[IO] fix python3 bug
[IO] fix python3 bug

antoan2/incubator-mxnet,hpi-xnor/BMXNet,dmlc/mxnet,thirdwing/mxnet,danithaca/mxnet,madjam/mxnet,arank/mxnet,madjam/mxnet,DR08/mxnet,thirdwing/mxnet,rishita/mxnet,hpi-xnor/BMXNet,indhub/mxnet,crazy-cat/incubator-mxnet,DR08/mxnet,Northrend/mxnet,EvanzzzZ/mxnet,mbaijal/incubator-mxnet,sergeykolychev/mxnet,solin319/incubator-mxnet,Northrend/mxnet,dmlc/mxnet,arikpoz/mxnet,lxn2/mxnet,kevinthesun/mxnet,larroy/mxnet,zhreshold/mxnet,navrasio/mxnet,vikingMei/mxnet,EvanzzzZ/mxnet,Northrend/mxnet,stefanhenneking/mxnet,thirdwing/mxnet,sxjscience/mxnet,jiajiechen/mxnet,tornadomeet/mxnet,saurabh3949/mxnet,indhub/mxnet,Northrend/mxnet,jermainewang/mxnet,sergeykolychev/mxnet,LinkHS/incubator-mxnet,yajiedesign/mxnet,EvanzzzZ/mxnet,apache/incubator-mxnet,leezu/mxnet,formath/mxnet,lxn2/mxnet,smolix/incubator-mxnet,precedenceguo/mxnet,EvanzzzZ/mxnet,sxjscience/mxnet,ykim362/mxnet,solin319/incubator-mxnet,vikingMei/mxnet,likelyzhao/mxnet,smolix/incubator-mxnet,jermainewang/mxnet,szha/mxnet,szha/mxnet,zhreshold/mxnet,saurabh3949/mxnet,ZihengJiang/mxnet,sxjscience/mxnet,dmlc/mxnet,LinkHS/incubator-mxnet,gautamkmr/incubator-mxnet,Mega-DatA-Lab/mxnet,Guneet-Dhillon/mxnet,precedenceguo/mxnet,arikpoz/mxnet,Mega-DatA-Lab/mxnet,yuruofeifei/mxnet,Guneet-Dhillon/mxnet,thirdwing/mxnet,jamesliu/mxnet,hotpxl/mxnet,formath/mxnet,hesseltuinhof/mxnet,jiajiechen/mxnet,ZihengJiang/mxnet,kkk669/mxnet,Prasad9/incubator-mxnet,CodingCat/mxnet,rishita/mxnet,gautamkmr/incubator-mxnet,formath/mxnet,likelyzhao/mxnet,jamesliu/mxnet,sergeykolychev/mxnet,ShownX/incubator-mxnet,tlby/mxnet,crazy-cat/incubator-mxnet,weleen/mxnet,stefanhenneking/mxnet,hesseltuinhof/mxnet,EvanzzzZ/mxnet,indhub/mxnet,Guneet-Dhillon/mxnet,dmlc/mxnet,TuSimple/mxnet,yuruofeifei/mxnet,hotpxl/mxnet,Mega-DatA-Lab/mxnet,antoan2/incubator-mxnet,LinkHS/incubator-mxnet,fullfanta/mxnet,luoyetx/mxnet,xcgoner/dist-mxnet,apaleyes/mxnet,mbaijal/incubator-mxnet,lxn2/mxnet,madjam/mxnet,larroy/mxnet,nicklhy/mxnet,kevinthesun/mxnet,apaleyes/mxnet,hotpxl/mxnet,TuSimple/mxnet,hesseltuinhof/mxnet,tlby/mxnet,yajiedesign/mxnet,jamesliu/mxnet,arikpoz/mxnet,luoyetx/mxnet,jamesliu/mxnet,kkk669/mxnet,jamesliu/mxnet,mbaijal/incubator-mxnet,szha/mxnet,tlby/mxnet,navrasio/mxnet,ykim362/mxnet,luoyetx/mxnet,jamesliu/mxnet,ptrendx/mxnet,jennyzhang0215/incubator-mxnet,hotpxl/mxnet,smolix/incubator-mxnet,crazy-cat/incubator-mxnet,navrasio/mxnet,weleen/mxnet,jermainewang/mxnet,antoan2/incubator-mxnet,Northrend/mxnet,formath/mxnet,tornadomeet/mxnet,yuruofeifei/mxnet,tornadomeet/mxnet,hpi-xnor/BMXNet,DickJC123/mxnet,xcgoner/dist-mxnet,DickJC123/mxnet,piiswrong/mxnet,yuruofeifei/mxnet,Prasad9/incubator-mxnet,likelyzhao/mxnet,jermainewang/mxnet,DickJC123/mxnet,arank/mxnet,solin319/incubator-mxnet,rahul003/mxnet,fullfanta/mxnet,antoan2/incubator-mxnet,CodingCat/mxnet,DR08/mxnet,danithaca/mxnet,ShownX/incubator-mxnet,rahul003/mxnet,sergeykolychev/mxnet,fullfanta/mxnet,ShownX/incubator-mxnet,larroy/mxnet,tlby/mxnet,precedenceguo/mxnet,piiswrong/mxnet,leezu/mxnet,madjam/mxnet,kevinthesun/mxnet,saurabh3949/mxnet,wangyum/mxnet,vikingMei/mxnet,TuSimple/mxnet,Prasad9/incubator-mxnet,Ldpe2G/mxnet,navrasio/mxnet,Mega-DatA-Lab/mxnet,ZihengJiang/mxnet,hotpxl/mxnet,eric-haibin-lin/mxnet,piiswrong/mxnet,TuSimple/mxnet,arikpoz/mxnet,Guneet-Dhillon/mxnet,coder-james/mxnet,hpi-xnor/BMXNet,rishita/mxnet,jennyzhang0215/incubator-mxnet,antoan2/incubator-mxnet,Northrend/mxnet,precedenceguo/mxnet,DR08/mxnet,jennyzhang0215/incubator-mxnet,jamesliu/mxnet,ykim362/mxnet,indhub/mxnet,stefanhenneking/mxnet,arikpoz/mxnet,formath/mxnet,rishita/mxnet,leezu/mxnet,sxjscience/mxnet,saurabh3949/mxnet,navrasio/mxnet,jennyzhang0215/incubator-mxnet,hotpxl/mxnet,reminisce/mxnet,solin319/incubator-mxnet,thirdwing/mxnet,CodingCat/mxnet,ptrendx/mxnet,madjam/mxnet,lxn2/mxnet,tlby/mxnet,jennyzhang0215/incubator-mxnet,leezu/mxnet,stefanhenneking/mxnet,yajiedesign/mxnet,vikingMei/mxnet,CodingCat/mxnet,pluskid/mxnet,zhreshold/mxnet,zhreshold/mxnet,ForkedReposBak/mxnet,solin319/incubator-mxnet,yajiedesign/mxnet,kkk669/mxnet,gautamkmr/incubator-mxnet,tlby/mxnet,LinkHS/incubator-mxnet,eric-haibin-lin/mxnet,apaleyes/mxnet,sxjscience/mxnet,pluskid/mxnet,ShownX/incubator-mxnet,LinkHS/incubator-mxnet,smolix/incubator-mxnet,luoyetx/mxnet,CodingCat/mxnet,pluskid/mxnet,kkk669/mxnet,TuSimple/mxnet,yajiedesign/mxnet,sergeykolychev/mxnet,arikpoz/mxnet,DR08/mxnet,zhreshold/mxnet,DR08/mxnet,piiswrong/mxnet,weleen/mxnet,jiajiechen/mxnet,kkk669/mxnet,madjam/mxnet,ForkedReposBak/mxnet,nicklhy/mxnet,antoan2/incubator-mxnet,ZihengJiang/mxnet,yuruofeifei/mxnet,wangyum/mxnet,weleen/mxnet,navrasio/mxnet,kevinthesun/mxnet,apaleyes/mxnet,danithaca/mxnet,CodingCat/mxnet,reminisce/mxnet,smolix/incubator-mxnet,smolix/incubator-mxnet,wangyum/mxnet,eric-haibin-lin/mxnet,tlby/mxnet,yajiedesign/mxnet,crazy-cat/incubator-mxnet,solin319/incubator-mxnet,saurabh3949/mxnet,likelyzhao/mxnet,gautamkmr/incubator-mxnet,pluskid/mxnet,solin319/incubator-mxnet,hesseltuinhof/mxnet,lxn2/mxnet,lxn2/mxnet,ForkedReposBak/mxnet,luoyetx/mxnet,apaleyes/mxnet,wangyum/mxnet,apache/incubator-mxnet,mbaijal/incubator-mxnet,Northrend/mxnet,pluskid/mxnet,danithaca/mxnet,eric-haibin-lin/mxnet,ZihengJiang/mxnet,szha/mxnet,rahul003/mxnet,arank/mxnet,Prasad9/incubator-mxnet,Ldpe2G/mxnet,fullfanta/mxnet,reminisce/mxnet,weleen/mxnet,LinkHS/incubator-mxnet,DickJC123/mxnet,precedenceguo/mxnet,indhub/mxnet,Mega-DatA-Lab/mxnet,ZihengJiang/mxnet,fullfanta/mxnet,Northrend/mxnet,mbaijal/incubator-mxnet,piiswrong/mxnet,piiswrong/mxnet,ZihengJiang/mxnet,jermainewang/mxnet,jiajiechen/mxnet,rishita/mxnet,szha/mxnet,luoyetx/mxnet,danithaca/mxnet,kkk669/mxnet,TuSimple/mxnet,Ldpe2G/mxnet,precedenceguo/mxnet,TuSimple/mxnet,tlby/mxnet,hotpxl/mxnet,sxjscience/mxnet,gautamkmr/incubator-mxnet,nicklhy/mxnet,thirdwing/mxnet,sxjscience/mxnet,wangyum/mxnet,stefanhenneking/mxnet,sxjscience/mxnet,coder-james/mxnet,larroy/mxnet,ForkedReposBak/mxnet,nicklhy/mxnet,xcgoner/dist-mxnet,ptrendx/mxnet,ykim362/mxnet,zhreshold/mxnet,solin319/incubator-mxnet,arank/mxnet,Prasad9/incubator-mxnet,eric-haibin-lin/mxnet,wangyum/mxnet,likelyzhao/mxnet,szha/mxnet,reminisce/mxnet,jennyzhang0215/incubator-mxnet,Guneet-Dhillon/mxnet,coder-james/mxnet,crazy-cat/incubator-mxnet,tornadomeet/mxnet,jennyzhang0215/incubator-mxnet,mbaijal/incubator-mxnet,madjam/mxnet,Ldpe2G/mxnet,ykim362/mxnet,leezu/mxnet,piiswrong/mxnet,EvanzzzZ/mxnet,likelyzhao/mxnet,ptrendx/mxnet,rishita/mxnet,nicklhy/mxnet,zhreshold/mxnet,jiajiechen/mxnet,nicklhy/mxnet,saurabh3949/mxnet,eric-haibin-lin/mxnet,arank/mxnet,Guneet-Dhillon/mxnet,ptrendx/mxnet,dmlc/mxnet,weleen/mxnet,rishita/mxnet,tornadomeet/mxnet,rahul003/mxnet,antoan2/incubator-mxnet,reminisce/mxnet,madjam/mxnet,arank/mxnet,pluskid/mxnet,formath/mxnet,Mega-DatA-Lab/mxnet,eric-haibin-lin/mxnet,tornadomeet/mxnet,larroy/mxnet,ptrendx/mxnet,ykim362/mxnet,ZihengJiang/mxnet,piiswrong/mxnet,tornadomeet/mxnet,precedenceguo/mxnet,ykim362/mxnet,hpi-xnor/BMXNet,lxn2/mxnet,ShownX/incubator-mxnet,Mega-DatA-Lab/mxnet,rahul003/mxnet,yuruofeifei/mxnet,crazy-cat/incubator-mxnet,rahul003/mxnet,indhub/mxnet,sergeykolychev/mxnet,reminisce/mxnet,rishita/mxnet,reminisce/mxnet,gautamkmr/incubator-mxnet,arikpoz/mxnet,gautamkmr/incubator-mxnet,jermainewang/mxnet,tornadomeet/mxnet,eric-haibin-lin/mxnet,TuSimple/mxnet,formath/mxnet,wangyum/mxnet,jermainewang/mxnet,dmlc/mxnet,weleen/mxnet,ShownX/incubator-mxnet,coder-james/mxnet,navrasio/mxnet,apaleyes/mxnet,ykim362/mxnet,piiswrong/mxnet,fullfanta/mxnet,yajiedesign/mxnet,Prasad9/incubator-mxnet,reminisce/mxnet,arank/mxnet,nicklhy/mxnet,ForkedReposBak/mxnet,hesseltuinhof/mxnet,leezu/mxnet,ptrendx/mxnet,jiajiechen/mxnet,apache/incubator-mxnet,vikingMei/mxnet,larroy/mxnet,fullfanta/mxnet,coder-james/mxnet,ShownX/incubator-mxnet,CodingCat/mxnet,sergeykolychev/mxnet,Ldpe2G/mxnet,kevinthesun/mxnet,stefanhenneking/mxnet,gautamkmr/incubator-mxnet,smolix/incubator-mxnet,ForkedReposBak/mxnet,leezu/mxnet,zhreshold/mxnet,likelyzhao/mxnet,dmlc/mxnet,sergeykolychev/mxnet,yajiedesign/mxnet,smolix/incubator-mxnet,arank/mxnet,hotpxl/mxnet,mbaijal/incubator-mxnet,jennyzhang0215/incubator-mxnet,hesseltuinhof/mxnet,kevinthesun/mxnet,thirdwing/mxnet,formath/mxnet,coder-james/mxnet,kevinthesun/mxnet,Mega-DatA-Lab/mxnet,tlby/mxnet,EvanzzzZ/mxnet,sxjscience/mxnet,solin319/incubator-mxnet,rahul003/mxnet,thirdwing/mxnet,xcgoner/dist-mxnet,rahul003/mxnet,danithaca/mxnet,Guneet-Dhillon/mxnet,Ldpe2G/mxnet,lxn2/mxnet,ykim362/mxnet,crazy-cat/incubator-mxnet,saurabh3949/mxnet,stefanhenneking/mxnet,yajiedesign/mxnet,reminisce/mxnet,Ldpe2G/mxnet,reminisce/mxnet,navrasio/mxnet,Prasad9/incubator-mxnet,ptrendx/mxnet,hesseltuinhof/mxnet,luoyetx/mxnet,kkk669/mxnet,TuSimple/mxnet,ForkedReposBak/mxnet,ShownX/incubator-mxnet,xcgoner/dist-mxnet,EvanzzzZ/mxnet,Ldpe2G/mxnet,wangyum/mxnet,jermainewang/mxnet,apache/incubator-mxnet,vikingMei/mxnet,likelyzhao/mxnet,kkk669/mxnet,apaleyes/mxnet,fullfanta/mxnet,kevinthesun/mxnet,crazy-cat/incubator-mxnet,stefanhenneking/mxnet,precedenceguo/mxnet,vikingMei/mxnet,pluskid/mxnet,ForkedReposBak/mxnet,luoyetx/mxnet,lxn2/mxnet,Prasad9/incubator-mxnet,zhreshold/mxnet,hpi-xnor/BMXNet,DR08/mxnet,ptrendx/mxnet,arikpoz/mxnet,yuruofeifei/mxnet,thirdwing/mxnet,weleen/mxnet,LinkHS/incubator-mxnet,Prasad9/incubator-mxnet,ptrendx/mxnet,jamesliu/mxnet,indhub/mxnet,coder-james/mxnet,jiajiechen/mxnet,Northrend/mxnet,szha/mxnet,nicklhy/mxnet,larroy/mxnet,xcgoner/dist-mxnet,pluskid/mxnet,leezu/mxnet,ShownX/incubator-mxnet,ZihengJiang/mxnet,tornadomeet/mxnet,rishita/mxnet,luoyetx/mxnet,weleen/mxnet,mbaijal/incubator-mxnet,eric-haibin-lin/mxnet,leezu/mxnet,stefanhenneking/mxnet,coder-james/mxnet,hotpxl/mxnet,hpi-xnor/BMXNet,larroy/mxnet,yuruofeifei/mxnet,saurabh3949/mxnet,indhub/mxnet,jiajiechen/mxnet,dmlc/mxnet,kkk669/mxnet,hpi-xnor/BMXNet,formath/mxnet,danithaca/mxnet,Guneet-Dhillon/mxnet,jermainewang/mxnet,apaleyes/mxnet,danithaca/mxnet,sergeykolychev/mxnet,vikingMei/mxnet,CodingCat/mxnet,xcgoner/dist-mxnet,antoan2/incubator-mxnet,tlby/mxnet,smolix/incubator-mxnet,dmlc/mxnet,DR08/mxnet,arikpoz/mxnet,coder-james/mxnet,larroy/mxnet,vikingMei/mxnet,precedenceguo/mxnet,yuruofeifei/mxnet,pluskid/mxnet,Guneet-Dhillon/mxnet,DR08/mxnet,EvanzzzZ/mxnet,jiajiechen/mxnet,hesseltuinhof/mxnet,mbaijal/incubator-mxnet,kevinthesun/mxnet,navrasio/mxnet,madjam/mxnet,indhub/mxnet,hesseltuinhof/mxnet,TuSimple/mxnet,LinkHS/incubator-mxnet,LinkHS/incubator-mxnet,jamesliu/mxnet,CodingCat/mxnet,ForkedReposBak/mxnet,likelyzhao/mxnet,rahul003/mxnet,antoan2/incubator-mxnet,fullfanta/mxnet,gautamkmr/incubator-mxnet,saurabh3949/mxnet,apaleyes/mxnet,wangyum/mxnet,hpi-xnor/BMXNet,szha/mxnet,Mega-DatA-Lab/mxnet,Ldpe2G/mxnet,danithaca/mxnet,crazy-cat/incubator-mxnet,nicklhy/mxnet,jennyzhang0215/incubator-mxnet,szha/mxnet,arank/mxnet,xcgoner/dist-mxnet,xcgoner/dist-mxnet