(py-in-literal, py-fast-in-literal): New functions (mostly) stolen from CC Mode.
(py-in-literal, py-fast-in-literal): New functions (mostly) stolen
from CC Mode.

(py-guess-indent-offset): Teach it about colons in `literals'
(e.g. comments and strings).  Don't false hit colons in literals; keep
searching for a real block introducing line.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator