Typing `NoReturn` requires Python 3.5.4

Describe the bug Attempting to run PRAW 6.5.0 under <Python 3.5.4 (I’m using 3.5.1) will result in:

https://docs.python.org/3/library/typing.html#typing.NoReturn

Traceback (most recent call last):
  File "F:\testing_routine.py", line 11, in <module>
    import praw
  File "C:\Users\USERNAME\AppData\Local\Programs\Python\Python35-32\lib\site-packages\praw\__init__.py", line 14, in <module>
    from .reddit import Reddit  # NOQA
  File "C:\Users\USERNAME\AppData\Local\Programs\Python\Python35-32\lib\site-packages\praw\reddit.py", line 5, in <module>
    from typing import (
ImportError: cannot import name 'NoReturn'

Typing NoReturn was only introduced in 3.5.4 of Python, and PRAW allows for installation on 3.5.0 <= version ❤️.5.4 (3.5.0, 1, 2, 3) versions so users with these versions are going to encounter this. And this will be an issue unless a minimum version of 3.5.4 is set.

This was also introduced in 3.6.2, so I believe the versions 3.6.0 and 3.6.1 are also invalid.

TBH I may be a noob but I don’t understand why the typing additions were made in #1184.

To Reproduce Steps to reproduce the behavior:

1. Run any script using PRAW on a version of Python 3.5 that’s below 3.5.4.

System Info

• OS: Windows 10 Pro
• Python: 3.5.1
• PRAW Version: 6.5.0

[jarhill0]

For what it’s worth, I happened to have an unsupported 3.6 version a week or two ago when I tried to run a different PR that used NoReturn. I upgraded my python version since then, but I don’t think we should expect people to upgrade their python version to use our library.

[bboe]

Absolutely.