Improve taskflow type hints with ParamSpec #25173
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This is made available with our latest Mypy update. ParamSpec allows us to more accurately type a decorated task to return an XComArg (while still being correctly typed to accept the same arguments as the decorated function). This allows us to provide autocompletion for XComArg operations, such as map() and zip() introduced in AIP-42.
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ashb
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Jul 26, 2022
| @@ -47,7 +47,7 @@ class SalesforceBulkOperator(BaseOperator): | |||
| def __init__( | |||
| self, | |||
| *, | |||
| operation: Literal[available_operations], | |||
| operation: Literal['insert', 'update', 'upsert', 'delete', 'hard_delete'], | |||
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Is it not possible to do
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| operation: Literal['insert', 'update', 'upsert', 'delete', 'hard_delete'], | |
| operation: Literal[*available_operations], |
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Python syntactically does not allow using * in brackets. The previous Literal[available_operations] is valid Python but PEP 586 considered this out of scope.
This was referenced Aug 10, 2022
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This needs #25085 to be merged first. Only the last commit is relevant.Submitted for CI now.This should be ready. I needed to fix a few more (valid although unrelated) typing issues since Mypy started to flag them.
The main thing here is to replace the
Functiontype var withCallable[FParams, FReturn]so we can do polymorphism againstFParamswithout being tied toFReturn.