[issue30365] Backport warnings in ElementTree/cElementTree modules and fix bugs

[Serhiy Storchaka]

Serhiy Storchaka added the comment:


New changeset 09b52471f39ba280d836b945d47719c697af0b45 by Serhiy Storchaka in branch '2.7':
bpo-30365: Backport warnings and fix bugs in ElementTree. (#1581)
https://github.com/python/cpython/commit/09b52471f39ba280d836b945d47719c697af0b45


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