pylint-errors
W1307 (invalid-format-index)
Problematic code:
print('{a[1]}'.format(a=[0]))
Correct code:
print('{a[1]}'.format(a=[0, 1]))
Rationale:
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.