Fix PEP8: E401 multiple imports on one line
Fix PEP8: E502 the backslash is redundant

between brackets
Fix PEP8: W601 .has_key() is deprecated, use 'in'
Fix PEP8: E711 comparison to None

should be 'if cond is None:'
Fix PEP8: E712 comparison to True

should be 'if cond is True:' or 'if cond:'
Lower PEP8 threshold to 10 violations
Merge pull request #6044 from stvstnfrd/pep8/syntax

Fix syntax-related PEP8 issues