Jm lists wrote:
> Please help with this script:
>
> class ShortInputException(Exception):
> '''A user-defined exception class.'''
> def __init__(self,length,atleast):
> Exception.__init__(self)
> self.length=length
> self.atleast=atleast
>
> try:
> s=raw_input('Enter something --> ')
> if len(s)<3:
> raise ShortInputException(len(s),3)
> # Other work can continue as usual here
> except EOFError:
> print '\nWhy did you do an EOF on me?'
> except ShortInputException,x:
> print 'ShortInputException: The input was of length %d, was
> expecting at least %d' %(x.length,x.atleast)
> else:
> print 'No exception was raised.'
>
>
> My questions are:
>
> 1) ShortInputException,x: what's the 'x'? where is it coming?
It's the actual ShortInputException instance that was raised. Try printing
x.length and x.atleast, for example.
> 2) The 'if' and 'else' are not in the same indent scope,why this can work?
This else: clause goes with the try: and except: clauses, not the if: clause. It
is executed if no exception was raised.
http://docs.python.org/ref/try.html
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
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