Prevent grabcut, houghcircles and houghlines python2 demos from running automatically while browsing demos in the demo list viewer

samples/python2/grabcut.py

@@ -95,6 +95,8 @@ def onmouse(event,x,y,flags,param):
             cv2.circle(img,(x,y),thickness,value['color'],-1)
             cv2.circle(mask,(x,y),thickness,value['val'],-1)
 
+if __name__ == '__main__':
+
     # print documentation
     print __doc__
 

samples/python2/houghcircles.py

@@ -10,6 +10,7 @@ import cv2
 import numpy as np
 import sys
 
+if __name__ == '__main__':
 
     print __doc__
     try:

samples/python2/houghlines.py

@@ -9,6 +9,8 @@ import numpy as np
 import sys
 import math
 
+if __name__ == '__main__':
+
     try:
         fn = sys.argv[1]
     except: