<gh_stars>0
from matplotlib import animation
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.animation import FuncAnimation

fig, ax = plt.subplots()
xdata, ydata = [], []
ln, = plt.plot([], [], 'ro')

def init():
    ax.set_xlim(0, 2 * np.pi)
    ax.set_ylim(-1, 1)
    return ln,

def update(frame):
    xdata.append(frame)
    ydata.append(np.sin(frame))
    ln.set_data(xdata, ydata)
    return ln,

writer = animation.PillowWriter(fps=30)
ani = FuncAnimation(fig, update, frames=np.linspace(0, 2 * np.pi, 128),
                    init_func=init, blit=True, repeat=True, interval=200)
ani.save("images/sin.gif", writer=writer)
plt.show()

from matplotlib import animation
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.animation import FuncAnimation

fig, ax = plt.subplots()
xdata, ydata = [], []
ln, = plt.plot([], [], 'ro')

def init():
    ax.set_xlim(0, 2 * np.pi)
    ax.set_ylim(-1, 1)
    return ln,

def update(frame):
    xdata.append(frame)
    ydata.append(np.sin(frame))
    ln.set_data(xdata, ydata)
    return ln,

writer = animation.PillowWriter(fps=30)
ani = FuncAnimation(fig, update, frames=np.linspace(0, 2 * np.pi, 128),
                    init_func=init, blit=True, repeat=True, interval=200)
ani.save("images/sin.gif", writer=writer)
plt.show()