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| References | <FeCdnXdsTpunvlnJnZ2dnUVZ8judnZ2d@brightview.co.uk> <mailman.18106.1422141738.18130.python-list@python.org> <5ZKdnd6rbdZ3sVnJnZ2dnUVZ8mCdnZ2d@brightview.co.uk> <mailman.18109.1422143020.18130.python-list@python.org> <K8KdncuoKPL1q1nJnZ2dnUVZ8h2dnZ2d@brightview.co.uk> |
|---|---|
| Date | 2015-01-25 11:28 +1100 |
| Subject | Re: Delegation in Python |
| From | Chris Angelico <rosuav@gmail.com> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.18116.1422145722.18130.python-list@python.org> (permalink) |
On Sun, Jan 25, 2015 at 11:18 AM, Brian Gladman <noone@nowhere.net> wrote:
> Is there a way of doing delegation rather than sub-classing?
>
> That is, can I create a class (say RF) that passes some of its methods
> to Fraction for implementation but always returns an RF?
Hmm. The key here is that you want more than just delegation; you want
to transform every return value. That's not going to be easy. It would
be easiest and cleanest to skip the whole thing, and have a separate
function for what you're doing here - not a method, a stand-alone
function.
def is_integer(fr):
return fr.numerator % fr.denominator == 0
Next best would be the monkey-patching option. Delegation with
transformation is a lot of effort for what you want.
ChrisA
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Delegation in Python Brian Gladman <noone@nowhere.net> - 2015-01-24 22:57 +0000
Re: Delegation in Python Chris Angelico <rosuav@gmail.com> - 2015-01-25 10:22 +1100
Re: Delegation in Python Brian Gladman <noone@nowhere.net> - 2015-01-24 23:38 +0000
Re: Delegation in Python Chris Angelico <rosuav@gmail.com> - 2015-01-25 10:43 +1100
Re: Delegation in Python Brian Gladman <noone@nowhere.net> - 2015-01-25 00:18 +0000
Re: Delegation in Python Chris Angelico <rosuav@gmail.com> - 2015-01-25 11:28 +1100
Re: Delegation in Python Brian Gladman <noone@nowhere.net> - 2015-01-25 07:49 +0000
Re: Delegation in Python Chris Angelico <rosuav@gmail.com> - 2015-01-25 19:07 +1100
Re: Delegation in Python Gary Herron <gherron@digipen.edu> - 2015-01-24 15:47 -0800
Re: Delegation in Python Brian Gladman <noone@nowhere.net> - 2015-01-24 23:58 +0000
Re: Delegation in Python Gary Herron <gherron@digipen.edu> - 2015-01-24 15:41 -0800
Re: Delegation in Python Brian Gladman <noone@nowhere.net> - 2015-01-24 23:52 +0000
Re: Delegation in Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-01-24 23:59 +0000
Re: Delegation in Python Chris Angelico <rosuav@gmail.com> - 2015-01-25 11:07 +1100
Re: Delegation in Python Terry Reedy <tjreedy@udel.edu> - 2015-01-24 20:31 -0500
Re: Delegation in Python Brian Gladman <noone@nowhere.net> - 2015-01-25 07:43 +0000
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