[GitHub] [spark] zero323 commented on a change in pull request #34374: [SPARK-37104][PYTHON] Make RDD and DStream covariant

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zero323 commented on a change in pull request #34374:
URL: https://github.com/apache/spark/pull/34374#discussion_r741816277



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File path: python/pyspark/rdd.pyi
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@@ -60,6 +60,7 @@ from pyspark.sql._typing import RowLike
 from py4j.java_gateway import JavaObject  # type: ignore[import]
 
 T = TypeVar("T")
+T_ = TypeVar("T_", covariant=True)

Review comment:
       NumPy and some of the typeshed annotations use `_T`, `_T_co` and `_T_contra` for invariant, covariant, and contravariant respectively. It is a bit verbose for my taste, but otherwise looks good.
   
   Other projects I've seen (dry-python, django-stubs, pfun) don't use any special convention. Not the way I'd go :)




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