New submission from Jelle Zijlstra <jelle.zijls...@gmail.com>:

codecs.StreamRecoder.writelines is implemented as:

    def writelines(self, list):

        data = ''.join(list)
        data, bytesdecoded = self.decode(data, self.errors)
        return self.writer.write(data)

It can't take a list of bytes because then the ''.join throws an error, and it 
can't take a list of str because self.decode takes bytes.

It looks like bytes are intended (self.write takes bytes), so I'll submit a 
simple PR to fix this.

----------
messages: 316465
nosy: Jelle Zijlstra
priority: normal
severity: normal
status: open
title: codecs.StreamRecoder.writelines is broken
versions: Python 3.6, Python 3.7, Python 3.8

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33482>
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