try: except <never>:

[Duncan Booth]

Paul Rubin wrote:

> Hallvard B Furuseth <h.b.furuseth at usit.uio.no> writes:
>> > class NeverRaised(Exception): pass
>> > for ex in ZeroDivisionError, NeverRaised:
>> 
>> Heh.  Simple enough.  Unless some obstinate person raises it anyway...
> 
> Hmm, ok, how's this?:
> 
>    def NeverRaised():
>      class blorp(Exception): pass
>      return blorp
>    for ex in ZeroDivisionError, NeverRaised():
>      ...

Or you can create an unraisable exception:

>>> \
class NeverRaised(Exception):
    def __init__(self, *args):
        raise RuntimeError('NeverRaised should never be raised')

>>> \
try:
    raise NeverRaised
except NeverRaised:
    print "caught it"

    

Traceback (most recent call last):
  File "<pyshell#47>", line 4, in __init__
    raise RuntimeError('NeverRaised should never be raised')
RuntimeError: NeverRaised should never be raised