[issue31256] xml.etree.ElementTree: add support for doctype in tostring method

[Danya Sucharik]

Danya Sucharik <sucharik at protonmail.com> added the comment:

May I aks, how it to add a doctype now?

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nosy: +sucharik
versions: +Python 3.8 -Python 3.5

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<https://bugs.python.org/issue31256>
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