intro/language/basic_types.rst: single pep8 fix
intro/language/basic_types.rst: fix indentation
intro/solutions/pi_wallis.py: PEP8 the whole thing
Merge branch 'gael_suggestsions/intro/language'

* gael_suggestsions/intro/language:
  intro/solutions/pi_wallis.py: PEP8 the whole thing
  intro/language/basic_types.rst: fix indentation
  intro/language/basic_types.rst: single pep8 fix