Downloading from an ftp using Python

Question

I have a piece of code in Python to download files from an ftp. The code downloads the very first file in the list of available days but fails to download the second. What could be the problem?

import os, ftplib 
destdir='D:\precipitation\dl' 
ftp = ftplib.FTP('ftp.itc.nl')  
ftp.login('anonymous', '') 
ftp.cwd('pub/mpe/msg') 
available_days=['summsgmpe_20100101.zip','summsgmpe_20100102.zip', 'summsgmpe_20100103.zip', 'summsgmpe_20100104.zip', 'summsgmpe_20100105.zip', 'summsgmpe_20100106.zip', 'summsgmpe_20100107.zip', 'summsgmpe_20100108.zip'] 
hdfs = list() 
for day in available_days : 
    file = available_days[available_days.index(day)] 
    print 'file=', file 
    local_file = os.path.join(destdir, file) 
    ftp.retrbinary('RETR %s' %file, open(local_file, 'wb').write) 
    hdfs.append(os.path.abspath(local_file)) 
    ftp.cwd('..')  
ftp.quit()

As an aside, the line file = available_days[available_days.index(day)] could be replaced with file = day. Better yet, just use for file in available_days: and drop the following line altogether. — Mark Amery
– Mark Amery, Commented Nov 23, 2012 at 20:25
ftplib.error_perm: 550 The system cannot find the file specified. — Farhad Irani
– Farhad Irani, Commented Nov 23, 2012 at 20:28

McPherrinM · Accepted Answer · 2012-11-23 20:27:38Z

3

Remove your call to ftp.cwd(..)

That's moving up a directory for each iteration of the list, instead of staying in the correct folder where the files are.

answered Nov 23, 2012 at 20:27

McPherrinM

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