Fix string format to work with Python 2.6 too
Fix string format to work with Python 2.6 too

ArvinPan/pyzmq,dash-dash/pyzmq,caidongyun/pyzmq,Mustard-Systems-Ltd/pyzmq,yyt030/pyzmq,swn1/pyzmq,swn1/pyzmq,dash-dash/pyzmq,ArvinPan/pyzmq,yyt030/pyzmq,dash-dash/pyzmq,Mustard-Systems-Ltd/pyzmq,yyt030/pyzmq,caidongyun/pyzmq,swn1/pyzmq,Mustard-Systems-Ltd/pyzmq,ArvinPan/pyzmq,caidongyun/pyzmq