accessing pk of an existing object in ModelForm

Hello there,
For doing some sanity checks, I need the primary key (pk) of an
(already existing) object in a ModelForm.

What works for me in the meantime, ist the following (admin interface):

class NF(ModelForm):
def __init__(self,*args,**kwargs):
self._args = args
self._kwargs = kwargs
super(NF,self).__init__(*args,**kwargs)

class NA(ModelAdmin):
form = NF

and deeper in the underground in a method
I use the following for the checks.
self._kwargs.has_key('instance'):
pk = self._kwargs['instance'].pk

Now the question. Is there a more canonical form of accessing
this data ?

thanks
gregor

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