See https://www.python.org/dev/peps/pep-0484/#suggested-syntax-for-python-2-7-and-straddling-code
"Michael R. Crusoe" <crusoe@ucdavis.edu> writes:
> This is a backport of the standard library typing module to Python
> versions older than 3.5.
Not sure what the point of this is; doesn't typing hinting require PEP
3107, which isn't in Python 2.x?
--
Brian May <bam@debian.org>