code: def get_as_float_with_default(self, key, default_value):
          
          value = self.get(key)
          return FloatConverter.to_float_with_default(value, default_value)
docs: Converts map element into a float or returns default value if conversion is not possible.
  
          :param key: an index of element to get.
  
          :param default_value: the default value
  
          :return: float value ot the element or default value if conversion is not supported.