Deprecated in matplotlib 1.4, error in matplotlib 1.5

[nanounanue]

When you execute the code of chapter 2 of plotting several artificial datasets:

def plot_artificial_sms_dataset():
    tau = pm.rdiscrete_uniform(0, 80)
    alpha = 1. / 20.
    lambda_1, lambda_2 = pm.rexponential(alpha, 2)
    data = np.r_[pm.rpoisson(lambda_1, tau), pm.rpoisson(lambda_2, 80 - tau)]
    plt.bar(np.arange(80), data, color="#348ABD")
    plt.bar(tau - 1, data[tau - 1], color="r", label="user behaviour changed")
    plt.xlim(0, 80)

figsize(12.5, 5)
plt.title("More example of artificial datasets")
for i in range(4):
    plt.subplot(4, 1, i)
    plot_artificial_sms_dataset()

and you are using matplotlib 1.4.3 you get this warning:

/usr/local/lib/python2.7/dist-packages/matplotlib/axes/_subplots.py:69: MatplotlibDeprecationWarning: The use of 0 (which ends up being the _last_ sub-plot) is deprecated in 1.4 and will raise an error in 1.5
  mplDeprecation)

but only the first time.

You could fix it changing the line of the for to

for i in range(1,5): # I know, it looks ugly...