How to plot two list in the same graph, but with different colors?

Question

Please, help me to plot two lists on the same graph. The lines should be of different colors. Here is the code I tried:

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()

Answer 1

You should use plt.plot twice to plot two lines.

I don't know what is your X axis but obviously you should create another array/list to be your X value.

Then use plt.plot(x_value,forecast, c='color-you-want') and plt.plot(x_value,train_z, c='another-color-you-want').

. Please refer to the pyplot documentation for more details.

Answer 2

import matplotlib.pyplot as plt
plt.plot([1,2,3,4,12,15],'g*', [1,4,9,16], 'ro')
plt.show()

It's very easy, Hope this sample code will help.