mailto = [‘cc‘, ‘bbbb‘, ‘afa‘, ‘sss‘, ‘bbbb‘, ‘cc‘, ‘shafa‘] addr_to = list(set(mailto)) addr_to.sort(key = mailto.index)
python 对列表去重，并保持列表原来顺序
原文：http://www.cnblogs.com/wt11/p/7766042.html
