[Tutor] FTP from mainframe

[Steve Bricker]

BODY { font-family:Arial, Helvetica, sans-serif;font-size:12px;
}This is my first attempt to FTP a file from a mainframe. The code:
import ftplib
session = ftplib.FTP('company.lan.com','userid','passwd')
myfile = open('PC.filename','w')
session.retrlines("RETR 'mainframe.filename'", myfile)
myfile.close()
session.quit()
The resulting error is:
Traceback (most recent call last):
File "ftp_from_mf.py", line 5, in
session.retrlines("RETR 'mainframe.filename'", myfile)
File "c:python26libftplib.py", line 428, in retrlines
callback(line)
TypeError: 'file' object is not callable

Not sure what I'm missing.
Steve Bricker

[bob gailer]

Post by Steve Bricker
import ftplib
session = ftplib.FTP('company.lan.com','userid','passwd')
myfile = open('PC.filename','w')
session.retrlines("RETR 'mainframe.filename'", myfile)
myfile.close()
session.quit()
File "ftp_from_mf.py", line 5, in <module>
session.retrlines("RETR 'mainframe.filename'", myfile)
File "c:\python26\lib\ftplib.py", line 428, in retrlines
callback(line)
TypeError: 'file' object is not callable

According to the ftplib module documentation:

retrlines(command[, callback])
Retrieve a file or directory listing in ASCII transfer mode. command
should be an appropriate RETR command (see retrbinary()) or a command
such as LIST, NLST or MLSD (usually just the string 'LIST'). The
callback function is called for each line, with the trailing CRLF
stripped. The default callback prints the line to sys.stdout.

IOW callback must be a function. You are passing a file object. I will
guess that you want:

def writer(line):
myfile.write(line + '\n')

session.retrlines("RETR 'mainframe.filename'", writer)

The documentation is in error in that it does not explicitly state that
a line is passed to the callback function as an argument. I am assuming
that is the case.

[Bill Campbell]

Post by Steve Bricker
import ftplib

The easiest way I've found to get a file via ftp in python is to
user urllib, not ftplib. Something like this (add error checking).

import urllib, os
fname='something.pdf'
url = 'ftp://%s@%s:%s/%s' % ('john', 'secret', 'example.com', fname)
# f will have a temporary file name, and h the headers
(f, h) = urllib.urlretrieve(url)
os.rename(f, fname)

Of course this works for http by simply changing the url.

Bill
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[Alan Gauld]

Post by Steve Bricker
}This is my first attempt to FTP a file from a mainframe.

Thats one more than me!

Post by Steve Bricker
session.retrlines("RETR 'mainframe.filename'", myfile)
File "c:python26libftplib.py", line 428, in retrlines
callback(line)
TypeError: 'file' object is not callable

The error says that its expecting a callable and you are
passing a file object. My guess is you need to create a
function that writes to the file and pass that to ftp.
You could use myfile.write maybe - thats what the
documentation does for a binary file...

HTH,

[Christian Witts]

Post by Steve Bricker
import ftplib
session = ftplib.FTP('company.lan.com','userid','passwd')
myfile = open('PC.filename','w')
session.retrlines("RETR 'mainframe.filename'", myfile)
myfile.close()
session.quit()
File "ftp_from_mf.py", line 5, in <module>
session.retrlines("RETR 'mainframe.filename'", myfile)
File "c:\python26\lib\ftplib.py", line 428, in retrlines
callback(line)
TypeError: 'file' object is not callable
Not sure what I'm missing.
Steve Bricker
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When I'm retrieving items I use retrbinary for eg.

from ftplib import FTP

ftp = FTP(url, username, password)
for filename in ftp.nlst(''):
ftp.retrbinary('RETR %s' % filename, open(filename, 'wb').write)
ftp.delete(filename)

ftp.close()

I hope that helps.
--
Kind Regards,
Christian Witts
Business Intelligence

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[Alan Gauld]

Post by Christian Witts
When I'm retrieving items I use retrbinary for eg.

The only issue with that is that if this is a real big-iron mainframe
then ftp can translate EBCDIC to ASCII during the transfer whereas
binary will, I think, bring the original file across untranslated.
So you would have the extra decoding step to do manually.
But binary transfer does simplify the transfer process.

But if its not an EBCDIC machine then I'd definitely consider
binary transfer for ftp.