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https://issues.apache.org/jira/browse/BEAM-9755?focusedWorklogId=426200&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-426200
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ASF GitHub Bot logged work on BEAM-9755:
----------------------------------------
Author: ASF GitHub Bot
Created on: 22/Apr/20 15:58
Start Date: 22/Apr/20 15:58
Worklog Time Spent: 10m
Work Description: lazylynx commented on issue #11493:
URL: https://github.com/apache/beam/pull/11493#issuecomment-617868282
R: @udim @tvalentyn
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Issue Time Tracking
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Worklog Id: (was: 426200)
Time Spent: 20m (was: 10m)
> infer_return_type does not infer as expected in Python 3.8
> ----------------------------------------------------------
>
> Key: BEAM-9755
> URL: https://issues.apache.org/jira/browse/BEAM-9755
> Project: Beam
> Issue Type: Sub-task
> Components: sdk-py-core
> Reporter: yoshiki obata
> Assignee: yoshiki obata
> Priority: Major
> Time Spent: 20m
> Remaining Estimate: 0h
>
> apache_beam.typehints.trivial_inference.infer_return_type does not return
> type as expected in Python 3.8.
> And this cause testDictComprehensionSimple
> (apache_beam.typehints.trivial_inference_test.TrivialInferenceTest) FAIL.
> - Python 3.7.7
> {code:python}
> >> from apache_beam.typehints.trivial_inference import infer_return_type
> >> infer_return_type(lambda _list: {'a': 1 for _ in _list}, [], debug=False,
> depth=5)
> Dict[str, int]{code}
> - Python 3.8.2
> {code:python}
> >> from apache_beam.typehints.trivial_inference import infer_return_type
> >> infer_return_type(lambda _list: {'a': 1 for _ in _list}, [], debug=False,
> depth=5)
> Dict[int, str]{code}
>
> CPython bytecode changes[1] may affect.
> [1] https://docs.python.org/3/whatsnew/3.8.html
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