Animation from matplotlib not working in spyder

I'm new to both python and stackoverflow, and I'm going over examples at matplotlib. I've searched for the solution to this problem with no luck, although I was able to locate a previously unanswered question in stackoverflow with the same issue.

Basically, I copied the code available from the examples at matplotlib; for instance:

import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation
def data_gen(t=0):
    cnt = 0
    while cnt < 1000:
        cnt += 1
        t += 0.1
        yield t, np.sin(2*np.pi*t) * np.exp(-t/10.)
def init():
    ax.set_ylim(-1.1, 1.1)
    ax.set_xlim(0, 10)
    del xdata[:]
    del ydata[:]
    line.set_data(xdata, ydata)
    return line,

fig, ax = plt.subplots()
line, = ax.plot([], [], lw=2)
ax.grid()
xdata, ydata = [], []


def run(data):
    # update the data
    t, y = data
    xdata.append(t)
    ydata.append(y)
    xmin, xmax = ax.get_xlim()

    if t >= xmax:
        ax.set_xlim(xmin, 2*xmax)
        ax.figure.canvas.draw()
    line.set_data(xdata, ydata)

    return line,

ani = animation.FuncAnimation(fig, run, data_gen, blit=False, interval=10,
                          repeat=False, init_func=init)
plt.show()

I've run various animation examples in both Anaconda 2 (python 2.7) & 3 (python 3.5), and both give me a blank plot without animation. However, each animation works perfectly well in Enthought Canopy.

Is there something simple I'm missing when using spyder?