[issue1537721] csv module: add header row to DictWriter

[Skip Montanaro]

Skip Montanaro <skip at pobox.com> added the comment:

Antoine> We can't change default behaviour because it will break
    Antoine> compatibility, so an additional method looks ok to me.

Why can't default behavior be changed?

S

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<http://bugs.python.org/issue1537721>
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