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| Date | Wed, 29 Jan 2014 23:23:47 -0700 |
| Subject | Re: Try-except-finally paradox |
| From | Ian Kelly <ian.g.kelly@gmail.com> |
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On Jan 29, 2014 11:01 PM, "Jessica Ross" <deathweasel@gmail.com> wrote:
>
> I found something like this in a StackOverflow discussion.
> >>> def paradox():
> ... try:
> ... raise Exception("Exception raised during try")
> ... except:
> ... print "Except after try"
> ... return True
> ... finally:
> ... print "Finally"
> ... return False
> ... return None
> ...
> >>> return_val = paradox()
> Except after try
> Finally
> >>> return_val
> False
>
> I understand most of this.
> What I don't understand is why this returns False rather than True. Does
the finally short-circuit the return in the except block?
The docs don't seem to specify what happens in this case, but this behavior
is intuitive to me. If the except suite had raised an exception instead of
returning, the return in the finally would suppress that. The generalized
rule appears to be that the control flow specification executed later
overrides the earlier.
Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
Try-except-finally paradox Jessica Ross <deathweasel@gmail.com> - 2014-01-29 21:56 -0800
Re: Try-except-finally paradox Ian Kelly <ian.g.kelly@gmail.com> - 2014-01-29 23:23 -0700
Re: Try-except-finally paradox Andrew Berg <robotsondrugs@gmail.com> - 2014-01-30 00:33 -0600
Re: Try-except-finally paradox Rotwang <sg552@hotmail.co.uk> - 2014-01-30 18:12 +0000
Re: Try-except-finally paradox Ethan Furman <ethan@stoneleaf.us> - 2014-01-30 10:30 -0800
Re: Try-except-finally paradox wxjmfauth@gmail.com - 2014-01-29 22:59 -0800
Re:Try-except-finally paradox Dave Angel <davea@davea.name> - 2014-01-30 07:05 -0500
Re: Try-except-finally paradox Chris Angelico <rosuav@gmail.com> - 2014-01-31 00:02 +1100
Re: Try-except-finally paradox MRAB <python@mrabarnett.plus.com> - 2014-01-30 13:11 +0000
Re: Try-except-finally paradox Chris Angelico <rosuav@gmail.com> - 2014-01-31 00:19 +1100
Re: Try-except-finally paradox Terry Reedy <tjreedy@udel.edu> - 2014-01-31 00:26 -0500
Re: Try-except-finally paradox Göktuğ Kayaalp <self@gkayaalp.com> - 2014-02-01 03:58 +0200
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