[issue17828] More informative error handling when encoding and decoding

[Nick Coghlan]

Nick Coghlan added the comment:

The other thing is that this patch doesn't wrap AttributeError. I'm OK with that, since I believe the only codec in the standard library that currently throws that for a bad input type is rot_13.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17828>
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