a question about ftplib

[Gabriel G]

At Friday 1/9/2006 06:32, alper soyler wrote:

>Thank you very much for your help. The program works however, after 
>downloading 121 '.pep' files, it gave me time out error:
>
>Traceback (most recent call last):
>   File "ftp1.0.py", line 18, in ?
>     for filename in ftp.nlst():
>   ...
>   File "/usr/lib/python2.4/ftplib.py", line 324, in ntransfercmd
>     conn.connect(sa)
>   File "<string>", line 1, in connect
>socket.error: (110, 'Connection timed out')
>
>How can I continue from the last download or  is there any way to 
>arrange the time? Thank you very much.

You can change the default timeout for sockets with 
socket.setdefaulttimeout(secs) (this is a module function; call it at 
the beginning of your script).
To continue from the last download, you could skip downloading files 
when they already exist on your disk: before opening it for write, 
use os.path.exists(full_filename) to detect it, and skip the download part.

If you want to continue even after an exception happens, use the 
try/except syntax.
I don't have your code at hand to show the details, but it was something like:

for directory in dirlist:
     cwd(directory)
     for filename in directory:
         download file

You may want to change it to:

for directory in dirlist:
     try:
       cwd(directory)
       for filename in directory:
         if (filename already exists): continue
         try:
           download file
         except: print '%s: %s' % sys.exc_info()[:2]
     except: print '%s: %s' % sys.exc_info()[:2]

This way, if an error happens within downloading a file, goes on the 
next; and if an error happens procesing a directory, goes on the next too.
As a general guide, bare except clauses (that is, without a matching 
exception class) are not good, but for an utility script like yours I 
think it's fine.


Gabriel Genellina
Softlab SRL  


	
	
		
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