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gh-156363: Speed up import of rlcompleter by deferring inspect and re by maxday · Pull Request #156364 · python/cpython · GitHub

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gh-156363: Speed up import of rlcompleter by deferring inspect and re #156364

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gh-156363: Speed up import of rlcompleter by deferring inspect and re #156364

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gh-156363: Speed up import of rlcompleter by deferring inspect and re
maxday Aug 25, 2026
0ba9e10
gh-156363: Use PEP 810 lazy imports for inspect and re in rlcompleter
maxday Aug 25, 2026
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5 changes: 3 additions & 2 deletions Lib/rlcompleter.py
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Expand Up @@ -31,13 +31,14 @@

import atexit
import builtins
import inspect
import keyword
import re
import __main__
import warnings
import types

StanFromIreland Aug 25, 2026

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality
Suggested change

lazy imports shouldn't be separate.
lazy import inspect
lazy import re

__all__ = ["Completer"]

# Sentinel object to distinguish "missing" from "present but None"
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5 changes: 5 additions & 0 deletions Lib/test/test_rlcompleter.py
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Expand Up @@ -4,6 +4,7 @@
import types
import rlcompleter
from test.support import MISSING_C_DOCSTRINGS
from test.support.import_helper import ensure_lazy_imports

class CompleteMe:
""" Trivial class used in testing rlcompleter.Completer. """
Expand Down Expand Up @@ -252,5 +253,9 @@ def test_duplicate_globals(self):
self.assertEqual(completer.complete('Ellipsis', 0), 'Ellipsis()')
self.assertIsNone(completer.complete('Ellipsis', 1))

def test_lazy_imports(self):
ensure_lazy_imports("rlcompleter", {"inspect", "re"})


if __name__ == '__main__':
unittest.main()
5 changes: 5 additions & 0 deletions Misc/NEWS.d/next/Library/2026-08-25-12-43-10.gh-issue-156363.RlzImp.rst
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@@ -0,0 +1,5 @@
Speed up ``import rlcompleter`` by deferring the imports of :mod:`inspect`
and :mod:`re` into the completion methods that use them. They are only
needed while computing completions, so importing :mod:`rlcompleter` (for
example when setting up interactive completion) no longer pays their import
cost.
Comment on lines +1 to +5

StanFromIreland Aug 25, 2026

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality
Suggested change
Speed up ``import rlcompleter`` by deferring the imports of :mod:`inspect`
and :mod:`re` into the completion methods that use them. They are only
needed while computing completions, so importing :mod:`rlcompleter` (for
example when setting up interactive completion) no longer pays their import
cost.
Speed up the :mod:`rlcompleter` module's import time.

The rest is implementation details.
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