Roy Smith於 2013年4月25日星期四UTC+8上午7時50分33秒寫道：
> I discovered something really neat today.
>
>
>
> We've got a system with a bunch of rules. Each rule is a method which
>
> returns True or False. At some point, we need to know if all the rules
>
> are True. Complicating things, not all the ru
In article <51792710$0$29977$c3e8da3$54964...@news.astraweb.com>,
Steven D'Aprano wrote:
> > It also says, "Its truth value is true". Why would they document that
> > fact if you weren't supposed to use it as a boolean operand?
>
> You can use *anything* in Python in a boolean context. That's
On Thu, 25 Apr 2013 08:36:34 -0400, Roy Smith wrote:
> In article <5178b1db$0$29977$c3e8da3$54964...@news.astraweb.com>,
> Steven D'Aprano wrote:
>
>> The semantics of NotImplemented is that it is a signal for one object
>> to say "I don't know how to do this, let somebody else try".
>
> That'
In article <5178b1db$0$29977$c3e8da3$54964...@news.astraweb.com>,
Steven D'Aprano wrote:
> The semantics of NotImplemented is that it is a signal for one object to
> say "I don't know how to do this, let somebody else try".
That's precisely the logic here. The rule says, "I don't know how to
On Wed, 24 Apr 2013 19:25:37 -0700, Ethan Furman wrote:
> On 04/24/2013 06:35 PM, Steven D'Aprano wrote:
>> Objects are supposed to return NotImplemented from special dunder
>> methods like __add__, __lt__, etc. to say "I don't know how to
>> implement this method for the given argument". Python w
On 04/24/2013 07:20 PM, Chris Angelico wrote:
On Thu, Apr 25, 2013 at 11:41 AM, Roy Smith wrote:
In article <5178884b$0$29977$c3e8da3$54964...@news.astraweb.com>,
Steven D'Aprano wrote:
I don't see why you would need anything like that. Reading further on, I
see that you are counting unimp
On 04/24/2013 06:35 PM, Steven D'Aprano wrote:
Objects are supposed to return NotImplemented from special dunder methods
like __add__, __lt__, etc. to say "I don't know how to implement this
method for the given argument". Python will then try calling the other
object's special method. If both ob
In article ,
Chris Angelico wrote:
> On Thu, Apr 25, 2013 at 11:41 AM, Roy Smith wrote:
> > In article <5178884b$0$29977$c3e8da3$54964...@news.astraweb.com>,
> > Steven D'Aprano wrote:
> >
> >> I don't see why you would need anything like that. Reading further on, I
> >> see that you are coun
On Thu, Apr 25, 2013 at 11:41 AM, Roy Smith wrote:
> In article <5178884b$0$29977$c3e8da3$54964...@news.astraweb.com>,
> Steven D'Aprano wrote:
>
>> I don't see why you would need anything like that. Reading further on, I
>> see that you are counting unimplemented rules as true, for some reason
In article <5178884b$0$29977$c3e8da3$54964...@news.astraweb.com>,
Steven D'Aprano wrote:
> I don't see why you would need anything like that. Reading further on, I
> see that you are counting unimplemented rules as true, for some reason
> which I don't understand.
The top-level logic we need
On Wed, 24 Apr 2013 19:50:33 -0400, Roy Smith wrote:
> I discovered something really neat today.
>
> We've got a system with a bunch of rules. Each rule is a method which
> returns True or False. At some point, we need to know if all the rules
> are True. Complicating things, not all the rules
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