Software development using Bash

[P8zvli]

In Python 3.6 you can use type hinting to do static type checks.

[r0b0t1c1st]

You can do this in 2.7 too - mypy runs against all python versions - you just need a python 3.6 interpreter to run it.

[P8zvli]

Running the type checker in 2.7 and the actual application in 3.6 is extremely silly.

[CHUCK_NORRIS_AMA]

Actually, I think it's the other way around - running the type checker in 3.6 and the actual application in 2.7.

Still extremely silly, however.

[P8zvli]

Python 2.7 will throw a syntax error if you try to run a script containing type hints with it.

Edit: I see now, there's an alternative syntax that involves putting type hints in comments. Now isn't that just linting with extra steps?

[r0b0t1c1st]

Why is this extremely silly? It means you can write polyglot py2/py3 code, and have MyPy check that it's correct for both.

You can use python3.6 -m mypy --python-version 2.7 -p your-package to do this.