opencv python顯示柴犬圖片與loop, list練習

import cv2

xx=[]

for i in range(10):
    x=cv2.imread('dog'+str(i)+'.jpg')
    y=cv2.resize(x,(600, 800))
    cv2.imshow('dog', y)
    cv2.waitKey(500)
    xx.append(y)
cv2.destroyAllWindows()

k=-1
while k==-1:
    for x in xx:
        cv2.imshow('dog2', x)
        k=cv2.waitKey(500) 
cv2.destroyAllWindows()