Cheaking an directory source code python

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The os module is to help you deal with any operation dealing with the directory.

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1. import os
2.
3. # todo check for existing file.
4. if os .path.isfile ('./gradebook.dat' ): # check to see if file exists
5. data = open( './gradebook.dat' , 'rb' ) # if file exists open, read all d
6. data.close ()
7. else:
8. print ("The file gradebook.dat was not found.\n" )
9. print ("We will create one....\n" )

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