human
Solve the following python programming problem given the following code:
def __call__(self, **k) : 
    params = dict (header = { 
        
}, query = [], path = { 
        
}, body = { 
        
}, formData = [], file = { 
        
}) 
    names = [] 
    def _convert_parameter(p) : 
        if ((p.name not in k) and (not p.is_set ('default')) and p.required) : 
            raise ValueError (('requires parameter: ' + p.name)) 
if p.is_set ('default') : 
            v = k.get (p.name, p.default) 
else : 
            if (p.name in k) : 
                v = k [p.name] 
else : 
                return 
c = p._prim_ (v, self._prim_factory) 
        i = getattr (p, 'in') 
        if (p.type == 'file') : 
            params ['file'] [p.name] = c 
else : 
            if (i in ('query', 'formData')) : 
                if isinstance (c, Array) : 
                    params [i].extend ([tuple ([p.name, v]) for v in c.to_url ()]) 
else : 
                    params [i].append ((p.name, str (c))) 
else : 
                params [i] [p.name] = (str (c) if (i != 'body') else c) 
names.append (p.name) 
for p in self.parameters : 
        _convert_parameter (final (p)) 
unknown = (set (six.iterkeys (params)) - set (names)) 
    if (len (unknown) > 0) : 
        raise ValueError ('Unknown parameters: {0}'.format (unknown)) 
return (SwaggerRequest (op = self, params = params), SwaggerResponse (self)) 

    
    

    Fix the buggy line: unknown = (set (six.iterkeys (params)) - set (names))
assistant
#Here is Python program to fix the buggy line: unknown = (set (six.

unknown = (set (six.iterkeys (k)) - set (names))