I was trying to open a text file which size is 2817663929 bytes and got this message: IOError: [Errno 79] Value too large for defined data type: The machine is a Solaris 2.7 unix box with a few G memory and Python 1.5.2b2 has been compiled with large file support options. Is there any switch I can turn on to let Python chew the file? Thanks. Hao