Fix newline & white space related style errors

Fixed errors
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* E121: continuation line indentation is not a multiple of four
* E126: continuation line over-indented for hanging indent
* E128: continuation line under-indented for visual indent
* E202: whitespace before ‘)’
* E225: missing whitespace around operator
* E226: missing whitespace around arithmetic operator
* E231: missing whitespace after ‘,’
* E251: unexpected spaces around keyword / parameter equals
* E302: expected 2 blank lines, found 0
* E303: too many blank lines (3)
* W293: blank line contains whitespace