def changed_fields(self):
        return (set(self.changed_data) -
                set(['admin_log', 'notifications', 'photo',
                     'password', 'password2', 'oldpassword']))
Returns changed_data ignoring these fields.
dataset/ETHPy150Open mozilla/addons-server/src/olympia/users/forms.py/BaseAdminUserEditForm.changed_fields