code: def calculate_temperature_equivalent(temperatures):
      
  
      ret = 0.6*temperatures + 0.3*temperatures.shift(1) + 0.1*temperatures.shift(2)
      ret.name = 'temp_equivalent'
      return ret
docs: Calculates the temperature equivalent from a series of average daily temperatures
      according to the formula: 0.6 * tempDay0 + 0.3 * tempDay-1 + 0.1 * tempDay-2
  
      Parameters
      ----------
      series : Pandas Series
  
      Returns
      -------
      Pandas Series