Python中内置函数append()、extend()的用法及区别详解

list1 = [1, 2]
list1.append(0) #添加整数类型
print('list1=', list1)

list2 = [1, 2]
list2.append(1.23) #添加浮点数类型
print('list2=', list2)

list3 = [1, 2]
list3.append('everything') #添加字符串类型
print('list3=', list3)

list1 = [1, 2]
a = [1, 2, 3] #列表
list1.append(a)
print('list1=', list1)

list2 = [1, 2]
b = {'小明': 1, '小虎': 2} #字典
list2.append(b)
print('list2=', list2)

name_list = ['sam', 'dean']
number_list = [1, 2, 3]
name_list.append(number_list)
print(number_list)
print(name_list)

a = 4
number_list.append(a)
print(number_list)
print(name_list)

name_list = ['sam', 'dean']
number_list = [1, 2, 3]
name_list.append(number_list)

print(id(number_list)) #number_list的引用地址
print(id(name_list[2]))  #添加后的引用地址

name_list = ['sam', 'dean']
number_list = {'a': 1, 'b': 2, }
name_list.append(number_list)
print(name_list)

print(id(name_list[2]))
print(id(number_list))

number_list['a'] = 3
print(number_list)
print(name_list)

import copy
name_list = ['sam', 'dean']
number_list = [1, 2, 3]
name_list.append(copy.deepcopy(number_list)) #直接拷贝number_list的内容
print(number_list)
print(name_list)

print(id(number_list))
print(id(name_list[2])) #查看此时被添加到name_list中number_list的地址

a = 4
number_list.append(a)
print(number_list)
print(name_list)

import copy
name_list = ['sam', 'dean']
number_list = {'a': 1, 'b': 2, }
name_list.append(copy.deepcopy(number_list))
print(name_list)

print(id(name_list[2]))
print(id(number_list))

number_list['a'] = 3
print(number_list)
print(name_list)

list1 = [1, 2]
a = [1, 2, 3]
list1.extend(a)
print(list1)

list2 = ['sam', 'dean']
b = {'dd': 1, 'mm': 2}
list2.extend(b)
print(list2)