"""
A simple example of an animated plot
"""
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation

fig, ax = plt.subplots()

x = np.arange(0, 2 * np.pi, 0.01)
(line,) = ax.plot(x, np.sin(x))


def animate(i):
    line.set_ydata(np.sin(x + i / 10.0))  # update the data
    return (line,)


# Init only required for blitting to give a clean slate.
def init():
    line.set_ydata(np.ma.array(x, mask=True))
    return (line,)


ani = animation.FuncAnimation(
    fig, animate, np.arange(1, 200), init_func=init, interval=25, blit=True
)
plt.show()