[issue5455] csv module no longer works as expected when file opened in binary mode

[Skip Montanaro]

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

Jervis> So the returned lineobj is a bytes type and then the
    Jervis> PyUnicode_Check throws the error.

Right, but given that fact how do you get a Unicode string out of the bytes
without an encoding?  You can't open a file in binary mode and give the
encoding arg.

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message_count: 4.0 -> 5.0

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<http://bugs.python.org/issue5455>
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