.. _missing-format-attribute: missing-format-attribute / W1306 ================================ **Message emitted:** ``Missing format attribute %r in format specifier %r`` **Description:** *Used when a PEP 3101 format string uses an attribute specifier ({0.length}), but the argument passed for formatting doesn't have that attribute.* **Problematic code:** .. literalinclude:: /data/messages/m/missing-format-attribute/bad.py :language: python **Correct code:** .. literalinclude:: /data/messages/m/missing-format-attribute/good.py :language: python Created by the `string `__ checker.