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PEP 634: Change so __match_args__ must be a tuple #1909

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Apr 5, 2021
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PEP 634: Change so __match_args__ must be a tuple #1909

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PEP 634: Change so __match_args__ must be a tuple
gvanrossum Apr 3, 2021
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Remove extra back tick
gvanrossum Apr 4, 2021
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6 changes: 3 additions & 3 deletions pep-0634.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -492,10 +492,10 @@ as follows:
the entire subject; for these types no keyword patterns are accepted.
- The equivalent of ``getattr(cls, "__match_args__", ()))`` is called.
- If this raises an exception the exception bubbles up.
- If the returned value is not a list or tuple, the conversion fails
- If the returned value is not a tuple, the conversion fails
and ``TypeError`` is raised.
- If there are more positional patterns than the length of
``__match_args__``` (as obtained using ``len()``), ``TypeError`` is raised.
``__match_args__`` (as obtained using ``len()``), ``TypeError`` is raised.
- Otherwise, positional pattern ``i`` is converted to a keyword pattern
using ``__match_args__[i]`` as the keyword,
provided it the latter is a string;
Expand All @@ -513,7 +513,7 @@ positional subpatterns is different:
This behavior is roughly equivalent to the following::

class C:
__match_args__ = ["__match_self_prop__"]
__match_args__ = ("__match_self_prop__",)
@property
def __match_self_prop__(self):
return self
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