Python小辣鸡的逆袭第五章之if语句

第五章 if语句

5.1 简单示例

5.2 条件测试

5.2.1 比较字符串与数字

    与C语言类似  "=="  "!="  ">="  "<="

    Python与C语言不同，多个判断条件用"and"和"or"

    数字比较需要注意的点：关于input(),其返回值是str，需用int()函数对其进行转换才可以直接与数字进行比较

5.2.2 检查特定值是否在列表中

        检查是否包含用"in" eg: cars=['audi','bmw']

                                                    if 'audi' in cars:

                                                        print('true')

       检查是否不包含用"not in"

5.2.3 布尔表达式

5.3 if语句

         if语句，if-else语句，if-elif-else语句，if-elif语句

        使用多个列表时，eg:all=['green','red','yellow','grey']

                                          likes=['green','red']

                                           for like in likes:

                                               if like in all:

                                                    print("your likes are"+like+'!')

                                               else：

                                                    print("sorry,we don't have thin color!")