gethostbyaddr()

Edward Manning ejmmanning at gmail.com
Mon Jul 28 23:45:31 CEST 2014


Chris 

Thank you for the info.  I figure it out. But thank you again.

Ed 
> On Jul 28, 2014, at 5:42 PM, Chris Kaynor <ckaynor at zindagigames.com> wrote:
> 
> On Mon, Jul 28, 2014 at 2:33 PM, Edward Manning <ejmmanning at gmail.com> wrote:
> I wrote this code, but it seem to work fine if I only have one ip in the file. When I have more than one IP in the file 
> I get a error. Does anyone have an idea why.    
> 
> It would be helpful to know what the error you are getting is. It is also a good idea to generally provide the Python version and OS version with your messages, as they can often make a major difference. As it is, I've made my best guess below (in bold), I've also included some other notes that may cause issues, but I doubt are causing your error.
>  
> import socket
>  
>  
> def main():
>  
>     # get file names
>     infileName = input ("What file our the IP adderss in?  ")
>     outfileName = input("What file should the results go in?")
>  
>     # open files
>     infile = open(infileName, "r")
>     outfile = open(outfileName, "w")
> 
> While this shouldn't cause the issue your reporting (without other issues going on), Its generally a better idea to use the with statement to open file, like so:
> with open(infileName, "r") as infile:
>     # code that needs infile goes here.
> 
> This will ensure that the file is closed when you are done with it, even if an error occurs in the code that may prevent the code from running to completion.
>  
>  
>  
>     #Proccess each line of the input file
>  
>     for line in infile:
>         ipAddress = line.strip()
> 
> I'm guessing that, when you only have one IP, you do not have a trailing new-line in the file, but when you put more than one in the file, you have a trailing new-line. You can try adding:
> 
> if not ipAddress:
>     continue
> 
> here to ignore any empty lines (due to the line.strip() above, it will also ignore all white-space lines) you might get. This may be the cause of your error...
>  
>         resluts = socket.gethostbyaddr(ipAddress)
>         print(resluts[0],resluts[2], end="")
> 
> Note that this does not seem to be printing into outfile (its printing to stdout instead). I presume this is for debugging purposes.
>  
> --
> https://mail.python.org/mailman/listinfo/python-list

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