[bug] Syntax error in app.py

[1ExplosiveTaco]

Running app.py in the terminal gives me this:
File "app.py", line 10
whitelist: List[str] = None
^
SyntaxError: invalid syntax
I might have done something wrong? using python 3 and following the read me directions. Thanks

[PetterKraabol]

Hi, I get the same error if I run this in Python 2.7. You might have to use python3 app.py if you have multiple versions installed.

Run python --version to see your version.

It's valid Python 3 syntax: https://repl.it/repls/ShadyDarkcyanComet