一、列表
作用：多个装备，多个爱好，多门课程，多个女朋友等
定义：[]内可以有多个任意类型的值，逗号分隔
以下是列表的常用操作：
1 l=[1,2,3] #l=list([1,2,3])
2 # print(type(l))
3
4 #pat1===》优先掌握部分
5 # 索引：l=[1,2,3,4,5]
6 print(l[0]) 7 # 切片
8 l=['a','b','c','d','e','f']
9
10 # print(l[1:5])
11 # print(l[1:5:2])
12 # print(l[2:5])
13 # print(l[-1])
14
15
16 #了解
17 # print(l[-1:-4])
18 # print(l[-4:])
19 # l=['a','b','c','d','e','f']
20 # print(l[-2:])
21
22 # 追加
23 # hobbies=['play','eat','sleep','study']
24 # hobbies.append('girls')
25 # print(hobbies)
26
27 # 删除
28 hobbies=['play','eat','sleep','study']
29 # x=hobbies.pop(1) #不是单纯的删除，是删除并且把删除的元素返回，我们可以用一个变量名去接收该返回值
30 # print(x)
31 # print(hobbies)
32
33 # x=hobbies.pop(0)
34 # print(x)
35 #
36 # x=hobbies.pop(0)
37 # print(x)
38
39 #队列：先进先出
40 queue_l=[]
41 #入队
42 # queue_l.append('first')
43 # queue_l.append('second')
44 # queue_l.append('third')
45 # print(queue_l)
46 #出队
47 # print(queue_l.pop(0))
48 # print(queue_l.pop(0))
49 # print(queue_l.pop(0))
50
51
52 #堆栈:先进后出，后进先出
53 # l=[]
54 # #入栈
55 # l.append('first')
56 # l.append('second')
57 # l.append('third')
58 # #出栈
59 # print(l)
60 # print(l.pop())
61 # print(l.pop())
62 # print(l.pop())
63
64 #了解
65 # del hobbies[1] #单纯的删除
66 # hobbies.remove('eat') #单纯的删除，并且是指定元素去删除
67
68
69 # 长度
70 # hobbies=['play','eat','sleep','study']
71 # print(len(hobbies))
72
73 # 包含in
74 # hobbies=['play','eat','sleep','study']
75 # print('sleep' in hobbies)
76
77 # msg='hello world egon'
78 # print('egon' in msg)
79
80
81 ##pat2===》掌握部分
82 hobbies=['play','eat','sleep','study','eat','eat']
83 # hobbies.insert(1,'walk')
84 # hobbies.insert(1,['walk1','walk2','walk3'])
85 # print(hobbies)
86
87 # print(hobbies.count('eat'))
88 # print(hobbies)
89 # hobbies.extend(['walk1','walk2','walk3'])
90 # print(hobbies)
91
92 hobbies=['play','eat','sleep','study','eat','eat']
93 # print(hobbies.index('eat'))
94
95
96 #pat3===》了解部分
97 hobbies=['play','eat','sleep','study','eat','eat']
98 # hobbies.clear()
99 # print(hobbies)
100
101 # l=hobbies.copy()
102 # print(l)
103
104 # l=[1,2,3,4,5]
105 # l.reverse()
106 # print(l)
107
108 l=[100,9,-2,11,32]
109 l.sort(reverse=True)
110 print(l)