Use matplotlib:
import numpy as np
import matplotlib.pyplot as plt
x = np.linspace(-5, 5)
y1 = x*x
y2 = x**1.5
plt.plot(x, y1)
plt.plot(x, y2, 'r--') # Optional linestyle: 'r--' means dashed red line
plt.xlabel('X')
plt.ylabel('Y')
plt.legend(['$X^2$', '$X^{1.5}$'], loc='upper center')
plt.title('Function Plotting!')
plt.show()
