pylint-dev/pylint v4.1.4

on GitHub

What's new in Pylint 4.1.4?

Release date: 2026-11-14

False Positives Fixed

• Fix a false positive for using-constant-test when testing a method or function
  whose decorator is unknown or is a class, such as a third-party cached_property.
  astroid still infers such a method as a method, but the decorator may have turned
  it into any other value.

  Closes #3484

• Avoid dict-init-mutate when an assignment's key or value references the dictionary being initialized.
  Stop the suggested dictionary literal before later assignments that reference the dictionary.

  Closes #7997

• Fixed a false positive for unreachable when a terminating function call
  (such as sys.exit()) is inside a compound expression within a lambda body.

  Closes #8567

• Fix a false positive for used-before-assignment when a class body uses a module-level or builtin name that a method or nested class defined later in the same class body shadows.

  Closes #9134

• Fixed a false positive undefined-variable (E0602) when a name annotated
  without a value (x: int) is assigned with the walrus operator (:=) in
  the condition of a comprehension spanning several lines, and used in its element.

  Closes #11647

• Fix a false positive for method-hidden when a decorated method is inferred
  as a property.

  Refs #11732

• Fix false positives for bad-dunder-name on __prepare__, __mro_entries__,
  __buffer__, __release_buffer__ (Python 3.12+) and __replace__ (Python 3.13+).

  Closes #11791

Other Bug Fixes

• Pyreverse now reports a clear error instead of a traceback when --class names
  an unknown class or module, or omits the module name when analyzing multiple modules.
  Targets whose inferred values are all known not to be classes are also rejected.
  If a target has several inferred values, Pyreverse uses the first class among them.

  Closes #22

• Fix a crash when linting a package whose parent directory is an implicit namespace package
  that also exists in site-packages or the standard library: the module paths of the files inside it could not be
  resolved, and the given package was reported without its package prefix.

  Closes #10278

• Fix a crash in the logging checker when a logging call uses a bytes format string that is not valid UTF-8.

  Closes #10813

• Fixed an AssertionError crash in the typecheck checker when accessing an attribute on an Enum exception instance.

  Closes #11638

• Fixed a crash in use-maxsplit-arg (C0207) when a str.split() or
  str.rsplit() call indexed by a variable is used inside a loop that assigns
  to a subscript, an attribute or an unpacked tuple (for example obj[0] = 1,
  obj.attr = 1 or a, b = 1, 2). Such targets have no name attribute
  and previously raised AttributeError.

  The index variable is now also recognized as changed in the loop when it is
  reassigned through tuple unpacking or an assignment expression (:=), which
  removes a false positive.

  Refs #11676

• --generate-toml-config and --generate-rcfile now include the plugins given with
  --load-plugins or --enable-all-extensions.

  Closes #11699

• Checkers loaded with --load-plugins or init-hook are no longer registered twice in every
  worker process, which used to emit each of their messages twice when --jobs was greater than 1.

  Closes #11701

Other Changes

• Backslashes in message and option descriptions are now escaped in the generated
  documentation and in --full-documentation, so use "\b" instead no longer
  renders as use "b" instead.

  Closes #10737