Try this code:

# foo.py
import sys, codecs
stream = codecs.getwriter('utf-8')(sys.stdout)
print stream.encoding

$ python foo.py | cat
None

I expected the `encoding' attribute to be "UTF-8", since the stream
otherwise correctly functions as a utf-8 encoding stream.

Is this a bug in the stream factory returned by codecs.getwriter(...)?

If not, is there another way to determine a stream's output encoding
that would work for both default and codecs-created streams?
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