Getting File Permissions

[Hari]

Hi,
For getting permissions of a file, the following script has been
suggested in the same group

import os, stat
st = os.stat(myfile)
mode = st[stat.ST_MODE]
print "mode is", octal(mode & 0777)

But while executing I am getting error message as follows

Traceback (most recent call last):
 File "<stdin>", line 1, in ?
NameError: name 'octal' is not defined

Since I am new to python, can any one help me to solve this error?
A bunch of thanks in advance.

Hari