Invalid properties don't throw errors?

I'm stumped.

I have a Django project that's fairly far along--I'm able to use it internally.

A few days ago while trying to debug a function, I noticed I was settings a property incorrectly.

Python 2.7.3 (default, Aug  1 2012, 05:14:39) 

[GCC 4.6.3] on linux2

Type "help", "copyright", "credits" or "license" for more information.

(InteractiveConsole)

>>> u = User.objects.get(pk=1)

>>> u.user = 'test'

>>> 

No error.  It should be 'u.username'.

So I tried a few more.

Python 2.7.3 (default, Aug  1 2012, 05:14:39) 

[GCC 4.6.3] on linux2

Type "help", "copyright", "credits" or "license" for more information.

(InteractiveConsole)

>>> u = User.objects.get(pk=1)

>>> u.sdbgnois74gn = 'test'

>>> 

No error is thrown for trying to set an invalid property.

I tried blowing away my virtualenv and reinstalling.  Same issue.

Passing invalid parameters while creating a new object throws errors, but not after the object is created.

>>> django.VERSION

(1, 4, 2, 'final', 0)

>>> c = Company(doesnotexist='123')

Traceback (most recent call last):

  File "<console>", line 1, in <module>

  File "/home/aaron/.virtualenvs/tapp/local/lib/python2.7/site-packages/django/db/models/base.py", line 367, in __init__

    raise TypeError("'%s' is an invalid keyword argument for this function" % kwargs.keys()[0])

TypeError: 'doesnotexist' is an invalid keyword argument for this function

>>> c = Company(name='123')

>>> c.doesnotexist = '123'

>>>

I have never witnessed this behavior before in python.  Any pointers on where I should start digging?

-A

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