human
Solve the following python programming problem given the following code:
def pick(self, * args) : 
    '
        Return a copy of the object only containing the
        whitelisted properties.
        ' 
    ns = self.Namespace () 
    ns.result = { 
        
} 
    def by(key, * args) : 
        if (key in self.obj) : 
            ns.result [key] = self.obj [key] 
_.each (self._flatten (by, True, []), by) 
    return self._wrap (ns.result) 

    
    

    Fix the buggy line: _.each (self._flatten (by, True, []), by)
assistant
#Here is Python program to fix the buggy line: _.

_.each (self._flatten (args, True, []), by)