gzip python模块给出了空字节

Question

我使用fabric将一个.gz文件复制到远程机器上。当我尝试读取同一个远程文件时，会显示空字节。

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()

它给出了以下O/p:

b''

我在远程计算机上进行了验证，并且文件中存在内容。

有人能告诉我如何解决这个问题吗。

Answer 1

fabric_connect写入fd，将文件指针留在文件末尾。在将文件交给GzipFile之前，您需要倒带到BytesIO文件的前面。

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()