format-combined-specification / W1305#

Message emitted:

Format string contains both automatic field numbering and manual field specification

Description:

Used when a PEP 3101 format string contains both automatic field numbering (e.g. '{}') and manual field specification (e.g. '{0}').

Correct code:

print('{0} {1}'.format('hello', 'world'))
# or
print('{} {}'.format('hello', 'world'))

Problematic code:

print('{} {1}'.format('hello', 'world'))  # [format-combined-specification]

Created by the string checker.