Refactor: python: Modify docstrings to follow PEP 257.

• The first line of each docstring should end with a period.

• Remove spaces between the docstring and its enclosing triple quotes.

• Remove empty lines between the docstring and the code that comes after it.

• Remove empty lines between "Arguments:" and the list of arguments.

• Multi-line docstrings should start on the line after the triple quotes and all lines should be indented the same amount.

• Add docstrings for methods that were missing one.