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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def make_value_from_datastore(self, value):
 """Convert value from datastore representation. Args: value: datastore value. Returns: value to store in the model. """


    if value is None:
      return None
    _json = json.loads(value, cls=JsonDecoder)
    if self.data_type == dict:
      return _json
    return self.data_type.from_json(_json)