If a function does not return anything, it makes no sense to use its output. Specifically, passing it to another function, or assigning its
"result" to a variable is probably a bug because such functions return nothing, which is probably not what was intended.
Code examples
Noncompliant code example
def foo():
l = [1, 2, 3]
result = l.append(42) # Noncompliant, `append` mutates list l
return result
Compliant solution
def foo():
l = [1, 2, 3]
l.append(42)
return l
