Python rrdtool try catch statement Post: 302782157

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Top Forums Shell Programming and Scripting Python rrdtool try catch statement Post 302782157 by kaf3773 on Monday 18th of March 2013 10:58:04 AM

03-18-2013

Registered User

Python rrdtool try catch statement

I have a Python script that updates an rrd file with data it pulls from a database. Here is a snippet of the Python code

Code:

for i in range(numrowed):
                row = curred.fetchone()
                time_stamp = row[0]
                rx_max = row[1]
 
                ret = rrdtool.update(ds_file.rrd,'%s:%s' %(time_stamp,rx_max)); 
                      if ret:
                         print rrdtool.error()
           i = i + 1

My problem is that the script crashes anytime there is a duplicate time stamp because rrdtool allows only one value per timestamp. Thus i get this error

Traceback (most recent call last):
File "rrdfile_update.py", line 40, in <module>
ret = rrdtool.update(ds_file.rrd,'%s:%s' %(time_stamp,rx_max));
rrdtool.error: ds_file: illegal attempt to update using time 1363358441 when last update time is 1363358441 (minimum one second step)

I will appreciate very much if you can help me with a Python try catch statement to help skip this error and continue to update the rrd file with the next timestamp and value so the script does not stop.

Help very much appreciated. Thanks

kaf3773

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idle

IDLE(1) 						      General Commands Manual							   IDLE(1)

NAME

       IDLE - An Integrated DeveLopment Environment for Python

SYNTAX

       idle [ -dins ] [ -t title ] [ file ...]

       idle [ -dins ] [ -t title ] ( -c cmd | -r file ) [ arg ...]

       idle [ -dins ] [ -t title ] - [ arg ...]

DESCRIPTION

       This  manual page documents briefly the idle command.  This manual page was written for Debian because the original program does not have a
       manual page.  For more information, refer to IDLE's help menu.

       IDLE is an Integrated DeveLopment Environment for Python. IDLE is based on Tkinter, Python's bindings to the Tk widget  set.  Features  are
       100%  pure  Python, multi-windows with multiple undo and Python colorizing, a Python shell window subclass, a debugger. IDLE is cross-plat-
       form, i.e. it works on all platforms where Tk is installed.

OPTIONS

       -h     Print this help message and exit.

       -n     Run IDLE without a subprocess (see Help/IDLE Help for details).

       The following options will override the IDLE 'settings' configuration:

       -e     Open an edit window.

       -i     Open a shell window.

       The following options imply -i and will open a shell:

       -c cmd Run the command in a shell, or

       -r file
	      Run script from file.

       -d     Enable the debugger.

       -s     Run $IDLESTARTUP or $PYTHONSTARTUP before anything else.

       -t title
	      Set title of shell window.

       A default edit window will be bypassed when -c, -r, or - are used.

       [arg]* and [file]* are passed to the command (-c) or script (-r) in sys.argv[1:].

EXAMPLES

       idle   Open an edit window or shell depending on IDLE's configuration.

       idle foo.py foobar.py
	      Edit the files, also open a shell if configured to start with shell.

       idle -est "Baz" foo.py
	      Run $IDLESTARTUP or $PYTHONSTARTUP, edit foo.py, and open a shell window with the title "Baz".

       idle -c "import sys; print sys.argv" "foo"
	      Open a shell window and run the command, passing "-c" in sys.argv[0] and "foo" in sys.argv[1].

       idle -d -s -r foo.py "Hello World"
	      Open a shell window, run a startup script, enable the debugger, and run foo.py, passing "foo.py" in sys.argv[0] and "Hello World" in
	      sys.argv[1].

       echo "import sys; print sys.argv" | idle - "foobar"
	      Open a shell window, run the script piped in, passing '' in sys.argv[0] and "foobar" in sys.argv[1].

SEE ALSO

       python(1).

AUTHORS

       Various.

								 21 September 2004							   IDLE(1)