Skip to content

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

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
gvanrossum merged 2 commits into from
Apr 5, 2021
Merged

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

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
de2f3b5
PEP 634: Change so __match_args__ must be a tuple
gvanrossum Apr 3, 2021
c7c76ab
Remove extra back tick
gvanrossum Apr 4, 2021
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
6 changes: 3 additions & 3 deletions pep-0634.rst
View file
Open in desktop
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
Expand Down