Assistance is needed

DISCLAIMER: I am new to python and coding in general So far I have managed to get this far and my code makes it to test 9 on extra where the test give me the an error stating "TypeError: 'float' object is not iterable, checkio, 3" I have tried switching the return to interger but it does not correctly round and fails on test 3. Code: def checkio(args): if args: return max(args) - min(*args) else: return 0