robertwb commented on a change in pull request #13004:
URL: https://github.com/apache/beam/pull/13004#discussion_r505698385
##########
File path: sdks/python/apache_beam/transforms/core.py
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@@ -2394,8 +2399,8 @@ class GroupBy(PTransform):
"""
def __init__(
self,
- *fields, # type: typing.Union[str, callable]
- **kwargs # type: typing.Union[str, callable]
+ *fields, # type: typing.Union[str, typing.Callable]
Review comment:
Oh, yes, of course. callable is a function returning whether its
argument is callable.
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