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gh-100792: Make email.message.Message.__contains__ twice as fast #100793

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Merged
merged 2 commits into from
Jan 7, 2023
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gh-100792: Make email.message.Message.__contains__ twice as fast #100793

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gh-100792: Make `email.message.Message.__contains__` twice as fast
sobolevn Jan 6, 2023
d2d0c76
Update Misc/NEWS.d/next/Library/2023-01-06-14-05-15.gh-issue-100792.C…
sobolevn Jan 7, 2023
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gh-100792: Make email.message.Message.__contains__ twice as fast
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@sobolevn
sobolevn committed Jan 6, 2023
commit fe612489c044a0e076ac227af60b56fa4c1963e9
6 changes: 5 additions & 1 deletion Lib/email/message.py
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Original file line number Diff line number Diff line change
Expand Up @@ -448,7 +448,11 @@ def __delitem__(self, name):
self._headers = newheaders

def __contains__(self, name):
return name.lower() in [k.lower() for k, v in self._headers]
name_lower = name.lower()
for k, v in self._headers:
if name_lower == k.lower():
return True
return False

def __iter__(self):
for field, value in self._headers:
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2023-01-06-14-05-15.gh-issue-100792.CEOJth.rst
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@@ -0,0 +1 @@
Make ``email.message.Message.__contains__`` twice as fast.