Feature or enhancement
Currently there are two places in our typing-related code that raise a DeprecationWarning when type_params parameter is not provided:
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def _eval_type(t, globalns, localns, type_params=_sentinel, *, recursive_guard=frozenset(), |
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format=None, owner=None): |
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"""Evaluate all forward references in the given type t. |
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For use of globalns and localns see the docstring for get_type_hints(). |
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recursive_guard is used to prevent infinite recursion with a recursive |
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ForwardRef. |
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""" |
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if type_params is _sentinel: |
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_deprecation_warning_for_no_type_params_passed("typing._eval_type") |
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type_params = () |
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def _evaluate(self, globalns, localns, type_params=_sentinel, *, recursive_guard): |
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import typing |
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import warnings |
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if type_params is _sentinel: |
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typing._deprecation_warning_for_no_type_params_passed( |
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"typing.ForwardRef._evaluate" |
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) |
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type_params = () |
The error message of this function says that the behavior will change in 3.15 to disallow this:
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def _deprecation_warning_for_no_type_params_passed(funcname: str) -> None: |
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import warnings |
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depr_message = ( |
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f"Failing to pass a value to the 'type_params' parameter " |
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f"of {funcname!r} is deprecated, as it leads to incorrect behaviour " |
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f"when calling {funcname} on a stringified annotation " |
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f"that references a PEP 695 type parameter. " |
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f"It will be disallowed in Python 3.15." |
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) |
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warnings.warn(depr_message, category=DeprecationWarning, stacklevel=3) |
So, we have several options:
- Adding
TypeError('type_params parameter is not provided') when type_params is _sentinel
- Changing
type_params to not contain a default value
- Do nothing?
CC @JelleZijlstra @AlexWaygood
I would like to work on this after we decide the fate of these functions :)
Linked PRs
