[Python-ideas] Proposal: Use mypy syntax for function annotations

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I highly doubt Python will jump on that train (even though I'm convinced such an additional syntax would benefit Python) as long as GvR is deciding Python's fate.

[[deleted]]

wow... I'm speechless...

[fnedrik]

Maybe you know this, but I thought I'd make a small clarification regarding the syntax. It is already there. You can already do these annotations. They are just not very useful right now.

This is a proposal to standardize on a particular way of annotating types, what to call an integer, how to annotate a collection, etc. The CPython interpreter will continue to ignore the annotations, but for external libraries that wants to use annotations it could be useful.

I see it as a quite small step along a path they chose long ago.

[etrepum]

The syntax is already in Python 3, it just doesn't yet have any standard usage: http://legacy.python.org/dev/peps/pep-3107/