The example is working correctly for:
Python 3.2a3 (r32a3:85355, Oct 10 2010, 17:11:45) [MSC v.1500 32 bit (Intel)] on win32

# First test:
C:\mike>c:\Python32\python.exe s2.py
main line
module name: __main__
parent process: 2360
process id: 1584
function f
module name: __main__
parent process: 1584
process id: 3588
hello bob

# Second test (run it again to see process IDs change)
C:\mike>c:\Python32\python.exe s2.py
main line
module name: __main__
parent process: 2360
process id: 5904
function f
module name: __main__
parent process: 5904
process id: 1560
hello bob

# For reference:
C:\mike>c:\Python32\python.exe
Python 3.2a3 (r32a3:85355, Oct 10 2010, 17:11:45) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.getppid()
2360