Fix for Python 2.3 compatibility in `py:with` directive (regression in [240]).
Fix for Python 2.3 compatibility in `py:with` directive (regression in [240]).

git-svn-id: 35afe1d183cbd4849519a30d21151995795e8f1d@243 de761a21-4c15-0410-92fa-db90950b6ec0

dag/genshi,davidfraser/genshi,dag/genshi,dag/genshi,davidfraser/genshi,davidfraser/genshi,dag/genshi,davidfraser/genshi