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Groups > comp.lang.python > #17937

Re: How safe is this way of getting a default that allows None?

Date 2011-12-25 19:14 -0600
From Tim Chase <python.list@tim.thechases.com>
Subject Re: How safe is this way of getting a default that allows None?
References <CAGGBd_rJX1ZOS31mn7SNfkugeMMe5kZpHFA_aVQyCnTPuRdWhg@mail.gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.4087.1324862079.27778.python-list@python.org> (permalink)

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On 12/25/11 18:49, Dan Stromberg wrote:
> How safe is this?  I like the idea.
>
> UNSPECIFIED = object()
>
> def fn(x, y=UNSPECIFIED):
>     if y is UNSPECIFIED:
>        print x, 'default'
>     else:
>        print x, y

safe?  It's idiomatic :)

-tkc

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Re: How safe is this way of getting a default that allows None? Tim Chase <python.list@tim.thechases.com> - 2011-12-25 19:14 -0600

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