'Either all return statements in a function should return an expression, or none of them should.'
According to PEP8, if any return statement returns an expression, any return statements where no value is returned should explicitly state this as return None, and an explicit return statement should be present at the end of the function (if reachable)
In the following example we implicitly return
None if the condition of the
if-statement was not met.
def example(arg): if arg > 1: return 1
1:0: R1710: Either all return statements in a function should return an expression, or none of them should.
This can be fixed by adding an explicit
def example(arg): if arg > 1: return 1 return None
No issues found.