problems with python-parted and the creation of partitions

[Ignacio N Feijoo]

Hello, I am new in the list and, before nothing, I must clarify that I 
read (or that treats) all scripts on the subject that there is in the list.
I am practically new with python, but I program long ago and it 
accustoms to me quickly to the language, but, me complica a little some 
functions and some documentation.  The subject is that I must arm a 
particionador in python with parted (I have, I am forced).  I already 
have finished to all the front-end (dialog) and the program this in 
conditions for showing to information on discs and the partitions.  But 
it costs to me to create partitions.

I show script to them that I made to prove:

[code]
Ignacio:~/particionador/# cat test.py
#!/usr/bin/env python

import parted, sys
parted.init()
parted.device_probe_all()

path = '/dev/hdc'

drv = parted.device_get(path)
disk = drv.disk_open()

part = []
for i in disk.get_part_list():
     if i.get_num() <> -1:
             part.append(i)

fs = parted.file_system_type_get('ext2')
type = parted.PARTITION_PRIMARY

start = part[1].get_geom().get_end() + 1
size = start + 1000

Part = parted.Partition(disk,type,fs,start,size)

if not Part:
     print "no se puede crear particion"
     sys.exit(1)

if Part.get_num() == -1:
     print "particion fork?"
     sys.exit(2)

if disk.add_partition(Part) == 0:
     print "nos e puede agregar la particion"
     sys.exit(3)
else:
     print "Partition %s%d create!!" % (path,Part.get_num())
Ignacio:~/particionador/# ./test.py
Partition fork?
Ignacio:~/particionador/#
[/code]

This code, or generates a partition to me fork or it creates a normal 
partition to me, but when trying to do add, it throws a segment 
violation to me.
I am trying long ago to create a partition and it does not leave. But, 
when it tries to redimencionar a partition!  Somebody can help me?  
somebody has script that does this and that him can throw a look?

Thanks!