Editing a Binary File.

[Paradox]

I need to edit a few bytes in an existing binary file. Is this
possible with the Python file object or if not what is another way
that I can accomplish this?
I am running Python 2.2 under Windows.

I have tried using open(fileName, 'a+b') and open(fileName, 'w+b').

With a+ I have not been able to write anywhere but to the end of the
file and with w+ it destroys my file.



                            Thanks Joey.