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Python set symmetric_difference_update()

  • Last Updated : 02 Sep, 2020

The symmetric difference of two sets is the set of elements which are in either of the sets but not in both of them.
 

symmetric-difference

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Symmetric Difference is marked in Green
symmetric_difference() method returns a new set which contains symmetric difference of two sets. The symmetric_difference_update() method updates the set calling symmetric_difference_update() with the symmetric difference of sets.
 



Syntax: 
A.symmetric_difference_update(B) 
Parameters: 
The symmetric_difference takes a single “iterable” as an argument. Iterable should contain hashable object.
Returns: 
This method returns None (which indicates absence of a return value). It only updates the set calling symmetric_difference_update() with the symmetric difference of sets.

CODE 1 
 

Python




# Python code to demonstrate working of
# symmetric_difference_update()
 
A = {'p', 'a', 'w', 'a', 'n'}
B = {'r', 'a', 'o', 'n', 'e'}
 
# result is always none.
result = A.symmetric_difference_update(B)
 
print('A = ', A)
print('B = ', B)
print('result = ', result)

Output: 
 

('A = ', set(['e', 'o', 'p', 'r', 'w']))
('B = ', set(['a', 'r', 'e', 'o', 'n']))
('result = ', None)



CODE 2 
 

Python




# Python code to demonstrate working of
# symmetric_difference_update()
 
A = {'s', 'u', 'n', 'n', 'y'}
B = {'b', 'u', 'n', 'n', 'y'}
 
# result is always none.
result = A.symmetric_difference_update(B)
 
print('A = ', A)
print('B = ', B)
print('result = ', result)

Output: 
 

('A = ', set(['s', 'b']))
('B = ', set(['y', 'b', 'u', 'n']))
('result = ', None)



CODE 3:

Python




# Python code to demonstrate working of
# symmetric_difference_update()
 
A = {1, 2, 3, 4, 5, 6}
B = [4, 5, 7, 8]
 
# passing argument as list
 
A.symmetric_difference_update(B)
print("A =", A)
 
A = {2, 4, 6, 8}
B = (i for i in range(2, 6))
 
# passing argument as generator object
 
A.symmetric_difference_update(B)
print("A=", A)
Output
('A =', set([1, 2, 3, 6, 7, 8]))
('A=', set([3, 5, 6, 8]))





CODE 4:

Python




# Python code to demonstrate working of
# symmetric_difference_update()
 
A = {1, 2, 3, 4, 5}
B = [[1, 2, 3], 4, 5]
 
# error as b contain one element as list(unhashable object)
 
A.symmetric_difference_update(B)
print("A =", A)

Output

Traceback (most recent call last):
  File "/home/1b4e24cadc3fabcd5f90141964a60e9b.py", line 9, in <module>
    A.symmetric_difference_update(B)
TypeError: unhashable type: 'list'








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