[issue15811] ElementTree.write() raises TypeError when xml_declaration = True and encoding is a unicode string

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

Why is it a problem? Encoding must be a text string:
  encoding='utf-8'
works with both Python 2 and 3.

Or if you used "from __future__ import unicode_literals",
    str('utf-8')
works as well.

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nosy: +amaury.forgeotdarc

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