v4.0.5

What's new in Pylint 4.0.5?

Release date: 2026-02-20

False Positives Fixed

• Fix possibly-used-before-assignment false positive when using self.fail() in tests.

  Closes #10743

• Fixed false positive for logging-unsupported-format when no arguments are provided to logging functions.

  According to Python's logging documentation, no formatting is performed when no arguments are supplied, so strings like logging.error("%test") are valid.

  Closes #10752

• Fix a false positive for invalid-name where a dataclass field typed with Final
  was evaluated against the class_const regex instead of the class_attribute regex.

  Closes #10790

• Avoid emitting unspecified-encoding (W1514) when py-version is 3.15+.

  Refs #10791

Other Bug Fixes

• Fix --known_third_party config being ignored.

  Closes #10801

• Fixed dynamic color mapping for "fail-on" messages when using multiple reporter/output formats.

  Closes #10825

• dependency on isort is now set to <9, permitting to use isort 8.

  Closes #10857