python学习之元组

#创建空的元组
tuple1 = ()
print(tuple1,type(tuple1))
输出结果：
() <class 'tuple'>

#在定义元组里面只有一个元素时必须使用逗号隔开
tuple3 = ([1,2,3],)
print(tuple3,type(tuple3))
tuple2 = ([1,2,3])
print(tuple2,type(tuple2))
输出结果：
([1, 2, 3],) <class 'tuple'>
[1, 2, 3] <class 'list'>

#定义普通的元组
tuple4 = (1,2,3)
print(tuple4,type(tuple4))
输出结果：
(1, 2, 3) <class 'tuple'>

tuple4 = (1,2,3,4,5,6,7)
print(tuple4[5])       #查询元组的第五个索引值
print(tuple4[1:6])     #查询元组的索引值从1到6的元素
print(tuple4[::-1])     #将元组的元素反转显示
print(tuple4[1:7:2])  #查询元组索引值为1到7，步长为2的元素
输出结果：
6
(2, 3, 4, 5, 6)
(7, 6, 5, 4, 3, 2, 1)
(2, 4, 6)

tuple4 = (1,2,3,4,5,6,7)
tuple5 = ('a','b','c','d')
print(tuple4+tuple5)
输出结果：
(1, 2, 3, 4, 5, 6, 7, 'a', 'b', 'c', 'd')

tuple4 = (1,2,3,4,5,6,7)
del(tuple4)
print(tuple4)
如果进行输出的话会报名字错误，该元组没有被定义
NameError: name 'tuple4' is not defined

tuple4 = (1,2,3,4,5,6,7)
print(tuple4*2)
输出结果：
(1, 2, 3, 4, 5, 6, 7, 1, 2, 3, 4, 5, 6, 7)

tuple()：将其他函数转化为元组
list1 = [1,2,3,4,5]
print(list1,type(list1))
tuple3 = tuple(list1)
print(tuple3,type(tuple3)))
输出结果：
[1, 2, 3, 4, 5] <class 'list'>
(1, 2, 3, 4, 5) <class 'tuple'>

min(): 返回元组中元素最小的值
print(min(tuple3))
输出结果：
1

max(): 返回元组中元素最大的值
print(max(tuple3))
输出结果：
5

len(): 返回元组中元素的个数
print(len(tuple3))
输出结果：
5