input: Write a function to predict the next day's forecast temperature using the exponential smoothing algorithm given the past three day's forecast temperatures. The function should take a list of three temperatures as input and return the predicted temperature.
  
  def predict_temperature(temperature_list):
      alpha = 0.5 #Confidence value
      predicted_temperature = temperature_list[-1] # Initializing prediction
      for temperature in temperature_list[:-1]:
          predicted_temperature = alpha*temperature + (1-alpha)*predicted_temperature
      return predicted_temperature
  
  assert predict_temperature([21, 22, 20])==21.0
  assert predict_temperature([23, 24, 25])==24.5
  assert predict_temperature([20, 20, 20])==20.0
  assert predict_temperature([18, 20, 22])==20.0
  assert predict_temperature([25, 24, 23])==23.5
output: def predict_temperature(temperature_list):
      alpha = 0.5 #Confidence value
      predicted_temperature = temperature_list[-1] # Initializing prediction
      for temperature in temperature_list[:-1]:
          predicted_temperature = alpha*temperature + (1-alpha)*predicted_temperature
      return predicted_temperature