title: How to plot two list in the same graph, but with different colors?
body: <p>Please, help me to plot two lists on the same graph. The lines should be of different colors. Here is the code I tried:</p>
  
  <pre><code>import matplotlib.pyplot as plt 
  train_X = [1,2,3,4,5] 
  train_Y = [10, 20, 30, 40, 50] 
  train_Z = [10, 20, 30, 40, 50,25] 
  alpha = float(input("Input alpha: ")) 
  forecast = [] for x in range(0, len(train_X)+1):  
      if x==0:       
          forecast.append(train_Y[0])  
      else:  
          forecast.append(alpha*train_Y[x-1] + (1 - alpha) * forecast[x-1])
  plt.plot(forecast,train_Z,'g') 
  plt.show()
  </code></pre>