Ismaël Mejía created BEAM-7757:
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             Summary: Tagging python transform as experimental breaks tests
                 Key: BEAM-7757
                 URL: https://issues.apache.org/jira/browse/BEAM-7757
             Project: Beam
          Issue Type: Bug
          Components: sdk-py-core
            Reporter: Ismaël Mejía


As part of BEAM-7715 I tried to add the `@experimental()` annotation in the 
external.py `External` and generate_sequence transform too. However it broke 
the tests apparently on a typing issue related to the annotation.
*15:53:42*   File 
"/home/jenkins/jenkins-slave/workspace/beam_PreCommit_Python_PVR_Flink_Commit/src/sdks/python/apache_beam/runners/portability/flink_runner_test.py",
 line 172, in test_external_transforms*15:53:42*     
expansion_service=get_expansion_service()))*15:53:42*   File 
"apache_beam/utils/annotations.py", line 146, in inner*15:53:42*     return 
fnc(*args, **kwargs)*15:53:42*   File 
"apache_beam/io/external/generate_sequence.py", line 56, in __init__*15:53:42*  
   super(GenerateSequence, self).__init__()*15:53:42* TypeError: super() 
argument 1 must be type, not functionRef.
Ref.
https://builds.apache.org/job/beam_PreCommit_Python_PVR_Flink_Commit/3794/console



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