# What changed in pylint

> 42 changes in pylint 4 from its official release notes, upgrade guides and advisories: 2 breaking, 1 deprecations. Each one cited. Sources checked 2026-10-21. HTML: https://unstale.sh/pypi/pylint/

To see which of these apply to a repository, run `npx @unstale/cli init` in it.

## pylint 4

### Breaking changes

- Using several output formats that all write to stdout now raises an error instead of printing every message more than once. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- Overload stubs in subclasses are no longer compared to the overridden method; methods with overloads are compared through their implementation instead of their first stub. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)

### Deprecations

- Explicitly passing confidence=None to add_message, add_ignored_message, or Message emits a DeprecationWarning and will raise an error in pylint 5.0. (4.1.2) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.2)

### Fixes and other changes

- Overload stubs in subclasses are no longer compared to the overridden method; methods with overloads are compared through their implementation instead of their first stub. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- No longer reports this false positive when an attribute is assigned inside the setter of an old-style property(fget, fset) call. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- The checker is disabled when min-similarity-lines is set to 0, as documented, and no longer crashes. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- The difference column now shows the change since the previous run instead of repeating the previous count. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- Allows the __main__ module name in camelCase, PascalCase, and UPPER_CASE naming styles without reporting this message. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- No longer reports false positives for module-level all-caps aliases that preserve the name of an external callable. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- The difference column now shows the change since the previous run instead of repeating the previous count. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- No longer suggests a non-equivalent rewrite when an inner min or max call has multiple arguments. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- Comprehensions inside branches that cannot run are no longer checked for missing members. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- Calls to functions whose bodies contain only an ellipsis are no longer inferred as returning None, preventing false positives on their results. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- Calls to functions whose bodies contain only an ellipsis are no longer inferred as returning None, preventing false positives on their results. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- Calls to functions whose bodies contain only an ellipsis are no longer inferred as returning None, preventing false positives on their results. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- No longer reports this false positive when a lambda uses its parameters, including from a nested lambda, and that name is assigned later in the module. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- No longer reports a false positive when a subclass of a subscripted generic base accesses a protected member through that base. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- No longer crashes when a diagram includes a class created by namedtuple or an argparse.Namespace. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- Avoids hanging or crashing with RecursionError when --all-associated follows an attribute whose inferred class is rebuilt by astroid on every inference. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- No longer warns for method parameters that retain a built-in name from an overridden method. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- No longer emits this message when the bare _ variable is reused to discard values of different types. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- No longer reports this false positive in .pyi stub files where __init__ bodies are ellipses. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- Fixes an IndexError crash when an Enum class defines an __init__ method without arguments. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- No longer reports this false positive when a decorator returning its argument unchanged is stacked above a decorator accepting **kwargs. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- No longer reports a false positive for an ellipsis-only Protocol method inside a conditional block such as if TYPE_CHECKING. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- No longer reports a false positive when negating a comparison between instances of a set or frozenset subclass. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- Calls to functions whose bodies contain only an ellipsis are no longer inferred as returning None, preventing false positives on their results. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- Does not emit this message for a yield immediately after raise or sys.exit() when the yield marks a function as a generator. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- No longer reports unused arguments in .pyi stub files where function bodies are ellipses. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- No longer reports a name used by a later target of the same assignment as used before assignment. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- No longer reports a name bound by a tuple or list target of a with item as used before assignment when used by a later item in the same with statement. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- No longer reports a name assigned in a comprehension condition as used before assignment when it is used in the element. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- No longer reports this false positive when a keyword-only parameter is passed to the parent under the same keyword with a different value. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- No longer reports a false positive for a line-too-long suppression when a # inside a string literal precedes the pylint comment. (4.1.3) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.3)
- Fixes a crash when the class of a called attribute cannot be fully inferred, including when the attribute is a with-statement target or appears inside a comprehension. (4.1.2) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.2)
- Fixes a crash when calling __bases__ on a class. (4.1.2) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.2)
- Passing confidence=None to add_message, add_ignored_message, or Message is accepted again and means UNDEFINED. (4.1.2) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.2)
- Fixes a crash when a name bound by a type statement (a TypeVar) is used in a with statement. (4.1.2) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.2)
- Fixes a false positive when unpacking a tuple concatenation whose elements have several possible values. (4.1.2) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.2)
- Fixes a crash in this check when import final is used. (4.1.2) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.2)
- Fixes a TypeError when checking a class whose metaclass name binding has no line number. (4.1.2) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.2)
- Pylint 4.1.1 is the first 4.1 release available on PyPI after 4.1.0 required an unreleased dill version on Python 3.15. (4.1.1) — [release notes](https://github.com/pylint-dev/pylint/releases/tag/v4.1.1)