I've noticed while upgrading our code to v2 that we had big slowdowns within our test suites. And I narrowed it down to our numerous calls to isinstance checks. Turns out that isinstance for a ...

from typing import Union def f(x : Union[int, float]): if isinstance(x, float): print("b", x) elif isinstance(x, int): print("a", x) with --warn-unreachable returns ...

If there’s one thing about Python that’s slightly disconcerting, it’s the complete lack of braces, or as they’re called in American English, suspenders. A feature of every variety of C, Java, PHP, ...

If there’s one thing about Python that’s slightly disconcerting, it’s the complete lack of braces, or as they’re called in American English, suspenders. A feature of every variety of C, Java, PHP, ...