详解Python的三种拷贝方式

import copy
 
#对列表的增删改
numbers_Ori = ['one', 'two', 'three', 'four']
print('origin')
print(numbers_Ori)
 
#deepcopy()是copy包里的方法，作用是将一个列表完全复制一份，赋值给指定新列表
#若只是用numbers = numbers_Ori来赋值则两个变量名将指向同一内存区域，修改任意一个后另一个也会随之变动
 
#增
numbers_2 = copy.deepcopy(numbers_Ori)
numbers_2.append('five')
print('append//////////////////')
print(numbers_2)
 
numbers_3 = copy.deepcopy(numbers_Ori)
numbers_3.insert(2, 'two and_a_half')
print('insert////////////////////')
print(numbers_3)
 
#删
numbers_4 = copy.deepcopy(numbers_Ori)
del numbers_4[2]
print('del///////////////////////')
print(numbers_4)
 
numbers_5 = copy.deepcopy(numbers_Ori)
num=numbers_5.pop(3)
print('pop////////////////////////')
print(numbers_5)
print('picked ' + num + ' up')
 
numbers_6 = copy.deepcopy(numbers_Ori)
numbers_6.remove('one')
print('remove/////////////////////')
print(numbers_6)
 
#改
numbers_7 = copy.deepcopy(numbers_Ori)
numbers_7[0] = '1'
print('改/////////////////////////')
print(numbers_7)
 
#可尝试将每一个"copy.deepcopy(numbers_Ori)"换成单独的"numbers_Ori"尝试赋值拷贝
#或换成"numbers_Ori.copy()"尝试浅拷贝

numbers = ['one', 'two', 'three', 'four', 'five', ['six', 'seven', ['eight', 'nine']]]
numbers_1 = numbers.copy()
numbers_1.append('add')#在一维列表的末尾添加字符串
print(numbers_1)
print(numbers)
numbers = ['one', 'two', 'three', 'four', 'five', ['six', 'seven', ['eight', 'nine']]]
numbers_1 = numbers.copy()
numbers_1[-1].append('add')#在二维列表的末尾添加字符串
print(numbers_1)
print(numbers)
numbers = ['one', 'two', 'three', 'four', 'five', ['six', 'seven', ['eight', 'nine']]]
numbers_1 = numbers.copy()
numbers_1[-1][-1].append('add')#在三维列表的末尾添加字符串
print(numbers_1)
print(numbers)