On Sun, Jan 25, 2015 at 6:49 PM, Brian Gladman wrote:
> Thanks, a part of this was a wish to understand how to map what I can do
> in other languages into Python. I felt that it might just be possible
> in Python to avoid having to wrap all the methods of the base class in
> the derived class. B
On 25/01/2015 00:28, Chris Angelico wrote:
> On Sun, Jan 25, 2015 at 11:18 AM, Brian Gladman 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 R
On 25/01/2015 01:31, Terry Reedy wrote:
> On 1/24/2015 5:57 PM, Brian Gladman wrote:
>> I would appreciate advice on how to set up delgation in Python.
>>
>> I am continuously implementing a function to test whether a Python
>> Fraction is an integer
>
> Since Fractions are reduced to lowest terms
On 1/24/2015 5:57 PM, Brian Gladman wrote:
I would appreciate advice on how to set up delgation in Python.
I am continuously implementing a function to test whether a Python
Fraction is an integer
Since Fractions are reduced to lowest terms,
>>> from fractions import Fraction as F
>>> F(4, 2)
On Sun, Jan 25, 2015 at 11:18 AM, Brian Gladman 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
On 24/01/2015 23:43, Chris Angelico wrote:
> On Sun, Jan 25, 2015 at 10:38 AM, Brian Gladman wrote:
>> On 24/01/2015 23:22, Chris Angelico wrote:
>>> class RF(Fraction):
>>> def is_integer(self):
>>>return self.numerator % self.denominator == 0
>>
>> Thanks for your help on this. I mu
On Sun, Jan 25, 2015 at 10:59 AM, Mark Lawrence wrote:
>> You can always "monkey-path" the Fraction class on the fly to add a new
>> method to it. I think most would consider this a bad idea, but it does
>> work.
>
> As regards this being a bad idea I'd suggest the latest score is
> Practicality
On 24/01/2015 23:47, Gary Herron wrote:
> On 01/24/2015 03:38 PM, Brian Gladman wrote:
>> On 24/01/2015 23:22, Chris Angelico wrote:
>>> class RF(Fraction):
>>> def is_integer(self):
>>> return self.numerator % self.denominator == 0
>> Thanks for your help on this. I must admit that n
On 24/01/2015 23:41, Gary Herron wrote:
On 01/24/2015 03:22 PM, Chris Angelico wrote:
On Sun, Jan 25, 2015 at 9:57 AM, Brian Gladman wrote:
But I am not clear on how to delegate from my new class to the existing
Fraction class. This is what I have:
--
class RF(Fractio
On 24/01/2015 23:41, Gary Herron wrote:
[snip]>
> You can always "monkey-path" the Fraction class on the fly to add a new
> method to it. I think most would consider this a bad idea, but it does
> work.
> Try this:
>
from fractions import Fraction
def is_integer(self):
> ... return
On 01/24/2015 03:38 PM, Brian Gladman wrote:
On 24/01/2015 23:22, Chris Angelico wrote:
class RF(Fraction):
def is_integer(self):
return self.numerator % self.denominator == 0
Thanks for your help on this. I must admit that nowhere in a lot of
searching did I find that delegation
On Sun, Jan 25, 2015 at 10:38 AM, Brian Gladman wrote:
> On 24/01/2015 23:22, Chris Angelico wrote:
>> class RF(Fraction):
>> def is_integer(self):
>>return self.numerator % self.denominator == 0
>
> Thanks for your help on this. I must admit that nowhere in a lot of
> searching did I
On 01/24/2015 03:22 PM, Chris Angelico wrote:
On Sun, Jan 25, 2015 at 9:57 AM, Brian Gladman wrote:
But I am not clear on how to delegate from my new class to the existing
Fraction class. This is what I have:
--
class RF(Fraction):
def __new__(self, x, y):
sup
On 24/01/2015 23:22, Chris Angelico wrote:
> class RF(Fraction):
> def is_integer(self):
>return self.numerator % self.denominator == 0
Thanks for your help on this. I must admit that nowhere in a lot of
searching did I find that delegation is achieved by doing nothing!
Brian
-
On Sun, Jan 25, 2015 at 9:57 AM, Brian Gladman wrote:
> But I am not clear on how to delegate from my new class to the existing
> Fraction class. This is what I have:
>
> --
> class RF(Fraction):
>
> def __new__(self, x, y):
> super().__new__(self, x, y)
>
> def is
I would appreciate advice on how to set up delgation in Python.
I am continuously implementing a function to test whether a Python
Fraction is an integer so I wanted to define a new class, based on
Fraction, that includes this new method.
But I am not clear on how to delegate from my new class to
On Wed, 08 Sep 2010 15:45:46 -0400, Terry Reedy wrote:
[...]
>> Unfortunately, I need to use delegation, not inheritance, and I need to
>> use a new-style class, since I will be using Python 3. How can I do
>> automatic delegation in Python 3? Is my only hope to give up on
e.
Yes, special methods are looked up on the type. So you have to make sure the
type has the methods.
>
> Unfortunately, I need to use delegation, not inheritance, and I need to
> use a new-style class, since I will be using Python 3. How can I do
> automatic delegation in Python
eing the cost.
Unfortunately, I need to use delegation, not inheritance, and I need to
use a new-style class, since I will be using Python 3. How can I do
automatic delegation in Python 3? Is my only hope to give up on the
elegance of automatic delegation, and code all the special methods as
manual
instance,
for new-style classes, but I'm not entirely sure.
Unfortunately, I need to use delegation, not inheritance, and I need to
use a new-style class, since I will be using Python 3. How can I do
automatic delegation in Python 3? Is my only hope to give up on the
elegance of automatic
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