[issue10954] No warning for csv.writer API change

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

Newline='' is indeed needed. It preserves the newlines so that the csv module can correctly parse them according to the weird csv quoting roles.  And for output, the fact that it isn't documented there is a an issue that was only noticed recently.

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nosy: +r.david.murray

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<http://bugs.python.org/issue10954>
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