Groups > comp.lang.python > #92041

Re: Argument Presence Checking via Identity or Boolean Operation?

From	Peter Otten <__peter__@web.de>
Subject	Re: Argument Presence Checking via Identity or Boolean Operation?
Date	2015-06-04 11:28 +0200
Organization	None
References	<CAAKgPaGY_4yB7z=R-UO=s5TEWwEXZsE1nSEXw00sQPMfH_Xt2g@mail.gmail.com> <mkp10p$n0l$1@ger.gmane.org> <mkp2ie$glr$1@ger.gmane.org>
Newsgroups	comp.lang.python
Message-ID	<mailman.154.1433410181.13271.python-list@python.org> (permalink)

Show all headers | View raw

Frank Millman wrote:

> I have a slight variation in that I want to keep a reference to the
> argument -
> 
> def __init__(self, arg=None):
>     self.arg = arg or []
> 
> Based on your comment, I have changed it to -
> 
> def __init__(self, arg=None):
>     self.arg = [] if arg is None else arg
> 
> Does this pass your 'stop and consider' test?

Yes, that avoids the problem of the original code.

Back to comp.lang.python | Previous | Next | Find similar | Unroll thread

Thread

Re: Argument Presence Checking via Identity or Boolean Operation? Peter Otten <__peter__@web.de> - 2015-06-04 11:28 +0200

csiph-web