30-seconds-of-code/snippets/symmetric_difference.md

title, tags, firstSeen, lastUpdated

title	tags	firstSeen	lastUpdated
List symmetric difference	list,intermediate	2019-08-21T08:37:04+03:00	2020-11-02T19:28:35+02:00

Returns the symmetric difference between two iterables, without filtering out duplicate values.

• Create a set from each list.
• Use a list comprehension on each of them to only keep values not contained in the previously created set of the other.

def symmetric_difference(a, b):
  (_a, _b) = (set(a), set(b))
  return [item for item in a if item not in _b] + [item for item in b
          if item not in _a]

symmetric_difference([1, 2, 3], [1, 2, 4]) # [3, 4]