1 class Solution(object): 2 def toLowerCase(self, str): 3 """ 4 :type str: str 5 :rtype: str 6 """ 7 res = "" 8 for i, ch in enumerate(str): 9 if ord(ch) <= 90 and ord(ch) >= 65: 10 res += chr(ord(ch) + 32) 11 else: 12 res += ch 13 return res 14 15 def toLowerCase2(self, str): 16 """ 17 :type str: str 18 :rtype: str 19 """ 20 return str.lower() 21 22 23 if __name__ == '__main__': 24 solution = Solution() 25 print(solution.toLowerCase("HellO"))