Martin Panter added the comment:
I think calling iterencode() with an empty iterator is a side issue. Even with
a non-empty iterator, it tries to encode an empty _text_ string to finalise the
encoder:
>>> bytes().join(codecs.iterencode(iter((b"data",)), "base64-codec"))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python3.3/codecs.py", line 1014, in iterencode
output = encoder.encode("", True)
File "/usr/lib/python3.3/encodings/base64_codec.py", line 31, in encode
return base64.encodebytes(input)
File "/usr/lib/python3.3/base64.py", line 343, in encodebytes
raise TypeError("expected bytes, not %s" % s.__class__.__name__)
TypeError: expected bytes, not str
Similarly, iterdecode(encoding="rot-13") doesn’t work. I agree it would be good
to document that iterencode() is limited to text encoders and iterdecode() is
limited to byte decoders.
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<http://bugs.python.org/issue20132>
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