.. _unsupported-membership-test:

unsupported-membership-test / E1135
===================================

**Message emitted:**

``Value '%s' doesn't support membership test``

**Description:**

*Emitted when an instance in membership test expression doesn't implement membership protocol (__contains__/__iter__/__getitem__).*

**Problematic code:**

.. literalinclude:: /data/messages/u/unsupported-membership-test/bad.py
   :language: python

**Correct code:**

.. literalinclude:: /data/messages/u/unsupported-membership-test/good.py
   :language: python





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