On Wednesday, February 26, 2014 9:24:51 AM UTC-4:30, Daniel Roseman wrote:
>
> On Wednesday, 26 February 2014 08:10:40 UTC, ApathyBear wrote:
>>
>> Here is my urls.py:
>>
>> from django.conf.urls.defaults import *from mysite.views import hello,
>> current_datetime, hours_ahead
>> urlpatterns = patterns('',
>> url(r'^hello/$', hello),
>> url(r'^time/$', current_datetime),
>> url(r'^time/plus/(\d{1,2})/$', hours_ahead),)
>>
>> And here is my View function associated with hours_ahead
>>
>> from django.http import Http404, HttpResponseimport datetime
>> def hours_ahead(request, offset):
>> try:
>> offset = int(offset)
>> except ValueError:
>> raise Http404()
>> dt = datetime.datetime.now() + datetime.timedelta(hours=offset)
>> html = "<html><body>In %s hour(s), it will be %s.</body></html>" %
>> (offset, dt)
>> return HttpResponse(html)
>>
>> Now what is throwing me off is how 'offset' is a second argument to the
>> hours_ahead function. Yet I am not quite sure how it being the second
>> argument makes it the case that it is associated with whatever is entered
>> as a URL. Let me use an example to illustrate my confusion.
>>
>> Say I request the URL: http://127.0.0.1:8000/time/plus/2/ . Why is it
>> the case that offset is '2'? I am not seeing why '2' is plucked out? What
>> happened with 'time' and 'plus'? How does python/django know that the '2'
>> is referring to offset?
>>
> That is what the regular expression does in your first snippet. `time` and
> `plus` are just matched, but not captured: the only thing that is captured
> is `(\d{1,2})`, because it is surrounded in parentheses.
>
> If that's not clear for you, you should read a guide to regexes:
> http://regular-expressions.info is a good one.
>
Hello,
As Daniel points out, this is related to regular expressions. You can read
a full explanation here:
https://docs.djangoproject.com/en/1.6/topics/http/urls/#how-django-processes-a-request
You sholud also take a look at the 're' Python module.
Regards,
Camilo.
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