Re: How to catch error messages in ftplib?

2013-11-19 Thread Chris Angelico
On Tue, Nov 19, 2013 at 9:18 PM, JL  wrote:
> I have the following code;
>
> try:
> session = FTP(ftp_server_ip,ftp_user,ftp_password)
> file = open(filename,'rb') # file to send
> session.storbinary('STOR ' +  filename, file) # send the file
> except Exception, errObj:
> print Exception
> print errObj
> file.close() # close file and FTP
> session.quit()
>
> I deliberately placed an invalid ip address for the ftp_server_ip to see 
> whether error messages can be caught. However, no exception was thrown. Can 
> someone more experienced point to me what did I do wrong?
>

My first suggestion would be to get rid of the try/except block - it's
not really helping you. Just let the exception be displayed. When I
try that, I get a variety of different errors, depending on what sort
of "invalid IP address" was used - if it's malformed
("192.168.1.2.3"), I get a DNS failure, if it's a computer that
doesn't exist but ought to be on my LAN ("192.168.0.2"), I get a
timeout, and if it's one that exists but doesn't have an FTP server
running ("192.168.0.3"), I get a connection refusal. Exactly what I'd
expect to see. Removing the try/except will show what's happening.

ChrisA
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Re: How to catch error messages in ftplib?

2013-11-19 Thread JL
I repost the original code segment to make it more complete;

from ftplib import FTP
try:
session = FTP(ftp_server_ip,ftp_user,ftp_password)
file = open(filename,'rb') # file to send
session.storbinary('STOR ' +  filename, file) # send the file
except Exception, errObj:
print Exception
print errObj
file.close() # close file and FTP
session.quit()

On Tuesday, November 19, 2013 6:18:07 PM UTC+8, JL wrote:
> I have the following code;
> 
> 
> 
> try:
> 
> session = FTP(ftp_server_ip,ftp_user,ftp_password)
> 
> file = open(filename,'rb') # file to send
> 
> session.storbinary('STOR ' +  filename, file) # send the file
> 
> except Exception, errObj:
> 
> print Exception
> 
> print errObj
> 
> file.close() # close file and FTP
> 
> session.quit()
> 
> 
> 
> I deliberately placed an invalid ip address for the ftp_server_ip to see 
> whether error messages can be caught. However, no exception was thrown. Can 
> someone more experienced point to me what did I do wrong?
> 
> 
> 
> Thank you.
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How to catch error messages in ftplib?

2013-11-19 Thread JL
I have the following code;

try:
session = FTP(ftp_server_ip,ftp_user,ftp_password)
file = open(filename,'rb') # file to send
session.storbinary('STOR ' +  filename, file) # send the file
except Exception, errObj:
print Exception
print errObj
file.close() # close file and FTP
session.quit()

I deliberately placed an invalid ip address for the ftp_server_ip to see 
whether error messages can be caught. However, no exception was thrown. Can 
someone more experienced point to me what did I do wrong?

Thank you.
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