_socket on solaris

[eli li]

When I run my program on Solaris, the next message is printed.

   Traceback (most recent call last):
    . . . . . . . . . . . . . . . . . . . . .
     File "/usr/local/lib/python2.2/socket.py", line 41, in ?
       from _socket import *
   ImportError: No module named _socket

The reason is clear: file _socket is not found. Where can I found this
library?