Nick Coghlan added the comment:
For the warnings, it's actually bytes.decode() (et al) that are expected to
return str, and str.encode() that's expected to return bytes. The codecs
themselves remain free to do what they want (hence the recommendation to use
codecs.encode() and codecs.decode() to invoke arbitrary codecs without the type
constraints of the builtins). Aside from that, those 2 warnings and the
unicode.decode() one look good.
However, the "bytes.encode()" warning is the one we determined couldn't be
treated as a warning as "text".encode("ascii") is valid in both Python 2 & 3,
it just does a str->str conversion in 2.x, and a str -> bytes conversion in 3.x.
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<http://bugs.python.org/issue19543>
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