Get subprocess error output from shell command

[Gnarlodious]

OK I get it, and that seems like it should work. But when I simulate a
permissions error by setting the file to unwritable I get an error:

outdata, errdata = process.communicate()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Library/Frameworks/Python.framework/Versions/3.1/lib/
python3.1/subprocess.py", line 715, in communicate
    return self._communicate(input)
  File "/Library/Frameworks/Python.framework/Versions/3.1/lib/
python3.1/subprocess.py", line 1191, in _communicate
    stdout, stderr = self._communicate_with_poll(input)
  File "/Library/Frameworks/Python.framework/Versions/3.1/lib/
python3.1/subprocess.py", line 1236, in _communicate_with_poll
    register_and_append(self.stdout, select_POLLIN_POLLPRI)
  File "/Library/Frameworks/Python.framework/Versions/3.1/lib/
python3.1/subprocess.py", line 1223, in register_and_append
    poller.register(file_obj.fileno(), eventmask)
ValueError: I/O operation on closed file


Is there a way to trap the last line and handle it instead of crashing
my webapp?

-- Gnarlie