Python set Union and set Intersection operate differently?

Question

I\'m doing some set operations in Python, and I noticed something odd..

>> set([1,2,3]) | set([2,3,4])
set([1, 2, 3, 4])
>> set().union(*[[1,2,3], [2         


        

Answer 1

[removed incorrect answer]

As @Anto Vinish suggested you should first convert the lists to sets and then use set.intersection

For example:

>>> sets = [set([1, 2, 3]), set([2, 3, 4]), set([3, 4, 5])]
>>> set.intersection(*sets)
set([3])