New submission from Ruslan Dautkhanov <dautkha...@gmail.com>: Reported originally here - https://twitter.com/__zero323__/status/1210911632953692162
See details here https://asciinema.org/a/290643 In [4]: class Foo: pass In [5]: %timeit -n1_000_000 Foo() 88.5 ns ± 3.44 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each) In [6]: T = TypeVar("T") In [7]: class Bar(Generic[T]): pass In [8]: %timeit -n1_000_000 Bar() 883 ns ± 3.46 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each) Same effect in Python 3.6 and 3.8 ---------- messages: 359049 nosy: Ruslan Dautkhanov priority: normal severity: normal status: open title: Generic type subscription is a huge toll on Python performance type: performance versions: Python 3.6, Python 3.7, Python 3.8 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue39168> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
