import numpy as np
import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D
from matplotlib.animation import FuncAnimation

t = np.linspace(0, 20*np.pi, 1000)
x = t
y = np.cos(t)
z = np.sin(t)

def animate(i, *fargs):
    x, y, z = fargs[0:3]
    ln = fargs[3]
    # Plot small ball at time t[i]
    ln.set_data_3d([x[i]], [y[i]], [z[i]])
    ln.set_color('r')
    ln.set_marker('.')
    ln.set_markersize(10)
    return ln,

fig = plt.figure(figsize=(9,7))
ax = plt.axes(projection='3d')
fix_ln = ax.plot(x, y, z, 'b-')[0]
ln = ax.plot([], [], [])[0]

ani = FuncAnimation(fig, animate, frames=np.arange(t.size), repeat=False, fargs=(x, y, z, ln), interval=0, blit=True)
# Comment the two following lines to play animation without callbacks:
plt.connect('button_press_event', lambda event: ani.event_source.stop())
plt.connect('button_release_event', lambda event: ani.event_source.start())
plt.show()