human
Solve the following python programming problem given the following code:
def invoke(self, method, * args) : 
    ' Invoke a method (with arguments) on every item in a collection.
        ' 
    def inv(value, * ar) : 
        if (_ (method).isFunction () or _ (method).isLambda () or _ (method).isMethod ()) : 
            return method (value, * args) 
else : 
            return getattr (value, method) (* args) 
return self._wrap (self._clean.map (method)) 

    
    

    Fix the buggy line: return self._wrap (self._clean.map (method))
assistant
#Here is Python program to fix the buggy line: return self.

return self._wrap (self._clean.map (def inv())