PEP 8 fixes for mypy
PEP 8 fixes for bottles.py
PEP 8 fixes for class.py
PEP 8 fix for cmdline.py
PEP 8 fixes for example.py
PEP 8 fix for files.py
PEP 8 fixes for generators.py
PEP 8 fix for greet.py
PEP 8 fix for guess.py
Merge pull request #419 from ivuk/pep8-fixes-6

PEP 8 fixes