problem opening a file on 2.2a1

[Rajarshi Guha]

Hi,
  I compiled Python 2.2a1 on RedHat 7.0. When I enter the python 
interpreter from the command line the code:

data = open('data.out','w')

works fine. But when I try it froma  script I get the error:

Traceback (most recent call last):
  File "./p.py", line 12, in ?
    data = open('data.out','w')
TypeError: an integer is required

What am I doing wrong?
TIA,
-- 
--
Rajarshi Guha