尽管存在此导入错误，但使用 python 进行 sftp 文件传输工作正常。如何消除这个错误？

发布于 2025-01-12 02:48:08 字数 1266 浏览 13 评论 0原文

我有这个 python 函数通过 sftp 上传文件。效果很好。

def sftp_upload(destination, username, password,
                     remote_loc, source_file):
    import pysftp
    with pysftp.Connection(destination, username,
                           password, log="pysftp.log") as sftp:
        sftp.cwd(remote_loc)
        sftp.put(source_file)

    sftp.close()
    return None

该代码按预期工作。但是，我总是在最后收到此错误 ImportError: sys.meta_path is None, Python is likely shutdown。

如何消除这个错误？我也很困惑为什么尽管出现错误，代码仍能顺利运行到最后。

在日志文件中，我看到以下内容；

INF [20220304-18:49:14.727] thr=2   paramiko.transport.sftp: [chan 0] sftp session closed.
DEB [20220304-18:49:14.727] thr=2   paramiko.transport: [chan 0] EOF sent (0)
DEB [20220304-18:49:14.728] thr=1   paramiko.transport: EOF in transport thread

这是堆栈跟踪；

Exception ignored in: <function Connection.__del__ at 0x000001A8B08765E0>
Traceback (most recent call last):
  File "C:\ProgramData\Anaconda3\lib\site-packages\pysftp\__init__.py", line 1013, in __del__
  File "C:\ProgramData\Anaconda3\lib\site-packages\pysftp\__init__.py", line 795, in close
ImportError: sys.meta_path is None, Python is likely shutting down

我正在使用 python v3.9

原文

I have this python function to upload file through sftp. It works fine.

def sftp_upload(destination, username, password,
                     remote_loc, source_file):
    import pysftp
    with pysftp.Connection(destination, username,
                           password, log="pysftp.log") as sftp:
        sftp.cwd(remote_loc)
        sftp.put(source_file)

    sftp.close()
    return None

The code works as expected. However, I always receive this error at the end ImportError: sys.meta_path is None, Python is likely shutting down.

How to remove this error? I'm also puzzled why code runs smoothly to the end despite the error.

In the log file, I saw the following;

INF [20220304-18:49:14.727] thr=2   paramiko.transport.sftp: [chan 0] sftp session closed.
DEB [20220304-18:49:14.727] thr=2   paramiko.transport: [chan 0] EOF sent (0)
DEB [20220304-18:49:14.728] thr=1   paramiko.transport: EOF in transport thread

Here's the stack trace;

Exception ignored in: <function Connection.__del__ at 0x000001A8B08765E0>
Traceback (most recent call last):
  File "C:\ProgramData\Anaconda3\lib\site-packages\pysftp\__init__.py", line 1013, in __del__
  File "C:\ProgramData\Anaconda3\lib\site-packages\pysftp\__init__.py", line 795, in close
ImportError: sys.meta_path is None, Python is likely shutting down

I am using python v3.9

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〆凄凉。 2025-01-19 02:48:08

_{注意：函数外部的 import pysftp 以某种方式为我解决了问题。}

_{Note: import pysftp outside the function somehow resolves the issue for me. ????}

It's a bug in pysftp==0.2.9.

You can fix it by overriding close() to only run once:

class SFTPConnection(pysftp.Connection):
    def close(self):
        if getattr(self, '_closed', False):
            return
        self._closed = True
        super().close()

Usage:

# with pysftp.Connection(destination, username, password=password, log="pysftp.log") as sftp:  # -
with SFTPConnection(destination, username, password=password, log="pysftp.log") as sftp:       # +

References:

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祁梦 2025-01-19 02:48:08

看起来您的程序在 sftp 对象被垃圾收集之前结束。
然后，在程序拆卸过程中调用 sftp.__del__ 方法，这导致了错误。

来自 pysftp.py 代码：

def __del__(self):
    """Attempt to clean up if not explicitly closed."""
    self.close()

我个人认为应该考虑作为 pysftp 中的一个错误项目。

我可以想到两种解决方法：

重写 __del__ 方法：
pysftp.Connection.__del__ = lambda x：无
（不太推荐 - 效率较低）显式删除sftp对象并触发垃圾收集：
<代码>del sftp;导入气相色谱； gc.collect() 就在 with 块
之后

It looks like your program ends before the sftp object is garbage-collected.
Then, the sftp.__del__ method is called at the middle of the program's teardown, which is causing the error.

From pysftp.py code:

def __del__(self):
    """Attempt to clean up if not explicitly closed."""
    self.close()

I personally think that it should be considered as a bug in the pysftp project.

I can think of two workarounds:

Override the __del__ method:
pysftp.Connection.__del__ = lambda x: None
(Less recomended - less efficient) Explicitly delete the sftp object and trigger garbage collection:
del sftp; import gc; gc.collect() right after the with block

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