Raising Exceptions

• Simple example

>>> try:
... 	raise NameError, "pretending a NameError occurred"
... except NameError, err:
... 	print "An error occurred: %s" % err
... 
An error occurred: pretending a NameError occurred

• Slightly more complex

>>> try:
... 	raise ValueError, "pretending a ValueError occurred"
... except NameError, err:
... 	print "A NameError occurred: %s" % err
... except ValueError, err:
... 	print "A ValueError occurred: %s" % err
... 
A ValueError occurred: pretending a ValueError occurred