python之元组

 1 # 元组，元素不可被修改，不能被增加或者删除
 2 # tuple
 3 # tu = (11,22,33,44,)
 4 # tu.count(22),获取指定元素在元组中出现的次数
 5 # tu.index(22)
 6 # 1. 书写格式
 7 # tu = (111,"alex",(11,22),[(33,44)],True,33,44,)
 8 # 一般写元组的时候，推荐在最后加入 ,
 9 # 元素不可被修改，不能被增加或者删除
10 # 2. 索引
11 # v = tu[0]
12 # print(v)
13 
14 # 3. 切片
15 # v = tu[0:2]
16 # print(v)
17 
18 # 4. 可以被for循环，可迭代对象
19 # for item in tu:
20 #     print(item)
21 
22 # 5. 转换
23 s = "asdfasdf0"
24 li = ["asdf","asdfasdf"]
25 tu = ("asdf","asdf",)
26 
27 # v = tuple(s)
28 # print(v)
29 
30 # v = tuple(li)
31 # print(v)
32 
33 # v = list(tu)
34 # print(v)
35 
36 # v = "_".join(tu)
37 # print(v)
38 
39 # li = ["asdf","asdfasdf"]
40 # li.extend((11,22,33,))
41 # print(li)
42 
43 # 6.元组的一级元素不可修改/删除/增加
44 tu = (111,"alex",(11,22),[(33,44)],True,33,44,)
45 # # 元组，有序。
46 # v = tu[3][0][0]
47 # print(v)
48 # v=tu[3]
49 # print(v)
50 tu[3][0] = 567
51 print(tu)