1print("hello world".rfind("ll")) 2print("hello world".rfind("ll", None)) 3print("hello world".rfind("ll", 1)) 4print("hello world".rfind("ll", 1, None)) 5print("hello world".rfind("ll", None, None)) 6print("hello world".rfind("ll", 1, -1)) 7print("hello world".rfind("ll", 1, 1)) 8print("hello world".rfind("ll", 1, 2)) 9print("hello world".rfind("ll", 1, 3)) 10print("hello world".rfind("ll", 1, 4)) 11print("hello world".rfind("ll", 1, 5)) 12print("hello world".rfind("ll", -100)) 13print("0000".rfind('0')) 14print("0000".rfind('0', 0)) 15print("0000".rfind('0', 1)) 16print("0000".rfind('0', 2)) 17print("0000".rfind('0', 3)) 18print("0000".rfind('0', 4)) 19print("0000".rfind('0', 5)) 20print("0000".rfind('-1', 3)) 21print("0000".rfind('1', 3)) 22print("0000".rfind('1', 4)) 23print("0000".rfind('1', 5)) 24print("aaaaaaaaaaa".rfind("bbb", 9, 2)) 25