[Tutor] problem with Python Tutorial

[Dick Moores]

Quoting from "6.2 Standard Modules", of the Python Tutorial 
(<http://www.python.org/doc/2.4/tut/node8.html#SECTION008200000000000000000>):

==================================
One particular module deserves some attention: sys, which is built into 
every Python interpreter. The variables sys.ps1 and sys.ps2 define the 
strings used as primary and secondary prompts:


 >>> import sys
 >>> sys.ps1
'>>> '
 >>> sys.ps2
'... '
 >>> sys.ps1 = 'C> '
C> print 'Yuck!'
Yuck!
C>

These two variables are only defined if the interpreter is in interactive 
mode.
========end of quote===================

I tried this with IDLE:

 >>> import sys
 >>> sys.ps1

Traceback (most recent call last):
   File "<pyshell#27>", line 1, in -toplevel-
     sys.ps1
AttributeError: 'module' object has no attribute 'ps1'
 >>> sys.ps2

Traceback (most recent call last):
   File "<pyshell#28>", line 1, in -toplevel-
     sys.ps2
AttributeError: 'module' object has no attribute 'ps2'

What's wrong?

Thanks,

Dick Moores