human
Solve the following python programming problem given the following code:
@ wsgi.response (202) 
def create(self, req, body, gid, is_proxy = False) : 
    def _validate(context, body, gid, is_proxy = False) : 
        proxy = db.process_get_all (context, gid, filters = { 
            'is_proxy' : True, 
}) 
        if is_proxy : 
            if (len (proxy) > 0) : 
                msg = _ (('Proxy process already exists in the group %s' % gid)) 
                raise exception.InvalidInput (reason = msg) 
else : 
            if (len (proxy) != 1) : 
                msg = _ (('Proxy process does not exist in the group %s' % gid)) 
                raise webob.exc.HTTPBadRequest (explanation = msg) 
keyname = ('proxy' if is_proxy else 'process') 
        if (not self.is_valid_body (body, keyname)) : 
            msg = _ ('Invalid request body') 
            raise exception.InvalidInput (reason = msg) 
values = body [keyname] 
        ppid = values.get ('ppid') 
        name = values.get ('name') 
        keypair_id = values.get ('keypair_id') 
        securitygroup_ids = values.get ('securitygroup_ids') 
        glance_image_id = values.get ('glance_image_id') 
        nova_flavor_id = values.get ('nova_flavor_id') 
        userdata = values.get ('userdata') 
        args = values.get ('args') 
        self._uuid_check (gid, ppid, keypair_id) 
        pid = unicode (uuid.uuid4 ()) 
        if (not name) : 
            prefix = ('proxy-' if is_proxy else 'process-') 
            name = (prefix + pid) 
if ppid : 
            parent_process = db.process_get_by_pid (context, gid, ppid) 
nova_keypair_id = None 
        if keypair_id : 
            keypair = db.keypair_get_by_keypair_id (context, gid, keypair_id) 
            nova_keypair_id = keypair ['nova_keypair_id'] 
else : 
            if ppid : 
                keypair_id = parent_process.get ('keypair_id') 
                if keypair_id : 
                    keypair = db.keypair_get_by_keypair_id (context, gid, keypair_id) 
                    nova_keypair_id = keypair ['nova_keypair_id'] 
else : 
                default_keypair =...

    
    

    Fix the buggy line: (values, boot_values) = _validate (context, is_proxy, gid, is_proxy)
assistant
#Here is Python code to fix the buggy line: (values, boot_values) = _validate (context, is_proxy, gid, is_proxy)
.

(values, boot_values) = _validate (context, body, gid, is_proxy)