Unsupported format character¶
ID: py/percent-format/unsupported-character
Kind: problem
Security severity:
Severity: error
Precision: high
Tags:
- quality
- reliability
- correctness
Query suites:
- python-security-and-quality.qls
Click to see the query in the CodeQL repository
A printf-style format string (i.e. a string that is used as the left hand side of the % operator, such as fmt % arguments) must consist of valid conversion specifiers, such as %s, %d, etc. Otherwise, a ValueError will be raised.
Recommendation¶
Ensure a valid conversion specifier is used.
Example¶
In the following example, format_as_tuple_incorrect, %t is not a valid conversion specifier.
def format_as_tuple_incorrect(args):
return "%t" % args
def format_as_tuple_correct(args):
return "%r" % (args,)
References¶
Python Library Reference: printf-style String Formatting.