IOError: [Errno 22] invalid mode (‘r’) or filename: ‘c:\\Python27\test.txt’ [duplicate]

by

\t is a tab character. Use a raw string instead:

test_file=open(r'c:\Python27\test.txt','r')

or double the slashes:

test_file=open('c:\\Python27\\test.txt','r')

or use forward slashes instead:

test_file=open('c:/Python27/test.txt','r')

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