Boris Ozegovic a écrit :
> Hi, I'am still learning Python and while reading Django tutorial couldn't
> understand this part:
>
> class Poll(models.Model):
> question = models.CharField(maxlength=200)
> pub_date = models.DateTimeField('date published')
>
>
> # Django provides a rich database lookup API that's entirely driven by
> # keyword arguments.
>
>>>>Poll.objects.filter(question__startswith='What')
>
>
> This 'question__startswith' is the problem. What is the common idiom for
> this type od arguments, so I can Google it?
It's a named argument - in Python we usually name them keyword args.
http://docs.python.org/tut/node6.html#SECTION006720000000000000000
> I understand what this filter
> is suppose to do, but don't know how it is done (this separation of Poll
> atribute and startwith function).
>
Why don't you just read the source code ? Django is free software, you
know !-)
What about something like:
def filter(self, **kw):
for argname, value in kw.items():
fieldname, op = argname.split('__', 1)
assert fieldname in self.fields
# build the query here
# etc...
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