python: better Python 3 support

modules/dnn/misc/quantize_face_detector.py

@@ -1,10 +1,14 @@
 from __future__ import print_function
+import sys
 import argparse
 import cv2 as cv
 import tensorflow as tf
 import numpy as np
 import struct
 
+if sys.version_info > (3,):
+    long = int
+
 from tensorflow.python.tools import optimize_for_inference_lib
 from tensorflow.tools.graph_transforms import TransformGraph
 from tensorflow.core.framework.node_def_pb2 import NodeDef