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Python Django Basics Django Templates Templates

Cannot run manage.py file

Hello Try to run the server with virtual venv The terminal report error that:

(base) OSX-MacBook-Pro:learning_site osx$ source mysitevenv/bin/activate
(mysitevenv) (base) OSX-MacBook-Pro:learning_site osx$ python3 manage.py runserver
Traceback (most recent call last):
  File "manage.py", line 8, in <module>
    from django.core.management import execute_from_command_lineModuleNotFoundError: No module named 'django'
(mysitevenv) (base) OSX-MacBook-Pro:learning_site osx$ pwd
/Users/osx/Downloads/Django Basics 2/s5v1/learning_site(mysitevenv) (base) OSX-MacBook-Pro:learning_site osx$ ls
assets          learning_site   mysitevenv
courses         manage.py       templates(mysitevenv) (base) OSX-MacBook-Pro:learning_site osx$ python manage.py runserver
Traceback (most recent call last):
  File "manage.py", line 8, in <module>
    from django.core.management import execute_from_command_line
ModuleNotFoundError: No module named 'django'
(mysitevenv) (base) OSX-MacBook-Pro:learning_site osx$ python -m pip install --upgrade pip
Collecting pip
  Using cached https://files.pythonhosted.org/packages/30/db/9e38760b32e3e7f40cce46dd5fb107b8c73840df38f0046d8e6514e675a1/pip-19.2.3-py2.py3-none-any.whl
Installing collected packages: pip
  Found existing installation: pip 19.0.3
    Uninstalling pip-19.0.3:
(mysitevenv) (base) OSX-MacBook-Pro:learning_site osx$ python mange.py runserver
/Library/Frameworks/Python.framework/Versions/3.7/Resources/Python.app/Contents/MacOS/Pytho
n: can't open file 'mange.py': [Errno 2] No such file or directory
(mysitevenv) (base) OSX-MacBook-Pro:learning_site osx$ python manage.py runserver
Watching for file changes with StatReloader
Exception in thread django-main-thread:
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/threading.py", line
 926, in _bootstrap_inner
    self.run()
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/threading.py", line
 870, in run
    self._target(*self._args, **self._kwargs)
  File "/Users/osx/Downloads/Django Basics 2/s5v1/learning_site/mysitevenv/lib/python3.7/si
te-packages/django/utils/autoreload.py", line 54, in wrapper
    fn(*args, **kwargs)
  File "/Users/osx/Downloads/Django Basics 2/s5v1/learning_site/mysitevenv/lib/python3.7/site-packages/django/core/management/commands/runserver.py", line 109, in inner_run
    autoreload.raise_last_exception()
  File "/Users/osx/Downloads/Django Basics 2/s5v1/learning_site/mysitevenv/lib/python3.7/site-packages/django/utils/autoreload.py", line 77, in raise_last_exception
    raise _exception[1]
  File "/Users/osx/Downloads/Django Basics 2/s5v1/learning_site/mysitevenv/lib/python3.7/site-packages/django/core/management/__init__.py", line 337, in execute
    autoreload.check_errors(django.setup)()
  File "/Users/osx/Downloads/Django Basics 2/s5v1/learning_site/mysitevenv/lib/python3.7/site-packages/django/utils/autoreload.py", line 54, in wrapper
    fn(*args, **kwargs)
  File "/Users/osx/Downloads/Django Basics 2/s5v1/learning_site/mysitevenv/lib/python3.7/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/Users/osx/Downloads/Django Basics 2/s5v1/learning_site/mysitevenv/lib/python3.7/site-packages/django/apps/registry.py", line 114, in populate
    app_config.import_models()
  File "/Users/osx/Downloads/Django Basics 2/s5v1/learning_site/mysitevenv/lib/python3.7/site-packages/django/apps/config.py", line 211, in import_models
    self.models_module = import_module(models_module_name)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/Users/osx/Downloads/Django Basics 2/s5v1/learning_site/courses/models.py", line 13, in <module>
    class Step(models.Model):
  File "/Users/osx/Downloads/Django Basics 2/s5v1/learning_site/courses/models.py", line 17, in Step
    course = models.ForeignKey(Course)
TypeError: __init__() missing 1 required positional argument: 'on_delete'

1 Answer

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,457 Points

The last few lines point to the error:

File "/Users/osx/Downloads/Django Basics 2/s5v1/learning_site/courses/models.py", line 13, in <module>
    class Step(models.Model):
  File "/Users/osx/Downloads/Django Basics 2/s5v1/learning_site/courses/models.py", line 17, in Step
    course = models.ForeignKey(Course)
TypeError: __init__() missing 1 required positional argument: 'on_delete'

In models.py, the class Step uses a ForeignKey reference without the required argument ’on_delete’

Post back if you need more help. Good luck!!!