# 遍历时间段内每一天  循环

begin=datetime.strptime('2017-1-1','%Y-%m-%d')

end=datetime.strptime('2017-12-31','%Y-%m-%d')

b=begin.date()

e=end.date()

for i in range((e - b).days+1): 

    myday = b + timedelta(days=i) 

    print(myday)