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https://issues.apache.org/jira/browse/BEAM-6985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16822368#comment-16822368
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niklas Hansson commented on BEAM-6985:
--------------------------------------
In native_type_compatibility.py row 154,
```matched_entry = next((entry for entry in type_map if entry.match(typ)),
None)```
Don't match and this section returns the default, don't convert to beam_type.
```
if not matched_entry:
# No match: return original type.
return typ
```
Could be the problem and will continue to investigate this.
> 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
>
> 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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