def __init__(self, *args, **kwargs):
   super(MyForm, self).__init__(*args, **kwargs)
   if not request.role == "Admin":
       self.fields['formfield'].disabled = True
   else:
       None

from django.contrib.auth.models import User
def __init__(self, user, *args, **kwargs):
   self.user = kwargs.pop('user', None)
   super(MyForm, self).__init__(*args, **kwargs)
   self.fields['formfield'].queryset = User.objects.exclude(user=myrole)