Re: Runserver Error (Exceptions) in Latest Django Dev Version with Python 3.3

On Fri, Jan 3, 2014 at 9:32 AM, Noah Fang <noah.ark@gmail.com> wrote:

Django newbie here. I just checked out and installed the latest dev version as instructed and created a project, but when trying to "python manage.py runserver", it gives the following error message.

Anyone has any clue? Huge thanks!

$ python manage.py runserver

Traceback (most recent call last):

  File "/Users/noahark/Dev/django-trunk/django/apps/base.py", line 66, in create

    module = import_module(entry)

  File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/importlib/__init__.py", line 90, in import_module

    return _bootstrap._gcd_import(name[level:], package, level)

  File "<frozen importlib._bootstrap>", line 1584, in _gcd_import

  File "<frozen importlib._bootstrap>", line 1565, in _find_and_load

  File "<frozen importlib._bootstrap>", line 1532, in _find_and_load_unlocked

  File "<frozen importlib._bootstrap>", line 584, in _check_name_wrapper

  File "<frozen importlib._bootstrap>", line 1022, in load_module

  File "<frozen importlib._bootstrap>", line 1003, in load_module

  File "<frozen importlib._bootstrap>", line 560, in module_for_loader_wrapper

  File "<frozen importlib._bootstrap>", line 868, in _load_module

  File "<frozen importlib._bootstrap>", line 313, in _call_with_frames_removed

  File "/Users/noahark/Dev/django-trunk/django/contrib/admin/__init__.py", line 5, in <module>

    from django.contrib.admin.options import ModelAdmin, HORIZONTAL, VERTICAL

  File "/Users/noahark/Dev/django-trunk/django/contrib/admin/options.py", line 31, in <module>

    from django.shortcuts import get_object_or_404

ImportError: bad magic number in 'django.shortcuts': b'\x03\xf3\r\n'

This error is a bit of a red flag -- it means that you've got mixed Python byte code versions. Somehow, you've generated byte code using one version of Python, and you're then running the code using a different version of Python.

Unfortunately, I have *no* idea how you might have caused this problem. It looks like you're running on a Mac, so it's possible that the system is getting confused over whether system python is Python 3 or Python 2 -- you're invoking "python manage.py runserver" at the command line and getting Python 3, but if some quirk of your environment is causing Python 2 to be the system default somewhere, you will get problems.

My suggestion here is to make sure you're running your code in a virtualenv [1] -- that will make sure that the "local" Python is always clear. Using virtualenv is good practice anyway for Python development, because it isolates the dependencies of each project from each other. 

[1] http://www.virtualenv.org/en/latest/

Yours,

Russ Magee %-)

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