01 上周内容回顾 int bool str int < --- > str: i1 = 100    str(i1) s1 = '10'    int(s1)字符串必须是数字组成. int < --- > bool: i2 = 10 非零即True True ---> 1 Fasle ----> 0 bool <---> str: str ---> bool :非空即True '' Fasle bool < --- > str: str:…