> Aha, that's useful to know. So it's a no-no to subclass *any* builtin?
I don't think it's a no-no, I just think it comes with a few problems that are
solved if you subclass the classes that are *meant* to be subclassed, like
UserDict, UserList, or UserString.
> I checked collections.UserDict
> Date: Fri, 9 Oct 2015 01:14:05 -0500
> From: eryk...@gmail.com
> To: tutor@python.org
> Subject: Re: [Tutor] FrozenDict
>
> On 10/8/15, Steven D'Aprano wrote:
>>
>> That's one solution, but it is certainly
> Date: Thu, 8 Oct 2015 11:47:41 +1100
> From: st...@pearwood.info
> To: tutor@python.org
> Subject: Re: [Tutor] FrozenDict
>
> On Wed, Oct 07, 2015 at 04:10:20PM +, Albert-Jan Roskam wrote:
>> Hi,
>> I wanted to create
> From: a...@alexchabot.net
> To: tutor@python.org
> Date: Wed, 7 Oct 2015 18:54:42 +0200
> Subject: Re: [Tutor] FrozenDict
>
> Hi Albert-Jan,
> As far as I know, the recommended object to subclass when subclassing a
> `dict` is
On 10/8/15, Steven D'Aprano wrote:
>
> That's one solution, but it is certainly possible for the class to be
> its own iterator, in which case it needs to follow two rules:
>
> (1) self.__next__() needs to return the next value, or raise
> StopIteration;
>
> (2) self.__iter__() needs to return sel
On Thu, Oct 08, 2015 at 12:03:28PM +0100, Oscar Benjamin wrote:
> On 8 October 2015 at 01:47, Steven D'Aprano wrote:
> > In 3.3, you will have a problem that FrozenDict is not a proper
> > iterator. You can't set self.__next__ = self.next, that won't work.
> > Dunder methods have to be on the clas
On 8 October 2015 at 01:47, Steven D'Aprano wrote:
> In 3.3, you will have a problem that FrozenDict is not a proper
> iterator. You can't set self.__next__ = self.next, that won't work.
> Dunder methods have to be on the class, not on the instance, so instead
> of making the assignment in the __i
On Wed, Oct 07, 2015 at 04:10:20PM +, Albert-Jan Roskam wrote:
> Hi,
> I wanted to create a read-only dict to hold some constants. I looked around
> on the internet and created two implementations:-FrozenDict (derives from
> collections.mapping)-ChillyDict (derives from dict, which seems more
Hi Albert-Jan,
As far as I know, the recommended object to subclass when subclassing a `dict`
is `UserDict`. In Python 3, it's in `collections.UserDict` and in Python 2 is
in `UserDict.UserDict`.
Here's an basic example of how it would work:
try:
from collections import UserDict
except Impo
> From: sjeik_ap...@hotmail.com
> To: tutor@python.org
> Date: Wed, 7 Oct 2015 16:10:20 +
> Subject: [Tutor] FrozenDict
>
> Hi,
> I wanted to create a read-only dict to hold some constants. I looked around
> on the internet and created two implementations:-
Hi,
I wanted to create a read-only dict to hold some constants. I looked around on
the internet and created two implementations:-FrozenDict (derives from
collections.mapping)-ChillyDict (derives from dict, which seems more obvious to
me)
The code can be found here: http://pastebin.com/QJ3V2mSK
S
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