On Monday 04 Jul 2005 03:10, Phillip J. Eby wrote:
> At 03:41 PM 7/3/2005 -0400, Raymond Hettinger wrote:
> >[Michael Hudson]
> > > This is possible. I just wanted to expand everyone's minds :)
> > The mechanism is more general than resourcemanagement.
> Expand your mind. :) "Resource" can include whatever objects you want it
> to -- or no objects at all.
Is printing HTML and guaranteeing ending tags a resource ? I've been reading
this thread, and been thinking that Holger Kregel's XPython hack could be
implemented using the new with statement.
with some_encoding:
with html:
with body:
with h1:
print "Some heading"
with p:
print "This is paragraph 1"
with p:
print "This is paragraph 2"
with h2:
print "Another heading"
The enter/exit for html would be to print <html> </html> respectively and so
on. (Though "p" would be special cased, etc)
Personally it seems to me that "with" is more a form of *guarantee* -
something that has a guard to enter the block, and something that
does something after the block.
>From that perspective you could even imagine:
with enforce_conditions(pre,post):
do some work.
...
...
enforce_conditions
- enforces the "pre" before entering the block, and may choose to throw an
exception if the precondition is false.
- checks that "post" holds after the block, and may throw an exception if
the postcondition is false.
Again, I don't really see that as a resource type scenario. It *may* involve
a resource scenario, but it may not. (eg did a condition finish within a
certain time?)
Perhaps calling it a guarantor? (or similar)
* You can guarantee that you have the lock on a resource if you enter the
block ?
* You can guarantee that you will have properly form (X|HT)ML if using an
appropriate approach ?
* You can guarantee checking of post conditions in a uniform manner ?
(Assumption: That the word guarantee in this case matches that of the intent)
If you just call the with statement a "resource manager" I suspect that people
will more /naturally/ think just along the idea of resources, rather than
also along the lines of things that need guarantees.
Is that really a resource type scenario?
Best Regards,
Michael.
--
Michael Sparks, Senior R&D Engineer, Digital Media Group
[EMAIL PROTECTED], http://kamaelia.sourceforge.net/
British Broadcasting Corporation, Research and Development
Kingswood Warren, Surrey KT20 6NP
This e-mail may contain personal views which are not the views of the BBC.
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