On 01/28/2016 02:15 PM, ast wrote:
hello
Here is a class from django framework
from django.db import models
class Article(models.Model):
titre = models.CharField(max_length=100)
auteur = models.CharField(max_length=42)
contenu = models.TextField(null=True)
date = models.DateTimeField(auto_now_add=True, auto_now=False,
verbose_name="Date de parution")
def __str__(self):
return self.titre
From a Python point of view, what are titre, auteur, contenu and date ?
Are they class attributes, so common to all instance of Article ?
It seems so to me.
But if i do in a django shell (run with py manage.py shell)
Article.titre
it doesnt work,
AttributeError: type object 'Article' has no attribute 'titre'
why ?
if I test on a small class
class MyClass:
i=0
MyClass.i
0
works
When we create an object of class Article
article = Article(titre="Bonjour", auteur="Maxime")
article.contenu = "Les crêpes bretonnes sont trop bonnes !"
we use the same names titre, auteur, contenu, which should be instance
attribute this time. This is confusing to me
thx
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.
jm
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