There may be a related issue that I still hit with 2.6.5.

% cat /tmp/a.py 
import zipfile
import os

z = zipfile.ZipFile('/tmp/a.zip', 'w')
open("/tmp/a", "w")
os.utime("/tmp/a", (0,0))
z.write("/tmp/a", "a")
% python -V
Python 2.6.5
% uname -mo
x86_64 GNU/Linux
% uname -mor
2.6.32-gg426-generic x86_64 GNU/Linux
% python /tmp/a.py
/usr/lib/python2.6/zipfile.py:1047: DeprecationWarning: struct integer overflow masking is deprecated
  self.fp.write(zinfo.FileHeader())
/usr/lib/python2.6/zipfile.py:1047: DeprecationWarning: 'H' format requires 0 <= number <= 65535
  self.fp.write(zinfo.FileHeader())
/usr/lib/python2.6/zipfile.py:1123: DeprecationWarning: struct integer overflow masking is deprecated
  self.close()
/usr/lib/python2.6/zipfile.py:1123: DeprecationWarning: 'H' format requires 0 <= number <= 65535
  self.close()