human
Solve the following python programming problem given the following code:
def __iter__(self) : 
    def _GetMeasurementValue(item) : 
        "Extract a single MeasurementValue's value." 
        return (item [0], item [1].value) 
return itertools.imap (<MASK>, self._values.iteritems ()) 
    
    Given the code above, what is a proper replacement for <MASK>? Choose among: self
assistant
#Here is a proper replacement for <MASK>.
def _GetMeasurementValue(