How to Concatenate Images using OpenCV

Program 1

import cv2
img1=cv2.imread("D://opencvapp//wildlifeImages//wildlife-baby-foxes.jpg")
img2=cv2.imread("D://opencvapp//wildlifeImages//deer-wildlife.jpg")
img3=cv2.imread("D://opencvapp//wildlifeImages//walking-dog.jpg")
img1=cv2.resize(img1,(300,300))
img2=cv2.resize(img2,(300,300))
img3=cv2.resize(img3,(300,300))
#img4=cv2.hconcat([img1,img2,img3])
img4=cv2.vconcat([img1,img2,img3])
cv2.imwrite("D://opencvapp//wildlifeImages//hcon.jpg",img4)
cv2.imshow('Image Window',img4)
# cv2.imshow('Image Window',img2)
cv2.waitKey(0)
cv2.destroyAllWindows()