.. _use-implicit-booleaness-not-len:

use-implicit-booleaness-not-len / C1802
=======================================

**Message emitted:**

``Do not use `len(SEQUENCE)` without comparison to determine if a sequence is empty``

**Description:**

*Empty sequences are considered false in a boolean context. You can either remove the call to 'len' (``if not x``) or compare the length against a scalar (``if len(x) > 1``).*

**Problematic code:**

.. literalinclude:: /data/messages/u/use-implicit-booleaness-not-len/bad.py
   :language: python

**Correct code:**

.. literalinclude:: /data/messages/u/use-implicit-booleaness-not-len/good.py
   :language: python





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