René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Performance of attribute lookup for module objects","articleBody":"# Feature or enhancement\r\n\r\nSimilar to gh-92216 (for type objects) - attribute lookup on module objects for non-existing attributes is significantly slower compared to existing attributes, as well as non-existing attributes on types and instances.\r\n\r\nmicrobenchmark on main:\r\n\r\n```\r\npython -m pyperf timeit -s 'import os' 'hasattr(os, \"getenv\")'\r\n.....................\r\nMean +- std dev: 37.8 ns +- 1.5 ns\r\n```\r\n\r\n```\r\npython -m pyperf timeit -s 'import os' 'hasattr(os, \"nothing\")'\r\n.....................\r\nMean +- std dev: 541 ns +- 16 ns\r\n```\r\n\r\nAs in gh-92216, the reason for the slowness is time spent in creating an `AttributeError`, which is not needed.\r\nBy adding a special case for modules (similar to the type special case in gh-99979), this overhead can be eliminated.\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-104063\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/itamaro","@type":"Person","name":"itamaro"},"datePublished":"2023-05-01T21:45:32.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/104066/cpython/issues/104066"}