nehsyc commented on pull request #13493:
URL: https://github.com/apache/beam/pull/13493#issuecomment-742102323
@udim
hmm seems like python 3.6 failed and complained about
```
File
"/home/runner/work/beam/beam/sdks/python/target/.tox/py36/lib/python3.6/site-packages/apache_beam/transforms/util.py",
line 803, in GroupIntoBatches
ShardedKeyType[typehints.TypeVariable(K)], # type: ignore[misc]
TypeError: 'type' object is not subscriptable
```
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