Cannot close matplot figure

[landlord1984]

I thought it should be easy, but I couldn't get to close my figure.

My code:

import matplotlib.pyplot as plt
x=[1,2,3]
y=[5,7,4]
x2=[1,2,3]
y2=[10,14,12]
plt.plot(x,y,label="First Line")
plt.plot(x2,y2,label='Second Line')
plt.xlabel('Plot Number')
plt.ylabel('Important var')
plt.title('Interesting Graph\nCheck it out')
plt.legend()
plt.show()
plt.close()