列表

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
  7 l=['a','b','c','d','e','f']
  8 
  9 # print(l[1:5])
 10 # print(l[1:5:2])
 11 # print(l[2:5])
 12 # print(l[-1])
 13 
 14 
 15 #了解
 16 # print(l[-1:-4])
 17 # print(l[-4:])
 18 # l=['a','b','c','d','e','f']
 19 # print(l[-2:])
 20 
 21 # 　　追加
 22 # hobbies=['play','eat','sleep','study']
 23 # hobbies.append('girls')
 24 # print(hobbies)
 25 
 26 # 　　删除
 27 hobbies=['play','eat','sleep','study']
 28 # 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
 29 # print(x)
 30 # print(hobbies)
 31 
 32 # x=hobbies.pop(0)
 33 # print(x)
 34 #
 35 # x=hobbies.pop(0)
 36 # print(x)
 37 
 38 #队列：先进先出
 39 queue_l=[]
 40 #入队
 41 # queue_l.append('first')
 42 # queue_l.append('second')
 43 # queue_l.append('third')
 44 # print(queue_l)
 45 #出队
 46 # print(queue_l.pop(0))
 47 # print(queue_l.pop(0))
 48 # print(queue_l.pop(0))
 49 
 50 
 51 #堆栈:先进后出，后进先出
 52 # l=[]
 53 # #入栈
 54 # l.append('first')
 55 # l.append('second')
 56 # l.append('third')
 57 # #出栈
 58 # print(l)
 59 # print(l.pop())
 60 # print(l.pop())
 61 # print(l.pop())
 62 
 63 #了解
 64 # del hobbies[1] #单纯的删除
 65 # hobbies.remove('eat') #单纯的删除，并且是指定元素去删除
 66 
 67 
 68 # 　　长度
 69 # hobbies=['play','eat','sleep','study']
 70 # print(len(hobbies))
 71 
 72 # 　　包含in
 73 # hobbies=['play','eat','sleep','study']
 74 # print('sleep' in hobbies)
 75 
 76 # msg='hello world egon'
 77 # print('egon' in msg)
 78 
 79 
 80 ##pat2===》掌握部分
 81 hobbies=['play','eat','sleep','study','eat','eat']
 82 # hobbies.insert(1,'walk')
 83 # hobbies.insert(1,['walk1','walk2','walk3'])
 84 # print(hobbies)
 85 
 86 # print(hobbies.count('eat'))
 87 # print(hobbies)
 88 # hobbies.extend(['walk1','walk2','walk3'])
 89 # print(hobbies)
 90 
 91 hobbies=['play','eat','sleep','study','eat','eat']
 92 # print(hobbies.index('eat'))
 93 
 94 
 95 #pat3===》了解部分
 96 hobbies=['play','eat','sleep','study','eat','eat']
 97 # hobbies.clear()
 98 # print(hobbies)
 99 
100 # l=hobbies.copy()
101 # print(l)
102 
103 # l=[1,2,3,4,5]
104 # l.reverse()
105 # print(l)
106 
107 l=[100,9,-2,11,32]
108 l.sort(reverse=True)
109 print(l)