python - Python TypeError：“类型”对象不可下标

Question

我编写了一个简单的 for 循环来提取目录中的所有 mps 文件。

for root, dirs, files in os.walk(rootDir, topdown='true'):
    # filter the file names
    for filename in files:
        print(filename);  # this prints out filenames as expected
    print([file for filename in files if file[-4:] == '.mp3'])

我得到：

TypeError: 'type' object is not subscriptable

有任何想法吗？

Answer 1

print([filename for filename in files if filename[-4:] == '.mp3'])