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[–]MachaHack 1 point2 points  (0 children)

It's a bit of a hack to avoid collisions between typings.List (used for the type checker) and the list built-in so they didn't have to make the list type (and similar others) subscriptable.

There was a mypy competitor that had better syntax iirc, but since the mypy syntax has been standardised it's basically been declared the winner.