On Fri, Oct 30, 2020 at 5:16 PM Julio Di Egidio wrote:
> Not to mention, from the point of view of formal verification,
> this is the corresponding annotated version, and it is in fact
> worse than useless:
>
> def abs(x: Any) -> Any:
> ...some code here...
>
Useless because, in the absence of
On Friday, 30 October 2020 05:09:34 UTC+1, Chris Angelico wrote:
> On Fri, Oct 30, 2020 at 1:06 PM Julio Di Egidio wrote:
> > On Sunday, 25 October 2020 20:55:26 UTC+1, Peter J. Holzer wrote:
> > > I think you are trying to use Python in a way contrary to its nature.
> > > Python is a dynamicall
On Fri, Oct 30, 2020 at 1:06 PM Julio Di Egidio wrote:
>
> On Sunday, 25 October 2020 20:55:26 UTC+1, Peter J. Holzer wrote:
> > I think you are trying to use Python in a way contrary to its nature.
> > Python is a dynamically typed language. Its variables don't have types,
> > only its objects.
On Sunday, 25 October 2020 20:55:26 UTC+1, Peter J. Holzer wrote:
> On 2020-10-22 23:35:21 -0700, Julio Di Egidio wrote:
> > On Friday, 23 October 2020 07:36:39 UTC+2, Greg Ewing wrote:
> > > On 23/10/20 2:13 pm, Julio Di Egidio wrote:
> > > > I am now thinking whether I could achieve the "standa
Peter J. Holzer wrote at 2020-10-25 20:48 +0100:
>On 2020-10-22 23:35:21 -0700, Julio Di Egidio wrote:
> ...
>> and the whole lot, indeed why even subclass ABC?
You often have the case that a base class can implement
a lot of functionality based on a few methods defined
by derived classes.
An exa
On 2020-10-22 23:35:21 -0700, Julio Di Egidio wrote:
> On Friday, 23 October 2020 07:36:39 UTC+2, Greg Ewing wrote:
> > On 23/10/20 2:13 pm, Julio Di Egidio wrote:
> > > I am now thinking whether I could achieve the "standard"
> > > behaviour via another approach, say with decorators, somehow
> >
See: https://docs.python.org/3/library/abc.html, that should help you.
-Original Message-
From: Julio Di Egidio
Sent: Thursday, October 22, 2020 12:26 PM
To: [email protected]
Subject: Question on ABC classes
Hello guys,
I am professional programmer but quite new to Python, and I
On Friday, 23 October 2020 07:36:39 UTC+2, Greg Ewing wrote:
> On 23/10/20 2:13 pm, Julio Di Egidio wrote:
> > I am now thinking whether I could achieve the "standard"
> > behaviour via another approach, say with decorators, somehow
> > intercepting calls to __new__... maybe.
>
> I'm inclined to
On 23/10/20 2:13 pm, Julio Di Egidio wrote:
I am now thinking whether I could achieve the "standard"
behaviour via another approach, say with decorators, somehow
intercepting calls to __new__... maybe.
I'm inclined to step back and ask -- why do you care about this?
Would it actually do any ha
On Thursday, 22 October 2020 23:04:25 UTC+2, Ethan Furman wrote:
> On 10/22/20 9:25 AM, Julio Di Egidio wrote:
>
> > Now, I do read in the docs that that is as intended,
> > but I am not understanding the rationale of it: why
> > only if there are abstract methods defined in an ABC
> > class is i
On 10/22/20 9:25 AM, Julio Di Egidio wrote:
Now, I do read in the docs that that is as intended,
but I am not understanding the rationale of it: why
only if there are abstract methods defined in an ABC
class is instantiation disallowed? IOW, why isn't
subclassing from ABC enough?
Let's say yo
On Thu, 22 Oct 2020 at 22:09, Marco Sulla
wrote:
> Not sure because I never tried or needed, but if no @abstractsomething in
> A is defined and your B class is a subclass of A, B should be an abstract
> class, not a concrete class.
>
Now I'm sure:
>>> from abc import ABC, abstractmethod
>>> cla
On Thu, 22 Oct 2020 at 18:31, Julio Di Egidio wrote:
> why
> only if there are abstract methods defined in an ABC
> class is instantiation disallowed?
>
Not sure because I never tried or needed, but if no @abstractsomething in A
is defined and your B class is a subclass of A, B should be an abst
Hello guys,
I am professional programmer but quite new to Python,
and I am trying to get the grips of some peculiarities
of the language.
Here is a basic question: if I define an ABC class,
I can still instantiate the class unless there are
abstract methods defined in the class.
(In the typical
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