bad-format-string / W1302

Message emitted:

Invalid format string

Description:

Used when a PEP 3101 format string is invalid.

Problematic code:

print("{a[0] + a[1]}".format(a=[0, 1]))  # [bad-format-string]

Correct code:

print("{a[0]} + {a[1]}".format(a=[0, 1]))

Related links:

• Format String Syntax

• PyFormat

Created by the string checker.