Python的“ for”循环不会迭代太多

Question

我的python代码未进行应有的迭代。工作目录中有六个图像文件，len（f）也提供了六个。但是for循环的实际迭代在执行两个循环后停止。

import os
import cv2
import numpy as np

from matplotlib import pyplot as plt

path = "D:\\_my_python\\Image_histogram_equalization\\source_imgs"
os.chdir(path)
print("Current Working Directory: " , os.getcwd()) 

files = []
for r, d, f in os.walk(path):
    for file in f:
        if '.jpg' in file:
            files.append(os.path.join(r, file))

print("Processing %d files.." %len(f))
count = 0
for f in files:
    g = f[:f.find(".jpg")] + "_CLAHE20.jpg"
    print("Converting %s to %s..." % (f, g))
    img = cv2.imread(f)

    img_yuv = cv2.cvtColor(img, cv2.COLOR_BGR2YUV)

    clahe = cv2.createCLAHE(clipLimit=2, tileGridSize=(8,8))
    img_yuv[:,:,0] = clahe.apply(img_yuv[:,:,0])

    img_output = cv2.cvtColor(img_yuv, cv2.COLOR_YUV2BGR)

    cv2.imwrite(g, img_output)
    count = count + 1
else:
    print("Process completed for %d files out of %d files. " % (count, len(f)))

它应该运行六个循环，因为文件夹中有六个图像，而len（f）也提供了六个图像。