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import numpy as np

import matplotlib.pyplot as plt

func = np.poly1d(np.array([1, 2, 3, 4]).astype(float))

x = np.linspace(-10, 10, 30)

y = func(x)

func1 = func.deriv(m=1)

y1 = func1(x)

func2 = func.deriv(m=2)

y2 = func2(x)

plt.subplot(311)

plt.plot(x, y, 'r-')

plt.title("Polynomial")

plt.subplot(312)

plt.plot(x, y1, 'b^')

plt.title("First Derivative")

plt.subplot(313)

plt.plot(x, y2, 'go')

plt.title("Second Derivative")

plt.xlabel('x')

plt.ylabel('y')

plt.show()