https://leetcode.com/problems/group-anagrams/

group_ana.py

class Solution:
    def groupAnagrams(self, strs: 'List[str]') -> 'List[List[str]]':
        from collections import Counter
        d = {}
        for s in strs:
            c = ''.join(sorted(s))
            if c in d:
                d[c].append(s)
            else:
                d[c] = [s]
        a = list(d.values())
        return a