How to remove duplicates in an array in python

Question

I'm trying to implement a difference function, which subtracts one list from another and returns the result. Here is what i have so far:

def array_diff(a, b):
    for e in b[:]:
        for i in a:
            a.remove(i)
    return a


in1 = [1, 2, 2]
in2 = [1]
print(array_diff(in1, in2))

I have two sample tests that i'd like to run.

Test.assert_equals(array_diff([1,2,2], [1]), [2,2], "a was [1,2,2], b was [1], expected [2,2]")
Test.assert_equals(array_diff([1,2,2], [2]), [1], "a was [1,2,2], b was [2], expected [1]")

How would i be able to remove the same value more than once?

Does this answer your question? Delete intersection between two lists — Edeki Okoh
– Edeki Okoh, Commented Feb 14, 2020 at 20:04

Onyambu · Accepted Answer · 2020-02-14 20:14:33Z

1

array_diff = lambda a, b: [ i for i in a if i not in b]

array_diff(in1,[1])
 [2, 2]

array_diff(in1,[2])
 [1]

answered Feb 14, 2020 at 20:14

Onyambu

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