subprocess problem on WinXP

Hi,

I want to compress all files (also in subfolder). The code is working more or less, but I get a black popup window (command line window) for every file to compress. How do I cave to change my system call that nothing pops up?

Wolfgang

import os
import subprocess

dir="g:\\messtech"

for root, dirs, files in os.walk(dir):
for file in files:
f=os.path.join(root,file)
subprocess.Popen([r"bzip2",'', f],shell=False).wait()

.

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