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https://issues.apache.org/jira/browse/BEAM-6985?focusedWorklogId=239532&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-239532
 ]

ASF GitHub Bot logged work on BEAM-6985:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 09/May/19 00:22
            Start Date: 09/May/19 00:22
    Worklog Time Spent: 10m 
      Work Description: tvalentyn commented on pull request #8453: [BEAM-6985] 
TypeHints Py3 Error: Native type compatibility tests fail on Python 3.7+ Updates
URL: https://github.com/apache/beam/pull/8453#discussion_r282299000
 
 

 ##########
 File path: sdks/python/apache_beam/typehints/native_type_compatibility_test.py
 ##########
 @@ -103,6 +98,64 @@ def test_convert_to_beam_types(self):
         native_type_compatibility.convert_to_beam_types(typing_types),
         beam_types)
 
+  def test_is_sub_class(self):
+    self.assertTrue(native_type_compatibility._safe_issubclass(
+        parent=typing.Dict,
+        derived=typing.Dict[bytes, int]))
+    self.assertFalse(native_type_compatibility._safe_issubclass(
+        parent=typing.List,
+        derived=typing.Dict[bytes, int]))
+    self.assertTrue(native_type_compatibility._safe_issubclass(
+        parent=typing.List,
+        derived=typing.List[bytes]))
+    self.assertFalse(native_type_compatibility._safe_issubclass(
 
 Review comment:
   This is a duplicate of line 105.
   Also, it is sufficient to focus on different classes of usecases for the 
function. 
   For example between
   ```
       self.assertTrue(native_type_compatibility._safe_issubclass(
           parent=typing.Set,
           derived=typing.Set[int]))
   ```
   and
   ```
       self.assertTrue(native_type_compatibility._safe_issubclass(
           parent=typing.Tuple,
           derived=typing.Tuple[int]))
   ```
   I would keep only one scenario.
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 239532)
    Time Spent: 3h 10m  (was: 3h)

> TypeHints Py3 Error: Native type compatibility tests fail on Python 3.7+
> ------------------------------------------------------------------------
>
>                 Key: BEAM-6985
>                 URL: https://issues.apache.org/jira/browse/BEAM-6985
>             Project: Beam
>          Issue Type: Sub-task
>          Components: sdk-py-core
>            Reporter: Robbe
>            Assignee: niklas Hansson
>            Priority: Major
>          Time Spent: 3h 10m
>  Remaining Estimate: 0h
>
> The following tests are failing:
> * test_convert_nested_to_beam_type 
> (apache_beam.typehints.native_type_compatibility_test.NativeTypeCompatibilityTest)
>  
> * test_convert_to_beam_type 
> (apache_beam.typehints.native_type_compatibility_test.NativeTypeCompatibilityTest)
>  
> * test_convert_to_beam_types 
> (apache_beam.typehints.native_type_compatibility_test.NativeTypeCompatibilityTest)
> With similar errors, where `typing.<Type> != <Type>`. eg:
> {noformat}
>  FAIL: test_convert_to_beam_type 
> (apache_beam.typehints.native_type_compatibility_test.NativeTypeCompatibilityTest)
>  ----------------------------------------------------------------------
>  Traceback (most recent call last):
>  File 
> "/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_Commit/src/sdks/python/test-suites/tox/py37/build/srcs/sdks/python/apache_beam/typehints/native_type_compatibility_test.py",
>  line 79, in test_convert_to_beam_type
>  beam_type, description)
>  AssertionError: typing.Dict[bytes, int] != Dict[bytes, int] : simple dict
> {noformat}
>  



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