>>> try:
...     x = 1/0.3
...     print 'reciprocal of 0.3 is', x
...     x = 1/0.0
...     print 'reciprocal of 0.0 is', x
... except:
...     print 'error: no reciprocal'
reciprocal of 0.3 is 3.33333333333
error: no reciprocal