On Thu, Jun 4, 2009 at 7:42 PM, Scott David
Daniels wrote:
> Brian Quinlan wrote:
>>
>> This is from Python built from the py3k branch:
>> >>> c = (lambda : i for i in range(11, 16))
>> >>> for q in c:
>> ... print(q())
>> ...
>> 11
>> 12
>> 13
>> 14
>> 15
>> >>> # This is expected
>> >>> c
In article ,
Terry Reedy wrote:
>
>(1) Calling the first and rest methods 'car' and 'cdr' convinces me that
>schemers really do not want scheme to be popular, but prefer it to
>remain a small cult language.
What, you don't get a warm, fuzzy feeling from saying, "Today is the car
of the cdr of
Michele Simionato wrote:
Yes, most functional languages have the concept of streams.
You can even define a stream-comprehension that looks like
Python generator comprehension but it is an essentially different
thing. See for instance
http://www.artima.com/weblogs/viewpost.jsp?thread=251159
I
On Jun 6, 12:06 am, Terry Reedy wrote:
> Brian Quinlan wrote:
>
> > Sorry, I wasn't as precise as I should have been.
>
> > If you consider this example:
> > ( for x in y)
>
> > I thought that every time that was evaluated, it would be done in
> > a new closure with x bound to the value of x at t
Brian Quinlan wrote:
Sorry, I wasn't as precise as I should have been.
If you consider this example:
( for x in y)
I thought that every time that was evaluated, it would be done in
a new closure with x bound to the value of x at the time that the
closure was created.
Instead, a new closur
Ned Deily wrote:
In article <[email protected]>,
Brian Quinlan wrote:
Scott David Daniels wrote:
[snipped]
When you evaluate a lambda expression, the default args are evaluated,
but the expression inside the lambda body is not. When you apply that
evaluated lambda expression, the
In article ,
Lawrence D'Oliveiro wrote:
>In message
><78180b4c-68b2-4a0c-8594-50fb1ea2f...@c19g2000yqc.googlegroups.com>, Michele
>Simionato wrote:
>>
>> The crux is in the behavior of the for loop: in Python there is a
>> single scope and the loop variable is *mutated* at each iteration,
>> wh
On Jun 5, 11:26 am, "Gabriel Genellina"
wrote:
> Mmm, the URL ends with: thread, an equals sign, and the number 251156
> If you see =3D -- that's the "=" encoded as quoted-printable...
Actually this is the right URL:
http://www.artima.com/weblogs/viewpost.jsp?thread=251156
--
http://mail.pytho
En Fri, 05 Jun 2009 01:49:15 -0300, Aahz escribió:
In article
<05937a34-5490-4b31-9f07-a319b44dd...@r33g2000yqn.googlegroups.com>,
Michele Simionato wrote:
Actually, in Scheme one would have to fight to define
a list comprehension (more in general loops) working as
in Python: the natural d
In message
<78180b4c-68b2-4a0c-8594-50fb1ea2f...@c19g2000yqc.googlegroups.com>, Michele
Simionato wrote:
> The crux is in the behavior of the for loop:
> in Python there is a single scope and the loop variable is
> *mutated* at each iteration, whereas in Scheme (or Haskell or any
> other functio
On Jun 5, 6:49 am, [email protected] (Aahz) wrote:
> In article
> <05937a34-5490-4b31-9f07-a319b44dd...@r33g2000yqn.googlegroups.com>,
> Michele Simionato wrote:
>
>
>
> >Actually, in Scheme one would have to fight to define
> >a list comprehension (more in general loops) working as
> >in Pyt
On Jun 5, 6:49 am, [email protected] (Aahz) wrote:
> In article
> <05937a34-5490-4b31-9f07-a319b44dd...@r33g2000yqn.googlegroups.com>,
> Michele Simionato wrote:
>
>
>
> >Actually, in Scheme one would have to fight to define
> >a list comprehension (more in general loops) working as
> >in Pyt
In message , Brian
Quinlan wrote:
>>>> c = (lambda : i for i in range(11, 16))
>>>> d = list(c)
>>>> for q in d:
>...print(q())
>...
>15
>15
>15
>15
>15
Try
>>> c = ((lambda i : lambda : i)(i) for i in range(11, 16))
>>> d = list(c)
>>
In article <[email protected]>,
Brian Quinlan wrote:
> Scott David Daniels wrote:
> [snipped]
> > When you evaluate a lambda expression, the default args are evaluated,
> > but the expression inside the lambda body is not. When you apply that
> > evaluated lambda expression, the expr
In article <05937a34-5490-4b31-9f07-a319b44dd...@r33g2000yqn.googlegroups.com>,
Michele Simionato wrote:
>
>Actually, in Scheme one would have to fight to define
>a list comprehension (more in general loops) working as
>in Python: the natural definition works as the OP wants. See
>http://www.arti
Carl Banks wrote:
The way to handle the issue you are seeing is to create a new scope
with a variable the remains at the value you want to close upon:
create_const_function(value):
def func():
return value
c =create_const_function(i) for i in range(11, 16))
Or you can do it the sl
Scott David Daniels wrote:
[snipped]
When you evaluate a lambda expression, the default args are evaluated,
but the expression inside the lambda body is not. When you apply that
evaluated lambda expression, the expression inside the lambda body is
is evaluated and returned.
But that's not real
On Jun 5, 1:18 am, Carl Banks wrote:
> It's really the only sane way to handle it, odd though it may seem in
> this narrow case. In Python nested functions have to be able to
> reference the current value of a variable because of use cases like
> this:
>
> def func():
> def printx():
>
Gabriel Genellina wrote:
En Thu, 04 Jun 2009 18:40:07 -0300, Brian Quinlan
escribió:
This is from Python built from the py3k branch:
It's not new; same thing happens with 2.x
A closure captures (part of) the enclosing namespace, so names are
resolved in that environment even after the enc
Brian Quinlan wrote:
This is from Python built from the py3k branch:
>>> c = (lambda : i for i in range(11, 16))
>>> for q in c:
... print(q())
...
11
12
13
14
15
>>> # This is expected
>>> c = (lambda : i for i in range(11, 16))
>>> d = list(c)
>>> for q in d:
... print(q())
...
15
On Jun 4, 2:40 pm, Brian Quinlan wrote:
> This is from Python built from the py3k branch:
> >>> c = (lambda : i for i in range(11, 16))
> >>> for q in c:
> ... print(q())
> ...
> 11
> 12
> 13
> 14
> 15
> >>> # This is expected
> >>> c = (lambda : i for i in range(11, 16))
> >>> d = list(c
En Thu, 04 Jun 2009 18:40:07 -0300, Brian Quinlan
escribió:
This is from Python built from the py3k branch:
It's not new; same thing happens with 2.x
A closure captures (part of) the enclosing namespace, so names are
resolved in that environment even after the enclosing block has finishe
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