Changes by Piotr Dobrogost p...@bugs.python.dobrogost.net:
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nosy: +piotr.dobrogost
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Python tracker rep...@bugs.python.org
http://bugs.python.org/issue11011
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R. David Murray added the comment:
By my reading compose was also rejected, so I'm going to close this. (See
issue 1506122 for one previous rejection of compose.)
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nosy: +r.david.murray
resolution: - rejected
stage: - committed/rejected
status: open - closed
type: - enhancement
Mark Lawrence added the comment:
To summarize flip, const and identity won't happen, trampoline needs an
external recipe or blog post and compose is the only one that's likely to
happen. Opinions please gentlemen.
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nosy: +BreamoreBoy
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Python
Nick Coghlan ncogh...@gmail.com added the comment:
How the conversion from a recursive algorithm to an iterative one works depends
on the specific algorithm involved. A trampoline does the job for tail calls,
but not necessarily any other recursive algorithm.
Factorial actually has a fairly
Raymond Hettinger rhettin...@users.sourceforge.net added the comment:
I'm intrigued by the tampoline() but after reading Nick's post, I think it
needs to be an external recipe or blog post with extensive examples so that it
can mature and either prove its worth or serve as an intellectually
New submission from Jason Baker amnorv...@gmail.com:
I've created a patch that adds some common functional programming tools to
functools. I've made the patch to work against Python 3.2, but that may be a
bit aggressive. If so, then I can adapt it to work with 3.3.
I also wouldn't be
Raymond Hettinger rhettin...@users.sourceforge.net added the comment:
Some of these have been proposed and rejected before.
Compose has a problematic API because the traditional order of application in
mathematics is counter-intuitive for many people.
Const seems reasonable except that we
Raymond Hettinger rhettin...@users.sourceforge.net added the comment:
One other thought: The use of list comprehensions (a.k.a. list displays) and
generator expressions has made many functional tools less necessary than ever.
# preferred over map(pow, repeat(2), range(5))
[pow(2, x) for
Jason Baker amnorv...@gmail.com added the comment:
Ray, thanks for prompt and thorough feedback. To address your concerns:
* I'm fine with doing away with const and identity (long story short I haven't
really used them in functional languages anyway). There were reasons for
defining
Nick Coghlan ncogh...@gmail.com added the comment:
For flip, const and identity I agree there are already better ways to handle
them using either itertools or comprehension syntax.
The problem I have with trampoline is that it depends on the function's *return
values* being defined in a
Jason Baker amnorv...@gmail.com added the comment:
I'm not sure I understand how Raymond's alternative for trampoline works.
Let's take the factorial algorithm from wikipedia's page on tail recursion[1].
I've implemented the tail recursive version of the algorithm in Python using
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