[issue15216] Support setting the encoding on a text stream after creation

[STINNER Victor]

STINNER Victor added the comment:

> My implementation permits to change both (encoding, errors, encoding and errors).

We may also add a set_errors() method:

def set_errors(self, errors):
   self.set_encoding(self.encoding, errors)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15216>
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