Various Python samples updated for Python 2/3 compatibility.

samples/python2/browse.py

@@ -12,6 +12,14 @@ browse.py [image filename]
 
 '''
 
+# Python 2/3 compatibility
+from __future__ import print_function
+import sys
+PY3 = sys.version_info[0] == 3
+
+if PY3:
+    xrange = range
+
 import numpy as np
 import cv2
 
@@ -19,21 +27,21 @@ import cv2
 import sys
 
 if __name__ == '__main__':
-    print 'This sample shows how to implement a simple hi resolution image navigation.'
-    print 'USAGE: browse.py [image filename]'
-    print
+    print('This sample shows how to implement a simple hi resolution image navigation.')
+    print('USAGE: browse.py [image filename]')
+    print()
 
     if len(sys.argv) > 1:
         fn = sys.argv[1]
-        print 'loading %s ...' % fn
+        print('loading %s ...' % fn)
         img = cv2.imread(fn)
         if img is None:
-            print 'Failed to load fn:', fn
+            print('Failed to load fn:', fn)
             sys.exit(1)
 
     else:
         sz = 4096
-        print 'generating %dx%d procedural image ...' % (sz, sz)
+        print('generating %dx%d procedural image ...' % (sz, sz))
         img = np.zeros((sz, sz), np.uint8)
         track = np.cumsum(np.random.rand(500000, 2)-0.5, axis=0)
         track = np.int32(track*10 + (sz/2, sz/2))