diff --git a/doc/py_tutorials/py_core/py_optimization/py_optimization.markdown b/doc/py_tutorials/py_core/py_optimization/py_optimization.markdown
index 7623a8ff3a..4631d3bf58 100644
--- a/doc/py_tutorials/py_core/py_optimization/py_optimization.markdown
+++ b/doc/py_tutorials/py_core/py_optimization/py_optimization.markdown
@@ -40,7 +40,7 @@ goal):
 img1 = cv.imread('messi5.jpg')
 
 e1 = cv.getTickCount()
-for i in xrange(5,49,2):
+for i in range(5,49,2):
     img1 = cv.medianBlur(img1,i)
 e2 = cv.getTickCount()
 t = (e2 - e1)/cv.getTickFrequency()