Python TypeError：'type'对象不可订阅

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'])

我明白了：

TypeError: 'type' object is not subscriptable

有什么想法吗？

Answer 1

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