[issue18219] csv.DictWriter is slow when writing files with large number of columns

[INADA Naoki]

INADA Naoki added the comment:

LGTM, Thanks Mariatta.
(But one more LGTM from coredev is required for commit)

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nosy: +inada.naoki
versions:  -Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18219>
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