import matplotlib.pyplot as plt
import numpy as np

x = np.array([1,2,3,4,5])
y = np.array([10,50,30,20,40])

fig = plt.figure()
plt.plot(x,y)
Out[38]: [<matplotlib.lines.Line2D at 0x1ea1e7fdc70>]

plt.clf()
plt.close(fig)