Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #102191

Re: class attribute

Show all headers | View raw

On Thu, Jan 28, 2016 at 9:56 AM, Chris Angelico <rosuav@gmail.com> wrote:

> On Fri, Jan 29, 2016 at 12:56 AM, jmp <jeanmichel@sequans.com> wrote:
> > My guess is that models.Model has a metclass. Without going too much int
> > details, the metaclass may change the class structure when it's created.
> >
> > django is very specific and very database oriented.
> >
> > "
> > article = Article(titre="Bonjour", auteur="Maxime")
> > article.contenu = "Les crêpes bretonnes sont trop bonnes !"
> > "
> >
> > this is probably the wrong way to assign a value to 'contenu'. You should
> > have a look at django help files, from what I remember it's very well
> > documented with a lot of examples.
> >
>
> I suspect Django's using the descriptor protocol or other magic here.
> SQLAlchemy works in a similar way; when you create the class, you put
> a bunch of attributes on it to specify columns, and then you can
> simply assign to those attributes on an instance to set the values for
> a row to be saved to the database.
>
> As Todd explains in further detail, the metaclass gets to do whatever it
> likes.
>
> ChrisA
> --
> https://mail.python.org/mailman/listinfo/python-list
>

There is an excellent django book: http://prodjango.com/

There is a section that explains how models are created.  Its a great and
clear read.

-- 
Joel Goldstick
http://joelgoldstick.com/stats/birthdays

Back to comp.lang.python | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

class attribute "ast" <nomail@invalid.com> - 2016-01-28 14:15 +0100
  Re: class attribute jmp <jeanmichel@sequans.com> - 2016-01-28 14:56 +0100
  Re: class attribute Todd Dembrey <todd.dembrey@gmail.com> - 2016-01-28 14:13 +0000
  Re: class attribute "ast" <nomail@invalid.com> - 2016-01-28 15:24 +0100
  Re: class attribute Chris Angelico <rosuav@gmail.com> - 2016-01-29 01:56 +1100
  Re: class attribute Joel Goldstick <joel.goldstick@gmail.com> - 2016-01-28 11:04 -0500

csiph-web