writing a filter in python

[Chris Liechti]

David Bear <david.bear at asu.edu> wrote in news:adm43t$p5j$1 at news.asu.edu:

> I'm writing a filter to be used by lprng.  Since there is no stdout I
> am wondering two things:
> 
> 1) good strategies for showing error message (was thinking of syslog)

i created my own /var/log/myfilter and redirected sys.stdout adn std err to 
that file. that way you don't miss any important exception, which makes 
debuging easier.

> 2) an easy way to catch all exceptions and quickly return back to the 
> caller (lpd)  

try:
    	... your code here
except:
    	traceback.print_exc(file=yourlogfile_or_sysstderr)

why do you need to be quick? i thing lpr only tries to restart your job if 
it doesn't run properly. but when it runs it may take a long time.
(atleast it wrork for my pdf printer, which i controlol through a python 
script and lprng)

chris

> I'm noticing that if my script doesnt run fast enough I may end up
> have lpd try multiple times to run it.  
> 
> Any advice?



-- 
Chris <cliechti at gmx.net>