Unnecessary delete statement in function¶
ID: py/unnecessary-delete Kind: problem Severity: warning Precision: high Tags: - maintainability - useless-code Query suites: - python-security-and-quality.qls
Click to see the query in the CodeQL repository
Passing a local variable to a
del statement results in that variable being removed from the local namespace. When exiting a function all local variables are deleted, so it is unnecessary to explicitly delete variables in such cases.
In the function below, the variable
x is assigned a value that is used for a calculation, and is then explicitly deleted before the function exits. In this case, the delete statement can be removed without changing the behavior of the function.
def unnecessary_delete(): x = get_some_object() do_calculation(x) del x # This del statement is unnecessary
Python: The ‘del’ statement.
Python/C API Reference Manual: Reference counts.