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From: ram@zedat.fu-berlin.de (Stefan Ram)
Newsgroups: comp.lang.python
Subject: Re: how to discover what values produced an exception?
Date: 4 May 2024 14:15:02 GMT
Organization: Stefan Ram
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ram@zedat.fu-berlin.de (Stefan Ram) wrote or quoted:
>Sometimes you really need those values. If they're values of global
>names, you can kind of get them in the IDLE shell up to a point.

  The way I see it, the issue here isn't just on Python,
  the language - it's also on us, the coders! I mean, when 
  I define my own function, I can roll with something like:
 
def function( value ):
    if value > 0:
        return log( value )
    else:
        raise ZeroDivisionError( 'domain error' )

print( function( -1 ))

  . Or I can go with something like this:

def function( value ):
    if value > 0:
        return log( value )
    else:
        message = 'domain error: '
        message += '\nThe argument value was: '+ repr( value ) + '.'
        message += '\nbut a value > 0 was expected.'
        raise ZeroDivisionError( message )

print( function( -1 ))

  . And you know what? The second option's gonna give you this output:

ZeroDivisionError: math domain error: 
The argument value was: -1.
but a value > 0 was expected.

  .