Lennart Regebro <rege...@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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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue10954>
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