为什么cv2.imwrite未保存图片至指定文件夹，目的是按照已有标签信息提取图片？

Question

import cv2
import numpy as np
import os
os.environ['TF_CPP_MIN_LOG_LEVEL'] = '2'


file = open('label_1.txt', 'r')
for line in file.readlines():   
        line_array = line.split(' ')
        img= cv2.imread(r'E:\MMW\test_set\test1\%s' %(line_array[0]))
        filename = r'C:\MMW\%s' %(line_array[0])
        print(filename)
        cv2.imwrite(filename, img)
file.close()

Answer 1

import numpy as np
import cv2

img = cv2.imread('messi5.jpg',0)
cv2.imshow('image',img)
k = cv2.waitKey(0)
## k = cv2.waitKey(0) & 0xFF  # 64位机器
if k == 27:         # 按下esc时，退出
    cv2.destroyAllWindows()
elif k == ord('s'): # 按下s键时保存并退出
    cv2.imwrite('messigray.png',img)
    cv2.destroyAllWindows()

--------补充--------------------
调整你的文件路径，我这里用相对路径就可以