invalid-format-index / W1307#

Message emitted:

Using invalid lookup key %r in format specifier %r


Used when a PEP 3101 format string uses a lookup specifier ({a[1]}), but the argument passed for formatting doesn't contain or doesn't have that key as an attribute.

Correct code:

# This is a placeholder for correct code for this message.

Additional details:

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Created by the string checker.