0 bzed@hal:/tmp/b$ python -O
Python 2.4.4 (#2, Apr 25 2007, 22:41:41)
[GCC 4.1.3 20070423 (prerelease) (Debian 4.1.2-4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import foo
>>>
0 bzed@hal:/tmp/b$ ll
total 8
-rw-r--r-- 1 bzed bzed  28 2007-05-09 03:12 foo.py
-rw-r--r-- 1 bzed bzed 191 2007-05-09 03:12 foo.pyo
0 bzed@hal:/tmp/b$ rm foo.py
0 bzed@hal:/tmp/b$ python
Python 2.4.4 (#2, Apr 25 2007, 22:41:41)
[GCC 4.1.3 20070423 (prerelease) (Debian 4.1.2-4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import foo
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
ImportError: No module named foo
>>>
0 bzed@hal:/tmp/b$ python -O
Python 2.4.4 (#2, Apr 25 2007, 22:41:41)
[GCC 4.1.3 20070423 (prerelease) (Debian 4.1.2-4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import foo
>>>
0 bzed@hal:/tmp/b$