hello! I am a novice looking up to the tutor as my Guide. I got a problem while using optional parameter.
#! user/bin/env python import os def myfiles(directory,extension=None): for x in [os.path.join(x,i) for x,y,z in os.walk(directory)\ for i in z if i.endswith(extension)]:print x if __name__=='__main__': import sys myfiles(sys.argv[1],sys.argv[2]) >>> myfiles.myfiles('C:\\python26') Traceback (most recent call last): File "<pyshell#17>", line 1, in <module> myfiles.myfiles('C:\\python26') File "C:\Python26\lib\site-packages\myfiles.py", line 6, in myfiles for i in z if i.endswith(extension)]:print x TypeError: expected a character buffer object >>> myfiles.myfiles('C:\\python26','doc') C:\python26\Doc\examples.doc How can I rectify this? Thanks Prasad
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