Removing the common elements between two lists [duplicate]

Question

Possible Duplicate:
Python list subtraction operation

I want to remove the common elements between two lists. I mean something like this

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a=[1,2,3,4,5,6,7,8]
b=[2,4,1]
# I want the result to be like
res=[3,5,6,7,8]

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Is there any simple pythonic way to do this ?

Answer 1

use sets :

res = list(set(a)^set(b))