Serhiy Storchaka added the comment:
codecs.open() works with bytes-to-bytes codecs.
>>> f = codecs.open('test1', 'w', encoding='hex_codec')
>>> f.write(b'hello')
>>> f.close()
>>> open('test1', 'rb').read()
b'68656c6c6f'
In additional the interface of StreamReaderWriter is not fully compatible with
the interface of io classes. This would be compatible-breaking change.
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<http://bugs.python.org/issue29783>
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