* F401 module imported but unused
* E271 multiple spaces after keyword
* E272 multiple spaces before keyword
* E202 remove extraneous whitespace
* E711 comparison to None should be 'if cond is None:'
* E712 comparison to True/False should be 'if cond is True/False:' or 'if cond:'
Change-Id: I56a1dbee2ae17b8315a55215e2c676e0de8311f7