Opposite of set.intersection in python?

Question

In Python you can use a.intersection(b) to find the items common to both sets.

Is there a way to do the disjoint opposite version of this? Ite

Answer 1

The best way is a list comprehension.

a = [ 1,2,3,4]
b = [ 8,7,9,2,1]
c = [ element for element in a if element not in b] 
d = [ element for element in b if element not in a] 
print(c) 
# output is [ 3,4]
print(d) 
# output is  [8,7,9]

You can join both lists