Breaking News: Grepper is joining You.com. Read the official announcement!

shallow copy deep copy python

Grotesque Gibbon answered on July 7, 2022 Popularity 10/10 Helpfulness 1/10

answer shallow copy deep copy python

related Shallow copy in python

shallow copy deep copy python

Comment

#shallow copy: one level deep, only references of nested child objects
#deep copy: full independent copy

# shallow copy: only 1 level deep (i.e. not work on nested list)
import copy

org = [0, 1, 2, 3]
# 4 options
cpy = copy.copy(org)    #use copy module
cpy = org.copy()        #list has a copy option
cpy = list(org)         #make new list
cpy = org[:]              #slicing trick

cpy[0] = 100
print(org)
print(cpy)
# [0, 1, 2, 3]
# [100, 1, 2, 3]


#deep copy: 
import copy

org = [[0, 1, 2, 3], [4, 5, 6, 7]]
cpy = copy.deepcopy(org)
cpy[0][1] = 100
print(org)
print(cpy) 
# [[0, 1, 2, 3], [4, 5, 6, 7]]
# [[0, 100, 2, 3], [4, 5, 6, 7]]


# level of copy layers also apply to custome classes
import copy

class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age

class Company:
    def __init__(self, boss, emp):
        self.boss = boss
        self.emp = emp

p1 = Person('Alex', 55)
p2 = Person('Joe', 25)
company = Company(p1, 2)
company_clone = copy.deepcopy(company)  #deepcopy bc class is 2 layers deep
company_clone.boss.age = 56
print(company_clone.boss.age)
print(company.boss.age)
# 56
# 55

Popularity 10/10 Helpfulness 1/10 Language python

Source: Grepper

Tags: deep-copy python shallow-copy

Link to this answer
Share Copy Link

Contributed on Aug 16 2022

Grotesque Gibbon

0 Answers Avg Quality 2/10

Closely Related Answers

Shallow copy in python

Comment

import copy
list1 = [[9, 8, 7], [6, 5, 4], [3, 2, 1]]
list2 = copy.copy(list1)
print("Old list:", list1)
print("New list:", list2)

Popularity 10/10 Helpfulness 2/10 Language python

Source: softhunt.net

Tags: python py

Link to this answer
Share Copy Link

Contributed on Jul 07 2022

Outrageous Ostrich

0 Answers Avg Quality 2/10

shallow copy deep copy python

Contents

More Related Answers

shallow copy deep copy python

Closely Related Answers

Shallow copy in python

Grepper

Documentation

Social

Legal

Contact

Oops, You will need to install Grepper and log-in to perform this action.