or, if the OP happens to be on Windows, findstr will do the same thing: 
findstr /c:"genman.py" C:\python.py

findstr /v /c:"genman.py" C:\python.py

[download]

In reply to Re^2: How to find that a line "genman.py" exists in a python file by ramlight
in thread How to find that a line "genman.py" exists in a python file by Anonymous Monk

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