python-rrdtool try except rrdtool.error module object has no attribute error

[kaf3773]

I have this code that gives this error on Linux and will be grateful if you can help

import rrdtool

try:      
      ret_asd = rrdtool.update(myfile.rrd,'N:%s:%s' %(metric1, metric2));    
except rrdtool.error, e:
      print e

When i run the above i get the below error

except rrdtool.error, e:
AttributeError: 'module' object has no attribute 'error'

The code is intended to skip the below error

illegal attempt to update using time 1363358441 when last update time is 1363358441 (minimum one second step)

Appreciate if you can help me get a solution for this

Thanks