Implement __iter__ in Python RepeatedScalarContainer

[erik-hasse]

What language does this apply to? Python

Describe the problem you are trying to solve. The __iter__ attribute is commonly used to check whether an object is list-like, so neglecting to include it can cause issues, for example this bug in pandas: pandas-dev/pandas#42549. This results in weird behavior where list(obj) works fine even though hasattr(obj, '__iter__') is False.

Describe the solution you'd like The Python RepeatedScalarContainer should implement tp_iter in addition to tp_as_sequence.

Describe alternatives you've considered Manually convert to a list every time we use RepeatedScalarContainer (list(obj)).

[barshaul]

@zhangskz Are there any updates on this?

[caneff]

Ping on this.

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[caneff]

This is still a problem, and internally at Google we still have to patch Pandas in order to make it work with proto repeated fields. Any updates as to fixing this?

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