Learn Python Training from the Best Tutors

  • Affordable fees
  • 1-1 or Group class
  • Flexible Timings
  • Verified Tutors

Search in

Shallow And Deep Copying

Praveen Choudhary
19/02/2018 0 0

The difference between shallow and deep copying is only relevant for compound objects (objects that contain other objects, like lists or class instances):

A shallow copy constructs a new compound object and then (to the extent possible) inserts references into it to the objects found in the original.

A deep copy constructs a new compound object and then, recursively, inserts copies into it of the objects found in the original.

Here's a little demonstration:

import copy

a = [1, 2, 3]
b = [4, 5, 6]
c = [a, b]

Using normal assignment operatings to copy:

d = c

print id(c) == id(d) # True - d is the same object as c
print id(c[0]) == id(d[0]) # True - d[0] is the same object as c[0]
Using a shallow copy:

d = copy.copy(c)

print id(c) == id(d) # False - d is now a new object
print id(c[0]) == id(d[0]) # True - d[0] is the same object as c[0]
Using a deep copy:

d = copy.deepcopy(c)

print id(c) == id(d) # False - d is now a new object
print id(c[0]) == id(d[0]) # False - d[0] is now a new object.

0 Dislike
Follow 2

Please Enter a comment


Other Lessons for You

How to know if an object is iterable?
An object in python is said to be an iterable if it obeys one of the following two rules:- 1. Object must consist of __getitem__ method 2. Object must consist of __iter__ method. String objects generally...

Why is the Hadoop essential?
Capacity to store and process large measures of any information, rapidly. With information volumes and assortments always expanding, particularly from web-based life and the Internet of Things (IoT), that...

Different types of data in python3
Python3 features Numbers(int,float,complex), String, Lists, Tuples, Dictionary and Sets type of data. long interger type numbers from python2 is no longer required. Below are examples of all python3 data...

Built-In Functions (Python)
Built-in Functions: The Python interpreter has a number of functions built into it that are always available. They are listed here in alphabetical order. Built-in Functions abs() divmod() input() open() staticmethod() all() enumerate() int() ord() str() any() eval() isinstance() pow() sum() basestring() execfile() issubclass() print() super() bin() file() iter() property() tuple() bool() filter() len() range() type() bytearray() float() list() raw_input() unichr() callable() format() locals() reduce() unicode() chr() frozenset() long() reload() vars() classmethod() getattr() map() repr() xrange() cmp() globals() max() reversed() zip() compile() hasattr() memoryview() round() __import__() complex() hash() min() set() ...

A program to determine the molecular weight of a hydrocarbon based on the number of Hydrogen,Carbon and Oxygen atoms.
import osimport math# A program to calculate Molecular Weight of a Hydrocarbon # These are the atomic weights(grams/mole) of Hydrogen,Carbon and OxygenatomicwtH = 1.0079atomicwtC = 12.011atomicwtO = 15.994Hatoms...

Looking for Python Training Classes?

The best tutors for Python Training Classes are on UrbanPro

  • Select the best Tutor
  • Book & Attend a Free Demo
  • Pay and start Learning

Learn Python Training with the Best Tutors

The best Tutors for Python Training Classes are on UrbanPro

This website uses cookies

We use cookies to improve user experience. Choose what cookies you allow us to use. You can read more about our Cookie Policy in our Privacy Policy

Accept All
Decline All

UrbanPro.com is India's largest network of most trusted tutors and institutes. Over 55 lakh students rely on UrbanPro.com, to fulfill their learning requirements across 1,000+ categories. Using UrbanPro.com, parents, and students can compare multiple Tutors and Institutes and choose the one that best suits their requirements. More than 7.5 lakh verified Tutors and Institutes are helping millions of students every day and growing their tutoring business on UrbanPro.com. Whether you are looking for a tutor to learn mathematics, a German language trainer to brush up your German language skills or an institute to upgrade your IT skills, we have got the best selection of Tutors and Training Institutes for you. Read more