matplotlib: Difference between Axes and AxesSubplot

[ast]

Hello

It's not clear to me what the differences between
Axes and AxesSubplot classes are

AxesSubplot is a sub class of Axes

It is possible to draw in objects of both type with
plot, scatter ...

Axes object seems to be able to be inserted in AxesSubplot object
(It is strange because AxesSubplot is a sub class of Axes)

Here is a piece of code using both.

import matplotlib.pyplot as pyplot

figure = pyplot.figure()
axes = figure.add_subplot(111) # Renvoie un objet AxesSubplot, sous 
classe de Axes
axes.scatter(range(5), [x ** 2 for x in range(5)])
axes.set_xlim(0, 4)
axes.set_xlabel('axe des x')
axes2 = figure.add_axes([0.3, 0.5, 0.3, 0.3]) # renvoie un objet Axes
axes2.patch.set_color('lightyellow')
axes2.plot(range(5), range(5))

and the figure it produces:

http://www.python-simple.com/img/img32.png