Bug report

Bug summary

When using matplotlib.animation.FuncAnimation with a generator and without specifying save_count, a default value of save_count=100 is used. Instead, the generator should be run until it raises a StopIteration exception.

Code for reproduction

import numpy as np
from matplotlib.animation import FuncAnimation

def get_frames():
    t = 0.0
    x = np.linspace(0, 2*np.pi, 100)
    l, = plt.plot(x, np.sin(x+t))
    txt = plt.title("")
    yield l,  # Initial frame... not stored
    for nt, t in enumerate(np.linspace(0,2*np.pi, 200)):
        l.set_data(x, np.sin(x+t))
        txt.set_text("frame: {}".format(nt))
        yield l,
        
anim = FuncAnimation(plt.gcf(), lambda artists:artists, frames=get_frames())

# To view, use a notebook for example
from IPython.display import HTML
HTML(anim.to_html5_video())

Actual outcome

Only frames 0 to 99 are drawn even though the generator will produce 200 frames (up to 199).

Expected outcome

An animation that runs until the generator raises StopIteration.

Matplotlib version

It looks like this will affect the latest version on GitHub. I tested this with version 1.5.3 from anaconda.