元组

1.创建元组

        在括号中添加元素，并使用逗号隔开即可
        tup1 = ("IE","google")
        
        创建空元组
        tup2 = ()
        
        创建只包含一个元素时，元素后面要添加逗号
        tup2=(1,)

2.访问元组：

        tup1 = ('google','IE','firefox','edge')
        tup2= (1,2,3)
        print(tup1[1])              #IE
        print(tup1[:len(tup1)-1])   # ('google', 'IE', 'firefox')
        for i in tup1:print(i)

3.元组运算符：

        len(tup1)                       #计算元素个数
        tup1+tup2                       # 连接
        (tup1)*2                        # 复制
        'google' in tup1              # 元素是否存在
        for x in tup1:print(x)         # 迭代



4.函数

        len(tuple)                      # 计算元组元素个数
        max(tuple)                      # 返回元组中元素最大值
        min(tuple)                      # 返回元组中元素最小值
        tuple(seq)                      # 将序列转换为元组

        eg:
        tup1 = (1,5,2,6,1)
        li = ['google','Ie','firefox']
        str = "hello"
        print(len(tup1))
        print(max(tup1))
        print(min(tup1))
        tup2 = tuple(li)
        print(tup2)
        tup3 = tuple(str)
        print(tup3)