Re: [Python-ideas] JavaScript-Style Object Creation in Python (using a constructor function instead of a class to create objects)

Just one additional word about mixins: we've been inspired by Django's extensive usage of mixins for their class-based views, forms and model classes. For one, we defined more mixins for those classes (like UrlMixin for view classes), and for another we developed our own mixin infrastructure

Re: [Python-ideas] JavaScript-Style Object Creation in Python (using a constructor function instead of a class to create objects)

Hello, I'm an attrs contributor so maybe I can clear up any questions. Convert callables are only called in __init__, not in the setters. We've had this requested a number of times and we will almost certainly support it in the future, probably on an opt-in basis. The reason we don't currently

Re: [Python-ideas] JavaScript-Style Object Creation in Python (using a constructor function instead of a class to create objects)

Hi Guido, Yes indeed, *only* invoked by __init__ . See my test below. = import attr @attr.s class Foo: x = attr.ib(convert=str) foo = Foo(42) print(repr(foo.x)) # prints '42' foo.x = 42 print(repr(foo.x)) # prints 42 == Not sure if this is a good design but it matches the docs.

Re: [Python-ideas] JavaScript-Style Object Creation in Python (using a constructor function instead of a class to create objects)

So it is only called by __init__ and not by __setattr__? On Fri, May 19, 2017 at 11:32 AM, Stephan Houben wrote: > Let me quote the attrs docs: > > "" > convert (callable) – callable() that is called by attrs-generated __init__ > methods to convert attribute’s value to the

Re: [Python-ideas] Data Classes

On 19.05.2017 04:37, Eric V. Smith wrote: On 5/18/17 2:26 PM, Sven R. Kunze wrote: On 17.05.2017 23:29, Ivan Levkivskyi wrote: the idea is to write it into a PEP and consider API/corner cases/implementation/etc. Who's writing it? Guido, Hynek, and I met today. I'm writing up our notes, and