mnist_a2j_2pickle.py 文件源码

def maybe_download(filename, expected_bytes):
    """Download a file if not present, and make sure it's the right size."""
    if not os.path.exists(filename):
        print('Downloading ', filename, " ...")
        filename, _ = urlretrieve(url + filename, filename)
        statinfo = os.stat(filename)
        if statinfo.st_size == expected_bytes:
            print('Found and verified', filename)
        else:
            raise Exception('Failed to verify' +
                            filename + '. Can you get to it with a browser?')
    else:
        print('Found and verified', filename)
    return filename