[issue1248] ftplib needs a rewrite to use bytes/buffers

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

- retrbinary() and storbinary() uses bytes (byte strings)
 - retrlines() and storlines() uses str (unicode strings) with 
charset=self.encoding
 - command is an unicode string converted to byte string with 
charset=self.encoding

So it's already possible to receive/send raw bytes, and forget my 
previous message.

I see a potential but minor problem: if the server is running a POSIX 
OS, it's not possible to open / rename / unlink a file with an invalid 
name. ftp might allow bytes filename, but I prefer to leave ftplib 
unchanged. If your FTP server is broken, fix your file system, fix your 
configuration or use an old FTP client to fix the problem.

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<http://bugs.python.org/issue1248>
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