gh-137855: Improve import time of textwrap by lazy importing re modules - #150156
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XiaoWan-zi wants to merge 1 commit into
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gh-137855: Improve import time of textwrap by lazy importing re modules#150156XiaoWan-zi wants to merge 1 commit into
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May 20, 2026
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This is a nontrivial change that may break subclasses so closing, sorry.
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Summary
textwrapimport time by lazy-importingre(PEP 810) instead of loading it at module import.TextWrapperword-separator regexes from class body to_compile_wordseps(), called on firstTextWrapper()instantiation. Compiled patterns remain class attributes, shared across instances (same semantics as before).LazyImportTest.test_lazy_importusingensure_lazy_imports()to guard against regressions.Part of the ongoing stdlib import-time work tracked in Improve import time of various stdlib modules #137855.
Motivation
textwrapis imported eagerly by many modules (e.g. tests,traceback,optparsepaths) often only fordedent()/indent(), which do not needre. Previously,import reat module level andre.compile()in theTextWrapperclass body causedreto load on everyimport textwrap.Before
After