.. _unnecessary-negation:

unnecessary-negation / C0117
============================

**Message emitted:**

``Consider changing "%s" to "%s"``

**Description:**

*Used when a boolean expression contains an unneeded negation, e.g. when two negation operators cancel each other out.*

**Problematic code:**

``double_not.py``:

.. literalinclude:: /data/messages/u/unnecessary-negation/bad/double_not.py
    :language: python


``equivalent_comparator_exists.py``:

.. literalinclude:: /data/messages/u/unnecessary-negation/bad/equivalent_comparator_exists.py
    :language: python


**Correct code:**

``double_not.py``:

.. literalinclude:: /data/messages/u/unnecessary-negation/good/double_not.py
    :language: python


``equivalent_comparator_exists.py``:

.. literalinclude:: /data/messages/u/unnecessary-negation/good/equivalent_comparator_exists.py
    :language: python






Created by the `refactoring <https://github.com/pylint-dev/pylint/blob/main/pylint/checkers/refactoring/not_checker.py>`__ checker.