Add ability to type PTransforms with input and output by making it a generic
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core
P3
python
types
wish
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- Java
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Description
beam.PTransform should be a generic type to enable us to type it with input and output. For example:
```
MyTransform(beam.PTransform[PCollection[str], PCollection[bool]])
```
Imported from Jira [BEAM-14088](https://issues.apache.org/jira/browse/BEAM-14088). Original Jira may contain additional context.
Reported by: yeandy.
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