PIL PSDraw textsize method

[Bauke Veenstra]

Running the example from the excellent PIL handbook gives an error,
after these two lines:
ps.setfont("HelveticaNarrow-Bold", 36)
w, h, b = ps.textsize(title)
AttributeError: PSDraw instance has no attribute 'textsize'

Can someone tell me what's wrong, this error occurred on my Linux and on
my Windows system.

Regards,
Bauke