在Python中遍历日期

Question

这是我的代码：

MYDATE = []
start_date = "2011-01-01"
stop_date = "2013-05-01"

start = start_date.strftime("%Y-%m-%d")
stop = stop_date.strftime("%Y-%m-%d")
for r in .......:
    MYDATE.append((r,r))

我该如何遍历start_date和stop_date之间的日期呢？

Answer 1

那关于 timedelta 呢？

start = datetime.now()
end = start + timedelta(days=10)

tmp = start

while tmp < end:
    print tmp
    tmp = tmp + timedelta(days=1) # replace the interval at will

打印输出

2014-04-07 10:42:14.943790
2014-04-08 10:42:14.943790
2014-04-09 10:42:14.943790
2014-04-10 10:42:14.943790
2014-04-11 10:42:14.943790
2014-04-12 10:42:14.943790
2014-04-13 10:42:14.943790
2014-04-14 10:42:14.943790
2014-04-15 10:42:14.943790
2014-04-16 10:42:14.943790

Answer 2

这要看你想怎么遍历数据了。是按天遍历？还是按月遍历？如果你用 timedelta，就能解决你的问题。

from datetime import datetime

start_date = "2011-01-01"
stop_date = "2013-05-01"

start = datetime.strptime(start_date, "%Y-%m-%d")
stop = datetime.strptime(stop_date, "%Y-%m-%d")

from datetime import timedelta
while start < stop:
    start = start + timedelta(days=1)  # increase day one by one

另一种按月遍历的方法是使用 relativedelta。

from dateutil.relativedelta import relativedelta
start = start + relativedelta(months = +1)