Rename dataclass's __replace__ argument from "obj" to "self"?

[pschanely]

Bug report

Bug description:

The first argument of the new __replace__ method on dataclasses is conspicuously named obj rather than self. While that's not a bug, it would be kinder on introspection tools to use self, since it is otherwise a regular instance method.

>>> import dataclasses, inspect, pprint
>>> @dataclasses.dataclass
... class Foo:
...   x: int
... 
>>> pprint.pprint({n:inspect.signature(f) for n, f in inspect.getmembers(Foo, inspect.isfunction)})
{'__eq__': <Signature (self, other)>,
 '__init__': <Signature (self, x: int) -> None>,
 '__replace__': <Signature (obj, /, **changes)>,
 '__repr__': <Signature (self)>}

__replace__ was added in #108752

CPython versions tested on:

3.13

Operating systems tested on:

macOS

Linked PRs

• gh-114198: Rename dataclass __replace__ argument to 'self' #114251

[serhiy-storchaka]

It is a trivial change. You just need to rename a parameter of function _replace() in dataclasses module.

[ericvsmith]

@pschanely : Do you want to make a PR?

[pschanely]

@pschanely : Do you want to make a PR?

Oh. Well, I haven't contributed to cpython before, but I'm willing to give it a try.

[ericvsmith]

@pschanely : Reach out if you need any help!

[ericvsmith]

Thanks, @pschanely !