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From: "Ivan Evstegneev" <webmailgroups@gmail.com>
To: "'Rob Gaddi'" <rgaddi@technologyhighland.invalid>, <python-list@python.org>
References: <009d01d06723$38860d50$a99227f0$@gmail.com> <meuvkb$e5t$1@ger.gmane.org> <mailman.158.1427313051.10327.python-list@python.org> <mev4he$amn$5@dont-email.me>
In-Reply-To: <mev4he$amn$5@dont-email.me>
Subject: RE: Function Defaults - avoiding unneccerary combinations of arguments at input
Date: Wed, 25 Mar 2015 22:43:44 +0200
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> -----Original Message-----
> From: Python-list [mailto:python-list-
> bounces+webmailgroups=gmail.com@python.org] On Behalf Of Rob Gaddi
> Sent: Wednesday, March 25, 2015 22:07
> To: python-list@python.org
> Subject: Re: Function Defaults - avoiding unneccerary combinations of
> arguments at input
> 
> On Wed, 25 Mar 2015 21:50:40 +0200, Ivan Evstegneev wrote:
> 
> > Hello again ^_^,
> >
> > Googled a bit, and found only one, a "ValueError" exception, but still
> > don't understand how it should be implemented in my case.
> >
> > Should my code look like this one:
> >
> > def  my_fun(history=False, built=False, current=False, topo=None,
> > full=False, file=None):
> > 	try:
> > 		if currnet and full:
> > 			do something_1
> > 		elif current and file:
> > 			do something_2
> > 		elif history and full and file:
> > 			do something_3
> >
> > 	except ValueError:
> > 		print("No valid input! Please try again ...")
> >
> >
> > 	...... some code here..............
> >
> >
> > Or I'm just too optimistic ^_^?
> >
> > Thanks in advance,
> >
> > Ivan.
> >
> 
> A) Please don't top-post.  Put your new stuff below previous context, so
it
> flows in readable order.
> 
> B) You've got the concept backwards.  You're not trying to catch a
ValueError
> because one came up below your function.  Your function was called
> incorrectly, and you're kicking the responsibility for dealing with it
back to the
> guy who got it wrong.
> 
> def my_fun(....):
>     if invalid_argument_combination:
>        raise ValueError('Hey jerk, read the documentation.')
> 
>     # otherwise you do your thing in here.
> 
> 
> --
> Rob Gaddi, Highland Technology -- www.highlandtechnology.com Email
> address domain is currently out of order.  See above to fix.
> --
> https://mail.python.org/mailman/listinfo/python-list




Ok thanks fo the answer. Got it. About top-posting... will need to tweak
Outlook settings.