在python中浏览文件夹时遇到一些问题

我在尝试使用os.walk（）遍历特定文件夹来计算我拥有的内存量时遇到一个小问题。似乎可以遍历指定的文件夹（基本上是第一轮）并确定对象是文件还是文件夹。

当它经过第二轮（第一轮的第一个子文件夹）时，就会出现此问题。它不会捕获某些文件，并且会返回错误。

    for folderName, subfolders, filenames in os.walk(original_root_folder):
        space()
        print('The current folder is ' + folderName)

        for subfolder in subfolders:
            print('SUBFOLDER OF ' + folderName + ': ' + subfolder + ', Size is ', (os.path.getsize(subfolder) / 1000), " KB")
            total_size_of_folder = total_size_of_folder + os.path.getsize(subfolder)

        for filename in filenames:
            print('FILE INSIDE ' + folderName + ': '+ filename + ', Size is ', (os.path.getsize(filename) / 1000), " KB")
            total_size_of_folder = total_size_of_folder + os.path.getsize(filename)

    print("Total of folder",(total_size_of_folder/1000)," KB")

这是第一轮的结果，这是理想的结果

    The current folder is C:\Users\Someone\Desktop
    SUBFOLDER OF C:\Users\Someone\Desktop: COMP, Size is  4.096  KB
    SUBFOLDER OF C:\Users\Someone\Desktop: compa, Size is  0.0  KB
    SUBFOLDER OF C:\Users\Someone\Desktop: compa2, Size is  4.096  KB
    SUBFOLDER OF C:\Users\Someone\Desktop: HitFilm Express 2017 Exports, Size is  0.0  KB

这是第二轮

    The current folder is C:\Users\Someone\Desktop\COMP
    SUBFOLDER OF C:\Users\Someone\Desktop\COMP: comp2402a1, Size is  0.0  KB
    FILE INSIDE C:\Users\Someone\Desktop\COMP: comp2402a1.zip, Size is  5.786  KB

这是错误

    Traceback (most recent call last):
      File "C:/Users/Someone/Desktop/Python testing/reg.py", line 129, in <module>
        print('FILE INSIDE ' + folderName + ': '+ filename + ', Size is ', (os.path.getsize(filename) / 1000), " KB")
      File "C:\Users\Someone\AppData\Local\Programs\Python\Python37-32\lib\genericpath.py", line 50, in getsize
        return os.stat(filename).st_size
    FileNotFoundError: [WinError 2] The system cannot find the file specified: 'input.txt'

我期待包含文件“ input.txt”，但是显然找不到该文件。