Compare multiple lists inside a list Python [duplicate]

Question

Is it possible to compare a list containing an unknown number of lists with equal elements in a more terse (aka shorter) manner than what I have done? Preferably an one-liner!

Here's an example if it's unclear what I want to do:

a = [1, 2, 3]
b = [4, 2, 1]
c = [7, 5, 1]
d = [a, b, c]

def multiCompList(lists):
    final = [i for i in lists[0] if i in lists[1]]
    for i in range(2, len(lists)):
        final = [i for i in final if i in lists[i]]

    return final

print(multiCompList(d))

What I've done is to first check if the first and second list contains any equal elements and put them in a list called final. Thereafter, checking if those elements can be found in the lists after and replacing the final-list with the remaining equal elements. The results in this case is: [1].

you want to find the intersection of all the lists? does the order matter? — Chris_Rands
– Chris_Rands, Commented Oct 31, 2018 at 15:43
@Chris_Rands No I guess intersection of first two lists and third to nth list intersection. So not mere intersection of all the list — mad_
– mad_, Commented Oct 31, 2018 at 15:44
Perhaps you can apply your learning from here stackoverflow.com/questions/3852780/… — Rahul Chawla
– Rahul Chawla, Commented Oct 31, 2018 at 15:45
You sample example and explanation is tangential. DO u want to get common values from all the lists? — mad_
– mad_, Commented Oct 31, 2018 at 15:54

zipa · Accepted Answer · 2018-10-31 15:46:59Z

0

A oneliner would look like this:

set.intersection(*[set(x) for x in d])
#set([1])

answered Oct 31, 2018 at 15:46

zipa

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