On Fri, Oct 13, 2017, at 02:30, Nick Coghlan wrote:
> Metaclasses currently tend to serve two distinct purposes:
>
> 1. Actually altering the runtime behaviour of a class and its children
>in non-standard ways (e.g. enums, ABCs, ORMs)
> 2. Boilerplate reduction in class definitions, reducing th
>
> Date: Fri, 13 Oct 2017 08:57:00 -0700
> From: Guido van Rossum
> To: Martin Teichmann
> Cc: Python-Dev
> Subject: Re: [Python-Dev] What is the design purpose of metaclasses vs
> code generating decorators? (was Re: PEP 557: Data Classes)
> Message-ID:
> <
> cap7+vjkbvudqf09zt
On 10/13/2017 02:35 AM, Martin Teichmann wrote:
Metaclasses currently tend to serve two distinct purposes:
1. Actually altering the runtime behaviour of a class and its children in
non-standard ways (e.g. enums, ABCs, ORMs)
2. Boilerplate reduction in class definitions, reducing the amount of co
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This is food for thought. I'll have to let it sink in a bit, but you may be
on to something.
Since the question was asked at some point, yes, metaclasses are much older
than class decorators. At some point I found the book Putting Metaclasses
to Work by Ira Forman and Scott Danforth (
https://www.
Hello.
This mailing list is to work on developing Python (adding new
features to Python itself and fixing bugs); if you're having problems
learning, understanding or using Python, please find another forum.
Probably python-list/comp.lang.python mailing list/news group is the
best place; there a
Hi Experts,
Could someone guide me how to use the code in below question(Link).
https://stackoverflow.com/questions/46711909/extract-urls-recursively-from-website-archives-in-scrapy
Thanks,
KK.
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On 13 October 2017 at 19:35, Martin Teichmann
wrote:
> > Metaclasses currently tend to serve two distinct purposes:
> >
> > 1. Actually altering the runtime behaviour of a class and its children in
> > non-standard ways (e.g. enums, ABCs, ORMs)
> > 2. Boilerplate reduction in class definitions, r
While I really can't continue to be active in this discussion now [*], here
are some thoughts based on observations I made:
These three PEPs are all essentially solving an occurrence of the same
problem:
PEP 549 Instance descriptors
PEP 562 Module __getattr__
PEP 560 Core support for generic type
> Metaclasses currently tend to serve two distinct purposes:
>
> 1. Actually altering the runtime behaviour of a class and its children in
> non-standard ways (e.g. enums, ABCs, ORMs)
> 2. Boilerplate reduction in class definitions, reducing the amount of code
> you need to write as the author of t
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