Environment variables when using Tkinter

What to do if you get an error like this because the Tcl / Tk library is not found when you try to use Tkinter in a Windows environment.

    self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: Can't find a usable tk.tcl in the following directories: 
    {C:\Python27\tcl\tk8.5} C:/Python27/tcl/tcl8.5/tk8.5 C:/lib/tk8.5 C:/library

If you specify TCL_LIBRARY and TK_LIBRARY environment variables, it will work. If you have multiple versions of Python or Tcl / Tk and you don't want to mess with environment variables, you can mess with os.environ directly at the beginning of the program.

Sample program

# -*- coding: utf-8 -*-
__author__ = 'Natsutani'

import os
from matplotlib.pyplot import *;

def main():
    #Setting environment variables
    os.environ['TCL_LIBRARY'] = 'C:/Python32/tcl/tcl8.5'
    os.environ['TK_LIBRARY'] = 'C:/Python32/tcl/tk8.5'

    x = (5,11,3,5)
    y = (3,5,3,5)
    scatter(x,y)
    show()

if __name__ == "__main__":
    main()

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