repopick: Address PEP8 warnings regarding indentations and variable naming

- Format variables into snake case
- Add spacing between # and text
- Space after ','
- Test for membership with "not in" instead
- Remove too many empty lines

Ref:
[0]: https://www.python.org/dev/peps/pep-0008/#function-and-variable-names
[1]: https://www.python.org/dev/peps/pep-0008/#block-comments
[2]: http://pep8online.com/



Signed-off-by: Aayush Gupta <aayushgupta219@gmail.com>
Change-Id: I16dedf465674056571782921983eb3ec4276a1f8