日期时间（超出日期的天数）Python

Question

I have a problem with my script.

end = date(2012, 6, 20)
start = date(2012, 5, 01)
delta = end - start
delta = delta.days
print 'The number of days taken into account for training periods testing:', delta

all_training_periods=[pd.date_range(start=dt.datetime(2012, 5, 01+k),end=dt.datetime(2012, 6,20),freq='10T') for k in range(0,delta)]

The problem is that I have an error message telling me:

  File "<ipython-input-192-57c97670a7f1>", line 1, in <module>
    all_training_periods=[pd.date_range(start=dt.datetime(2012, 5, 01+k),end=dt.datetime(2012, 6,20),freq='10T') for k in range(0,delta)]

ValueError: day is out of range for month

The thing here is that I want different training period from the 1st of May to the 20th of June, from the 2nd of May to the 20th of June, ..., from the 19th of June to the 20th of June.

Answer 1

我建议像这样增加日期：

datetime.date(2012, 5, 1) + datetime.timedelta(k, 0)

Answer 2

In your code

end = date(2012, 6, 20)
start = date(2012, 5, 01)
delta = end - start

Where delta.days evaluates 50. Then in your line:

dt.datetime(2012, 5, 01+k)

will end up with something like:

dt.datetime(2012, 5, 01+49)

Then datetime will throw exception since May do not have 49 days. No month have more than 31 days.

Try this:

from datetime import timedelta
dt.datetime(2012, 5, 01) + timedelta(days=k)

This will make the correct calculation.