very hard for me to understand the difference between
try...except and try...finally
try...except and try...finally
-
-
Re: about try statement
Shi Mu enlightened us with:[color=blue]
> very hard for me to understand the difference between try...except
> and try...finally[/color]
Within a 'try' block, if an exception is called and a matching
'except' block is found, that block will be used to handle the
expression.
From the documentation of the "return" keyword: "When return passes
control out of a try statement with a finally clause, that finally
clause is executed before really leaving the function." Note that
there is no talk about exceptions in this.
Sybren
--
The problem with the world is stupidity. Not saying there should be a
capital punishment for stupidity, but why don't we just take the
safety labels off of everything and let the problem solve itself?
Frank Zappa
-
Re: about try statement
On Sat, 12 Nov 2005 10:20:08 +0100, Sybren Stuvel <sybrenUSE@YOUR thirdtower.com. imagination> wrote:
[color=blue]
>Shi Mu enlightened us with:[color=green]
>> very hard for me to understand the difference between try...except
>> and try...finally[/color]
>
>Within a 'try' block, if an exception is called and a matching
>'except' block is found, that block will be used to handle the
>expression.
>
>From the documentation of the "return" keyword: "When return passes
>control out of a try statement with a finally clause, that finally
>clause is executed before really leaving the function." Note that
>there is no talk about exceptions in this.
>[/color]
Which is because in the finally block the exception is still "live"
and will take effect as soon as the finally block is left, e.g.,
[color=blue][color=green][color=darkred]
>>> try:[/color][/color][/color]
... try: 1/0
... finally: print 'exception can not bypass finally'
... except Exception, e:
... print '%s: %s' %(e.__class__._ _name__, e)
...
exception can not bypass finally
ZeroDivisionErr or: integer division or modulo by zero
Or to make the point about return[color=blue][color=green][color=darkred]
>>> def foo(den):[/color][/color][/color]
... try:
... try: return 1/den
... finally: print 'exception can not bypass finally'
... except Exception, e:
... print '%s: %s' %(e.__class__._ _name__, e)
... return 'succeeded in returning something'
...[color=blue][color=green][color=darkred]
>>> foo(0)[/color][/color][/color]
exception can not bypass finally
ZeroDivisionErr or: integer division or modulo by zero
'succeeded in returning something'[color=blue][color=green][color=darkred]
>>> foo(1)[/color][/color][/color]
exception can not bypass finally
1
Regards,
Bengt Richter
Comment
Comment