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snippets/python/s/intersection.md

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+---
+title: List intersection
+type: snippet
+language: python
+tags: [list]
+cover: wooden-bowl
+dateModified: 2020-11-02T19:28:05+02:00
+---
+
+Returns a list of elements that exist in both lists.
+
+- Create a `set` from `a` and `b`.
+- Use the built-in set operator `&` to only keep values contained in both sets, then transform the `set` back into a `list`.
+
+```py
+def intersection(a, b):
+  _a, _b = set(a), set(b)
+  return list(_a & _b)
+```
+
+```py
+intersection([1, 2, 3], [4, 3, 2]) # [2, 3]
+```