chadrik commented on a change in pull request #12881:
URL: https://github.com/apache/beam/pull/12881#discussion_r491592170
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File path: sdks/python/apache_beam/runners/worker/data_plane.py
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@@ -303,9 +334,10 @@ def inverse(self):
def input_elements(self,
instruction_id, # type: str
- unused_expected_inputs=None, # type: Collection[str]
+ unused_expected_inputs, # type: Any
Review comment:
It's more accurate to say `Any` here, since the method doesn't care.
The argument can't be `Optional` or the method it would be incompatible with
its super type.
I checked all uses of `input_elements` and I did not see any case where it
was called with only one arg.
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