Traceback (most recent call last):
  File "manage.py", line 15, in <module>
  execute_from_command_line(sys.argv)
  File "C:\Users\lislis\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django-2.0-py3.5.egg\django\core\management\__init__.py", line 354, in execute_from_command_line
  utility.execute()
  File "C:\Users\lislis\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django-2.0-py3.5.egg\django\core\management\__init__.py", line 330, in execute
  django.setup()
  File "C:\Users\lislis\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django-2.0-py3.5.egg\django\__init__.py", line 24, in setup
  apps.populate(settings.INSTALLED_APPS)
  File "C:\Users\lislis\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django-2.0-py3.5.egg\django\apps\registry.py", line 112, in populate
  app_config.import_models()
  File "C:\Users\lislis\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django-2.0-py3.5.egg\django\apps\config.py", line 198, in import_models
  self.models_module = import_module(models_module_name)
  File "C:\Users\lislis\AppData\Local\Programs\Python\Python35-32\lib\importlib\__init__.py", line 126, in import_module
  return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 986, in _gcd_import
  File "<frozen importlib._bootstrap>", line 969, in _find_and_load
  File "<frozen importlib._bootstrap>", line 958, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 673, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 665, in exec_module
  File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
  File "C:\Users\lislis\Django\mon_site\blog\models.py", line 6, in <module>
  class Article(models.Model):
  File "C:\Users\lislis\Django\mon_site\blog\models.py", line 16, in Article
  categorie = models.ForeignKey('Categorie')
 TypeError: __init__() missing 1 required positional argument: 'on_delete'

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 django.db import models
 
 # Create your models here.
 class Categorie(models.Model):
  nom = models.CharField(max_length=30)
 
  def __str__(self):
  return self.nom
 
 
 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"
  )
  categorie = models.ForeignKey('Categorie')
 
  def __str__(self):
  return self.titre