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http://python.org/dev/peps/pep-0008/ " Comparisons to singletons like None...
jimpp
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http://python.org/dev/peps/pep-0008/ " Comparisons to singletons like None should always be done with 'is' or 'is not', never the equality operators." Comparisons to None part; second one... roster_win.py is NOT checked here (waiting for modelfilter)