human
Solve the following python programming problem given the following code:
def load(self, filename) : 
    def _datetime_parser(dct) : 
        for (key, value) in list (dct.items ()) : 
            try : 
                dct [key] = dtparse (value) 
except Exception : 
                pass 
return dct 
with open (filename) as fin : 
        return json.load (fin, object_hook = <MASK>) 
    
    Given the code above, what is a proper replacement for <MASK>?
assistant
#Here is a proper replacement for <MASK>.
def _datetime_parser(