From: Serhiy Storchaka <storchaka@gmail.com>
Date: Sat, 16 Mar 2013 20:53:48 +0000 (+0200)
Subject: Issue #16564: Fixed a performance regression relative to Python 3.1 in the
X-Git-Tag: v3.3.1rc1~42
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=969ff726420b108ba98d4616ec3e99a24ea5776a;p=python

Issue #16564: Fixed a performance regression relative to Python 3.1 in the
caching of compiled regular expressions.
---

969ff726420b108ba98d4616ec3e99a24ea5776a
diff --cc Lib/re.py
index 952b60f45b,b9106061c8..fcea190d33
--- a/Lib/re.py
+++ b/Lib/re.py
@@@ -259,11 -257,19 +259,18 @@@ def escape(pattern)
  # --------------------------------------------------------------------
  # internals
  
+ _cache = {}
+ _cache_repl = {}
+ 
  _pattern_type = type(sre_compile.compile("", 0))
  
- @functools.lru_cache(maxsize=512, typed=True)
+ _MAXCACHE = 512
 -
  def _compile(pattern, flags):
      # internal: compile pattern
+     try:
+         return _cache[type(pattern), pattern, flags]
+     except KeyError:
+         pass
      if isinstance(pattern, _pattern_type):
          if flags:
              raise ValueError(