I want to intersect several(e.g. 3) lists.
a = ["a", "b", "c"]
b = ["d", "e", "f"]
c = ["g", "h", "i"]
There is an intersect1d method from numpy, but it accepts only 2 arrays per call, so, that is not that comfortable to use. Are their any methods, which accepts a bunch of lists at once?
If you had your lists in a list, you could do the following:
a = ["a", "b", "c"]
b = ["a", "e", "f"]
c = ["a", "h", "i"]
lists = [a, b, c]
intersection = list(reduce(lambda u, v: u&v, (set(x) for x in lists)))
print(intersection)
#['a']
Intersect works with Sets and uses & to perform the operation. As it sits, you will return an empty set. If you change your lists a little, you can see it work.
a = ["a", "b", "c"]
b = ["d", "a", "f"]
c = ["g", "h", "a"]
set(a) & set(b) & set(c)
This is my preferred syntax:
a = ["a", "b", "c"]
b = ["a", "e", "f"]
c = ["a", "h", "i"]
set.intersection(*map(set, (a, b, c)))
# {'a'}
setand use the&operator- for example:list(set(a)&set(b)&set(c)). However, the intersection for your example is an empty set.