Python 2.4b1 (but also 2.3 and ...)
In the documentation for pdb, section 9.1 Debugger
commands describes the 'pp' command as:

pp expression 
Like the "p" command, except the value of the exception
is pretty-printed using the pprint module. 

This should be:

pp expression 
Like the "p" command, except the value of the
_expression_ is pretty-printed using the pprint module.