Merge pull request cocodataset#280 from Johnqczhang/master

fix unicode error in python3

Author: pdollar

PythonAPI/pycocotools/coco.py

@@ -305,7 +305,7 @@ def loadRes(self, resFile):
 
         print('Loading and preparing results...')
         tic = time.time()
-        if type(resFile) == str or type(resFile) == unicode:
+        if type(resFile) == str or (PYTHON_VERSION == 2 and type(resFile) == unicode):
             anns = json.load(open(resFile))
         elif type(resFile) == np.ndarray:
             anns = self.loadNumpyAnnotations(resFile)