newforms.Form.clean_data is not read-only

[jfindlay@…]

Is it possible to make newforms.Form.clean_data immutable? I'm kind of surprised it isn't, but I don't know the meaning or purpose of all things.

$ python manage.py shell
Python 2.4.4c1 (#2, Oct 11 2006, 21:51:02)
[GCC 4.1.2 20060928 (prerelease) (Ubuntu 4.1.1-13ubuntu5)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)

from django import newforms
class form(newforms.Form):

... a = newforms.IntegerField()
... b = newforms.CharField()
...

d = {'a': 1, 'b': 'field b'}
f = form(d)
f.is_valid()

True

f.clean_data

{'a': 1, 'b': u'field b'}

f.clean_dataa = 2
f.clean_data

{'a': 2, 'b': u'field b'}