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.