最喜欢用python做这种数据结构类型的操作了origin = [ ('john', 'canada'), ('bob', 'usa'), ('tom', 'usa'), ('alice', 'canada'), ('alan', 'canada'), ('peter', 'uk') ] temp = [] def detect(t): if t[1] not in temp: temp.append(t[1]) return True return False print(list(filter(lambda t: detect(t), origin)))