python给定起始和结束日期，如何得到中间所有日期

import datetime  start='2016-06-01'  end='2017-01-01'  datestart=datetime.datetime.strptime(start,'%Y-%m-%d')  dateend=datetime.datetime.strptime(end,'%Y-%m-%d')  while datestart<dateend:      datestart+=datetime.timedelta(days=1)      print datestart.strftime('%Y-%m-%d')