Internal Program Version: typing_extensions  4.5.0

The 'typing' module was added to the standard library in Python
3.5 on a provisional basis and will no longer be provisional in
Python 3.7. However, this means users of Python 3.5 - 3.6 who are
unable to upgrade will not be able to take advantage of new types
added to the 'typing' module, such as 'typing.Text' or
'typing.Coroutine'.

The 'typing_extensions' module contains both backports of these
changes as well as experimental types that will eventually be
added to the 'typing' module, such as 'Protocol'.

Users of other Python versions should continue to install and use
the 'typing' module from PyPi instead of using this one unless
specifically writing code that must be compatible with multiple
Python versions or requires experimental types.

https://github.com/python/typing