Find non-common elements in lists

I'm trying to write a piece of code that can automatically factor an expression. For example, if I have two lists [1,2,3,4] and [2,3,5], the code should be able to find the common elements in the two lists, [2,3], and combine the rest of the elements together in a new list, being [1,4,5].

From this post: How to find list intersection? I see that the common elements can be found by

set([1,2,3,4]&set([2,3,5]). 

Is there an easy way to retrieve non-common elements from each list, in my example being [1,4] and [5]?

I can go ahead and do a for loop:

lists = [[1,2,3,4],[2,3,5]]
conCommon = []
common = [2,3]
for elem in lists:
    for elem in eachList:
    if elem not in common:
        nonCommon += elem

But this seems redundant and inefficient. Does Python provide any handy function that can do that? Thanks in advance!!

Use the symmetric difference operator for sets (aka the XOR operator):

>>> set([1,2,3]) ^ set([3,4,5])
set([1, 2, 4, 5])