[Tutor] creating a tab delimited filename

C Smith smichr at hotmail.com
Tue Mar 15 16:41:35 CET 2005

On Tuesday, Mar 15, 2005, at 05:01 America/Chicago, 
tutor-request at python.org wrote:

> how am i going to change the filename automaticaly?
> for example:
>         #every 5 minutes, i am going to create a file based on the 
> data above
>  for i in range(100)
>         output_file = file('c:/output' +.join(i) +'.txt', 'w')
> #guess this won't work
>         output_file.writelines(lines)
>         output_file.close()

When faced with this problem, one of the tings that I liked to do was 
use a date stamp for the files. The time module has a function called 
strftime which allows you to use a template to create a string from the 
current time. (See the documentation of python module 'time' for more 
details.)  e.g.

 >>> import time
 >>> time.strftime('%Y%m%d%H%M')

This string can be added to your 'c:/output' rather than a generic 
number like i. Just to be safe you might want to check that the file 
doesn't already exist. The nice thing is that there should be few files 
that have this number added to them so the loop to get a valid name is 
going to succeed quickly.


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