.</dd>
<dt><a class="reference external" href="http://www.tkdocs.com/">TKDocs</a></dt>
<dd>Extensive tutorial plus friendlier widget pages for some of the widgets.</dd>
<dt><a class="reference external" href="https://web.archive.org/web/20190524140835/https://infohost.nmt.edu/tcc/help/pubs/tkinter/web/index.html">Tkinter 8.5 reference: a GUI for Python</a></dt>
<dd>On-line reference material.</dd>
<dt><a class="reference external" href="http://effbot.org/tkinterbook/">Tkinter docs from effbot</a></dt>
<dd>Online reference for tkinter supported by effbot.org.</dd>
<dt><a class="reference external" href="http://learning-python.com/about-pp4e.html">Programming Python</a></dt>
<dd>Book by Mark Lutz, has excellent coverage of Tkinter.</dd>
<dt><a class="reference external" href="https://www.amazon.com/Modern-Tkinter-Python-Developers-ebook/dp/B0071QDNLO/">Modern Tkinter for Busy Python Developers</a></dt>
<dd>Book by Mark Roseman about building attractive and modern graphical user interfaces with Python and Tkinter.</dd>
<dt><a class="reference external" href="https://www.manning.com/books/python-and-tkinter-programming">Python and Tkinter Programming</a></dt>
<dd>Book by John Grayson (ISBN 1-884777-81-3).</dd>
</dl>
<p>Tcl/Tk documentation:</p>
<dl class="last docutils">
<dt><a class="reference external" href="https://www.tcl.tk/man/tcl8.6/TkCmd/contents.htm">Tk commands</a></dt>
<dd>Most commands are available as <a class="reference internal" href="#module-Tkinter" title="Tkinter: Interface to Tcl/Tk for graphical user interfaces"><code class="xref py py-mod docutils literal notranslate"><span class="pre">Tkinter</span></code></a> or <code class="xref py py-mod docutils literal notranslate"><span class="pre">Tkinter.ttk</span></code> classes.
Change ‘8.6’ to match the version of your Tcl/Tk installation.</dd>
<dt><a class="reference external" href="https://www.tcl.tk/doc/">Tcl/Tk recent man pages</a></dt>
<dd>Recent Tcl/Tk manuals on www.tcl.tk.</dd>
<dt><a class="reference external" href="http://tcl.activestate.com/">ActiveState Tcl Home Page</a></dt>
<dd>The Tk/Tcl development is largely taking place at ActiveState.</dd>
<dt><a class="reference external" href="https://www.amazon.com/exec/obidos/ASIN/020163337X">Tcl and the Tk Toolkit</a></dt>
<dd>Book by John Ousterhout, the inventor of Tcl.</dd>
<dt><a class="reference external" href="http://www.beedub.com/book/">Practical Programming in Tcl and Tk</a></dt>
<dd>Brent Welch’s encyclopedic book.</dd>
</dl>
</div>
<div class="section" id="tkinter-modules">
<h2>24.1.1. Tkinter Modules<a class="headerlink" href="#tkinter-modules" title="Permalink to this headline">¶</a></h2>
<p>Most of the time, the <a class="reference internal" href="#module-Tkinter" title="Tkinter: Interface to Tcl/Tk for graphical user interfaces"><code class="xref py py-mod docutils literal notranslate"><span class="pre">Tkinter</span></code></a> module is all you really need, but a number
of additional modules are available as well. The Tk interface is located in a
binary module named <code class="xref py py-mod docutils literal notranslate"><span class="pre">_tkinter</span></code>. This module contains the low-level
interface to Tk, and should never be used directly by application programmers.
It is usually a shared library (or DLL), but might in some cases be statically
linked with the Python interpreter.</p>
<p>In addition to the Tk interface module, <a class="reference internal" href="#module-Tkinter" title="Tkinter: Interface to Tcl/Tk for graphical user interfaces"><code class="xref py py-mod docutils literal notranslate"><span class="pre">Tkinter</span></code></a> includes a number of
Python modules. The two most important modules are the <a class="reference internal" href="#module-Tkinter" title="Tkinter: Interface to Tcl/Tk for graphical user interfaces"><code class="xref py py-mod docutils literal notranslate"><span class="pre">Tkinter</span></code></a> module
itself, and a module called <code class="xref py py-mod docutils literal notranslate"><span class="pre">Tkconstants</span></code>. The former automatically imports
the latter, so to use Tkinter, all you need to do is to import one module:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">Tkinter</span>
</pre></div>
</div>
<p>Or, more often:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">Tkinter</span> <span class="k">import</span> <span class="o">*</span>
</pre></div>
</div>
<dl class="class">
<dt id="Tkinter.Tk">
<em class="property">class </em><code class="descclassname">Tkinter.</code><code class="descname">Tk</code><span class="sig-paren">(</span><em>screenName=None</em>, <em>baseName=None</em>, <em>className='Tk'</em>, <em>useTk=1</em><span class="sig-paren">)</span><a class="headerlink" href="#Tkinter.Tk" title="Permalink to this definition">¶</a></dt>
<dd><p>The <a class="reference internal" href="#Tkinter.Tk" title="Tkinter.Tk"><code class="xref py py-class docutils literal notranslate"><span class="pre">Tk</span></code></a> class is instantiated without arguments. This creates a toplevel
widget of Tk which usually is the main window of an application. Each instance
has its own associated Tcl interpreter.</p>
<div class="versionchanged">
<p><span class="versionmodified">Changed in version 2.4: </span>The <em>useTk</em> parameter was added.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="Tkinter.Tcl">
<code class="descclassname">Tkinter.</code><code class="descname">Tcl</code><span class="sig-paren">(</span><em>screenName=None</em>, <em>baseName=None</em>, <em>className='Tk'</em>, <em>useTk=0</em><span class="sig-paren">)</span><a class="headerlink" href="#Tkinter.Tcl" title="Permalink to this definition">¶</a></dt>
<dd><p>The <a class="reference internal" href="#Tkinter.Tcl" title="Tkinter.Tcl"><code class="xref py py-func docutils literal notranslate"><span class="pre">Tcl()</span></code></a> function is a factory function which creates an object much like
that created by the <a class="reference internal" href="#Tkinter.Tk" title="Tkinter.Tk"><code class="xref py py-class docutils literal notranslate"><span class="pre">Tk</span></code></a> class, except that it does not initialize the Tk
subsystem. This is most often useful when driving the Tcl interpreter in an
environment where one doesn’t want to create extraneous toplevel windows, or
where one cannot (such as Unix/Linux systems without an X server). An object
created by the <a class="reference internal" href="#Tkinter.Tcl" title="Tkinter.Tcl"><code class="xref py py-func docutils literal notranslate"><span class="pre">Tcl()</span></code></a> object can have a Toplevel window created (and the Tk
subsystem initialized) by calling its <code class="xref py py-meth docutils literal notranslate"><span class="pre">loadtk()</span></code> method.</p>
<div class="versionadded">
<p><span class="versionmodified">New in version 2.4.</span></p>
</div>
</dd></dl>
<p>Other modules that provide Tk support include:</p>
<dl class="docutils">
<dt><a class="reference internal" href="scrolledtext.html#module-ScrolledText" title="ScrolledText: Text widget with a vertical scroll bar. (Tk)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">ScrolledText</span></code></a></dt>
<dd>Text widget with a vertical scroll bar built in.</dd>
<dt><code class="xref py py-mod docutils literal notranslate"><span class="pre">tkColorChooser</span></code></dt>
<dd>Dialog to let the user choose a color.</dd>
<dt><code class="xref py py-mod docutils literal notranslate"><span class="pre">tkCommonDialog</span></code></dt>
<dd>Base class for the dialogs defined in the other modules listed here.</dd>
<dt><code class="xref py py-mod docutils literal notranslate"><span class="pre">tkFileDialog</span></code></dt>
<dd>Common dialogs to allow the user to specify a file to open or save.</dd>
<dt><code class="xref py py-mod docutils literal notranslate"><span class="pre">tkFont</span></code></dt>
<dd>Utilities to help work with fonts.</dd>
<dt><code class="xref py py-mod docutils literal notranslate"><span class="pre">tkMessageBox</span></code></dt>
<dd>Access to standard Tk dialog boxes.</dd>
<dt><code class="xref py py-mod docutils literal notranslate"><span class="pre">tkSimpleDialog</span></code></dt>
<dd>Basic dialogs and convenience functions.</dd>
<dt><code class="xref py py-mod docutils literal notranslate"><span class="pre">Tkdnd</span></code></dt>
<dd>Drag-and-drop support for <a class="reference internal" href="#module-Tkinter" title="Tkinter: Interface to Tcl/Tk for graphical user interfaces"><code class="xref py py-mod docutils literal notranslate"><span class="pre">Tkinter</span></code></a>. This is experimental and should become
deprecated when it is replaced with the Tk DND.</dd>
<dt><a class="reference internal" href="turtle.html#module-turtle" title="turtle: Turtle graphics for Tk"><code class="xref py py-mod docutils literal notranslate"><span class="pre">turtle</span></code></a></dt>
<dd>Turtle graphics in a Tk window.</dd>
</dl>
<p>These have been renamed as well in Python 3; they were all made submodules of
the new <code class="docutils literal notranslate"><span class="pre">tkinter</span></code> package.</p>
</div>
<div class="section" id="tkinter-life-preserver">
<h2>24.1.2. Tkinter Life Preserver<a class="headerlink" href="#tkinter-life-preserver" title="Permalink to this headline">¶</a></h2>
<p>This section is not designed to be an exhaustive tutorial on either Tk or
Tkinter. Rather, it is intended as a stop gap, providing some introductory
orientation on the system.</p>
<p>Credits:</p>
<ul class="simple">
<li>Tkinter was written by Steen Lumholt and Guido van Rossum.</li>
<li>Tk was written by John Ousterhout while at Berkeley.</li>
<li>This Life Preserver was written by Matt Conway at the University of Virginia.</li>
<li>The html rendering, and some liberal editing, was produced from a FrameMaker
version by Ken Manheimer.</li>
<li>Fredrik Lundh elaborated and revised the class interface descriptions, to get
them current with Tk 4.2.</li>
<li>Mike Clarkson converted the documentation to LaTeX, and compiled the User
Interface chapter of the reference manual.</li>
</ul>
<div class="section" id="how-to-use-this-section">
<h3>24.1.2.1. How To Use This Section<a class="headerlink" href="#how-to-use-this-section" title="Permalink to this headline">¶</a></h3>
<p>This section is designed in two parts: the first half (roughly) covers
background material, while the second half can be taken to the keyboard as a
handy reference.</p>
<p>When trying to answer questions of the form “how do I do blah”, it is often best
to find out how to do “blah” in straight Tk, and then convert this back into the
corresponding <a class="reference internal" href="#module-Tkinter" title="Tkinter: Interface to Tcl/Tk for graphical user interfaces"><code class="xref py py-mod docutils literal notranslate"><span class="pre">Tkinter</span></code></a> call. Python programmers can often guess at the
correct Python command by looking at the Tk documentation. This means that in
order to use Tkinter, you will have to know a little bit about Tk. This document
can’t fulfill that role, so the best we can do is point you to the best
documentation that exists. Here are some hints:</p>
<ul class="simple">
<li>The authors strongly suggest getting a copy of the Tk man pages. Specifically,
the man pages in the <code class="docutils literal notranslate"><span class="pre">mann</span></code> directory are most useful. The <code class="docutils literal notranslate"><span class="pre">man3</span></code> man pages
describe the C interface to the Tk library and thus are not especially helpful
for script writers.</li>
<li>Addison-Wesley publishes a book called Tcl and the Tk Toolkit by John
Ousterhout (ISBN 0-201-63337-X) which is a good introduction to Tcl and Tk for
the novice. The book is not exhaustive, and for many details it defers to the
man pages.</li>
<li><code class="file docutils literal notranslate"><span class="pre">Tkinter.py</span></code> is a last resort for most, but can be a good place to go
when nothing else makes sense.</li>
</ul>
</div>
<div class="section" id="a-simple-hello-world-program">
<h3>24.1.2.2. A Simple Hello World Program<a class="headerlink" href="#a-simple-hello-world-program" title="Permalink to this headline">¶</a></h3>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">Tkinter</span> <span class="k">import</span> <span class="o">*</span>
<span class="k">class</span> <span class="nc">Application</span><span class="p">(</span><span class="n">Frame</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">say_hi</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="nb">print</span> <span class="s2">"hi there, everyone!"</span>
<span class="k">def</span> <span class="nf">createWidgets</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">QUIT</span> <span class="o">=</span> <span class="n">Button</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">QUIT</span><span class="p">[</span><span class="s2">"text"</span><span class="p">]</span> <span class="o">=</span> <span class="s2">"QUIT"</span>
<span class="bp">self</span><span class="o">.</span><span class="n">QUIT</span><span class="p">[</span><span class="s2">"fg"</span><span class="p">]</span> <span class="o">=</span> <span class="s2">"red"</span>
<span class="bp">self</span><span class="o">.</span><span class="n">QUIT</span><span class="p">[</span><span class="s2">"command"</span><span class="p">]</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">quit</span>
<span class="bp">self</span><span class="o">.</span><span class="n">QUIT</span><span class="o">.</span><span class="n">pack</span><span class="p">({</span><span class="s2">"side"</span><span class="p">:</span> <span class="s2">"left"</span><span class="p">})</span>
<span class="bp">self</span><span class="o">.</span><span class="n">hi_there</span> <span class="o">=</span> <span class="n">Button</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">hi_there</span><span class="p">[</span><span class="s2">"text"</span><span class="p">]</span> <span class="o">=</span> <span class="s2">"Hello"</span><span class="p">,</span>
<span class="bp">self</span><span class="o">.</span><span class="n">hi_there</span><span class="p">[</span><span class="s2">"command"</span><span class="p">]</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">say_hi</span>
<span class="bp">self</span><span class="o">.</span><span class="n">hi_there</span><span class="o">.</span><span class="n">pack</span><span class="p">({</span><span class="s2">"side"</span><span class="p">:</span> <span class="s2">"left"</span><span class="p">})</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">master</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="n">Frame</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">master</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">pack</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">createWidgets</span><span class="p">()</span>
<span class="n">root</span> <span class="o">=</span> <span class="n">Tk</span><span class="p">()</span>
<span class="n">app</span> <span class="o">=</span> <span class="n">Application</span><span class="p">(</span><span class="n">master</span><span class="o">=</span><span class="n">root</span><span class="p">)</span>
<span class="n">app</span><span class="o">.</span><span class="n">mainloop</span><span class="p">()</span>
<span class="n">root</span><span class="o">.</span><span class="n">destroy</span><span class="p">()</span>
</pre></div>
</div>
</div>
</div>
<div class="section" id="a-very-quick-look-at-tcl-tk">
<h2>24.1.3. A (Very) Quick Look at Tcl/Tk<a class="headerlink" href="#a-very-quick-look-at-tcl-tk" title="Permalink to this headline">¶</a></h2>
<p>The class hierarchy looks complicated, but in actual practice, application
programmers almost always refer to the classes at the very bottom of the
hierarchy.</p>
<p>Notes:</p>
<ul class="simple">
<li>These classes are provided for the purposes of organizing certain functions
under one namespace. They aren’t meant to be instantiated independently.</li>
<li>The <a class="reference internal" href="#Tkinter.Tk" title="Tkinter.Tk"><code class="xref py py-class docutils literal notranslate"><span class="pre">Tk</span></code></a> class is meant to be instantiated only once in an application.
Application programmers need not instantiate one explicitly, the system creates
one whenever any of the other classes are instantiated.</li>
<li>The <code class="xref py py-class docutils literal notranslate"><span class="pre">Widget</span></code> class is not meant to be instantiated, it is meant only
for subclassing to make “real” widgets (in C++, this is called an ‘abstract
class’).</li>
</ul>
<p>To make use of this reference material, there will be times when you will need
to know how to read short passages of Tk and how to identify the various parts
of a Tk command. (See section <a class="reference internal" href="#tkinter-basic-mapping"><span class="std std-ref">Mapping Basic Tk into Tkinter</span></a> for the
<a class="reference internal" href="#module-Tkinter" title="Tkinter: Interface to Tcl/Tk for graphical user interfaces"><code class="xref py py-mod docutils literal notranslate"><span class="pre">Tkinter</span></code></a> equivalents of what’s below.)</p>
<p>Tk scripts are Tcl programs. Like all Tcl programs, Tk scripts are just lists
of tokens separated by spaces. A Tk widget is just its <em>class</em>, the <em>options</em>
that help configure it, and the <em>actions</em> that make it do useful things.</p>
<p>To make a widget in Tk, the command is always of the form:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">classCommand</span> <span class="n">newPathname</span> <span class="n">options</span>
</pre></div>
</div>
<dl class="docutils">
<dt><em>classCommand</em></dt>
<dd>denotes which kind of widget to make (a button, a label, a menu…)</dd>
<dt><em>newPathname</em></dt>
<dd>is the new name for this widget. All names in Tk must be unique. To help
enforce this, widgets in Tk are named with <em>pathnames</em>, just like files in a
file system. The top level widget, the <em>root</em>, is called <code class="docutils literal notranslate"><span class="pre">.</span></code> (period) and
children are delimited by more periods. For example,
<code class="docutils literal notranslate"><span class="pre">.myApp.controlPanel.okButton</span></code> might be the name of a widget.</dd>
<dt><em>options</em></dt>
<dd>configure the widget’s appearance and in some cases, its behavior. The options
come in the form of a list of flags and values. Flags are preceded by a ‘-‘,
like Unix shell command flags, and values are put in quotes if they are more
than one word.</dd>
</dl>
<p>For example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">button</span> <span class="o">.</span><span class="n">fred</span> <span class="o">-</span><span class="n">fg</span> <span class="n">red</span> <span class="o">-</span><span class="n">text</span> <span class="s2">"hi there"</span>
<span class="o">^</span> <span class="o">^</span> \<span class="n">_____________________</span><span class="o">/</span>
<span class="o">|</span> <span class="o">|</span> <span class="o">|</span>
<span class="k">class</span> <span class="nc">new</span> <span class="n">options</span>
<span class="n">command</span> <span class="n">widget</span> <span class="p">(</span><span class="o">-</span><span class="n">opt</span> <span class="n">val</span> <span class="o">-</span><span class="n">opt</span> <span class="n">val</span> <span class="o">...</span><span class="p">)</span>
</pre></div>
</div>
<p>Once created, the pathname to the widget becomes a new command. This new
<em>widget command</em> is the programmer’s handle for getting the new widget to
perform some <em>action</em>. In C, you’d express this as someAction(fred,
someOptions), in C++, you would express this as fred.someAction(someOptions),
and in Tk, you say:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">.</span><span class="n">fred</span> <span class="n">someAction</span> <span class="n">someOptions</span>
</pre></div>
</div>
<p>Note that the object name, <code class="docutils literal notranslate"><span class="pre">.fred</span></code>, starts with a dot.</p>
<p>As you’d expect, the legal values for <em>someAction</em> will depend on the widget’s
class: <code class="docutils literal notranslate"><span class="pre">.fred</span> <span class="pre">disable</span></code> works if fred is a button (fred gets greyed out), but
does not work if fred is a label (disabling of labels is not supported in Tk).</p>
<p>The legal values of <em>someOptions</em> is action dependent. Some actions, like
<code class="docutils literal notranslate"><span class="pre">disable</span></code>, require no arguments, others, like a text-entry box’s <code class="docutils literal notranslate"><span class="pre">delete</span></code>
command, would need arguments to specify what range of text to delete.</p>
</div>
<div class="section" id="mapping-basic-tk-into-tkinter">
<span id="tkinter-basic-mapping"></span><h2>24.1.4. Mapping Basic Tk into Tkinter<a class="headerlink" href="#mapping-basic-tk-into-tkinter" title="Permalink to this headline">¶</a></h2>
<p>Class commands in Tk correspond to class constructors in Tkinter.</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">button</span> <span class="o">.</span><span class="n">fred</span> <span class="o">=====></span> <span class="n">fred</span> <span class="o">=</span> <span class="n">Button</span><span class="p">()</span>
</pre></div>
</div>
<p>The master of an object is implicit in the new name given to it at creation
time. In Tkinter, masters are specified explicitly.</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">button</span> <span class="o">.</span><span class="n">panel</span><span class="o">.</span><span class="n">fred</span> <span class="o">=====></span> <span class="n">fred</span> <span class="o">=</span> <span class="n">Button</span><span class="p">(</span><span class="n">panel</span><span class="p">)</span>
</pre></div>
</div>
<p>The configuration options in Tk are given in lists of hyphened tags followed by
values. In Tkinter, options are specified as keyword-arguments in the instance
constructor, and keyword-args for configure calls or as instance indices, in
dictionary style, for established instances. See section
<a class="reference internal" href="#tkinter-setting-options"><span class="std std-ref">Setting Options</span></a> on setting options.</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">button</span> <span class="o">.</span><span class="n">fred</span> <span class="o">-</span><span class="n">fg</span> <span class="n">red</span> <span class="o">=====></span> <span class="n">fred</span> <span class="o">=</span> <span class="n">Button</span><span class="p">(</span><span class="n">panel</span><span class="p">,</span> <span class="n">fg</span> <span class="o">=</span> <span class="s2">"red"</span><span class="p">)</span>
<span class="o">.</span><span class="n">fred</span> <span class="n">configure</span> <span class="o">-</span><span class="n">fg</span> <span class="n">red</span> <span class="o">=====></span> <span class="n">fred</span><span class="p">[</span><span class="s2">"fg"</span><span class="p">]</span> <span class="o">=</span> <span class="n">red</span>
<span class="n">OR</span> <span class="o">==></span> <span class="n">fred</span><span class="o">.</span><span class="n">config</span><span class="p">(</span><span class="n">fg</span> <span class="o">=</span> <span class="s2">"red"</span><span class="p">)</span>
</pre></div>
</div>
<p>In Tk, to perform an action on a widget, use the widget name as a command, and
follow it with an action name, possibly with arguments (options). In Tkinter,
you call methods on the class instance to invoke actions on the widget. The
actions (methods) that a given widget can perform are listed in the Tkinter.py
module.</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">.</span><span class="n">fred</span> <span class="n">invoke</span> <span class="o">=====></span> <span class="n">fred</span><span class="o">.</span><span class="n">invoke</span><span class="p">()</span>
</pre></div>
</div>
<p>To give a widget to the packer (geometry manager), you call pack with optional
arguments. In Tkinter, the Pack class holds all this functionality, and the
various forms of the pack command are implemented as methods. All widgets in
<a class="reference internal" href="#module-Tkinter" title="Tkinter: Interface to Tcl/Tk for graphical user interfaces"><code class="xref py py-mod docutils literal notranslate"><span class="pre">Tkinter</span></code></a> are subclassed from the Packer, and so inherit all the packing
methods. See the <a class="reference internal" href="tix.html#module-Tix" title="Tix: Tk Extension Widgets for Tkinter"><code class="xref py py-mod docutils literal notranslate"><span class="pre">Tix</span></code></a> module documentation for additional information on
the Form geometry manager.</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">pack</span> <span class="o">.</span><span class="n">fred</span> <span class="o">-</span><span class="n">side</span> <span class="n">left</span> <span class="o">=====></span> <span class="n">fred</span><span class="o">.</span><span class="n">pack</span><span class="p">(</span><span class="n">side</span> <span class="o">=</span> <span class="s2">"left"</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="how-tk-and-tkinter-are-related">
<h2>24.1.5. How Tk and Tkinter are Related<a class="headerlink" href="#how-tk-and-tkinter-are-related" title="Permalink to this headline">¶</a></h2>
<p>From the top down:</p>
<dl class="docutils">
<dt>Your App Here (Python)</dt>
<dd>A Python application makes a <a class="reference internal" href="#module-Tkinter" title="Tkinter: Interface to Tcl/Tk for graphical user interfaces"><code class="xref py py-mod docutils literal notranslate"><span class="pre">Tkinter</span></code></a> call.</dd>
<dt>Tkinter (Python Module)</dt>
<dd>This call (say, for example, creating a button widget), is implemented in the
<em>Tkinter</em> module, which is written in Python. This Python function will parse
the commands and the arguments and convert them into a form that makes them look
as if they had come from a Tk script instead of a Python script.</dd>
<dt>tkinter (C)</dt>
<dd>These commands and their arguments will be passed to a C function in the
<em>tkinter</em> - note the lowercase - extension module.</dd>
<dt>Tk Widgets (C and Tcl)</dt>
<dd>This C function is able to make calls into other C modules, including the C
functions that make up the Tk library. Tk is implemented in C and some Tcl.
The Tcl part of the Tk widgets is used to bind certain default behaviors to
widgets, and is executed once at the point where the Python <a class="reference internal" href="#module-Tkinter" title="Tkinter: Interface to Tcl/Tk for graphical user interfaces"><code class="xref py py-mod docutils literal notranslate"><span class="pre">Tkinter</span></code></a>
module is imported. (The user never sees this stage).</dd>
<dt>Tk (C)</dt>
<dd>The Tk part of the Tk Widgets implement the final mapping to …</dd>
<dt>Xlib (C)</dt>
<dd>the Xlib library to draw graphics on the screen.</dd>
</dl>
</div>
<div class="section" id="handy-reference">
<h2>24.1.6. Handy Reference<a class="headerlink" href="#handy-reference" title="Permalink to this headline">¶</a></h2>
<div class="section" id="setting-options">
<span id="tkinter-setting-options"></span><h3>24.1.6.1. Setting Options<a class="headerlink" href="#setting-options" title="Permalink to this headline">¶</a></h3>
<p>Options control things like the color and border width of a widget. Options can
be set in three ways:</p>
<dl class="docutils">
<dt>At object creation time, using keyword arguments</dt>
<dd><div class="first last highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">fred</span> <span class="o">=</span> <span class="n">Button</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">fg</span> <span class="o">=</span> <span class="s2">"red"</span><span class="p">,</span> <span class="n">bg</span> <span class="o">=</span> <span class="s2">"blue"</span><span class="p">)</span>
</pre></div>
</div>
</dd>
<dt>After object creation, treating the option name like a dictionary index</dt>
<dd><div class="first last highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">fred</span><span class="p">[</span><span class="s2">"fg"</span><span class="p">]</span> <span class="o">=</span> <span class="s2">"red"</span>
<span class="n">fred</span><span class="p">[</span><span class="s2">"bg"</span><span class="p">]</span> <span class="o">=</span> <span class="s2">"blue"</span>
</pre></div>
</div>
</dd>
<dt>Use the config() method to update multiple attrs subsequent to object creation</dt>
<dd><div class="first last highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">fred</span><span class="o">.</span><span class="n">config</span><span class="p">(</span><span class="n">fg</span> <span class="o">=</span> <span class="s2">"red"</span><span class="p">,</span> <span class="n">bg</span> <span class="o">=</span> <span class="s2">"blue"</span><span class="p">)</span>
</pre></div>
</div>
</dd>
</dl>
<p>For a complete explanation of a given option and its behavior, see the Tk man
pages for the widget in question.</p>
<p>Note that the man pages list “STANDARD OPTIONS” and “WIDGET SPECIFIC OPTIONS”
for each widget. The former is a list of options that are common to many
widgets, the latter are the options that are idiosyncratic to that particular
widget. The Standard Options are documented on the <em class="manpage">options(3)</em> man
page.</p>
<p>No distinction between standard and widget-specific options is made in this
document. Some options don’t apply to some kinds of widgets. Whether a given
widget responds to a particular option depends on the class of the widget;
buttons have a <code class="docutils literal notranslate"><span class="pre">command</span></code> option, labels do not.</p>
<p>The options supported by a given widget are listed in that widget’s man page, or
can be queried at runtime by calling the <code class="xref py py-meth docutils literal notranslate"><span class="pre">config()</span></code> method without
arguments, or by calling the <code class="xref py py-meth docutils literal notranslate"><span class="pre">keys()</span></code> method on that widget. The return
value of these calls is a dictionary whose key is the name of the option as a
string (for example, <code class="docutils literal notranslate"><span class="pre">'relief'</span></code>) and whose values are 5-tuples.</p>
<p>Some options, like <code class="docutils literal notranslate"><span class="pre">bg</span></code> are synonyms for common options with long names
(<code class="docutils literal notranslate"><span class="pre">bg</span></code> is shorthand for “background”). Passing the <code class="docutils literal notranslate"><span class="pre">config()</span></code> method the name
of a shorthand option will return a 2-tuple, not 5-tuple. The 2-tuple passed
back will contain the name of the synonym and the “real” option (such as
<code class="docutils literal notranslate"><span class="pre">('bg',</span> <span class="pre">'background')</span></code>).</p>
<table border="1" class="docutils">
<colgroup>
<col width="13%" />
<col width="61%" />
<col width="26%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Index</th>
<th class="head">Meaning</th>
<th class="head">Example</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>0</td>
<td>option name</td>
<td><code class="docutils literal notranslate"><span class="pre">'relief'</span></code></td>
</tr>
<tr class="row-odd"><td>1</td>
<td>option name for database lookup</td>
<td><code class="docutils literal notranslate"><span class="pre">'relief'</span></code></td>
</tr>
<tr class="row-even"><td>2</td>
<td>option class for database
lookup</td>
<td><code class="docutils literal notranslate"><span class="pre">'Relief'</span></code></td>
</tr>
<tr class="row-odd"><td>3</td>
<td>default value</td>
<td><code class="docutils literal notranslate"><span class="pre">'raised'</span></code></td>
</tr>
<tr class="row-even"><td>4</td>
<td>current value</td>
<td><code class="docutils literal notranslate"><span class="pre">'groove'</span></code></td>
</tr>
</tbody>
</table>
<p>Example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="nb">print</span> <span class="n">fred</span><span class="o">.</span><span class="n">config</span><span class="p">()</span>
<span class="go">{'relief': ('relief', 'relief', 'Relief', 'raised', 'groove')}</span>
</pre></div>
</div>
<p>Of course, the dictionary printed will include all the options available and
their values. This is meant only as an example.</p>
</div>
<div class="section" id="the-packer">
<h3>24.1.6.2. The Packer<a class="headerlink" href="#the-packer" title="Permalink to this headline">¶</a></h3>
<p id="index-0">The packer is one of Tk’s geometry-management mechanisms. Geometry managers
are used to specify the relative positioning of the positioning of widgets
within their container - their mutual <em>master</em>. In contrast to the more
cumbersome <em>placer</em> (which is used less commonly, and we do not cover here), the
packer takes qualitative relationship specification - <em>above</em>, <em>to the left of</em>,
<em>filling</em>, etc - and works everything out to determine the exact placement
coordinates for you.</p>
<p>The size of any <em>master</em> widget is determined by the size of the “slave widgets”
inside. The packer is used to control where slave widgets appear inside the
master into which they are packed. You can pack widgets into frames, and frames
into other frames, in order to achieve the kind of layout you desire.
Additionally, the arrangement is dynamically adjusted to accommodate incremental
changes to the configuration, once it is packed.</p>
<p>Note that widgets do not appear until they have had their geometry specified
with a geometry manager. It’s a common early mistake to leave out the geometry
specification, and then be surprised when the widget is created but nothing
appears. A widget will appear only after it has had, for example, the packer’s
<code class="xref py py-meth docutils literal notranslate"><span class="pre">pack()</span></code> method applied to it.</p>
<p>The pack() method can be called with keyword-option/value pairs that control
where the widget is to appear within its container, and how it is to behave when
the main application window is resized. Here are some examples:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">fred</span><span class="o">.</span><span class="n">pack</span><span class="p">()</span> <span class="c1"># defaults to side = "top"</span>
<span class="n">fred</span><span class="o">.</span><span class="n">pack</span><span class="p">(</span><span class="n">side</span> <span class="o">=</span> <span class="s2">"left"</span><span class="p">)</span>
<span class="n">fred</span><span class="o">.</span><span class="n">pack</span><span class="p">(</span><span class="n">expand</span> <span class="o">=</span> <span class="mi">1</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="packer-options">
<h3>24.1.6.3. Packer Options<a class="headerlink" href="#packer-options" title="Permalink to this headline">¶</a></h3>
<p>For more extensive information on the packer and the options that it can take,
see the man pages and page 183 of John Ousterhout’s book.</p>
<dl class="docutils">
<dt>anchor</dt>
<dd>Anchor type. Denotes where the packer is to place each slave in its parcel.</dd>
<dt>expand</dt>
<dd>Boolean, <code class="docutils literal notranslate"><span class="pre">0</span></code> or <code class="docutils literal notranslate"><span class="pre">1</span></code>.</dd>
<dt>fill</dt>
<dd>Legal values: <code class="docutils literal notranslate"><span class="pre">'x'</span></code>, <code class="docutils literal notranslate"><span class="pre">'y'</span></code>, <code class="docutils literal notranslate"><span class="pre">'both'</span></code>, <code class="docutils literal notranslate"><span class="pre">'none'</span></code>.</dd>
<dt>ipadx and ipady</dt>
<dd>A distance - designating internal padding on each side of the slave widget.</dd>
<dt>padx and pady</dt>
<dd>A distance - designating external padding on each side of the slave widget.</dd>
<dt>side</dt>
<dd>Legal values are: <code class="docutils literal notranslate"><span class="pre">'left'</span></code>, <code class="docutils literal notranslate"><span class="pre">'right'</span></code>, <code class="docutils literal notranslate"><span class="pre">'top'</span></code>, <code class="docutils literal notranslate"><span class="pre">'bottom'</span></code>.</dd>
</dl>
</div>
<div class="section" id="coupling-widget-variables">
<h3>24.1.6.4. Coupling Widget Variables<a class="headerlink" href="#coupling-widget-variables" title="Permalink to this headline">¶</a></h3>
<p>The current-value setting of some widgets (like text entry widgets) can be
connected directly to application variables by using special options. These
options are <code class="docutils literal notranslate"><span class="pre">variable</span></code>, <code class="docutils literal notranslate"><span class="pre">textvariable</span></code>, <code class="docutils literal notranslate"><span class="pre">onvalue</span></code>, <code class="docutils literal notranslate"><span class="pre">offvalue</span></code>, and
<code class="docutils literal notranslate"><span class="pre">value</span></code>. This connection works both ways: if the variable changes for any
reason, the widget it’s connected to will be updated to reflect the new value.</p>
<p>Unfortunately, in the current implementation of <a class="reference internal" href="#module-Tkinter" title="Tkinter: Interface to Tcl/Tk for graphical user interfaces"><code class="xref py py-mod docutils literal notranslate"><span class="pre">Tkinter</span></code></a> it is not
possible to hand over an arbitrary Python variable to a widget through a
<code class="docutils literal notranslate"><span class="pre">variable</span></code> or <code class="docutils literal notranslate"><span class="pre">textvariable</span></code> option. The only kinds of variables for which
this works are variables that are subclassed from a class called Variable,
defined in the <a class="reference internal" href="#module-Tkinter" title="Tkinter: Interface to Tcl/Tk for graphical user interfaces"><code class="xref py py-mod docutils literal notranslate"><span class="pre">Tkinter</span></code></a> module.</p>
<p>There are many useful subclasses of Variable already defined:
<code class="xref py py-class docutils literal notranslate"><span class="pre">StringVar</span></code>, <code class="xref py py-class docutils literal notranslate"><span class="pre">IntVar</span></code>, <code class="xref py py-class docutils literal notranslate"><span class="pre">DoubleVar</span></code>, and
<code class="xref py py-class docutils literal notranslate"><span class="pre">BooleanVar</span></code>. To read the current value of such a variable, call the
<code class="xref py py-meth docutils literal notranslate"><span class="pre">get()</span></code> method on it, and to change its value you call the <code class="xref py py-meth docutils literal notranslate"><span class="pre">set()</span></code>
method. If you follow this protocol, the widget will always track the value of
the variable, with no further intervention on your part.</p>
<p>For example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">App</span><span class="p">(</span><span class="n">Frame</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">master</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="n">Frame</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">master</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">pack</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">entrythingy</span> <span class="o">=</span> <span class="n">Entry</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">entrythingy</span><span class="o">.</span><span class="n">pack</span><span class="p">()</span>
<span class="c1"># here is the application variable</span>
<span class="bp">self</span><span class="o">.</span><span class="n">contents</span> <span class="o">=</span> <span class="n">StringVar</span><span class="p">()</span>
<span class="c1"># set it to some value</span>
<span class="bp">self</span><span class="o">.</span><span class="n">contents</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"this is a variable"</span><span class="p">)</span>
<span class="c1"># tell the entry widget to watch this variable</span>
<span class="bp">self</span><span class="o">.</span><span class="n">entrythingy</span><span class="p">[</span><span class="s2">"textvariable"</span><span class="p">]</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">contents</span>
<span class="c1"># and here we get a callback when the user hits return.</span>
<span class="c1"># we will have the program print out the value of the</span>
<span class="c1"># application variable when the user hits return</span>
<span class="bp">self</span><span class="o">.</span><span class="n">entrythingy</span><span class="o">.</span><span class="n">bind</span><span class="p">(</span><span class="s1">'<Key-Return>'</span><span class="p">,</span>
<span class="bp">self</span><span class="o">.</span><span class="n">print_contents</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">print_contents</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">event</span><span class="p">):</span>
<span class="nb">print</span> <span class="s2">"hi. contents of entry is now ---->"</span><span class="p">,</span> \
<span class="bp">self</span><span class="o">.</span><span class="n">contents</span><span class="o">.</span><span class="n">get</span><span class="p">()</span>
</pre></div>
</div>
</div>
<div class="section" id="the-window-manager">
<h3>24.1.6.5. The Window Manager<a class="headerlink" href="#the-window-manager" title="Permalink to this headline">¶</a></h3>
<p id="index-1">In Tk, there is a utility command, <code class="docutils literal notranslate"><span class="pre">wm</span></code>, for interacting with the window
manager. Options to the <code class="docutils literal notranslate"><span class="pre">wm</span></code> command allow you to control things like titles,
placement, icon bitmaps, and the like. In <a class="reference internal" href="#module-Tkinter" title="Tkinter: Interface to Tcl/Tk for graphical user interfaces"><code class="xref py py-mod docutils literal notranslate"><span class="pre">Tkinter</span></code></a>, these commands have
been implemented as methods on the <code class="xref py py-class docutils literal notranslate"><span class="pre">Wm</span></code> class. Toplevel widgets are
subclassed from the <code class="xref py py-class docutils literal notranslate"><span class="pre">Wm</span></code> class, and so can call the <code class="xref py py-class docutils literal notranslate"><span class="pre">Wm</span></code> methods
directly.</p>
<p>To get at the toplevel window that contains a given widget, you can often just
refer to the widget’s master. Of course if the widget has been packed inside of
a frame, the master won’t represent a toplevel window. To get at the toplevel
window that contains an arbitrary widget, you can call the <code class="xref py py-meth docutils literal notranslate"><span class="pre">_root()</span></code> method.
This method begins with an underscore to denote the fact that this function is
part of the implementation, and not an interface to Tk functionality.</p>
<p>Here are some examples of typical usage:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">Tkinter</span> <span class="k">import</span> <span class="o">*</span>
<span class="k">class</span> <span class="nc">App</span><span class="p">(</span><span class="n">Frame</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">master</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="n">Frame</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">master</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">pack</span><span class="p">()</span>
<span class="c1"># create the application</span>
<span class="n">myapp</span> <span class="o">=</span> <span class="n">App</span><span class="p">()</span>
<span class="c1">#</span>
<span class="c1"># here are method calls to the window manager class</span>
<span class="c1">#</span>
<span class="n">myapp</span><span class="o">.</span><span class="n">master</span><span class="o">.</span><span class="n">title</span><span class="p">(</span><span class="s2">"My Do-Nothing Application"</span><span class="p">)</span>
<span class="n">myapp</span><span class="o">.</span><span class="n">master</span><span class="o">.</span><span class="n">maxsize</span><span class="p">(</span><span class="mi">1000</span><span class="p">,</span> <span class="mi">400</span><span class="p">)</span>
<span class="c1"># start the program</span>
<span class="n">myapp</span><span class="o">.</span><span class="n">mainloop</span><span class="p">()</span>
</pre></div>
</div>
</div>
<div class="section" id="tk-option-data-types">
<h3>24.1.6.6. Tk Option Data Types<a class="headerlink" href="#tk-option-data-types" title="Permalink to this headline">¶</a></h3>
<dl class="docutils" id="index-2">
<dt>anchor</dt>
<dd>Legal values are points of the compass: <code class="docutils literal notranslate"><span class="pre">"n"</span></code>, <code class="docutils literal notranslate"><span class="pre">"ne"</span></code>, <code class="docutils literal notranslate"><span class="pre">"e"</span></code>, <code class="docutils literal notranslate"><span class="pre">"se"</span></code>,
<code class="docutils literal notranslate"><span class="pre">"s"</span></code>, <code class="docutils literal notranslate"><span class="pre">"sw"</span></code>, <code class="docutils literal notranslate"><span class="pre">"w"</span></code>, <code class="docutils literal notranslate"><span class="pre">"nw"</span></code>, and also <code class="docutils literal notranslate"><span class="pre">"center"</span></code>.</dd>
<dt>bitmap</dt>
<dd>There are eight built-in, named bitmaps: <code class="docutils literal notranslate"><span class="pre">'error'</span></code>, <code class="docutils literal notranslate"><span class="pre">'gray25'</span></code>,
<code class="docutils literal notranslate"><span class="pre">'gray50'</span></code>, <code class="docutils literal notranslate"><span class="pre">'hourglass'</span></code>, <code class="docutils literal notranslate"><span class="pre">'info'</span></code>, <code class="docutils literal notranslate"><span class="pre">'questhead'</span></code>, <code class="docutils literal notranslate"><span class="pre">'question'</span></code>,
<code class="docutils literal notranslate"><span class="pre">'warning'</span></code>. To specify an X bitmap filename, give the full path to the file,
preceded with an <code class="docutils literal notranslate"><span class="pre">@</span></code>, as in <code class="docutils literal notranslate"><span class="pre">"@/usr/contrib/bitmap/gumby.bit"</span></code>.</dd>
<dt>boolean</dt>
<dd>You can pass integers 0 or 1 or the strings <code class="docutils literal notranslate"><span class="pre">"yes"</span></code> or <code class="docutils literal notranslate"><span class="pre">"no"</span></code>.</dd>
<dt>callback</dt>
<dd><p class="first">This is any Python function that takes no arguments. For example:</p>
<div class="last highlight-default notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">print_it</span><span class="p">():</span>
<span class="nb">print</span> <span class="s2">"hi there"</span>
<span class="n">fred</span><span class="p">[</span><span class="s2">"command"</span><span class="p">]</span> <span class="o">=</span> <span class="n">print_it</span>
</pre></div>
</div>
</dd>
<dt>color</dt>
<dd>Colors can be given as the names of X colors in the rgb.txt file, or as strings
representing RGB values in 4 bit: <code class="docutils literal notranslate"><span class="pre">"#RGB"</span></code>, 8 bit: <code class="docutils literal notranslate"><span class="pre">"#RRGGBB"</span></code>, 12 bit”
<code class="docutils literal notranslate"><span class="pre">"#RRRGGGBBB"</span></code>, or 16 bit <code class="docutils literal notranslate"><span class="pre">"#RRRRGGGGBBBB"</span></code> ranges, where R,G,B here
represent any legal hex digit. See page 160 of Ousterhout’s book for details.</dd>
<dt>cursor</dt>
<dd>The standard X cursor names from <code class="file docutils literal notranslate"><span class="pre">cursorfont.h</span></code> can be used, without the
<code class="docutils literal notranslate"><span class="pre">XC_</span></code> prefix. For example to get a hand cursor (<code class="xref py py-const docutils literal notranslate"><span class="pre">XC_hand2</span></code>), use the
string <code class="docutils literal notranslate"><span class="pre">"hand2"</span></code>. You can also specify a bitmap and mask file of your own.
See page 179 of Ousterhout’s book.</dd>
<dt>distance</dt>
<dd>Screen distances can be specified in either pixels or absolute distances.
Pixels are given as numbers and absolute distances as strings, with the trailing
character denoting units: <code class="docutils literal notranslate"><span class="pre">c</span></code> for centimetres, <code class="docutils literal notranslate"><span class="pre">i</span></code> for inches, <code class="docutils literal notranslate"><span class="pre">m</span></code> for
millimetres, <code class="docutils literal notranslate"><span class="pre">p</span></code> for printer’s points. For example, 3.5 inches is expressed
as <code class="docutils literal notranslate"><span class="pre">"3.5i"</span></code>.</dd>
<dt>font</dt>
<dd>Tk uses a list font name format, such as <code class="docutils literal notranslate"><span class="pre">{courier</span> <span class="pre">10</span> <span class="pre">bold}</span></code>. Font sizes with
positive numbers are measured in points; sizes with negative numbers are
measured in pixels.</dd>
<dt>geometry</dt>
<dd>This is a string of the form <code class="docutils literal notranslate"><span class="pre">widthxheight</span></code>, where width and height are
measured in pixels for most widgets (in characters for widgets displaying text).
For example: <code class="docutils literal notranslate"><span class="pre">fred["geometry"]</span> <span class="pre">=</span> <span class="pre">"200x100"</span></code>.</dd>
<dt>justify</dt>
<dd>Legal values are the strings: <code class="docutils literal notranslate"><span class="pre">"left"</span></code>, <code class="docutils literal notranslate"><span class="pre">"center"</span></code>, <code class="docutils literal notranslate"><span class="pre">"right"</span></code>, and
<code class="docutils literal notranslate"><span class="pre">"fill"</span></code>.</dd>
<dt>region</dt>
<dd>This is a string with four space-delimited elements, each of which is a legal
distance (see above). For example: <code class="docutils literal notranslate"><span class="pre">"2</span> <span class="pre">3</span> <span class="pre">4</span> <span class="pre">5"</span></code> and <code class="docutils literal notranslate"><span class="pre">"3i</span> <span class="pre">2i</span> <span class="pre">4.5i</span> <span class="pre">2i"</span></code> and
<code class="docutils literal notranslate"><span class="pre">"3c</span> <span class="pre">2c</span> <span class="pre">4c</span> <span class="pre">10.43c"</span></code> are all legal regions.</dd>
<dt>relief</dt>
<dd>Determines what the border style of a widget will be. Legal values are:
<code class="docutils literal notranslate"><span class="pre">"raised"</span></code>, <code class="docutils literal notranslate"><span class="pre">"sunken"</span></code>, <code class="docutils literal notranslate"><span class="pre">"flat"</span></code>, <code class="docutils literal notranslate"><span class="pre">"groove"</span></code>, and <code class="docutils literal notranslate"><span class="pre">"ridge"</span></code>.</dd>
<dt>scrollcommand</dt>
<dd>This is almost always the <code class="xref py py-meth docutils literal notranslate"><span class="pre">set()</span></code> method of some scrollbar widget, but can
be any widget method that takes a single argument. Refer to the file
<code class="file docutils literal notranslate"><span class="pre">Demo/tkinter/matt/canvas-with-scrollbars.py</span></code> in the Python source
distribution for an example.</dd>
<dt>wrap:</dt>
<dd>Must be one of: <code class="docutils literal notranslate"><span class="pre">"none"</span></code>, <code class="docutils literal notranslate"><span class="pre">"char"</span></code>, or <code class="docutils literal notranslate"><span class="pre">"word"</span></code>.</dd>
</dl>
</div>
<div class="section" id="bindings-and-events">
<h3>24.1.6.7. Bindings and Events<a class="headerlink" href="#bindings-and-events" title="Permalink to this headline">¶</a></h3>
<p id="index-3">The bind method from the widget command allows you to watch for certain events
and to have a callback function trigger when that event type occurs. The form
of the bind method is:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">bind</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">sequence</span><span class="p">,</span> <span class="n">func</span><span class="p">,</span> <span class="n">add</span><span class="o">=</span><span class="s1">''</span><span class="p">):</span>
</pre></div>
</div>
<p>where:</p>
<dl class="docutils">
<dt>sequence</dt>
<dd>is a string that denotes the target kind of event. (See the bind man page and
page 201 of John Ousterhout’s book for details).</dd>
<dt>func</dt>
<dd>is a Python function, taking one argument, to be invoked when the event occurs.
An Event instance will be passed as the argument. (Functions deployed this way
are commonly known as <em>callbacks</em>.)</dd>
<dt>add</dt>
<dd>is optional, either <code class="docutils literal notranslate"><span class="pre">''</span></code> or <code class="docutils literal notranslate"><span class="pre">'+'</span></code>. Passing an empty string denotes that
this binding is to replace any other bindings that this event is associated
with. Passing a <code class="docutils literal notranslate"><span class="pre">'+'</span></code> means that this function is to be added to the list
of functions bound to this event type.</dd>
</dl>
<p>For example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">turnRed</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">event</span><span class="p">):</span>
<span class="n">event</span><span class="o">.</span><span class="n">widget</span><span class="p">[</span><span class="s2">"activeforeground"</span><span class="p">]</span> <span class="o">=</span> <span class="s2">"red"</span>
<span class="bp">self</span><span class="o">.</span><span class="n">button</span><span class="o">.</span><span class="n">bind</span><span class="p">(</span><span class="s2">"<Enter>"</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">turnRed</span><span class="p">)</span>
</pre></div>
</div>
<p>Notice how the widget field of the event is being accessed in the
<code class="xref py py-meth docutils literal notranslate"><span class="pre">turnRed()</span></code> callback. This field contains the widget that caught the X
event. The following table lists the other event fields you can access, and how
they are denoted in Tk, which can be useful when referring to the Tk man pages.</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Tk</span> <span class="n">Tkinter</span> <span class="n">Event</span> <span class="n">Field</span> <span class="n">Tk</span> <span class="n">Tkinter</span> <span class="n">Event</span> <span class="n">Field</span>
<span class="o">--</span> <span class="o">-------------------</span> <span class="o">--</span> <span class="o">-------------------</span>
<span class="o">%</span><span class="n">f</span> <span class="n">focus</span> <span class="o">%</span><span class="n">A</span> <span class="n">char</span>
<span class="o">%</span><span class="n">h</span> <span class="n">height</span> <span class="o">%</span><span class="n">E</span> <span class="n">send_event</span>
<span class="o">%</span><span class="n">k</span> <span class="n">keycode</span> <span class="o">%</span><span class="n">K</span> <span class="n">keysym</span>
<span class="o">%</span><span class="n">s</span> <span class="n">state</span> <span class="o">%</span><span class="n">N</span> <span class="n">keysym_num</span>
<span class="o">%</span><span class="n">t</span> <span class="n">time</span> <span class="o">%</span><span class="n">T</span> <span class="nb">type</span>
<span class="o">%</span><span class="n">w</span> <span class="n">width</span> <span class="o">%</span><span class="n">W</span> <span class="n">widget</span>
<span class="o">%</span><span class="n">x</span> <span class="n">x</span> <span class="o">%</span><span class="n">X</span> <span class="n">x_root</span>
<span class="o">%</span><span class="n">y</span> <span class="n">y</span> <span class="o">%</span><span class="n">Y</span> <span class="n">y_root</span>
</pre></div>
</div>
</div>
<div class="section" id="the-index-parameter">
<h3>24.1.6.8. The index Parameter<a class="headerlink" href="#the-index-parameter" title="Permalink to this headline">¶</a></h3>
<p>A number of widgets require”index” parameters to be passed. These are used to
point at a specific place in a Text widget, or to particular characters in an
Entry widget, or to particular menu items in a Menu widget.</p>
<dl class="docutils">
<dt>Entry widget indexes (index, view index, etc.)</dt>
<dd><p class="first">Entry widgets have options that refer to character positions in the text being
displayed. You can use these <a class="reference internal" href="#module-Tkinter" title="Tkinter: Interface to Tcl/Tk for graphical user interfaces"><code class="xref py py-mod docutils literal notranslate"><span class="pre">Tkinter</span></code></a> functions to access these special
points in text widgets:</p>
<dl class="last docutils">
<dt>AtEnd()</dt>
<dd>refers to the last position in the text</dd>
<dt>AtInsert()</dt>
<dd>refers to the point where the text cursor is</dd>
<dt>AtSelFirst()</dt>
<dd>indicates the beginning point of the selected text</dd>
<dt>AtSelLast()</dt>
<dd>denotes the last point of the selected text and finally</dd>
<dt>At(x[, y])</dt>
<dd>refers to the character at pixel location <em>x</em>, <em>y</em> (with <em>y</em> not used in the
case of a text entry widget, which contains a single line of text).</dd>
</dl>
</dd>
<dt>Text widget indexes</dt>
<dd>The index notation for Text widgets is very rich and is best described in the Tk
man pages.</dd>
<dt>Menu indexes (menu.invoke(), menu.entryconfig(), etc.)</dt>
<dd><p class="first">Some options and methods for menus manipulate specific menu entries. Anytime a
menu index is needed for an option or a parameter, you may pass in:</p>
<ul class="last simple">
<li>an integer which refers to the numeric position of the entry in the widget,
counted from the top, starting with 0;</li>
<li>the string <code class="docutils literal notranslate"><span class="pre">'active'</span></code>, which refers to the menu position that is currently
under the cursor;</li>
<li>the string <code class="docutils literal notranslate"><span class="pre">"last"</span></code> which refers to the last menu item;</li>
<li>An integer preceded by <code class="docutils literal notranslate"><span class="pre">@</span></code>, as in <code class="docutils literal notranslate"><span class="pre">@6</span></code>, where the integer is interpreted
as a y pixel coordinate in the menu’s coordinate system;</li>
<li>the string <code class="docutils literal notranslate"><span class="pre">"none"</span></code>, which indicates no menu entry at all, most often used
with menu.activate() to deactivate all entries, and finally,</li>
<li>a text string that is pattern matched against the label of the menu entry, as
scanned from the top of the menu to the bottom. Note that this index type is
considered after all the others, which means that matches for menu items
labelled <code class="docutils literal notranslate"><span class="pre">last</span></code>, <code class="docutils literal notranslate"><span class="pre">active</span></code>, or <code class="docutils literal notranslate"><span class="pre">none</span></code> may be interpreted as the above
literals, instead.</li>
</ul>
</dd>
</dl>
</div>
<div class="section" id="images">
<h3>24.1.6.9. Images<a class="headerlink" href="#images" title="Permalink to this headline">¶</a></h3>
<p>Images of different formats can be created through the corresponding subclass
of <code class="xref py py-class docutils literal notranslate"><span class="pre">Tkinter.Image</span></code>:</p>
<ul class="simple">
<li><code class="xref py py-class docutils literal notranslate"><span class="pre">BitmapImage</span></code> for images in XBM format.</li>
<li><code class="xref py py-class docutils literal notranslate"><span class="pre">PhotoImage</span></code> for images in PGM, PPM, GIF and PNG formats. The latter
is supported starting with Tk 8.6.</li>
</ul>
<p>Either type of image is created through either the <code class="docutils literal notranslate"><span class="pre">file</span></code> or the <code class="docutils literal notranslate"><span class="pre">data</span></code>
option (other options are available as well).</p>
<p>The image object can then be used wherever an <code class="docutils literal notranslate"><span class="pre">image</span></code> option is supported by
some widget (e.g. labels, buttons, menus). In these cases, Tk will not keep a
reference to the image. When the last Python reference to the image object is
deleted, the image data is deleted as well, and Tk will display an empty box
wherever the image was used.</p>
<div class="admonition seealso">
<p class="first admonition-title">See also</p>
<p class="last">The <a class="reference external" href="http://python-pillow.org/">Pillow</a> package adds support for
formats such as BMP, JPEG, TIFF, and WebP, among others.</p>
</div>
</div>
</div>
<div class="section" id="file-handlers">
<span id="tkinter-file-handlers"></span><h2>24.1.7. File Handlers<a class="headerlink" href="#file-handlers" title="Permalink to this headline">¶</a></h2>
<p>Tk allows you to register and unregister a callback function which will be
called from the Tk mainloop when I/O is possible on a file descriptor.
Only one handler may be registered per file descriptor. Example code:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">Tkinter</span>
<span class="n">widget</span> <span class="o">=</span> <span class="n">Tkinter</span><span class="o">.</span><span class="n">Tk</span><span class="p">()</span>
<span class="n">mask</span> <span class="o">=</span> <span class="n">Tkinter</span><span class="o">.</span><span class="n">READABLE</span> <span class="o">|</span> <span class="n">Tkinter</span><span class="o">.</span><span class="n">WRITABLE</span>
<span class="n">widget</span><span class="o">.</span><span class="n">tk</span><span class="o">.</span><span class="n">createfilehandler</span><span class="p">(</span><span class="n">file</span><span class="p">,</span> <span class="n">mask</span><span class="p">,</span> <span class="n">callback</span><span class="p">)</span>
<span class="o">...</span>
<span class="n">widget</span><span class="o">.</span><span class="n">tk</span><span class="o">.</span><span class="n">deletefilehandler</span><span class="p">(</span><span class="n">file</span><span class="p">)</span>
</pre></div>
</div>
<p>This feature is not available on Windows.</p>
<p>Since you don’t know how many bytes are available for reading, you may not
want to use the <a class="reference internal" href="io.html#io.BufferedIOBase" title="io.BufferedIOBase"><code class="xref py py-class docutils literal notranslate"><span class="pre">BufferedIOBase</span></code></a> or <a class="reference internal" href="io.html#io.TextIOBase" title="io.TextIOBase"><code class="xref py py-class docutils literal notranslate"><span class="pre">TextIOBase</span></code></a>
<a class="reference internal" href="io.html#io.BufferedIOBase.read" title="io.BufferedIOBase.read"><code class="xref py py-meth docutils literal notranslate"><span class="pre">read()</span></code></a> or <a class="reference internal" href="io.html#io.IOBase.readline" title="io.IOBase.readline"><code class="xref py py-meth docutils literal notranslate"><span class="pre">readline()</span></code></a> methods,
since these will insist on reading a predefined number of bytes.
For sockets, the <a class="reference internal" href="socket.html#socket.socket.recv" title="socket.socket.recv"><code class="xref py py-meth docutils literal notranslate"><span class="pre">recv()</span></code></a> or
<a class="reference internal" href="socket.html#socket.socket.recvfrom" title="socket.socket.recvfrom"><code class="xref py py-meth docutils literal notranslate"><span class="pre">recvfrom()</span></code></a> methods will work fine; for other files,
use raw reads or <code class="docutils literal notranslate"><span class="pre">os.read(file.fileno(),</span> <span class="pre">maxbytecount)</span></code>.</p>
<dl class="method">
<dt id="Tkinter.Widget.tk.createfilehandler">
<code class="descclassname">Widget.tk.</code><code class="descname">createfilehandler</code><span class="sig-paren">(</span><em>file</em>, <em>mask</em>, <em>func</em><span class="sig-paren">)</span><a class="headerlink" href="#Tkinter.Widget.tk.createfilehandler" title="Permalink to this definition">¶</a></dt>
<dd><p>Registers the file handler callback function <em>func</em>. The <em>file</em> argument
may either be an object with a <a class="reference internal" href="io.html#io.IOBase.fileno" title="io.IOBase.fileno"><code class="xref py py-meth docutils literal notranslate"><span class="pre">fileno()</span></code></a> method (such as
a file or socket object), or an integer file descriptor. The <em>mask</em>
argument is an ORed combination of any of the three constants below.
The callback is called as follows:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">callback</span><span class="p">(</span><span class="n">file</span><span class="p">,</span> <span class="n">mask</span><span class="p">)</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="Tkinter.Widget.tk.deletefilehandler">
<code class="descclassname">Widget.tk.</code><code class="descname">deletefilehandler</code><span class="sig-paren">(</span><em>file</em><span class="sig-paren">)</span><a class="headerlink" href="#Tkinter.Widget.tk.deletefilehandler" title="Permalink to this definition">¶</a></dt>
<dd><p>Unregisters a file handler.</p>
</dd></dl>
<dl class="data">
<dt id="Tkinter.READABLE">
<code class="descclassname">Tkinter.</code><code class="descname">READABLE</code><a class="headerlink" href="#Tkinter.READABLE" title="Permalink to this definition">¶</a></dt>
<dt id="Tkinter.WRITABLE">
<code class="descclassname">Tkinter.</code><code class="descname">WRITABLE</code><a class="headerlink" href="#Tkinter.WRITABLE" title="Permalink to this definition">¶</a></dt>
<dt id="Tkinter.EXCEPTION">
<code class="descclassname">Tkinter.</code><code class="descname">EXCEPTION</code><a class="headerlink" href="#Tkinter.EXCEPTION" title="Permalink to this definition">¶</a></dt>
<dd><p>Constants used in the <em>mask</em> arguments.</p>
</dd></dl>
</div>
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<li><a class="reference internal" href="#">24.1. <code class="docutils literal notranslate"><span class="pre">Tkinter</span></code> — Python interface to Tcl/Tk</a><ul>
<li><a class="reference internal" href="#tkinter-modules">24.1.1. Tkinter Modules</a></li>
<li><a class="reference internal" href="#tkinter-life-preserver">24.1.2. Tkinter Life Preserver</a><ul>
<li><a class="reference internal" href="#how-to-use-this-section">24.1.2.1. How To Use This Section</a></li>
<li><a class="reference internal" href="#a-simple-hello-world-program">24.1.2.2. A Simple Hello World Program</a></li>
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<li><a class="reference internal" href="#a-very-quick-look-at-tcl-tk">24.1.3. A (Very) Quick Look at Tcl/Tk</a></li>
<li><a class="reference internal" href="#mapping-basic-tk-into-tkinter">24.1.4. Mapping Basic Tk into Tkinter</a></li>
<li><a class="reference internal" href="#how-tk-and-tkinter-are-related">24.1.5. How Tk and Tkinter are Related</a></li>
<li><a class="reference internal" href="#handy-reference">24.1.6. Handy Reference</a><ul>
<li><a class="reference internal" href="#setting-options">24.1.6.1. Setting Options</a></li>
<li><a class="reference internal" href="#the-packer">24.1.6.2. The Packer</a></li>
<li><a class="reference internal" href="#packer-options">24.1.6.3. Packer Options</a></li>
<li><a class="reference internal" href="#coupling-widget-variables">24.1.6.4. Coupling Widget Variables</a></li>
<li><a class="reference internal" href="#the-window-manager">24.1.6.5. The Window Manager</a></li>
<li><a class="reference internal" href="#tk-option-data-types">24.1.6.6. Tk Option Data Types</a></li>
<li><a class="reference internal" href="#bindings-and-events">24.1.6.7. Bindings and Events</a></li>
<li><a class="reference internal" href="#the-index-parameter">24.1.6.8. The index Parameter</a></li>
<li><a class="reference internal" href="#images">24.1.6.9. Images</a></li>
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<li><a class="reference internal" href="#file-handlers">24.1.7. File Handlers</a></li>
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