CodeQL library for Python
codeql/python-all 1.0.2 (changelog, source)

Predicate allowParameterReturnInSelf

Holds if flow is allowed to pass from parameter p and back to itself as a side-effect, resulting in a summary from p to itself.

One example would be to allow flow like =;, which is disallowed by default as a heuristic.

Import path

predicate allowParameterReturnInSelf(ParameterNode p)