[issue27497] csv module: Add return value to DictWriter.writeheader

[Zachary Ware]

Zachary Ware added the comment:

This seems like a reasonable request, but could only be done in 3.6 as it would be a new feature.

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keywords: +easy
nosy: +zach.ware
stage:  -> needs patch
versions:  -Python 3.5

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