ComboBox not present in TK
<p>According to the docs there should be a <code>ComboBox</code> operation in TK, but I can't find it. <code>dir(tk)</code> shows</p>

<blockquote>
  <p>['ACTIVE', 'ALL', 'ANCHOR', 'ARC', 'At', 'AtEnd', 'AtInsert', 'AtSelFirst', 'AtSelLast', 'BASELINE', 'BEVEL', 'BOTH', 'BOTTOM', 'BROWSE', 'BUTT', 'BaseWidget', 'BitmapImage', 'BooleanType', 'BooleanVar', 'BufferType', 'BuiltinFunctionType', 'BuiltinMethodType', 'Button', 'CASCADE', 'CENTER', 'CHAR', 'CHECKBUTTON', 'CHORD', 'COMMAND', 'CURRENT', 'CallWrapper', 'Canvas', 'Checkbutton', 'ClassType', 'CodeType', 'ComplexType', 'DISABLED', ...</p>
</blockquote>

<p>The version is</p>

<pre><code>import Tkinter as tk
tk.__version__
</code></pre>

<blockquote>
  <p>'$Revision: 81008 $'</p>
</blockquote>

<p>on my Mac (latest OS X 10.11.6). No brewery for python whatsoever. </p>

<p>There is no <code>ComboBox</code> widget in <code>tkinter</code>, what you are looking for is <code>tkinter.ttk</code> (in Python 3, in Python 2 it's just called <code>ttk</code>), which provides themed tk widgets. <a href="https://docs.python.org/3.1/library/tkinter.ttk.html" rel="nofollow">Docs for <code>tkinter.ttk</code></a>, and <a href="https://docs.python.org/3.1/library/tkinter.ttk.html#tkinter.ttk.Combobox" rel="nofollow">subsection for ComboBox</a>.</p>

<p>You can use this code to import ttk and use its widgets rather than standard <code>tkinter</code> ones:</p>

<p>Python 2</p>

<pre><code>from Tkinter import *
from ttk import *
</code></pre>

<p>Python 3:</p>

<pre><code>from tkinter import *
from tkinter.ttk import *
</code></pre>

python tkinter combobox