gzip python 模块给出空字节

Question

我使用 Fabric 将一个 .gz 文件复制到远程计算机。当我尝试读取同一个远程文件时，显示空字节。

下面是我用来从远程机器读取zip文件的python代码。

try:
      fabric_connection = Connection(host = host_name, connect_kwargs = {'key_filename' : tmp_id, 'timeout' : 10})
      
      fd = io.BytesIO()
      remote_file = '/home/test/' + 'test.txt.gz'
      fabric_connection.get(remote_file, fd)

      with gzip.GzipFile(mode = 'rb', fileobj = fd) as fin:
         content = fin.read()
         print(content)
         decoded_content = content.decode()
         print(decoded_content)

   except BaseException as err:
      assert not err

   finally:
      fabric_connection.close()

给出以下 O/P：

b''

我在远程计算机上进行了验证，内容存在于文件中。

有人可以告诉我如何解决这个问题吗？

Answer 1

fabric_connect

写入

fd

，将文件指针保留在文件末尾。您需要先倒回到

BytesIO

文件的前面，然后再将其交给

GzipFile

。

try:
    fabric_connection = Connection(host = host_name, connect_kwargs = {'key_filename' : tmp_id, 'timeout' : 10})
  
    fd = io.BytesIO()
    remote_file = '/home/test/' + 'test.txt.gz'
    fabric_connection.get(remote_file, fd)

    fd.seek(0)

    with gzip.GzipFile(mode = 'rb', fileobj = fd) as fin:
        content = fin.read()
    print(content)
    decoded_content = content.decode()
    print(decoded_content)

except BaseException as err:
    assert not err

finally:
    fabric_connection.close()