我可以使用Python将内存中的对象上传到FTP吗？ [英] Can I upload an object in memory to FTP using Python?

问题描述

这是我现在正在做的事情：

Here's what I'm doing now:

mysock = urllib.urlopen('http://localhost/image.jpg')
fileToSave = mysock.read()
oFile = open(r"C:\image.jpg",'wb')
oFile.write(fileToSave)
oFile.close
f=file('image.jpg','rb')
ftp.storbinary('STOR '+os.path.basename('image.jpg'),f)
os.remove('image.jpg')

将文件写入磁盘然后立即删除它们似乎应该避免在系统上做额外的工作。我可以使用Python将内存中的一个对象上传到FTP吗？

Writing files to disk and then imediately deleting them seems like extra work on the system that should be avoided. Can I upload an object in memory to FTP using Python?

推荐答案

由于 duck-typing ，文件对象（代码中的 f ）只需要支持 .read（blocksize）调用与 storbinary 一起使用。当遇到这样的问题时，我会转到源代码，在这种情况下是lib / python2.6 / ftplib.py：

Because of duck-typing, the file object (f in your code) only needs to support the .read(blocksize) call to work with storbinary. When faced with questions like this, I go to the source, in this case lib/python2.6/ftplib.py:

def storbinary(self, cmd, fp, blocksize=8192, callback=None):
    """Store a file in binary mode.  A new port is created for you.

    Args:
      cmd: A STOR command.
      fp: A file-like object with a read(num_bytes) method.
      blocksize: The maximum data size to read from fp and send over
                 the connection at once.  [default: 8192]
      callback: An optional single parameter callable that is called on
                on each block of data after it is sent.  [default: None]

    Returns:
      The response code.
    """
    self.voidcmd('TYPE I')
    conn = self.transfercmd(cmd)
    while 1:
        buf = fp.read(blocksize)
        if not buf: break
        conn.sendall(buf)
        if callback: callback(buf)
    conn.close()
    return self.voidresp()

正如评论，它只需要一个类文件对象，实际上它甚至不是特别像文件一样，它只需要读（n）的。 StringIO 提供这种内存文件服务。

As commented, it only wants a file-like object, indeed it not even be particularly file-like, it just needs read(n). StringIO provides such "memory file" services.

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