How to find a single element in a set that isn't in another using set comprehension

Question

I have two sets, set1 and set2... Almost all elements in both sets are the same except for one element.

Supporting code is below:

set1 = {'dog', 'cat', 'turtle', 'monkey'}
set2 = {'dog', 'cat', 'turtle', 'gorilla'}

I am trying to get the unique element of each set into its own variable using set comprehension.

set1Unique = 'monkey'
set2Unique = 'gorilla'

I have got it working by doing the following but it is not what is required, using set comprehension is.

    set1UniqueElements = set1 - set2
    set1Unique = list(set1UniqueElements)[0]

Answer 1

If you are guaranteed that there is at least one element in set2 that is not in set1, and you're only looking for the first such element:

next(e for e in set2 if e not in set1)

This code stops as soon as it find any element in set2 not in set1.

Answer 2

Since there is only a single unique element, it is possible to use packing to access the elements directly:

[set1Unique] = set1 - set2
[set2Unique] = set2 - set1

Answer 3

I would use this:

ex = set1 ^ set2
set1unique = ex & set1
set2unique = ex & set2

print(set1unique)
print(set2unique)

You can can compute ex inside the setNunique formulas. It saves a line, but you compute ex twice.