49.Group Anagrams(sorted，dict)

Given an array of strings, group anagrams together.

Example:

Input: ["eat", "tea", "tan", "ate", "nat", "bat"],

Output:

[

["ate","eat","tea"],

["nat","tan"],

["bat"]]

Note:

All inputs will be in lowercase.
The order of your output does not matter.

class Solution:
    def groupAnagrams(self, strs):
        """
        :type strs: List[str]
        :rtype: List[List[str]]
        """
        dict = {}
        for i in strs:
            key = ‘‘.join(sorted(i))
            if key not in dict:
                dict[key] = [i]
            else:
                dict[key].append(i)
        return list(dict.values())

对于s=‘eat‘,那么sorted(s) = [‘a‘,‘e‘,‘t‘] 它返回的是一个list。而list是不可被哈希的元素。所以需要用key作为键，否则会报错。

可哈希的元素有：int、float、str、tuple

不可哈希的元素有：list、set、dict

原文地址：https://www.cnblogs.com/bernieloveslife/p/9750115.html