代码改变世界

使用list和tuple

2018-07-18 15:08  改改~_~  阅读(284)  评论(0)    收藏  举报 
 1 'create a list '
 2 classmates = ['Jo','Joo','Jooo']
 3 
 4 print(len(classmates))
 5 
 6 print(classmates[0])
 7 print(classmates[1])
 8 print(classmates[2])
 9 # print(classmates[4]) #越界取值会报错
10 
11 print(classmates[-1])
12 print(classmates[-2])
13 print(classmates[-3])
14 
15 classmates.append('Joooo')
16 print(classmates)
17 
18 classmates.insert(1,'Jo1')
19 print(classmates)
20 
21 classmates.pop() #删除最后一个元素
22 print(classmates)
23 
24 classmates.pop(1)#删除序号为1的元浸塑
25 print(classmates)
26 
27 classmates[1] = 'Jo1'#修改序号为1的元素为Jo1
28 
29 print(classmates)
30 
31 classmates = ('Jo1','Jo2','Jo3','Jo4')
32 print(type(classmates))
33 print(classmates)
34 '定义一个空tuple'
35 tuple_0 = ()
36 print(type(tuple_0))#<class 'tuple'>
37 
38 tuple_1 = (1)
39 print(type(tuple_1))#<class 'int'>
40 
41 tuple_11 = (1,)
42 print(type(tuple_11))#<class 'tuple'>
43 
44 
45 tuple_conxp = (1,2,['A','B'])
46 print(tuple_conxp[2])
47 tuple_conxp[2][0] = 'X'
48 tuple_conxp[2][1] = 'Y'
49 print(tuple_conxp[2][0])
50 print(tuple_conxp[2][1])
51 print(tuple_conxp[2])
52 
53 
54 L = [
55     ['Apple','Google','Microsoft'],
56     ['Java','Python','Ruby','PHP'],
57     ['Adam','Bart','Lisa']
58 ]
59 print(L[0][0])  #Apple
60 print(L[1][1]) #Python
61 print(L[2][2]) #Lisa