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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.