code: def upper_band(close_data, high_data, low_data, period):
      
      cb = center_band(close_data, high_data, low_data, period)
      bw = band_width(high_data, low_data, period)
      ub = cb + bw
      return ub
docs: Upper Band.
  
      Formula:
      UB = CB + BW