https://github.com/python/cpython/commit/cf5e438c0297954c4411c1c3ae4ba67a48b134ea
commit: cf5e438c0297954c4411c1c3ae4ba67a48b134ea
branch: main
author: Semyon Moroz <[email protected]>
committer: hugovk <[email protected]>
date: 2025-03-27T15:47:08+02:00
summary:
gh-118761: Always lazy import `re` in `locale` (#129860)
files:
A Misc/NEWS.d/next/Library/2025-02-08-21-37-05.gh-issue-118761.EtqxeB.rst
M Lib/locale.py
diff --git a/Lib/locale.py b/Lib/locale.py
index 213d5e93418cfb..2feb10e59c96a3 100644
--- a/Lib/locale.py
+++ b/Lib/locale.py
@@ -13,7 +13,6 @@
import sys
import encodings
import encodings.aliases
-import re
import _collections_abc
from builtins import str as _builtin_str
import functools
@@ -177,8 +176,7 @@ def _strip_padding(s, amount):
amount -= 1
return s[lpos:rpos+1]
-_percent_re = re.compile(r'%(?:\((?P<key>.*?)\))?'
- r'(?P<modifiers>[-#0-9 +*.hlL]*?)[eEfFgGdiouxXcrs%]')
+_percent_re = None
def _format(percent, value, grouping=False, monetary=False, *additional):
if additional:
@@ -217,6 +215,13 @@ def format_string(f, val, grouping=False, monetary=False):
Grouping is applied if the third parameter is true.
Conversion uses monetary thousands separator and grouping strings if
forth parameter monetary is true."""
+ global _percent_re
+ if _percent_re is None:
+ import re
+
+ _percent_re = re.compile(r'%(?:\((?P<key>.*?)\))?(?P<modifiers'
+ r'>[-#0-9 +*.hlL]*?)[eEfFgGdiouxXcrs%]')
+
percents = list(_percent_re.finditer(f))
new_f = _percent_re.sub('%s', f)
diff --git
a/Misc/NEWS.d/next/Library/2025-02-08-21-37-05.gh-issue-118761.EtqxeB.rst
b/Misc/NEWS.d/next/Library/2025-02-08-21-37-05.gh-issue-118761.EtqxeB.rst
new file mode 100644
index 00000000000000..b35275b321b4b2
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-02-08-21-37-05.gh-issue-118761.EtqxeB.rst
@@ -0,0 +1,2 @@
+Improve import time of :mod:`locale` using lazy import ``re``. Patch by
+Semyon Moroz.
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