.. _cell-var-from-loop:

cell-var-from-loop / W0640
==========================

**Message emitted:**

``Cell variable %s defined in loop``

**Description:**

*A variable used in a closure is defined in a loop. This will result in all closures using the same value for the closed-over variable.*

**Problematic code:**

.. literalinclude:: /data/messages/c/cell-var-from-loop/bad.py
   :language: python

**Correct code:**

``functools.partial.py``:

.. literalinclude:: /data/messages/c/cell-var-from-loop/good/functools.partial.py
    :language: python


``new_function.py``:

.. literalinclude:: /data/messages/c/cell-var-from-loop/good/new_function.py
    :language: python




**Related links:**

- `Stackoverflow discussion <https://stackoverflow.com/questions/25314547/cell-var-from-loop-warning-from-pylint>`_


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