8000 gh-118761: Optimise import time for ``string`` by AA-Turner · Pull Request #132037 · python/cpython · GitHub
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Merged
merged 6 commits into from
Apr 8, 2025
Merged

gh-118761: Optimise import time for string #132037

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ec78492
Optimise import time for ``string``
AA-Turner Apr 3, 2025
2b542c7
Refactor to a common classmethod
AA-Turner Apr 3, 2025
e28e43f
Add comment
AA-Turner Apr 3, 2025
056dd07
Use None as the sentinel
AA-Turner Apr 6, 2025
bb3605a
Make _TemplatePattern a singleton
AA-Turner Apr 7, 2025
6fb9b5d
Serhiy's suggestion
AA-Turner Apr 8, 2025
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Make _TemplatePattern a singleton
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@AA-Turner
AA-Turner committed Apr 7, 2025
commit bb3605a7d89acb288cabdf5e29dffc11b2567251
7 changes: 4 additions & 3 deletions Lib/string.py
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Original file line number Diff line number Diff line change
Expand Up @@ -53,11 +53,12 @@ def capwords(s, sep=None):


class _TemplatePattern:
# This descriptor is overwritten in ``Template._compile_pattern()``.
def __get__(self, instance, cls=None):
if cls is None:
return self
# This descriptor is overwritten in ``_compile_pattern()``.
return cls._compile_pattern()
_TemplatePattern = _TemplatePattern()


class Template:
Expand All @@ -72,7 +73,7 @@ class Template:
braceidpattern = None
flags = None # default: re.IGNORECASE

pattern = _TemplatePattern() # use a descriptor to compile the pattern
pattern = _TemplatePattern # use a descriptor to compile the pattern

def __init_subclass__(cls):
super().__init_subclass__()
Expand All @@ -83,7 +84,7 @@ def _compile_pattern(cls):
import re # deferred import, for performance

cls_pattern = cls.__dict__.get('pattern')
if cls_pattern and not isinstance(cls_pattern, _TemplatePattern):
if cls_pattern is not None and cls_pattern is not _TemplatePattern:
# Prefer a pattern defined on the class.
pattern = cls_pattern
else:
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