Checking if two strings are permutations of each other in Python

Question

I\'m checking if two strings a and b are permutations of each other, and I\'m wondering what the ideal way to do this is in Python. From the Zen of

Answer 1

from collections import defaultdict
def permutation(s1,s2):
    h = defaultdict(int)
    for ch in s1:
        h[ch]+=1
    for ch in s2:
        h[ch]-=1
    for key in h.keys():
        if h[key]!=0 or len(s1)!= len(s2):
            return False
        return True
print(permutation("tictac","tactic"))