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bpo-37723: Fix performance regression on regular expression parsing. (GH-15030)
Improve performance of sre_parse._uniq function.
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@ -430,13 +430,7 @@ def _escape(source, escape, state):
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raise source.error("bad escape %s" % escape, len(escape))
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def _uniq(items):
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if len(set(items)) == len(items):
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return items
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newitems = []
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for item in items:
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if item not in newitems:
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newitems.append(item)
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return newitems
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return list(dict.fromkeys(items))
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def _parse_sub(source, state, verbose, nested):
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# parse an alternation: a|b|c
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@ -1708,6 +1708,7 @@ Michael Urman
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Hector Urtubia
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Lukas Vacek
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Ville Vainio
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Yann Vaginay
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Andi Vajda
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Case Van Horsen
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John Mark Vandenberg
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@ -0,0 +1,2 @@
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Fix performance regression on regular expression parsing with huge
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character sets. Patch by Yann Vaginay.
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