bugfix: File is a iterator, should not have __len__
bugfix: File is a iterator, should not have __len__

douban/dpark,windreamer/dpark,dogeyes/dpark,yhj630520/dpark,junmoa/dpark,smarthomekit/dpark,douban/dpark,daishaowei/dpark,dogeyes/dpark,Mignet/dpark,yanheven/dpark,quxiaolong1504/dpark,windreamer/dpark,304471720/dpark,douban/dpark,zzl0/dpark,douban/dpark,junmoa/dpark,oceanjack/dpark,fe11x/dpark,yhj630520/dpark,fe11x/dpark,mageia/dpark,mageia/dpark,yhj630520/dpark,smarthomekit/dpark,veritynoob/dpark,quxiaolong1504/dpark,daishaowei/dpark,zzl0/dpark,oceanjack/dpark,Mignet/dpark,douban/dpark,veritynoob/dpark,ee08b397/dpark,windreamer/dpark,304471720/dpark,dogeyes/dpark,veritynoob/dpark,windreamer/dpark,304471720/dpark,yanheven/dpark,smarthomekit/dpark