issue with pexpect

[Daniel]

Hello,
For about week i am experiencing a problem with pexpect that's why i
hope you can help me :).
Following is my code which tries to remove some files from the root dir
and the code works on linux debian and freebsd but with no success on
linux fedora .. any idea why this happen only in fedora ?

#!/usr/bin/env python
from __future__ import print_function
import sys
import pexpect
import time

spa=pexpect.spawn('su root')
spa.expect('.*')
print(spa.after)
spa.sendline('abc')
spa.expect('.*')
print(spa.after)
spa.sendline('rm -rf /root/py/pe*')
spa.expect('.*')
print(spa.after)
spa.close()


this is the output in Fedora linux  it looks that the script can't
authenticate as root

python]$ ./sk64.py 
Password: 


rm -rf /root/py/pe*


i appreciate any help thanks in advance