udim commented on pull request #15850:
URL: https://github.com/apache/beam/pull/15850#issuecomment-956384234
> Hi, thanks for the contribution!
>
> I think you need `from collections.abc import Sequence`, at least for
Python 3.8:
>
> ```
> >>> import collections
> >>> collections.abc.Sequence
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File
"/usr/local/google/home/ehudm/.pyenv/versions/3.8.12/lib/python3.8/collections/__init__.py",
line 55, in __getattr__
> raise AttributeError(f'module {__name__!r} has no attribute {name!r}')
> AttributeError: module 'collections' has no attribute 'abc'
> ```
Or maybe: `import collections.abc`. Honestly, I'm not sure how the existing
code works with `collections.abc.Iterable`.
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