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 format string, that is the string on the left hand side of an expression like fmt % arguments, must consist of legal conversion specifiers. Otherwise, a ValueError will be raised.
Recommendation¶
Choose a legal conversion specifier.
Example¶
In format_as_tuple_incorrect, “t” is not a legal conversion specifier.
def format_as_tuple_incorrect(args):
return "%t" % args
def format_as_tuple_correct(args):
return "%r" % (args,)
References¶
Python Library Reference: String Formatting.