clean-up: fix PEP8 W602 deprecated form of raising exception

clean-up: fix PEP8 E502 the backslash is redundant between brackets

clean-up: fix PEP8 W601 .has_key() is deprecated, use 'in'

clean-up: fix PEP8 E731 do not assign a lambda expression, use a def

clean-up: fix PEP8 E203 whitespace before ','

clean-up: fix PEP8 E262 inline comment should start with '# '

clean-up: fix PEP8 E712 comparison to True should be 'if cond is True:' or 'if cond:'

clean-up: fix PEP8 E222 multiple spaces after operator

clean-up: fix PEP8 E111 indentation is not a multiple of four

clean-up: fix PEP8 E701 multiple statements on one line (colon)

clean-up: fix PEP8 E741 ambiguous variable name

clean-up: fix most PEP8 E221 multiple spaces before operator

clean-up: fix most PEP8 E266 too many leading '#' for block comment

clean-up: fix PEP8 E703 statement ends with a semicolon