Paul Ganssle <p.gans...@gmail.com> added the comment:
@Serhiy I like the "convert to a tuple" idea before returning *better*, though
I think I'd prefer to just check that it's tuple-like, something like:
if not all(hasattr(return_val, attr) for attr in ['__getitem__',
'__len__']) or len(return_val) != 2:
warnings.warn("divmod must return a Sequence of length 2. " +
"This will be an exception in Python 3.9+",
Deprecationwarning)
Or some similar equivalent to `if not isinstance(return_val,
collections.abc.Sequence) or len(return_val) != 2`.
That said, the PR seems to have already run into an issue, which is that
`unittest.mock.MagicMock` returns a `unittest.mock.MagicMock` from `divmod`,
which is not a 2-tuple.
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<https://bugs.python.org/issue34676>
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