CodeQL library for Python
codeql/python-all 0.7.2 (changelog, source)
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Member predicate Function::isLambda

Holds if this function represents a lambda.

The extractor reifies each lambda expression as a (local) function with the name “lambda”. As lambda is a keyword in Python, it’s impossible to create a function with this name otherwise, and so it’s impossible to get a non-lambda function accidentally classified as a lambda.

predicate isLambda()