Add type hints to python code
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core
new feature
P3
python
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- Java
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Description
As a developer of the beam source code, I would like the code to use pep484 type hints so that I can clearly see what types are required, get completion in my IDE, and enforce code correctness via a static analyzer like mypy.
This may be considered a precursor to BEAM-7060
Work has been started here: [https://github.com/apache/beam/pull/9056](https://github.com/apache/beam/pull/9056)
Imported from Jira [BEAM-7746](https://issues.apache.org/jira/browse/BEAM-7746). Original Jira may contain additional context.
Reported by: chadrik.
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