Get the list of figures in matplotlib

I would like to:

pylab.figure()
pylab.plot(x)
pylab.figure()
pylab.plot(y)
# ...
for i, figure in enumerate(pylab.MagicFunctionReturnsListOfAllFigures()):
  figure.savefig('figure%d.png' % i)

What is the magic function that returns a list of current figures in pylab?

Websearch didn't help...