New submission from Gregory P. Smith <g...@krypto.org>:
Creating an enum subclass (ie: defining an enum) is slow. This dramatically impacts startup time of Python programs that import a bunch of potentially needed constant definitions at startup before any proper code executes. How slow? So slow that a module defining a ~300 enums takes nearly 100ms just to import from its pyc file. Example code: https://github.com/googleads/google-ads-python/blob/96fd08bb62435f1930df4871033ba8689333b67f/google/ads/google_ads/v2/services/enums.py We've known this, we should do something about it. (Even if it means implementing the guts of the magic enum machinery in C.) ie, it came up in https://bugs.python.org/issue28637 as a stdlib startup time regression and is likely to come up in similar contexts elsewhere. ---------- components: Library (Lib) messages: 355777 nosy: gregory.p.smith priority: normal severity: normal stage: needs patch status: open title: enum classes cause slow startup time type: performance versions: Python 3.9 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue38659> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
