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snippets/python/s/symmetric-difference.md

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+---
+title: List symmetric difference
+type: snippet
+language: python
+tags: [list]
+cover: ice
+dateModified: 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.
+
+```py
+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]
+```
+
+```py
+symmetric_difference([1, 2, 3], [1, 2, 4]) # [3, 4]
+```