message: Remove redundant return variable
diff: @@ -70,7 +70,7 @@ for fname in glob.glob('left*.jpg'):
  corners2 = cv.cornerSubPix(gray,corners,(11,11),(-1,-1),criteria)
  # Find the rotation and translation vectors.
  - ret,rvecs, tvecs, inliers = cv.solvePnP(objp, corners2, mtx, dist)
  + ret,rvecs, tvecs = cv.solvePnP(objp, corners2, mtx, dist)
  # project 3D points to image plane
  imgpts, jac = cv.projectPoints(axis, rvecs, tvecs, mtx, dist)
  