Valentyn Tymofieiev created BEAM-7060:
-----------------------------------------
Summary: Design Py3-compatible typehints annotation support in
Beam 3.
Key: BEAM-7060
URL: https://issues.apache.org/jira/browse/BEAM-7060
Project: Beam
Issue Type: Bug
Components: sdk-py-core
Reporter: Valentyn Tymofieiev
Existing [Typehints implementaiton in
Beam|[https://github.com/apache/beam/blob/master/sdks/python/apache_beam/typehints/
] heavily relies on internal details of CPython implementation, and some of the
assumptions of this implementation broke as of Python 3.6, see for example:
https://issues.apache.org/jira/browse/BEAM-6877, which makes typehints support
unusable on Python 3.6 as of now.[ Python 3 Kanban
Board|https://issues.apache.org/jira/secure/RapidBoard.jspa?rapidView=245&view=detail]
lists several specific typehints-related breakages, prefixed with "TypeHints
Py3 Error".
We need to decide whether to:
- Deprecate in-house typehints implementation.
- Continue to support in-house implementation, which at this point is a stale
code and has other known issues.
- Attempt to use some off-the-shelf libraries for supporting type-annotations,
like Pytype, Mypy, PyAnnotate.
WRT to this decision we also need to plan on immediate next steps to unblock
adoption of Beam for Python 3.6+ users. One potential option may be to have
Beam SDK ignore any typehint annotations on Py 3.6+.
cc: [~udim], [~altay], [~robertwb].
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