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set copy() in python

  • Last Updated : 02 Jan, 2018

The copy() method returns a shallow copy of the set in python. If we use “=” to copy a set to another set, when we modify in the copied set, the changes are also reflected in the original set. So we have to create a shallow copy of the set such that when we modify something in the copied set, changes are not reflected back in the original set.

Syntax:

set_name.copy()

set_name: Name of the set whose copy
          we want to generate.

Parameters:The copy() method for sets doesn’t take any parameters.

Return value:The function returns a shallow copy of the original set.

Below is the implementation of the above function:




# Python3 program to demonstrate the use
# of join() function 
  
set1 = {1, 2, 3, 4
  
# function to copy the set
set2 = set1.copy() 
  
# prints the copied set
print(set2)       

Output:

{1, 2, 3, 4} 

Shallow Copy Example :




# Python program to demonstrate that copy 
# created using set copy is shallow
first = {'g', 'e', 'e', 'k', 's'}
second = first.copy()
  
# before adding
print 'before adding: '
print 'first: ',first
print 'second: ', second 
  
# Adding element to second, first does not
# change.
second.add('f')
  
# after adding
print 'after adding: '
print 'first: ', first
print 'second: ', second 

Output:

before adding: 
first:  set(['s', 'e', 'k', 'g'])
second:  set(['s', 'e', 'k', 'g'])
after adding: 
first:  set(['s', 'e', 'k', 'g'])
second:  set(['s', 'e', 'k', 'g', 'f'])


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