30-seconds-of-code/snippets/python/s/is-perm.md

title, type, language, tags, cover, dateModified

title	type	language	tags	cover	dateModified
Check if two iterables are permutations of each other	snippet	python	list	apples	2023-05-23 10:48:03 +0100

Check if two iterables are permutations of each other.

• Use Counter to verify that each element in both iterables appear an equal number of times.

from collections import Counter

def is_perm(items0, items1):
  return len(items0) == len(items1) and Counter(items0) == Counter(items1)

is_perm([1, 2, 3], [4, 1, 6]) # False
is_perm([1, 2], [2, 1]) # True

is_perm("dad", "add") # True
is_perm("snack", "track") # False