python基础入门---数列的一些增删改查操作

数列的一些增删改查操作

import copy
names = ["aa","bb","cc","dd"]
print(names)
print(names[1],names[2])
print(names[0:2])#切片，要头不要尾
print(names[:2])#和上一个结果一样
print(names[-1])#切片,取倒数第一个
print(names[-2])#切片，取倒数第二个
print(names[-2:])#切片,省略后面的


print("\n")
names.append("ee")#在末尾增加一个
print(names)
names.insert(1,"ee")#插在那位数的后面
print(names)
names.insert(3,"ff")
print(names)
names[2] = "gg"#修改某个数
print(names)
names.remove("cc")
print(names)
del names[1]#删除某个数
print(names)
names.pop(1)#删除某个数,没写默认删除最后一个
print(names)
print(names.count("ee"))#计算ee的个数

names.reverse()#排序反转
print(names)
names.sort()#按字母排序
print(names)

print("\n")
names2 = ["qqjjhh"]
names.extend(names2)#把names2合拼到names
print(names)

print("\n")
names3 = copy.deepcopy(names)#names3复制names
print(names3)

结果显示如下

['aa', 'bb', 'cc', 'dd']
bb cc
['aa', 'bb']
['aa', 'bb']
dd
cc
['cc', 'dd']


['aa', 'bb', 'cc', 'dd', 'ee']
['aa', 'ee', 'bb', 'cc', 'dd', 'ee']
['aa', 'ee', 'bb', 'ff', 'cc', 'dd', 'ee']
['aa', 'ee', 'gg', 'ff', 'cc', 'dd', 'ee']
['aa', 'ee', 'gg', 'ff', 'dd', 'ee']
['aa', 'gg', 'ff', 'dd', 'ee']
['aa', 'ff', 'dd', 'ee']
1
['ee', 'dd', 'ff', 'aa']
['aa', 'dd', 'ee', 'ff']


['aa', 'dd', 'ee', 'ff', 'qqjjhh']


['aa', 'dd', 'ee', 'ff', 'qqjjhh']

 

非深度copy即浅copy：

import copy

person = ['name',['a',100]]
p1 = person[:]
p2 = person[:]
p2[0]="asd"
p1[1][1]=50
print(p1)
print(p2)

结果：

['name', ['a', 50]]
['asd', ['a', 50]]#可以看到p1改变成50，p2也跟着改变了