python学习-18 元组

tuple

1.元组tuple类似列表,由小括号()括住,其中的元素不可被修改,不能被增加或删除

tu = (222,222123123,("小胡子",444),12341,"你好啊",["小明",123],)
print(tu)

运行结果:

(222, 222123123, ('小胡子', 444), 12341, '你好啊', ['小明', 123])

Process finished with exit code 0

ps:建议在最后加一个逗号,便于分辨(不会报错,但列表会)

 

2.取值

通过索引:

tu = (222,222123123,("小胡子",444),12341,"你好啊",["小明",123],)
a = tu[0]
print(a)

运行结果:

222

Process finished with exit code 0

通过切片:

tu = (222,222123123,("小胡子",444),12341,"你好啊",["小明",123],)
a = tu[0:5]
print(a)

运行结果:

(222, 222123123, ('小胡子', 444), 12341, '你好啊')

Process finished with exit code 0

for循环:

tu = (222,222123123,("小胡子",444),12341,"你好啊",["小明",123],)
for a in tu :

 print(a)

运算结果:

222
222123123
('小胡子', 444)
12341
你好啊
['小明', 123]

Process finished with exit code 0

 

3.转换

转换成列表:

tu = (222,"你好啊",["小明",123],)
a = list(tu)

print(a)

运行结果

[222, '你好啊', ['小明', 123]]

Process finished with exit code 0

转换成字符串:

 

tu = (222,"你好啊",["小明",123],)
b =" "
for a in tu:
    b = b + str(a)

print(b)

运行结果:

 222你好啊['小明', 123]

Process finished with exit code 0

ps:元组基本功能和列表是一样的。

 

4.元组一级元素无法增删改,但是里面的元素如果是列表是可以增删改的

tu = (222,"你好啊",["小明",123],)
tu[2][0]=132

print(tu)

运算结果:

(222, '你好啊', [132, 123])

Process finished with exit code 0

5.元组的方法

count   获取元素的个数

index  获取元素的索引

同列表的方法。

posted @ 2019-06-28 16:30  学python的菜鸟  阅读(457)  评论(0编辑  收藏  举报