robertwb commented on a change in pull request #11838:
URL: https://github.com/apache/beam/pull/11838#discussion_r437787906
##########
File path: sdks/python/apache_beam/testing/test_stream.py
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@@ -291,10 +291,10 @@ def expand(self, pbegin):
assert isinstance(pbegin, pvalue.PBegin)
self.pipeline = pbegin.pipeline
if not self.output_tags:
- self.output_tags = set([None])
+ self.output_tags = {None}
Review comment:
OK, in that case I'm fine with this.
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