ftplib callbacks

[Steve Holden]

Matija Papec wrote:

> I would like to reimplement ftplib "nlst" using ftplib.dir (ftp server
> doesn't support nlst) so I'm trying to guess how to use ftp callbacks.
> Any help is appreciated.
> tia!
> 
> ============
> #!/usr/bin/python
> 
> # nlst vs list
> 
> import pprint
> pp = pprint.PrettyPrinter(indent=4)
> 
> import ftplib
> 
> def myfilter(line):
>         return line
> 
> ftp = ftplib.FTP("localhost")
> ftp.login("mpapec", "island88")
> #print ftp.retrlines("LIST")
> dir = ftp.dir("", myfilter)
> print dir
> 
> 
The callback is called each time the FTP client softwrae has something 
to deal with. Try (untested):

lines = []

def myfilter(line):
     global lines
     lines.append(line)

with the remainder of your code unchanged. The lines list will then 
contain a list of all lines.

The problem with your current callback is that its return value is 
ignored by the FTP module that calls it.

regards
  Steve
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