[issue40013] CSV DictReader parameter documentation

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan <tir.karthi at gmail.com> added the comment:

This looks like a good clarification to me where None is clarified that it's the value of restval. DictWriter has a similar doc "The optional restval parameter specifies the value to be written if the dictionary is missing a key in fieldnames" at https://docs.python.org/3/library/csv.html#csv.DictWriter

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nosy: +xtreak

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