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Issue #18219: Optimize csv.DictWriter for large number of columns.

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Patch by Mariatta Wijaya.
This commit is contained in:
INADA Naoki 2016-10-21 19:47:57 +09:00
parent 4510e6de9d
commit 0a421a28f8
4 changed files with 28 additions and 5 deletions
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2
Lib/csv.py
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@ -145,7 +145,7 @@ class DictWriter:
def _dict_to_list(self, rowdict):
if self.extrasaction == "raise":
wrong_fields = [k for k in rowdict if k not in self.fieldnames]
wrong_fields = rowdict.keys() - self.fieldnames
if wrong_fields:
raise ValueError("dict contains fields not in fieldnames: "
+ ", ".join([repr(x) for x in wrong_fields]))