[issue10954] No warning for csv.writer API change

[Lennart Regebro]

Lennart Regebro <regebro at gmail.com> added the comment:

In the worst case, not checking for newline='' is not a big problem, as anyone moving from Python 2 to Python 3 will open the file in binary mode. That error message could tell the user to use binary mode newlines=''.

Using textmode and newlines is only likely to happen with people writing new code for Python 3 and not reading the docs, which is a different problem. :-)

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