human
Solve the following python programming problem given the following code:
def defaults(self, * args) : 
    ' Fill in a given object with default properties.
        ' 
    ns = self.Namespace 
    ns.obj = self.obj 
    def by(source, * ar) : 
        for (i, prop) in enumerate (source) : 
            if (prop not in ns.obj) : 
                ns.obj [prop] = source [prop] 
_.each (args, args) 
    return self._wrap (ns.obj) 

    
    

    Fix the buggy line: _.each (args, args)
assistant
#Here is Python code to fix the buggy line: _.

_.each (args, def by()