Typos corrected, a blank line added

Also added an ignore to PyCharm
Some maintainers are really strict with PEP 8, so I use it indiscriminately. If I knew that more files used the single comma convention (I could have CTRL+Fed it) I would have never changed it.

If decided, changing ALL the ''' to """ in the project is the way to do such a change. Modifying just one file is nothing but a mess.