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: