python: 'cv2.' -> 'cv.' via 'import cv2 as cv'

modules/python/test/test_houghlines.py

@@ -7,7 +7,7 @@ This example illustrates how to use Hough Transform to find lines
 # Python 2/3 compatibility
 from __future__ import print_function
 
-import cv2
+import cv2 as cv
 import numpy as np
 import sys
 import math
@@ -16,9 +16,9 @@ from tests_common import NewOpenCVTests
 
 def linesDiff(line1, line2):
 
-    norm1 = cv2.norm(line1 - line2, cv2.NORM_L2)
+    norm1 = cv.norm(line1 - line2, cv.NORM_L2)
     line3 = line1[2:4] + line1[0:2]
-    norm2 = cv2.norm(line3 - line2, cv2.NORM_L2)
+    norm2 = cv.norm(line3 - line2, cv.NORM_L2)
 
     return min(norm1, norm2)
 
@@ -29,9 +29,9 @@ class houghlines_test(NewOpenCVTests):
         fn = "/samples/data/pic1.png"
 
         src = self.get_sample(fn)
-        dst = cv2.Canny(src, 50, 200)
+        dst = cv.Canny(src, 50, 200)
 
-        lines = cv2.HoughLinesP(dst, 1, math.pi/180.0, 40, np.array([]), 50, 10)[:,0,:]
+        lines = cv.HoughLinesP(dst, 1, math.pi/180.0, 40, np.array([]), 50, 10)[:,0,:]
 
         eps = 5
         testLines = [