How to connect back to back line plots using a dashed line?

Question

I have two datasets covering two different time periods which are back to back. One dataset goes from 0 to 87 and other goes from 88 to 100. Please see below. How do I connect those datasets using a dashed or any distinct line?

My code is as follows:

plt.plot(np.exp(ARIMA.fit.predict(start=88,end=100,dynamic=True)), color = 'red')
plt.plot(np.exp(original_data), color = 'blue')

Answer 1

I would probably be lazy and do it like this :

fit_array = np.exp(ARIMA.fit.predict(start=88,end=100,dynamic=True))
long_array = np.concatenate([np.exp(original_data), fit_array])

plt.plot(long_array, color = 'blue')
plt.plot(fit_array, color = 'red')

plot the long blue line, which will connect all the points, and then plot the prediction on top.