invalid-format-index / W1307#
Message emitted:
Using invalid lookup key %r in format specifier %r
Description:
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.