yilei commented on issue #21593:
URL: https://github.com/apache/beam/issues/21593#issuecomment-1238357657

   Adding a comment from Jira:
   
   > Also: if Iterator is imported from collections.abc instead of typing (to 
annotate process() of DoFn classes), then Beam does not consider it to be 
iterable.
   
   Note typing.Iterator (and other generic collections types) has been 
deprecated since Python 3.9 in favor of collections.abc.


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