count(string, substring) This function is intended to mimic the behavior of the string method count().It returns the number of nonoverlapping instances of substring in string For instance, count('aaaa', 'aa') should return 2 find(string, substring) This function is intended to mimic the behavior of the string method find(). It should return the lowest index in string where substring is found. Return-1 if substring is not found. def count(string, substring): ***Count the number of non-overlapping instances of substring in string. ** pass def find(string, substring): 'Return the index where the first instance of substring in string begins; -1 if substring is not found.' pass