Question: Make this program return None, if an invalid input appear def problem one(test string): p=len(test_string) problem one=test_string[p::-1]+ return problem_one Make this program return None, if

Make this program return "None", if an invalid input appear def e

Make this program return None", if an invalid input appear def problem one(test string): p=len(test_string) problem one=test_string[p::-1]+ return problem_one

Make this program return "None", if an invalid input appear def e return problem_pnee

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