Group Anagrams

from collections import defaultdict
class Solution:
    def groupAnagrams(self, strs: List[str]) -> List[List[str]]:
        d = defaultdict(list)
        for word in strs:
            count = [0 for x in range(26)]
            for letter in word:
                count[ord(letter)-ord('a')] += 1
            count = [str(i) for i in count]

            d['#'.join(count)].append(word)
        return  list(d.values())