ftplib callbacks

[Matija Papec]

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

 

[Steve Holden]

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

 

[Matija Papec]

X-Ftn-To: Steve Holden

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.

Tnx, I did

def nlst2(self, *args):
cmd = 'LIST'
for arg in args:
cmd = cmd + (' ' + arg)
files = []
self.retrlines(cmd, files.append)
return files

and now I just need to parse it.

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

Yes, unfortunately even "def retrlines" returns something uninteresting.