sys.stdout.encoding gives this error.
Also sys.stdin.encoding gives 'UTF8', while python gives 'UTF-8' for both cases.

This commit makes bpython work (naturally stdin is still different than in standard python):

bpython version 0.15 on top of Python 3.5.2 /usr/bin/python
>>> import sys
>>> sys.stdin.encoding
'UTF8'
>>> sys.stdout.encoding
'UTF-8'