popen problems

[Dan Armbrust]

python
Python 2.5 (r25:51908, Mar 13 2007, 08:13:14)
[GCC 3.4.4 (cygming special, gdc 0.12, using dmd 0.125)] on cygwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import os.path
>>> os.popen('ls').readline()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
OSError: [Errno 13] Permission denied

This is inside of a rxvt window.

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