I got a following error when trying plot() function in NLTK. >>> fdist.plot(cumulative=True) Exception in Tkinter callback Traceback (most recent call last): File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/Tkin…

It was not convenient to move to the directlry under C:\Python27\Scrpits every time I start to use Python and NLTK in my Windows 7 environment. Now I learnt how to set the PATH as an enverionment variable.1. Right click My Computer icon th…