Change darknet.py to Python 3 compatibility

Philip Kahn

2018-05-04 eaecb49a5f475440b4e6f05a6e13082be95524eb

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classes= 20
train  = data/train_voc.txt
valid  = data/2007_test.txt
#difficult = data/difficult_2007_test.txt
names = data/voc.names
backup = backup/