Missing module using offlineimap via cron

[Raffi Khatchadourian <khatchad@xxxxxxxxxxxxxxxxxx>]

Hi,

Offlineimap works fine when I run it from the console, however, when I
install it as a cron I get the follow error:

Traceback (most recent call last):
   File "/Users/raffi/local/offlineimap/offlineimap.py", line 20, in ?
     from offlineimap import init
   File "/Users/raffi/local/offlineimap/offlineimap/init.py", line 20, in ?
     from offlineimap import imapserver, repository, folder, mbnames, 
threadutil, version, syncmaster, accounts
   File "/Users/raffi/local/offlineimap/offlineimap/imapserver.py", line 20, in 
?
     from offlineimap import imaplibutil, imaputil, threadutil
   File "/Users/raffi/local/offlineimap/offlineimap/imaplibutil.py", line 19, 
in ?
     import re, string, types, binascii, socket, time, random, subprocess, sys, 
os
ImportError: No module named subprocess

I expect that I should be setting some environmental variable to the
location of my python library. Does anyone have any ideas? Here is my crontab 
file:

MAILTO="raffi@localhost"
*/3 * * * * /Users/raffi/local/offlineimap/offlineimap.py -q -u 
Noninteractive.Quiet

Thanks!

Raffi