[LintCode]Anagrams(Python)

class Solution:
    # @param strs: A list of strings
    # @return: A list of strings
    def anagrams(self, strs):
        # write your code here
        ret = []
        strs_reag = []
        strs_uni = []
        for str in strs:
            strs_reag.append(sorted(str))
        for str in strs_reag:
            if strs_reag.count(str) > 1 and str not in strs_uni:
                strs_uni.append(str)
        for str in strs_uni:
            for i in range(len(strs)):
                if str == strs_reag[i]:
                    ret.append(strs[i])
        return ret