Why all labels are not showing properly in matplotlib?

Question

When I am executing the below code, I can see the Demo is printing at the top horizontally. The Demo2 prints inside the plot with dotted line. But I can't see theDemo1? Why Demo1 is not printing and why Demo is coming top horizontally?

import matplotlib.pyplot as plt    
x = [1,2,3,4,5,-1-2]
y = [-1,5, 100, -2, 50, 100]
t = [100, 110, 120, 130, 140, 150]
plt.figure()

ax1 = plt.subplot(3, 1, 1)
plt.title('Demo');
ax1.plot(t,x, 'b.:', label="Demo") # Showing top Horizontal 

ax2 = plt.subplot(3, 1, 2, sharex=ax1)
ax2.plot(t,y, 'b.:', label="Demo1") # Not showing up

ax3 = plt.subplot(3, 1, 3, sharex=ax1)
ax3.plot(t,t, 'b.:', label="Demo2") # This is perfect how I wanted

plt.legend()
plt.show()

Answer 1

You could use plt.figlegend() instead, which will give you output like this

Or call plt.legend() after each plot to add the legend to each subplot individually,

import matplotlib.pyplot as plt    
x = [1,2,3,4,5,-1-2]
y = [-1,5, 100, -2, 50, 100]
t = [100, 110, 120, 130, 140, 150]
plt.figure()

ax1 = plt.subplot(3, 1, 1)
plt.title('Demo');
ax1.plot(t,x, 'b.:', label="Demo") # Showing top Horizontal 
plt.legend()

ax2 = plt.subplot(3, 1, 2, sharex=ax1)
ax2.plot(t,y, 'b.:', label="Demo1") # Not showing up
plt.legend()

ax3 = plt.subplot(3, 1, 3, sharex=ax1)
ax3.plot(t,t, 'b.:', label="Demo2") # This is perfect how I wanted
plt.legend()
plt.show()

If that's not exactly what you want there are other methods outlined in the answers to this question