## 16.1.1 Tkinter Modules

Most of the time, the `Tkinter` 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 `_tkinter`. 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.

In addition to the Tk interface module, `Tkinter` includes a number of Python modules. The two most important modules are the `Tkinter` module itself, and a module called `Tkconstants`. The former automatically imports the latter, so to use Tkinter, all you need to do is to import one module:

      import Tkinter

Or, more often:

      from Tkinter import *

class `Tk`(screenName=None, baseName=None, className='Tk')
  The `Tk` class is instantiated without arguments. This creates a toplevel widget of Tk which usually is the main window of an appliation. Each instance has its own associated Tcl interpreter.

Other modules that provide Tk support include:

`ScrolledText`
  Text widget with a vertical scroll bar built in.

`tkColorChooser`
  Dialog to let the user choose a color.

`tkCommonDialog`
  Base class for the dialogs defined in the other modules listed here.

`tkFileDialog`
  Common dialogs to allow the user to specify a file to open or save.

`tkFont`
  Utilities to help work with fonts.

`tkMessageBox`
  Access to standard Tk dialog boxes.

`tkSimpleDialog`
  Basic dialogs and convenience functions.

`Tkdnd`
  Drag-and-drop support for `Tkinter`. This is experimental and should become deprecated when it is replaced with the Tk DND.

`turtle`
  Turtle graphics in a Tk window.