boyuanzz commented on a change in pull request #13493:
URL: https://github.com/apache/beam/pull/13493#discussion_r537903634
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File path: sdks/python/apache_beam/typehints/sharded_key_type.py
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@@ -25,8 +25,12 @@
from apache_beam.typehints.typehints import match_type_variables
from apache_beam.utils.sharded_key import ShardedKey
+from future.utils import with_metaclass
-class ShardedKeyTypeConstraint(typehints.TypeConstraint):
+
+class ShardedKeyTypeConstraint(with_metaclass(typehints.GetitemConstructor,
Review comment:
What kind of lint errors are you getting?
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