django-stdimage NoneType problem

[Oscar Carballal]

Hi,

I'm starting to port my project (e-cidadania) into python 3 and django 1.6rc1, but I'm currently facing a problem that I can't understand.

When I try to do a runserver or a syncdb or any other command, it breaks with this message:

➜  src git:(python3) ✗ ./manage.py syncdb

TypeError: 'NoneType' object is not callable

This is the full traceback:

➜  src git:(python3) ✗ ./manage.py syncdb --traceback

Traceback (most recent call last):

  File "/usr/lib/python3.3/site-packages/django/core/management/base.py", line 222, in run_from_argv

    self.execute(*args, **options.__dict__)

  File "/usr/lib/python3.3/site-packages/django/core/management/base.py", line 254, in execute

    self.validate()

  File "/usr/lib/python3.3/site-packages/django/core/management/base.py", line 280, in validate

    num_errors = get_validation_errors(s, app)

  File "/usr/lib/python3.3/site-packages/django/core/management/validation.py", line 35, in get_validation_errors

    for (app_name, error) in get_app_errors().items():

  File "/usr/lib/python3.3/site-packages/django/db/models/loading.py", line 166, in get_app_errors

    self._populate()

  File "/usr/lib/python3.3/site-packages/django/db/models/loading.py", line 72, in _populate

    self.load_app(app_name, True)

  File "/usr/lib/python3.3/site-packages/django/db/models/loading.py", line 96, in load_app

    models = import_module('.models', app_name)

  File "/usr/lib/python3.3/site-packages/django/utils/importlib.py", line 35, in import_module

    __import__(name)

  File "/usr/lib/python3.3/site-packages/guardian/models.py", line 89, in <module>

    User = get_user_model()

  File "/usr/lib/python3.3/site-packages/django/contrib/auth/__init__.py", line 127, in get_user_model

    user_model = get_model(app_label, model_name)

  File "/usr/lib/python3.3/site-packages/django/db/models/loading.py", line 230, in get_model

    self._populate()

  File "/usr/lib/python3.3/site-packages/django/db/models/loading.py", line 72, in _populate

    self.load_app(app_name, True)

  File "/usr/lib/python3.3/site-packages/django/db/models/loading.py", line 96, in load_app

    models = import_module('.models', app_name)

  File "/usr/lib/python3.3/site-packages/django/utils/importlib.py", line 35, in import_module

    __import__(name)

  File "/home/oscarcp/devel/cidadania/ecidadania/src/core/spaces/models.py", line 31, in <module>

    class Space(models.Model):

  File "/home/oscarcp/devel/cidadania/ecidadania/src/core/spaces/models.py", line 56, in Space

    blank=True, null=True)

  File "/home/oscarcp/devel/cidadania/ecidadania/src/core/spaces/fields.py", line 129, in __init__

    setattr(self, att_name, dict(map(None, params_size, att)))

TypeError: 'NoneType' object is not callable

I though it might be a problem from django-stdimage, but doing an ipdb over the affected code returned this:

ipdb> n

TypeError: 'NoneType' object is not callable

> /home/oscarcp/devel/cidadania/ecidadania/src/core/spaces/models.py(31)<module>()

     30 

---> 31 class Space(models.Model):

     32 

Anyone has a clue of where could be the problem? The code runs just fine with python 2.7.5 and django 1.5.5

[Russell Keith-Magee]

Hi Oscar,

The error you describe is the sort of thing that happens when a comma goes missing, particularly in a list of tuples, but it's possible in other circumstances, too.

Take the following code as an example:

x = [

  None

  (4, 5, 6)

]

On first inspection, this looks fine -- a list that contains a None and a  tuple. But then you notice that there's no comma after the None -- so what you're asking Python to do is to invoke None as a function, using (4,5,6) as arguments. This causes a "NoneType object is not callable" error. 

In your case, the problem isn't manifesting at the raw syntactic level. I'm not entirely sure how the setattr call you describe could be used to generate this error, however. 

Unfortunately, its difficult to provide any more advice beyond this without knowing more about your code. The error is being raised in your own code space, so it isn't strictly a problem that Django itself is causing -- at best, it's an interaction between your code's expectations and what Django is actually returning. If you're depending on some internal value in Django's meta classes, and that value changed between 1.5.5 and 1.6rc1, then it's possible you might start getting errors. 

I wouldn't read too much into where ipdb stops -- if you look at the stack, it's stopped at the first frame in your own code (2 frames up from where ./manage.py dumped stack). 

Yours,

Russ Magee %-)

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[Oscar Carballal]

Thanks Russell, I actually see a comma after the None... I'm not sure what you're referring to.

Well, it's an opensource project, so here you go :) https://github.com/cidadania/e-cidadania

The affected code is located here (both fields.py and models.py) https://github.com/cidadania/e-cidadania/tree/master/src/core/spaces

Actually you're right, but even then ipdb doesn't show a very helpful output. I'm putting it in a pastebin to avoid cluttering the mail: https://dpaste.de/asTw

2013/10/30 Russell Keith-Magee <rus...@keith-magee.com>

To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/CAJxq84_TrUXZBkt09G29B3cpFuJ4wk%3DbL2-TKt6pP21%2BEpP6dQ%40mail.gmail.com.

[Oscar Carballal]

Oops, sorry Russell, the affected code is here (branch mistake): https://github.com/cidadania/e-cidadania/blob/python3/src/core/spaces/models.py

2013/10/30 Oscar Carballal <piz...@gmail.com>