os.remove() permission problem

[Victor Subervi]

Hi;
I get the following error when I try
os.remove(file)

*OSError*: [Errno 13] Permission denied: 'particulars.py'
      args = (13, 'Permission denied')
      errno = 13
      filename = 'particulars.py'
      strerror = 'Permission denied'

Here are the permissions:

-rwxr-xr-x  1 root root   455 Nov 28 05:58 particulars.py

When I go into the python interpreter and execute that statement, it
succeeds. What have I missed?
TIA,
Victor
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