Fix py3k failure.
Fix py3k failure.

stas/peewee,coleifer/peewee,ronyb29/peewee,zhang625272514/peewee,jnovinger/peewee,new-xiaji/peewee,zhang625272514/peewee,bopo/peewee,ghukill/peewee,Sunzhifeng/peewee,coreos/peewee,softside/peewee,jarrahwu/peewee,bopo/peewee,Sunzhifeng/peewee,wenxer/peewee,teserak/peewee,mackjoner/peewee,jnovinger/peewee,fuzeman/peewee,new-xiaji/peewee,py4a/peewee,jarrahwu/peewee,Sunzhifeng/peewee,coleifer/peewee,wenxer/peewee,coleifer/peewee,new-xiaji/peewee,jarrahwu/peewee,lez/peewee,coreos/peewee,bopo/peewee,fuzeman/peewee,zhang625272514/peewee,coreos/peewee