Tarfile中的Python3:f.read（）返回字节而不是类似文件的对象，并传递空文件

Question

我在Python中传递类似于tgz文件的对象的文件时遇到了问题。下面是我的代码的样子：

backup = tarfile.open(backup_file, mode='r:gz')
for f in backup.getmembers():
    if f.name.endswith('.xml'):
        ff = f.name
        backupff = backup.extractfile(ff)
        if backupff:
            backupobj = backupff.read()
backup.close()

问题源于

backupobj = backupff.read()

它给出了这个错误：

AttributeError: 'bytes' object has no attribute 'read'

我在处理zip文件时没有这样的问题

更新

@AKX，你说得对，这不是我正在运行的代码。真正的代码非常大，我不确定是否有人有时间研究它

无论如何，当我运行main函数时，我收到以下错误：

file_read = file.read

AttributeError: 'bytes' object has no attribute 'read'

以下是file.read部分：

def sendfile(self, file, offset=0, count=None):
        """Borrowed from https://github.com/python/cpython/blob/3.6/Lib/socket.py
        and adapted to our needs
        """
        self._check_sendfile_params(file, offset, count)
        if self.request.gettimeout() == 0:
            raise ValueError("non-blocking sockets are not supported")
        if offset:
            file.seek(offset)
        blocksize = min(count, 8192) if count else 8192
        total_sent = 0
        # localize variable access to minimize overhead
        file_read = file.read
        sock_send = self.request.send

Answer 1

我很肯定这不是你正在运行的代码，也不是你正在运行的环境。我无法用Python 3.8重现这一点：

$ echo aaa > 1.xml
$ echo bbb > 2.xml
$ tar czvf a.tar.gz *.xml
a 1.xml
a 2.xml
$ cat x.py
import tarfile

backup_file = 'a.tar.gz'

with tarfile.open(backup_file, mode='r:gz') as backup:
    for member in backup.getmembers():
        if member.name.endswith('.xml'):
            fh = backup.extractfile(member)
            if fh:
                content = fh.read()
                print((member.name, content))
$ python3 x.py
('1.xml', b'aaa\n')
('2.xml', b'bbb\n')