strrev的专栏

#eval()的用法#str2 = '18'str3 = '108.1'str4 = '(200, 300, 400)'str5 = "[100, 300, '400']"str6 = "{'zhangsan', True, 22, '400'}"print('整型int..........')print(eval(str2))print(type(eval(str2)))print('浮点型float..........')print(eval(str3))print(type(