difference() method in Python set

All set methods

Returns a new set with difference elements of main set only ( after removing common elements) . Original sets remains unchanged.
  • Video Tutorial on Set


difference using - operator

All difference elements of first set
Using minus ( - ) operator
A={1,2,3}
B={3,4,5}
print(A - B)
Output
{1,2}

Using type()

We can check the output by using type()
A={1,2,3}
B={3,4,5}
x=A - B 
print(type(x))
Output
<class 'set'>

Using difference() method

A={'a','b','c'}
B={'a','y','z'}
print(A.difference(B))
Output
{'c', 'b'}

Using more than one sets

We can use any number of sets with difference()
A={'a','b','c'}
B={'a','y','z'}
C={'a','b','l'}
print(A - B - C)
Output
{'c'}

difference() method

Using string ( iterable object ) with difference() method
A={'a','b','c','x','y'}
B='Alex'
print(A.difference(B))
Output
{'a', 'c', 'y', 'b'}
Using list with difference() method.
A={'a','b','c'}
B=['a','x','y']
print(A.difference(B))
Output
{'c', 'b'}
Below code will generate error.
print(A - B)
 TypeError: unsupported operand type(s) for -: 'set' and 'list'

difference_update()

In all above code by using difference() we created a new set. By using difference_update() method we can change the original set with difference elements.
All set methods Questions with solutions on set
union() intersection() symmetric_difference()


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