如何在Python中使用ftplib上传二进制文件？

Question

我的python2脚本用这种方法上传文件很顺利，但在python3中遇到了问题，我不知道接下来该怎么做（网上搜索也没找到解决办法）。

from ftplib import FTP
ftp = FTP(ftp_host, ftp_user, ftp_pass)
ftp.storbinary('STOR myfile.txt', open('myfile.txt'))

我遇到的错误是

Traceback (most recent call last):
  File "/Library/WebServer/CGI-Executables/rob3/functions/cli_f.py", line 12, in upload
    ftp.storlines('STOR myfile.txt', open('myfile.txt'))
  File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/ftplib.py", line 454, in storbinary
    conn.sendall(buf)
TypeError: must be bytes or buffer, not str

我尝试修改代码为

from ftplib import FTP
ftp = FTP(ftp_host, ftp_user, ftp_pass)
ftp.storbinary('STOR myfile.txt'.encode('utf-8'), open('myfile.txt'))

但结果却是这个

Traceback (most recent call last):
  File "/Library/WebServer/CGI-Executables/rob3/functions/cli_f.py", line 12, in upload
    ftp.storbinary('STOR myfile.txt'.encode('utf-8'), open('myfile.txt'))
  File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/ftplib.py", line 450, in storbinary
    conn = self.transfercmd(cmd)
  File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/ftplib.py", line 358, in transfercmd
    return self.ntransfercmd(cmd, rest)[0]
  File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/ftplib.py", line 329, in ntransfercmd
    resp = self.sendcmd(cmd)
  File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/ftplib.py", line 244, in sendcmd
    self.putcmd(cmd)
  File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/ftplib.py", line 179, in putcmd
    self.putline(line)
  File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/ftplib.py", line 172, in putline
    line = line + CRLF
TypeError: can't concat bytes to str

有没有人能给我指个方向？

Answer 1

在FTP中向文件追加内容。

注意： 这不是SFTP - 只是FTP

import ftplib
ftp = ftplib.FTP('localhost')
ftp.login ('user','password')
fin = open ('foo.txt', 'r')
ftp.storbinary ('APPE foo2.txt', fin, 1)

参考： 感谢Noah

Answer 2

问题不在于命令的参数，而是在于文件对象。因为你要存储的是二进制数据，所以打开文件时需要使用 'rb' 这个标志：

>>> ftp.storbinary('STOR myfile.txt', open('myfile.txt', 'rb'))
'226 File receive OK.'