robertwb commented on a change in pull request #11632:
URL: https://github.com/apache/beam/pull/11632#discussion_r421871772



##########
File path: sdks/python/apache_beam/dataframe/convert.py
##########
@@ -16,13 +16,23 @@
 
 from __future__ import absolute_import
 
+import typing
+
 import inspect
 
 from apache_beam import pvalue
 from apache_beam.dataframe import expressions
 from apache_beam.dataframe import frame_base
 from apache_beam.dataframe import transforms
 
+if typing.TYPE_CHECKING:
+  # pylint: disable=ungrouped-imports
+  from typing import Any
+  from typing import Dict
+  from typing import Tuple
+  from typing import Union

Review comment:
       I actually prefer unconditionally importing them, but was just trying to 
avoid lint issues (and did see this pattern elsewhere). Changed. 




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