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

[STINNER Victor]

STINNER Victor added the comment:

Oh. I missed the django recipe to implement "streaming csv". It uses an
Echo object, its write() method returns its parameter.

This recipe looks like an abuse of the API, but I understand that there is
a need for a kind of "partial write": give control to I/O to the caller.

Maybe we should extend the API?

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<http://bugs.python.org/issue27497>
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