On 4/11/02 3:14 PM, "Geoffrey Talvola" <[EMAIL PROTECTED]> wrote:
> Jeffrey Shell wrote:
>> Be wary of these attributes - they can grow like wildfire.
>> Almost every
>> large Python application I've worked on where people started using
>> class-like attributes in this manner has grown into a qui
On Thu, 2002-04-11 at 15:14, Jeffrey P Shell wrote:
> The Interfaces package that Zope uses uses the __implements__ attribute. A
> benefit is that it's a single common attribute that can be checked. Even if
> Webware doesn't sign on to using something like Interfaces, it might be
> worth to use
On Thu, 2002-04-11 at 12:37, Chuck Esterbrook wrote:
> I agree, but then it seems we should just put _isServlet=1 in
> Servlet.py and skip the issubclass() call:
>
> if not getattr(theClass, '_isServlet', 0):
> raise ...
issubclass handles the dual-import problem, while _is
Jeffrey Shell wrote:
> Be wary of these attributes - they can grow like wildfire.
> Almost every
> large Python application I've worked on where people started using
> class-like attributes in this manner has grown into a quite a mess,
> sometimes with two or three of these attributes that
> ul
On 4/11/02 11:37 AM, "Chuck Esterbrook" <[EMAIL PROTECTED]>
wrote:
>
> I agree, but then it seems we should just put _isServlet=1 in
> Servlet.py and skip the issubclass() call:
>
> if not getattr(theClass, '_isServlet', 0):
> raise ...
Be wary of these attributes - they can grow like wildfire
On Thursday 11 April 2002 08:01 am, Geoffrey Talvola wrote:
> I would propose a similar solution, but without methods. Use this as
> the test in ServletFactory in place of the current assertion:
>
> # A class is useable as a Servlet if it is derived from
> Servlet OR if it contains an _is
[EMAIL PROTECTED] wrote:
> On Thu, Apr 11, 2002 at 11:01:08AM -0400, Geoffrey Talvola wrote:
> > class MyFakeServlet:
> > _isServlet = 1
> > ...
> >
> > The Servlet class itself doesn't need to change at all.
> >
> > My rationale is that this is a fixed property of a
> particular class,
On Thu, Apr 11, 2002 at 11:01:08AM -0400, Geoffrey Talvola wrote:
> class MyFakeServlet:
> _isServlet = 1
> ...
>
> The Servlet class itself doesn't need to change at all.
>
> My rationale is that this is a fixed property of a particular class, so it
> should be a class attribute, ra
Geoff wrote:
>That's redundant. If this method is in Servlet itself, then simply:
>
> def isServletSubclass(self):
>return 1
Duh. Sorry!
Does ths same thing.
>My rationale is that this is a fixed property of a particular class, so it
>should be a class attribute, rather than a met
Edmund Lian wrote:
> Your question does suggest a potential solution though. How we add the
> following method in Servlet:
>
> def isServletSubclass(self):
> return issubclass(self, Servlet)
That's redundant. If this method is in Servlet itself, then simply:
def isServletSubcla
Chuck wrote:
>It's unfortunate that Python places so much emphasis on global
>functions:
> isinstance(obj, Class)
>
>Over methods:
> obj.isinstance(Class)
>
>Otherwise you could override this easily for your delegation case. Does
>isinstance() happen to call one those quadruple
On Wednesday 10 April 2002 04:00 pm, Edmund Lian wrote:
> I'm not advocating against inheritance. What I am advocating is that
> the type check needs to be able to be turned off, or made a bit more
> intelligent.
It's unfortunate that Python places so much emphasis on global
functions:
i
Geoff wrote:
>But someone (I can't even remember who started this thread :-)) is
>using a Delegation technique to write his servlets and could only
>get it to work by removing the check for Servlet as a base class.
That someone was me... :-)
Here's an example of delegation:
In the file that I
On Wednesday 10 April 2002 04:00 pm, Edmund Lian wrote:
> Chuck wrote:
> >It sounds like the assert should be changed to an "if: raise" to be
> >more clear and avoid being "optimized out".
>
> Maybe so, but regardless of how the type checking is done, I think we
> ought to be able to use delegatio
Chuck wrote:
>It sounds like the assert should be changed to an "if: raise" to be
>more clear and avoid being "optimized out".
Maybe so, but regardless of how the type checking is done, I think we ought
to be able to use delegation. With autodelegation, all the additional
methods that might be
Esterbrook [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, April 10, 2002 6:26 PM
> To: Geoffrey Talvola; [EMAIL PROTECTED]
> Subject: Re: [Webware-discuss] Allowing delegation in servlets
>
>
> On Wednesday 10 April 2002 01:53 pm, Geoffrey Talvola wrote:
> > I would propo
xperienced earlier.
It sounds like the assert should be changed to an "if: raise" to be
more clear and avoid being "optimized out".
-Chuck
>
> > -Original Message-
> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
> > Sent: Monday, April
Geoff wrote:
>I would propose using "hasattr" to check for the existence of awake,
>respond, and sleep, and removing the assert statement. The RuntimeError
>that results could have a much better error message than the assert would
>give us, anyhow.
I think this is a tidier solution that also r
removing the assert statement. I somehow
have a feeling that he has an opinion on this, maybe because it was
discussed before?
- Geoff
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
> Sent: Monday, April 08, 2002 3:31 PM
> To: [EMAIL PROTECTED]
> Subj
> "geoffrey" == Geoffrey Talvola <[EMAIL PROTECTED]> writes:
geoffrey> Let's not make this a one-off. Instead, pydoc or other
geoffrey> documentation tools should be run on the Python source
geoffrey> automatically as part of running "python install.py" (or
geoffrey> "python setup.py
Kendall Clark wrote:
> jeffrey> 1. Documentation - it would help to see what core set(s) of
> jeffrey> methods make up servlet use, and which methods are
> jeffrey> particular to special servlet implementations.
>
> and toward this same end --
>
> I think it would help if someone c
> "jeffrey" == Jeffrey P Shell writes:
jeffrey> Anyways, I've found myself wishing that their Interface
jeffrey> package was available separately, as it could help Webware
jeffrey> a couple of ways:
Failing that...
jeffrey> 1. Documentation - it would help to see what core set(s) o
On Mon, Apr 08, 2002 at 02:43:37PM -0400, Geoffrey Talvola wrote:
> > My first attempt failed because line 183 of ServletFactory is:
> >
> > assert issubclass(theClass, Servlet)
> >
> > Anyway, I'd like to argue for the removal of the assertion in
> > ServletFactory, since it is denying use
On 4/8/02 2:10 AM, "Edmund Lian" <[EMAIL PROTECTED]> wrote:
> I've been trying to work around a multiple inheritance issue (the diamond
> problem that Python 2.2 solves) with Cheetah, and thought of using
> delegation instead of inheritance.
>
> My first attempt failed because line 183 of Servle
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