Home  >  Article  >  Backend Development  >  Three methods for deep and shallow copying of python3 lists

Three methods for deep and shallow copying of python3 lists

高洛峰
高洛峰Original
2017-03-26 18:30:312184browse

This article mainly provides an in-depth analysis of the three methods of deep and shallow copying of python3 lists. It has certain reference value. Interested friends can refer to it

# Auther: Aaron Fan

names = ["aaron", "alex", "james", "meihengfan"]

#复制一份列表

#浅复制 (注意,这只是一个浅复制,只能复制第一层列表里面的东西,如果列表里面还有一层列表,那么那一层的列表只是把物理地址指向过去了,但是并没有复制过来)
#在day2第9个视频,有详细讲这个浅复制的作用,这里不再详细注释

person = ["name", ["saving", 100]]

'''
浅复制的方法有3种:
p1 = person.copy()
p1 = person[:]
p1 = list(person)
'''

p1 = person[:]
p2 = person[:]
print(p1)
print(p2)


p1[0] = "alex"
p2[0] = "fengjie"
print(p1)
print(p2)

#注意第二层列别中的值同时变了,这里联合账号来理解浅复制的作用
p1[1][1] = 50
print(p1)
print(p2)


#深复制(这种复制属于完完全全的复制,可以把列表里面的列表也复制过来,而不是仅仅只是指向一个地址过去)
import copy
names2 = copy.deepcopy(names)

The above is the detailed content of Three methods for deep and shallow copying of python3 lists. For more information, please follow other related articles on the PHP Chinese website!

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn