Question: Make this program return none if the input is not a string: def problem_one(test_string): p=len(test string) problem one=test_string[p::-1]+ return problem_onet W oo

Make this program return none if the input is not a string: def problem_one(test_string): p=len(test string) problem one=test_string[p::-1]+ return problem_onet W oo
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