thanks for all the responses. still finding it very confusing!! but got it to work (without having to import in the loop).
I used:
from datetime import datetime as dt

but I also had to call:
from datetime import timedelta

and now it seems to work nicely. thank you


On Fri, Apr 20, 2012 at 3:36 AM, Benjamin Root <ben.root@ou.edu> wrote:


On Thu, Apr 19, 2012 at 1:21 PM, Goyo <goyodiaz@gmail.com> wrote:
El día 19 de abril de 2012 05:31, questions anon
<questions.anon@gmail.com> escribió:
> Thank you, I was able to get it to work but only if I imported datetime
> within the loop, otherwise I ended up with the
> AttributeError: type object 'datetime.datetime' has no attribute 'datetime'
> and if I added 'import datetime' at the top of my script it had an error
> where I loop through combining each month
> "    stop_month = datetime(2011, 03, 01)
> TypeError: 'module' object is not callable"

If you can write a standalone, minimal executable script which
reproduces the problem I'll take a look. Send it as an attachement and
add sample data files if necessary.

Goyo


The issue is that there is a slight mixup in namespaces.  There is a module called datetime, and that module contains a class object called datetime.  So, if your imports at the top are "import datetime", then all your module-related stuff need to be prepended with "datetime.". But, if your imports at the top are "from datetime import datetime", then you can use the object freely, but you can't use anything else from the module unless you also import it.

Here is the tricky part.  In your code, you did the following:

from datetime import datetime

If you then did:

import datetime

depending on the order the two were, one would overwrite the other.  You can only have one thing called "datetime".  Personally, I would do one of two things:

import datetime as dt

and use "dt.datetime()" to create datetime objects as well as call functions like "dt.strftime()". Or, do

from datetime import datetime, date, timedelta, strftime

and get replace calls like "datetime.datetime()" and "datetime.strftime()" with just "datetime()" and "strftime()".

I hope that clears things up.  Namespaces are a honking good idea, but having objects be the same exact name as a module gets confusing very easily.

Cheers!
Ben Root