Nick Coghlan added the comment:
For anyone interested, I have a patch up on issue 17828 that produces the
following output for various codec usage errors:
>>> import codecs
>>> codecs.encode(b"hello", "bz2_codec").decode("bz2_codec")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'bz2_codec' decoder returned 'bytes' instead of 'str'; use
codecs.decode to decode to arbitrary types
>>> "hello".encode("bz2_codec")
TypeError: 'str' does not support the buffer interface
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: invalid input type for 'bz2_codec' codec (TypeError: 'str' does not
support the buffer interface)
>>> "hello".encode("rot_13")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'rot_13' encoder returned 'str' instead of 'bytes'; use
codecs.encode to encode to arbitrary types
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue7475>
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