Add is_contained_in

snippets/is_contained_in.md

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+---
+title: is_contained_in
+tags: list,intermediate
+---
+
+Returns `True` if the elements of the first λιστ are contained in the second one regardless of order, `False` otherwise.
+
+Use `count()` to check if any value in `a` has more occurences than it has in `b`, returing `False` if any such value is found, `True` otherwise.
+
+```py
+def is_contained_in(a, b):
+  for v in set(a):
+    if a.count(v) > b.count(v):
+      return False
+  return True
+```
+
+```py
+is_contained_in([1, 4], [2, 4, 1]) # True
+```