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When I make the same shell call a second time, a weird error occurs. 
It appears that the system is caching the call and then returning the 
same object the second time, which causes a problem because the stream 
is at EOF and there is no way to seek on this sort of file object.
Code:
 fout = subprocess.Popen("owplaces -silent -multi", shell=True, 
stdout=subprocess.PIPE).stdout
 self.output = fout.read()
 
 if self.output != []:
 for line in self.output:
 print line
 
 fout.close()
Error:
Traceback (most recent call last):
 File "./saveSettings.py", line 30, in next_page
 func()
 File "./saveSettings.py", line 62, in save_startup
 fout = subprocess.Popen("owplaces -silent -multi", shell=True, 
stdout=subprocess.PIPE).stdout
 File "/opt/app/g++lib6/python-2.4/lib/python2.4/warnings.py", line 
61, in warn
 warn_explicit(message, category, filename, lineno, module, registry)
 File "/opt/app/g++lib6/python-2.4/lib/python2.4/warnings.py", line 
82, in warn_explicit
 for item in filters:
TypeError: an integer is required
The first time the code works time. The second (and subsequent times) 
the cryptic error msg is displayed.
Python 2.4.5 running on a Solaris machine.

Correction: line two should actually be:
self.output = fout.readlines()
The bug still exists with this change.

I am unable to reproduce this (using release24-maint on OS X 10.4). the
script I used is attached.
Does this script fail for you? If not, please upload something that fails.

Further research reveals that the problem appears to be with the 
gtk.Assistant class in PyGTK 2.10, not the subprocess lib.
Report can be closed.