date:20110411

On Tue, Apr 12, 2011 at 3:26 AM, Ian Kelly ian.g.ke...@gmail.com wrote:
 So what is that number?  Anecdotes are unreliable; I would like to see
 the actual data.  The only non-techie I personally know who uses Linux
 is my wife, and she only uses it because it's what's installed at
 home.  My brother-in-law was a Linux fan at one time but has
 regressed.

The company where I work used to be a Windows shop exclusively, but
now we're migrating more and more to Linux. All my devo is now Linux,
and my boss is encouraging my coworkers to do the same. That's still
anecdotal data though.

We use Linux for technological reasons more than anything else.
Windows doesn't give us the power of iptables, for instance.

Chris Angelico
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Re: Dump interpreter history?

2011-04-11 Thread Terry Reedy


On 4/11/2011 11:54 AM, Aahz wrote:

In articlemailman.1266.1301087057.1189.python-l...@python.org,
Ken D'Ambrosiok...@jots.org  wrote:


Hey, all.  A co-worker asked me a question, and I've got no idea how (or
if) it can be done.  Bottom line: he'd like to save off the text from an
interpreter session, his thinking being that you've already tried to get
what you want, and now you just need to gussy it up in an editor.


I've never used it myself, but IIRC ipython does what you want very
nicely.


Idle will save the contents of the shell window, including opening slash 
line and prompts.


--
Terry Jan Reedy

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Re: Do UART require data structure/format for serial communication?

2011-04-11 Thread John Nagle


On 4/11/2011 4:57 AM, Jean-Michel Pichavant wrote:

VGNU Linux wrote:

Hi All,
I have two chips one understands Python and the other embedded C.I
have connected both chips using UART serial communication channel,
however I have no idea how data communication must be achieved between
this 2 chips. As for example send using C chip string Hello Python
which python chip easily understands and replies back a string Hi C.
I am pretty new to embedded systems can anybody help me understand
data communication using UART.
Thank in advance.


What do you want to do?

There are many serial protocols.  At the low end, you can
send text. At the high end, you can send TCP over PPP.
The Arduno crowd has some protocols of their own.  See
http://www.arduino.cc/en/Reference/Libraries;.

Any useful protocol must be able to deal with errors
on the link, either end restarting, and the other end failing
to respond.  All those things happen frequently with serial
ports.

What do you want to do?

John Nagle
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Re: [OT] Free software versus software idea patents

2011-04-11 Thread geremy condra

On Mon, Apr 11, 2011 at 2:10 AM, Steven D'Aprano
steve+comp.lang.pyt...@pearwood.info wrote:
 On Mon, 11 Apr 2011 00:53:57 -0700, geremy condra wrote:

snip

 I am extremely skeptical of this argument. Leaving aside the fact that
 you've randomly decided to drop the decidable qualifier here- a big
 problem in its own right- it isn't clear to me that software and
 computation are synonymous. Lambda calculus only models computation, and
 software has real properties in implementation that are strictly
 dependent on the physical world. Since perfectly predicting those
 properties would seem to require that you perfectly model significant
 portions of the physical universe, I think it's quite reasonable to
 contend that the existence of lambda calculus no more rules out the
 applicability of patents to software (which I detest) than it rules out
 the applicability of patents to hardware (which I find only slightly
 less ridiculous) or other meatspace inventions.

 I agree with all of this: I too detest software patents, and find
 hardware patents problematic but pragmatic. But if there's a reason for
 accepting one and rejecting the other, it's far more subtle than the hand-
 waving about mathematics. I believe that the reason falls more to
 *pragmatic* reasons than *philosophical* reasons: software patents act to
 discourage innovation, while hardware patents (arguably) act to encourage
 it. After all, encouraging innovation is what patents are for.

 M Harris' argument fails right at the beginning:

 Mathematical processes and algorithms are not patentable (by rule)
 because they are 'natural' and 'obvious'.

 It's not clear to me how the Banach-Tarski paradox can be described as
 'natural':

    Using the axiom of choice on non-countable sets, you can prove
    that a solid sphere can be dissected into a finite number of
    pieces that can be reassembled to two solid spheres, each of
    same volume of the original. No more than nine pieces are needed.
    ... This is usually illustrated by observing that a pea can be
    cut up into finitely pieces and reassembled into the Earth.

    http://www.cs.uwaterloo.ca/~alopez-o/math-faq/mathtext/node36.html


 And I think anyone who knows the slightest bit of mathematics would be
 falling over laughing at the suggestion that it is 'obvious'.

I'd quibble with you over terminology here. BTP arises naturally- ie,
without being explicitly constructed- in certain axiomatic systems.
But I get your point.

 Of course, some mathematics is obvious, or at least intuitive (although
 proving it rigorously can be remarkably difficult -- after 4000 years of
 maths, we still don't have an absolutely bullet-proof proof that 1+1=2).

Erm. This is getting a bit far afield, but yes, we do. The statement
you provide above part of Presbuger arithmetic, which is both complete
and decidable.

 But describing mathematics as 'obvious' discounts the role of invention,
 human imagination, ingenuity and creativity in mathematics. There's
 nothing obvious about (say) asymmetric encryption, or solving NP-complete
 problems like the knapsack problem, to mention just two examples out of
 literally countless examples.[1]

Meh. Obvious is in the eye of the beholder, and I doubt we'll wind up
coming up with a satisfying and rigorous definition here. I'd
therefore rest on the concept of 'natural' I outlined earlier, which
would clearly forbid patenting the product of discovery but allow
patenting inventions.

 If it were just a matter of joining the dots, there would be no unsolved
 problems, since Euler would have solved them all 200 years ago.[2]

 Part of the patent problem is that the distinction between discovery of a
 fact (which should not be patentable) and invention (which, at least
 sometimes, should be patentable) is not clear. The iPod existed as a
 Platonic ideal in some mathematical bazillion-dimensional abstract design
 space long before it was invented by Apple; does that make it a discovery
 rather than an invention? On the other hand, it is doing Apple a great
 disservice to ignore their creativity in finding that design point, out
 of the infinite number of almost-iPods that suck[3] or don't work.

I agree. Of course, your post existed as a billion-point platonic
ideal beforehand, so you can't really claim credit (man, Plato figured
*everything* out!), but still.

Geremy Condra
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Re: Multiprocessing, shared memory vs. pickled copies

2011-04-11 Thread sturlamolden

On 11 apr, 09:21, John Nagle na...@animats.com wrote:

      Because nobody can fix the Global Interpreter Lock problem in CPython.

      The multiprocessing module is a hack to get around the fact
 that Python threads don't run concurrently, and thus, threaded
 programs don't effectively use multi-core CPUs.

Then why not let NumPy use shared memory in this case? It is as simple
as this:

import numpy as np
import sharedmem as sm
private_array = np.zeros((10,10))
shared_array  = sm.zeros((10,10))

I.e. the code is identical (more or less).

Also, do you think shared memory has other uses besides parallel
computing, such as IPC? It is e.g. an easy way to share data between
Python and an external program. Do you e.g. need to share (not send)
large amounts of data between Python and Java or Matlab?

The difference here from multiprocessing.Array is that IPC with
multiprocessing.Queue will actually work, because I am not using
anonymous shared memory. Instead of inherting handles, the segment has
a name in the file system, which means it can be memory mapped from
anywhere.

I posted the code to the NumPy mailing list yesterday.

Sturla
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Re: Multiprocessing, shared memory vs. pickled copies

2011-04-11 Thread sturlamolden

On 11 apr, 21:11, sturlamolden sturlamol...@yahoo.no wrote:

 import numpy as np
 import sharedmem as sm
 private_array = np.zeros((10,10))
 shared_array  = sm.zeros((10,10))

I am also using this to implement synchronization primitives (barrier,
lock, semaphore, event) that can be sent over an instance of
multiprocessing.Queue. The synchronization primitives in
multiprocessing cannot be communicated this way.

Sturla
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[Feature Request] dict.setdefault()

2011-04-11 Thread rantingrick


setdefault should take **kw args in the case of needing to set
multiple defaults at one time. I would even settle for an *arg list if
i had to. Anything is better than...

d.setdefault(blah, blah)
d.setdefault(blah, blah)
d.setdefault(blah, blah)
d.setdefault(blah, blah)
if blah is not blah:
d.setdefault(blah, blah)

...nuff said.

PS: And to counter the very *extemely* likely chance of some smart
arse responses
  * YES, i know i could create my own setdefault method but that is
not the point.
  * I know we are under the moratorium but someone had to mention it,

--rr
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Re: [Feature Request] dict.setdefault()

2011-04-11 Thread Westley Martínez

On Mon, 2011-04-11 at 14:35 -0700, rantingrick wrote:
 setdefault should take **kw args in the case of needing to set
 multiple defaults at one time. I would even settle for an *arg list if
 i had to. Anything is better than...
 
 d.setdefault(blah, blah)
 d.setdefault(blah, blah)
 d.setdefault(blah, blah)
 d.setdefault(blah, blah)
 if blah is not blah:
 d.setdefault(blah, blah)
 
 ...nuff said.
 
 PS: And to counter the very *extemely* likely chance of some smart
 arse responses
   * YES, i know i could create my own setdefault method but that is
 not the point.
   * I know we are under the moratorium but someone had to mention it,
 
 --rr

Go to bugs.python.org

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Re: Dump interpreter history?

2011-04-11 Thread John Gordon

In mailman.1278.1301104317.1189.python-l...@python.org Tim Chase 
python.l...@tim.thechases.com writes:

  import readline
  readline.write_history_file([filename])

 Just to clarify (I thought Daniel's answer was so easy it must 
 have misinterpreted the OP's request), that's a single string as 
 a filename, not a list containing a filename.  I tried

In most documentation, square brackets indicate that the enclosed item is
optional; the brackets are not meant to be used literally.

Therefore, this text:

  readline.write_history_file([filename])

says You can call write_history_file() with no arguments at all, or
with one argument which is the name of the file to be written.

-- 
John Gordon   A is for Amy, who fell down the stairs
gor...@panix.com  B is for Basil, assaulted by bears
-- Edward Gorey, The Gashlycrumb Tinies

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Re: [OT] Free software versus software idea patents

2011-04-11 Thread Steven D'Aprano

On Mon, 11 Apr 2011 11:17:09 -0700, geremy condra wrote:

 On Mon, Apr 11, 2011 at 2:10 AM, Steven D'Aprano
 steve+comp.lang.pyt...@pearwood.info wrote:
[...]
 Of course, some mathematics is obvious, or at least intuitive (although
 proving it rigorously can be remarkably difficult -- after 4000 years
 of maths, we still don't have an absolutely bullet-proof proof that
 1+1=2).
 
 Erm. This is getting a bit far afield, but yes, we do. The statement you
 provide above part of Presbuger arithmetic, which is both complete and
 decidable.

Ah, I didn't know that! How wonderful! But in any case, Presburger 
arithmetic is much weaker than even Peano arithmetic.

http://en.wikipedia.org/wiki/Presburger_arithmetic

So, let me re-phrase my statement... in any realistically complex 
arithmetic that is consistent with operations performed for real-world 
applications (e.g. multiplication, division, exponentiation, ...), one 
cannot demonstrate a bullet-proof proof of 1+1=2. Better? :)

Presburger arithmetic, Peano arithmetic, the Axiom of Choice... we're 
getting further and further away from natural mathematics, e.g. 
counting sheep in a field.


[...]
 Part of the patent problem is that the distinction between discovery of
 a fact (which should not be patentable) and invention (which, at least
 sometimes, should be patentable) is not clear. The iPod existed as a
 Platonic ideal in some mathematical bazillion-dimensional abstract
 design space long before it was invented by Apple; does that make it a
 discovery rather than an invention? On the other hand, it is doing
 Apple a great disservice to ignore their creativity in finding that
 design point, out of the infinite number of almost-iPods that suck[3]
 or don't work.
 
 I agree. Of course, your post existed as a billion-point platonic ideal
 beforehand, so you can't really claim credit (man, Plato figured
 *everything* out!), but still.

Damn Library of Babel, it has *everything* in it.


Anyway, this is now getting off-topic even for the original off-topic 
post. Time to move on, methinks.


-- 
Steven
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Re: [Feature Request] dict.setdefault()

2011-04-11 Thread MRAB


On 11/04/2011 23:16, Westley Martínez wrote:

On Mon, 2011-04-11 at 14:35 -0700, rantingrick wrote:

setdefault should take **kw args in the case of needing to set
multiple defaults at one time. I would even settle for an *arg list if
i had to. Anything is better than...

d.setdefault(blah, blah)
d.setdefault(blah, blah)
d.setdefault(blah, blah)
d.setdefault(blah, blah)
if blah is not blah:
 d.setdefault(blah, blah)

...nuff said.

PS: And to counter the very *extemely* likely chance of some smart
arse responses
   * YES, i know i could create my own setdefault method but that is
not the point.
   * I know we are under the moratorium but someone had to mention it,

--rr


Go to bugs.python.org


I'm not sure that setdefault should take **kw args for this because
of its existing argument structure (key + optional value).

A new method like updatedefault may be better, IMHO. It would act
like update except that it wouldn't overwrite existing values.
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Re: [Feature Request] dict.setdefault()

On Tue, Apr 12, 2011 at 8:41 AM, MRAB pyt...@mrabarnett.plus.com wrote:
 I'm not sure that setdefault should take **kw args for this because
 of its existing argument structure (key + optional value).

 A new method like updatedefault may be better, IMHO. It would act
 like update except that it wouldn't overwrite existing values.

Wouldn't x.updatedefault(y) be pretty much y.update(x) ?

Chris Angelico
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Re: Argument of the bool function

2011-04-11 Thread Ethan Furman


Mel wrote:

Python is a pragmatic language, so all the rules come pre-broken.


+1 QOTW
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Re: dict.setdefault()

2011-04-11 Thread Raymond Hettinger

On Apr 11, 2:35 pm, rantingrick rantingr...@gmail.com wrote:
 setdefault should take **kw args in the case of needing to set
 multiple defaults at one time. I would even settle for an *arg list if
 i had to. Anything is better than...

 d.setdefault(blah, blah)
 d.setdefault(blah, blah)
 d.setdefault(blah, blah)
 d.setdefault(blah, blah)
 if blah is not blah:
     d.setdefault(blah, blah)

I hate to feed a troll, but I'm curious when you see that pattern of
calls.  The typical use case always makes immediate use of the value
returned by setdefault():

   d.setdefault(key, []).append()

The pattern you've shown would more typically be expressed like this:

   for key in multiple_defaults.items():
   if key, default_value not in d:
   d[key] = default_value

Or people sometimes use updates to get the same effect:

   result = multiple_defaults.copy()
   result.update(d)

Another approach is to use something like ChainMap() which has been
added to Python 3.3. 
http://docs.python.org/dev/library/collections.html#collections.ChainMap

   result = ChainMap(d, multiple_defaults)


Raymond
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Re: [Feature Request] dict.setdefault()

2011-04-11 Thread Chris Rebert

On Mon, Apr 11, 2011 at 2:35 PM, rantingrick rantingr...@gmail.com wrote:

 setdefault should take **kw args in the case of needing to set
 multiple defaults at one time. I would even settle for an *arg list if
 i had to.

What would the return value be? dict.setdefault() doesn't currently
just return None you know.

 Anything is better than...

 d.setdefault(blah, blah)
 d.setdefault(blah, blah)
 d.setdefault(blah, blah)
 d.setdefault(blah, blah)
 if blah is not blah:
    d.setdefault(blah, blah)

The redundancy is easily removed:
defaults = {blah: blah, blah: blah, blah: blah, blah: blah}
defaults.update(d) # clobber defaults with specified vals
d = defaults # swap in, assuming not aliased
# if aliased, then instead:
# d.clear()
# d.update(defaults)
if blah is not blah:
d.setdefault(blah, blah)

Cheers,
Chris
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Re: [OT] Free software versus software idea patents

2011-04-11 Thread geremy condra

On Mon, Apr 11, 2011 at 3:28 PM, Steven D'Aprano
steve+comp.lang.pyt...@pearwood.info wrote:
 On Mon, 11 Apr 2011 11:17:09 -0700, geremy condra wrote:

 On Mon, Apr 11, 2011 at 2:10 AM, Steven D'Aprano
 steve+comp.lang.pyt...@pearwood.info wrote:
 [...]
 Of course, some mathematics is obvious, or at least intuitive (although
 proving it rigorously can be remarkably difficult -- after 4000 years
 of maths, we still don't have an absolutely bullet-proof proof that
 1+1=2).

 Erm. This is getting a bit far afield, but yes, we do. The statement you
 provide above part of Presbuger arithmetic, which is both complete and
 decidable.

 Ah, I didn't know that! How wonderful! But in any case, Presburger
 arithmetic is much weaker than even Peano arithmetic.

 http://en.wikipedia.org/wiki/Presburger_arithmetic

 So, let me re-phrase my statement... in any realistically complex
 arithmetic that is consistent with operations performed for real-world
 applications (e.g. multiplication, division, exponentiation, ...), one
 cannot demonstrate a bullet-proof proof of 1+1=2. Better? :)

Well, Peano arithmetic is normal, everyday arithmetic fully
axiomatized, and Presburger arithmetic is a subset of it, so we can
utilize the fact that 1 + 1 = 2 is provable in Presburger arithmetic
(damn is my spell checker getting a workout on this sentence) to prove
it in Peano arithmetic, and therefore in everyday use.

You'd also be surprised what you can do with some limited arithmetic
forms. During my undergrad I spent some time writing a Presburger
prover that was actually fairly handy- there are definitely instances
where trading multiplication by non-constant factors for provability
superpowers is a good deal.

 Presburger arithmetic, Peano arithmetic, the Axiom of Choice... we're
 getting further and further away from natural mathematics, e.g.
 counting sheep in a field.

Yes, the sheep would much rather hear about patent reform than the
axiom of choice ;)

snip

 Anyway, this is now getting off-topic even for the original off-topic
 post. Time to move on, methinks.

Yeah, looks like a good time to let this one trail off.

Geremy Condra
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Re: [Feature Request] dict.setdefault()

2011-04-11 Thread MRAB


On 11/04/2011 23:44, Chris Angelico wrote:

On Tue, Apr 12, 2011 at 8:41 AM, MRABpyt...@mrabarnett.plus.com  wrote:

I'm not sure that setdefault should take **kw args for this because
of its existing argument structure (key + optional value).

A new method like updatedefault may be better, IMHO. It would act
like update except that it wouldn't overwrite existing values.


Wouldn't x.updatedefault(y) be pretty much y.update(x) ?


I suppose it would, except that it wouldn't be in-place as such, and it
wouldn't be as efficient if you're wanting to default only a few
entries in a larger dict.
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Feature suggestion -- return if true

2011-04-11 Thread zildjohn01

This is an idea I've had bouncing around in my head for a long time
now. I propose the following syntax:

return? expr

be expanded to

_temp = expr
if _temp: return _temp

It's a pattern I use all the time in my code, and although it's a bit
unorthodox, IMO it's concise, readable, and easily understandable.

Thoughts?
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Re: [OT] Free software versus software idea patents

2011-04-11 Thread Ben Finney

geremy condra debat...@gmail.com writes:

 […] I think it's quite reasonable to contend that the existence of
 lambda calculus no more rules out the applicability of patents to
 software (which I detest) than it rules out the applicability of
 patents to hardware (which I find only slightly less ridiculous) or
 other meatspace inventions.

That matches my own position on the topic.

Further, most software idea patents are worded so that they give lip
service to the theory that pure algorithms can't be patented; they tie
the patent to “A machine for computation plus [insert broad obfuscated
description of algorithm here]”. Yessir, this is an amazing invention of
ours to turn this general-purpose computer into a machine that does what
we want it to do. Patenting ideas? You must be thinking of someone else.

So, even if the theory of non-patentable algorithms were to stand up in
most jurisdictions, it doesn't have any force against the software idea
patents that are actually problematic.

-- 
 \   “Give a man a fish, and you'll feed him for a day; give him a |
  `\religion, and he'll starve to death while praying for a fish.” |
_o__)   —Anonymous |
Ben Finney
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Re: [Feature Request] dict.setdefault()

2011-04-11 Thread Tim Chase


On 04/11/2011 05:44 PM, Chris Angelico wrote:

On Tue, Apr 12, 2011 at 8:41 AM, MRABpyt...@mrabarnett.plus.com  wrote:

I'm not sure that setdefault should take **kw args for this because
of its existing argument structure (key + optional value).

A new method like updatedefault may be better, IMHO. It would act
like update except that it wouldn't overwrite existing values.


Wouldn't x.updatedefault(y) be pretty much y.update(x) ?


As I understand, the difference would be the following pseudocode:

 def update(self, d):
   for k,v in dict(d).iteritems():
 self[k] = v

 def updatedefault(self, d={}, **kwargs):
   for k,v in chain(
  dict(d).iteritems(),
  kwargs.iteritems()
  ):
 # MRAB's comment about wouldn't overwrite existing
 if k not in self:
   self[k] = v

My concern with the initial request is that dict.setdefault() 
already returns the (existent or defaulted) value, so you can do 
things like


  d.setdefault(my_key, []).append(item)

If you allow it to take multiple kwargs, what would the return 
value be (positionality of kwargs is lost, so returning a tuple 
wouldn't be readily possible)?


Finally, if it were added, I'd call it something like merge()

-tkc




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Announcing pyOpenSSL 0.12

2011-04-11 Thread exarkun


Exciting news everyone,

I have just released pyOpenSSL 0.12.  pyOpenSSL provides Python bindings 
to a number of OpenSSL APIs, including certificates, public and private 
keys, and of course running TLS (SSL) over sockets or arbitrary in- 
memory buffiers.


This release fixes an incompatibility with Python 2.7 involving 
memoryviews.  It also exposes the info callback constants used to 
report progress of the TLS handshake and later steps of SSL connections. 
Perhaps most interestingly, it also adds support for inspecting 
arbitrary X509 extensions.


http://python.org/pypi/pyOpenSSL - check it out.

Jean-Paul
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Re: dict.setdefault()

2011-04-11 Thread Raymond Hettinger

On Apr 11, 4:25 pm, Tim Chase python.l...@tim.thechases.com wrote:
 Finally, if it were added, I'd call it something like merge()

Guido rejected merge() a long time ago.

Anyway, there is a new ChainMap() tool in the collections module for
Py3.3 that should address a number of use cases for handling default
values.


Raymond

twitter: @raymondh
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Re: Feature suggestion -- return if true

On Tue, Apr 12, 2011 at 9:17 AM, zildjohn01 zildjoh...@gmail.com wrote:
 This is an idea I've had bouncing around in my head for a long time
 now. I propose the following syntax:

Maybe this is more appropriare for the python-ideas list ?

    return? expr

This syntax does not fit well within python ideology.

 be expanded to

    _temp = expr
    if _temp: return _temp

This could be simplified to just:

return expr or None

And more to the point... If your calee is relying
on the result of this function, just returning the
evaluation of expr is enough.

cheers
James

-- 
-- James Mills
--
-- Problems are solved by method
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Re: Feature suggestion -- return if true

On Tue, Apr 12, 2011 at 10:27 AM, James Mills
prolo...@shortcircuit.net.au wrote:
 This could be simplified to just:

 return expr or None

 And more to the point... If your calee is relying
 on the result of this function, just returning the
 evaluation of expr is enough.

I'm thinking here that that's not a solution; he'll have more code to
follow. An example of what I think he's trying to do:

def fac(n):
# attempt to get from a cache
return? cache[n]
# not in cache, calculate the value
ret=1 if n=1 else fac(n-1)*n
# and cache and return it
cache[n]=ret; return ret

If the rest of the function can be implemented as an expression, it
might be possible to use:

return expr or other_expr

But in the example of a lookup cache, that wouldn't work so easily -
assignment isn't an expression. If 'x=y' had a value as it does in C,
the above function could become:

def fac(n):
return cache[n] or (cache[n]=1 if n=1 else fac(n-1)*n)

which is a reasonable one-liner, albeit not the most efficient
factorial implementation. Is there a simple and Pythonic way to do
this?

BTW, assume for the purposes of discussion that the return? expr is a
complex one, such that it's well worth evaluating only once (maybe
even has side effects).

Chris Angelico
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Re: Feature suggestion -- return if true

On Tue, Apr 12, 2011 at 10:46 AM, Chris Angelico ros...@gmail.com wrote:
 def fac(n):
    return cache[n] or (cache[n]=1 if n=1 else fac(n-1)*n)

Hmm. The function-call version of dictionary assignment IS legal in an
expression, but it's getting stupid...

def fac(n):
return cache.get(n) or (cache.__setitem__(n,1 if n=1 else
fac(n-1)*n) or cache[n])

Chris Angelico
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Re: Feature suggestion -- return if true

2011-04-11 Thread Grant Edwards

On 2011-04-12, James Mills prolo...@shortcircuit.net.au wrote:
 On Tue, Apr 12, 2011 at 9:17 AM, zildjohn01 zildjoh...@gmail.com wrote:
 This is an idea I've had bouncing around in my head for a long time
 now. I propose the following syntax:

 Maybe this is more appropriare for the python-ideas list ?

 ?? ??return? expr

 This syntax does not fit well within python ideology.

 be expanded to

 ?? ??_temp = expr
 ?? ??if _temp: return _temp

 This could be simplified to just:

 return expr or None

How is that the same?

  return? something()  return something() or None
  return? somethingelse()  return somethingelse() or None
  log(didn't find an answer) log(didn't find an answer) 
  raise ValueError raise ValueError

Are you saying the two snippets above are equivalent?

-- 
Grant


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Re: Feature suggestion -- return if true

On Tue, Apr 12, 2011 at 11:44 AM, Grant Edwards invalid@invalid.invalid wrote:
 How is that the same?

  return? something()                  return something() or None
  return? somethingelse()              return somethingelse() or None
  log(didn't find an answer)         log(didn't find an answer)
  raise ValueError                     raise ValueError

 Are you saying the two snippets above are equivalent?

def foo(n):
x = n  5
if x:
return x

is functionally equivalent to:

def foo(n):
return n  5

-- 
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--
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Re: Feature suggestion -- return if true

2011-04-11 Thread Jason Swails

On Mon, Apr 11, 2011 at 7:12 PM, James Mills
prolo...@shortcircuit.net.auwrote:


  Are you saying the two snippets above are equivalent?

 def foo(n):
x = n  5
if x:
return x

 is functionally equivalent to:

 def foo(n):
return n  5


This is only true if n  5.  Otherwise, the first returns None and the
second returns False.

 def foo(n):
... x = n  5
... if x: return x
...
 def foo1(n):
... return n  5
...
 foo(4)
True
 foo1(4)
True
 foo(6)
 foo1(6)
False


--Jason
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Re: Feature suggestion -- return if true

2011-04-11 Thread Grant Edwards

On 2011-04-12, James Mills prolo...@shortcircuit.net.au wrote:
 On Tue, Apr 12, 2011 at 11:44 AM, Grant Edwards invalid@invalid.invalid 
 wrote:
 How is that the same?

 ??return? something() ?? ?? ?? ?? ?? ?? ?? ?? ??return something() or None
 ??return? somethingelse() ?? ?? ?? ?? ?? ?? ??return somethingelse() or None
 ??log(didn't find an answer) ?? ?? ?? ?? log(didn't find an answer)
 ??raise ValueError ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? raise ValueError

 Are you saying the two snippets above are equivalent?

 def foo(n):
 x = n  5
 if x:
 return x

 is functionally equivalent to:

 def foo(n):
 return n  5

That's not what I asked.

You stated that

  return? expr

was equivalent to

  return expr or None

If that was the case then the two code snippets _I_ posted should be
equivalent:

  return? something()   return something() or None
  return? somethingelse()   return somethingelse() or None
  log(didn't find an answer)  log(didn't find an answer)
  raise ValueError  raise ValueError

If the two snipped above are not equivalent, then

  return? expr

is isn't equivalent to

  return expr or None

-- 
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Re: Feature suggestion -- return if true

On Tue, Apr 12, 2011 at 12:18 PM, Jason Swails jason.swa...@gmail.com wrote:
 This is only true if n  5.  Otherwise, the first returns None and the
 second returns False.

Which is why I said:

return expr or None

But hey let's argue the point to death!

cheers
James

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Re: Feature suggestion -- return if true

2011-04-11 Thread Zero Piraeus

:

 This is only true if n  5.  Otherwise, the first returns None and the
 second returns False.

 Which is why I said:

 return expr or None

 But hey let's argue the point to death!

Ok ;-)

I think the point is that OP doesn't want to return *at all* if expr
is False - presumably because there are further statements after the
proposed 'conditional' return.

Anyway,

  return? expr

isn't very pythonic - so how about one of these?

  return expr if True
  return expr else continue

I kid, I kid ...

 -[]z.
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Re: Feature suggestion -- return if true

On Tue, Apr 12, 2011 at 12:20 PM, James Mills
prolo...@shortcircuit.net.au wrote:
 On Tue, Apr 12, 2011 at 12:18 PM, Jason Swails jason.swa...@gmail.com wrote:
 This is only true if n  5.  Otherwise, the first returns None and the
 second returns False.

 Which is why I said:

 return expr or None

 But hey let's argue the point to death!

That's still not equivalent. return expr or None will always
terminate the function. The OP's request was for something which would
terminate the function if and only if expr is non-false.

Chris Angelico
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Re: Feature suggestion -- return if true

On Tue, Apr 12, 2011 at 12:18 PM, Grant Edwards invalid@invalid.invalid wrote:
 You stated that

  return? expr

 was equivalent to

  return expr or None

This is _not_ what I said.

Quoting from my earlier post:


return? expr

This syntax does not fit well within python ideology.

 be expanded to

_temp = expr
if _temp: return _temp

This could be simplified to just:

return expr or None


Please read carefully before putting words in my mouth.

I stated very clear y that return? expr didn't seem fitting
in the python ideology as syntax for this behavior.

cheers
James

-- 
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--
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Re: Feature suggestion -- return if true

On Tue, Apr 12, 2011 at 12:43 PM, Zero Piraeus sche...@gmail.com wrote:
  return? expr

 isn't very pythonic - so how about one of these?

  return expr if True
  return expr else continue

 I kid, I kid ...

Or:

if expr:
  return it

Actually, I'm not sure how stupid an idea that is. Inside an if, 'it'
is the value of the condition. Might actually be useful in a few
places Naw, I think it's still a stupid idea.

Chris Angelico
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Re: Feature suggestion -- return if true

On Tue, Apr 12, 2011 at 12:43 PM, Zero Piraeus sche...@gmail.com wrote:
 I think the point is that OP doesn't want to return *at all* if expr
 is False - presumably because there are further statements after the
 proposed 'conditional' return.

If that's the case then we're all making assumptions
about what the OP intended. Perhaps OPs should be more
clear ? :)

kid!

cheers
James

-- 
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Re: dict.setdefault()

2011-04-11 Thread rantingrick

On Apr 11, 5:41 pm, MRAB pyt...@mrabarnett.plus.com wrote:

 A new method like updatedefault may be better, IMHO. It would act
 like update except that it wouldn't overwrite existing values.

That's sounds good MRAB! After you mentioned this i had an epiphany...
why not just add an extra argument to dict.update?

 dict.update(D, clobberexistingkeys=False)
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Re: Feature suggestion -- return if true

On Tue, Apr 12, 2011 at 12:44 PM, Chris Angelico ros...@gmail.com wrote:
 That's still not equivalent. return expr or None will always
 terminate the function. The OP's request was for something which would
 terminate the function if and only if expr is non-false.

The OP did not state this at all.
There was never any mention of early termination
of the function iif expr was True.

Sorry :/ I'm not picking on your comprehension skills here
but you didn't read what the OP wrote (which he/she may not have
been clear about in the first place( nor what I said in reply.

Have a nice day,

cheers
James

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Re: Literate Programming

2011-04-11 Thread Tim Arnold

Hans Georg Schaathun h...@schaathun.net wrote in message 
news:aca678-b87@svn.schaathun.net...
 On Fri, 8 Apr 2011 12:58:34 -0400, Tim Arnold
  tim.arn...@sas.com wrote:
 :  If you already know LaTeX, you might experiment with the *.dtx docstrip
 :  capability.

 Hi.  Hmmm.  That's a new thought.  I never thought of using docstrip
 with anything but LaTeX.  It sounds like a rather primitive tool for
 handling python code, and I would expect some serious trouble getting
 sensible highlighting in vim/eclim (or most other editors for that
 matter).  But I'll give it a thought.  Thanks.

 :  It has some pain points if you're developing from scratch, but I use it 
 once
 :  I've got a system in reasonable shape.

 Hmmm.  I wonder if I am every going to reach that stage :-)

 : You have full control over the
 :  display and you can make the code files go anywhere you like when you 
 run
 :  pdflatex on your file.

 If you use docstrip with python, what packages do you use to highlight
 code and markup programming concepts (methods/classes/variables)?
 If I may ask ...

 -- 
 :-- Hans Georg

I don't use anything special, just the verbatim environment is fine for my 
purposes.  But you might like the listings package which iirc has syntax 
highlighting built-in for python. ah, yes:
http://en.wikibooks.org/wiki/LaTeX/Packages/Listings

There's also the 'fancyvrb' package:
http://www.ctan.org/tex-archive/macros/latex/contrib/fancyvrb

good luck,
--Tim


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Help with regex needed

2011-04-11 Thread Yuri Slobodyanyuk

Good day everyone,
I am trying to make this pretty simple regex to work but got stuck,
I'd appreciate your help .
Task: Get current date , then read file of format below, find the line that
matches
the current date of month,month and year and extract the number from such
line.
Here is what I did , but if i run it at 11 April 2011 ...
   - regex pattern_match  matches nothing
   - regex pattern_test  matches the line 4141411 Fri 11 11 2011 , logical
as it is the last matching line in year 2011 with the date of 11th.
My question - why regex pattern_match  does not match anything and how to
make it match the exact line i want.
Thanks
Yuri

from datetime import datetime, date, time
import re
today_day = datetime.now()
time_tuple= today_day.timetuple()
pattern_match = re.compile(([0-9])+ + +  Fri + + str(time_tuple[1]) + 
+  +   str(time_tuple[2]) +  +  +  str(time_tuple[0]) +  +)
hhh = open(file_with_data.data,'r')
pattern_test =  re.compile(([0-9]+) + .*  +  + +
str(time_tuple[2]).strip(' \t\n\r') +  +  + str(time_tuple[0]).strip('
\t\n\r') )
for nnn in hhh:
if  (re.search(pattern_test,nnn)):
   print nnn.split()[0]

111 Fri 4  8 2011
2323232 Fri 4 15 2011
4343434 Fri 4 22 2011
8522298 Fri 4 29 2011
.
5456678 Fri 10 28 2011
563 Fri 11  4 2011
4141411 Fri 11 11 2011
332 Fri 11 18 2011

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Re: Help with regex needed

2011-04-11 Thread Kushal Kumaran

On Tue, Apr 12, 2011 at 10:50 AM, Yuri Slobodyanyuk
yuri.slobodyan...@gmail.com wrote:
 Good day everyone,
 I am trying to make this pretty simple regex to work but got stuck,
 I'd appreciate your help .
 Task: Get current date , then read file of format below, find the line that
 matches
 the current date of month,month and year and extract the number from such
 line.
 Here is what I did , but if i run it at 11 April 2011 ...
    - regex pattern_match  matches nothing
    - regex pattern_test  matches the line 4141411 Fri 11 11 2011 , logical
 as it is the last matching line in year 2011 with the date of 11th.
 My question - why regex pattern_match  does not match anything and how to
 make it match the exact line i want.
 Thanks
 Yuri

Consider using datetime.strptime to parse dates and times.  You will
have to strip off the first column since it doesn't look like part of
the date itself.


 from datetime import datetime, date, time
 import re
 today_day = datetime.now()
 time_tuple= today_day.timetuple()
 pattern_match = re.compile(([0-9])+ + +  Fri + + str(time_tuple[1]) + 
 +  +   str(time_tuple[2]) +  +  +  str(time_tuple[0]) +  +)
 hhh = open(file_with_data.data,'r')
 pattern_test =  re.compile(([0-9]+) + .*  +  + +
 str(time_tuple[2]).strip(' \t\n\r') +  +  + str(time_tuple[0]).strip('
 \t\n\r') )
 for nnn in hhh:
     if  (re.search(pattern_test,nnn)):
    print nnn.split()[0]

 111 Fri 4  8 2011
 2323232 Fri 4 15 2011
 4343434 Fri 4 22 2011
 8522298 Fri 4 29 2011
 .
 5456678 Fri 10 28 2011
 563 Fri 11  4 2011
 4141411 Fri 11 11 2011
 332 Fri 11 18 2011

 --


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kushal
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Re: Help with regex needed

2011-04-11 Thread Chris Rebert

On Mon, Apr 11, 2011 at 10:20 PM, Yuri Slobodyanyuk
yuri.slobodyan...@gmail.com wrote:
 Good day everyone,
 I am trying to make this pretty simple regex to work but got stuck,
 I'd appreciate your help .
 Task: Get current date , then read file of format below, find the line that
 matches
 the current date of month,month and year and extract the number from such
 line.
 Here is what I did , but if i run it at 11 April 2011 ...
    - regex pattern_match  matches nothing
    - regex pattern_test  matches the line 4141411 Fri 11 11 2011 , logical
 as it is the last matching line in year 2011 with the date of 11th.
 My question - why regex pattern_match  does not match anything and how to
 make it match the exact line i want.
 Thanks
 Yuri

 from datetime import datetime, date, time
 import re
 today_day = datetime.now()
 time_tuple= today_day.timetuple()
 pattern_match = re.compile(([0-9])+ + +  Fri + + str(time_tuple[1]) + 
 +  +   str(time_tuple[2]) +  +  +  str(time_tuple[0]) +  +)
   ^^

This trailing  + *requires* that the lines have trailing spaces. Do
they? Such files typically don't, and your example input doesn't
either (although that may be due to email formatting lossage).

Cheers,
Chris
--
http://blog.rebertia.com

 hhh = open(file_with_data.data,'r')
 pattern_test =  re.compile(([0-9]+) + .*  +  + +
 str(time_tuple[2]).strip(' \t\n\r') +  +  + str(time_tuple[0]).strip('
 \t\n\r') )
 for nnn in hhh:
     if  (re.search(pattern_test,nnn)):
    print nnn.split()[0]

 111 Fri 4  8 2011
 2323232 Fri 4 15 2011
 4343434 Fri 4 22 2011
 8522298 Fri 4 29 2011
 .
 5456678 Fri 10 28 2011
 563 Fri 11  4 2011
 4141411 Fri 11 11 2011
 332 Fri 11 18 2011
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[issue11825] faulthandler: failure without threads


New submission from Stefan Krah stefan-use...@bytereef.org:

Hi, the tests fail on Debian if the option --without-threads is used:

./configure --with-pydebug --without-threads
make
make test

./python -Wd -E -bb  ./Lib/test/regrtest.py -l 
== CPython 3.3a0 (default:9140f2363623+, Jan 30 2011, 04:52:32) [GCC 4.1.2 
20061115 (prerelease) (Debian 4.1.1-21)]
==   Linux-2.6.23.1-i686-with-debian-4.0 little-endian
==   /home/stefan/hg/default/build/test_python_24329
Testing with flags: sys.flags(debug=0, inspect=0, interactive=0, optimize=0, 
dont_write_bytecode=0, no_user_site=0, no_site=0, ignore_environment=1, 
verbose=0, bytes_warning=2, quiet=0)
[  1/355] test_grammar
Traceback (most recent call last):
  File ./Lib/test/regrtest.py, line 1607, in module
main()
  File ./Lib/test/regrtest.py, line 650, in main
rerun_failed=verbose3, timeout=timeout)
  File ./Lib/test/regrtest.py, line 824, in runtest
faulthandler.dump_tracebacks_later(timeout, exit=True)
AttributeError: 'module' object has no attribute 'dump_tracebacks_later'

--
assignee: haypo
components: Tests
messages: 133500
nosy: haypo, skrah
priority: normal
severity: normal
status: open
title: faulthandler: failure without threads
type: behavior
versions: Python 3.3

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[issue11826] Leak in atexitmodule


New submission from Stefan Krah stefan-use...@bytereef.org:

Valgrind reports a leak (definitely lost) in atexitmodule.c. The
patch fixes the problem.

--
components: Extension Modules
files: atexit-leak.patch
keywords: patch
messages: 133501
nosy: skrah
priority: normal
severity: normal
stage: patch review
status: open
title: Leak in atexitmodule
type: resource usage
versions: Python 3.2, Python 3.3
Added file: http://bugs.python.org/file21610/atexit-leak.patch

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[issue10156] Initialization of globals in unicodeobject.c


Stefan Krah stefan-use...@bytereef.org added the comment:

[Merging with issue 11402]

Daniel's patch is much simpler, but I think that unicode_empty and
unicode_latin1 would need to be protected before _PyUnicode_Init
is called.

Is the module initialization procedure documented somewhere? I get
the impression that unicodeobject.c depends on dict.c and dict.c
depends on unicodeobject.c.

--
nosy: +stutzbach
Added file: http://bugs.python.org/file21611/unicode-leak.patch

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[issue11402] _PyUnicode_Init leaks a little memory once


Stefan Krah stefan-use...@bytereef.org added the comment:

This should be a duplicate of issue 10156.

--
nosy: +skrah
resolution:  - duplicate
stage: patch review - committed/rejected
status: open - closed
superseder:  - Initialization of globals in unicodeobject.c

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[issue10156] Initialization of globals in unicodeobject.c


Stefan Krah stefan-use...@bytereef.org added the comment:

Stefan Krah rep...@bugs.python.org wrote:
 Is the module initialization procedure documented somewhere? I get
 the impression that unicodeobject.c depends on dict.c and dict.c
 depends on unicodeobject.c.

s/dict.c/dictobject.c/

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[issue11593] Add encoding parameter to logging.basicConfig

2011-04-11 Thread Vinay Sajip


Vinay Sajip vinay_sa...@yahoo.co.uk added the comment:

handlers parameter now added to logging.basicConfig(), which covers this use 
case:

logging.basicConfig(handlers=[logging.FileHandler('test.log', 'w', 'utf-8')])

Ref: changeset c9e9142d82d6

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[issue11369] Add caching for the isEnabledFor() computation

2011-04-11 Thread Vinay Sajip


Vinay Sajip vinay_sa...@yahoo.co.uk added the comment:

I'll regretfully have to mark this as wontfix, since adding threading 
interlocks for correct operation in multi-threaded environments will negate the 
performance benefit.

--
resolution:  - wont fix
status: open - closed

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[issue11827] mention of list2cmdline() in docs of subprocess.Popen

2011-04-11 Thread Eli Bendersky


New submission from Eli Bendersky eli...@gmail.com:

The documentation of subprocess.Popen mentions a function named list2cmdline():


  On Windows: the Popen class uses CreateProcess() to execute the child 
program, which operates on strings. If args is a sequence, it will be converted 
to a string using the list2cmdline() method. Please note that not all MS 
Windows applications interpret the command line the same way: list2cmdline() is 
designed for applications using the same rules as the MS C runtime.


I find this rather opaque and useless. list2cmdline() in subprocess is publicly 
accessible (doesn't begin with underscores) but it isn't documented.

The solution can be one of the following:

1. Document list2cmdline in the docs of subprocess, making the reference to is 
useful
2. Don't mention list2cmdline and instead mention what it does with the 
command-line list

--
assignee: docs@python
components: Documentation
messages: 133507
nosy: docs@python, eli.bendersky
priority: normal
severity: normal
stage: needs patch
status: open
title: mention of list2cmdline() in docs of subprocess.Popen
type: behavior
versions: Python 3.2

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[issue11782] email.generator.Generator.flatten() fails

2011-04-11 Thread Steffen Daode Nurpmeso


Steffen Daode Nurpmeso sdao...@googlemail.com added the comment:

So here is a patch which steps forward the not-yet-fully-completed 
transition to the mixed bytes/str EMail stuff. 
Test coverage is available if you patch in 
http://bugs.python.org/file21549/11684.1.diff from #11684.
(Because i leak the great picture of this module ... say.)

--
keywords: +patch
Added file: http://bugs.python.org/file21612/11782.1.diff

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___diff --git a/Lib/email/generator.py b/Lib/email/generator.py
--- a/Lib/email/generator.py
+++ b/Lib/email/generator.py
@@ -297,10 +297,12 @@
 # message/rfc822.  Such messages are generated by, for example,
 # Groupwise when forwarding unadorned messages.  (Issue 7970.)  So
 # in that case we just emit the string body.
-payload = msg.get_payload()
+payload = msg._payload
 if isinstance(payload, list):
 g.flatten(msg.get_payload(0), unixfrom=False, linesep=self._NL)
 payload = s.getvalue()
+else:
+payload = self._encode(payload)
 self._fp.write(payload)
 
 # This used to be a module level function; we use a classmethod for this
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[issue11808] $MACOSX_DEPLOYMENT_TARGET mismatch ... during configure

2011-04-11 Thread Steffen Daode Nurpmeso

Steffen Daode Nurpmeso sdao...@googlemail.com added the comment:

On Sat, Apr 09, 2011 at 03:58:11PM +, Ned Deily wrote:
By the way, since you've asked about it before,
MACOSX_DEPLOYMENT_TARGET is a standard feature of the Apple gcc
tool chain and is used to support builds for multiple versions.
See -mmacosx-version-min in the OS X man (1) gcc and
http://developer.apple.com/library/mac/#documentation/MacOSX/Conceptual/BPFrameworks/Concepts/WeakLinking.html

P.S.:
Thank you for this information.
You know, we here (and i personally too) don't fiddle around
with this, because there is no time left over for such things.

We have discovered flags which work (especially hairy for ld(1)
and dynamic libraries and concurrent installs), wrote a bunch of
Perl configure scripts which use '$^O eq' and, for performance,
$COMPILE_PTF($TCC, $TEXE, 'sysdeps/generic/x86/cnf.cpuid.c'),
and try to realize the rest with good coding style.
No '.weak' and other maybe object file format dependend stuff
around here.

And i just wanted to try Mac OS once, so i bought a MacBook.
It looks beautiful and fancontrol is automatic and fantastic and
i try hard to forget that i'm looking at OpenGL and myriads of
floating-point calculations.

But i was out of this game once i've written an OGG player (there
was none and no /dev/whatever accessible here), trying AudioUnit
and CoreAudio, which confirm something in an event handler and
have forgotten it after that returns. And then there was a crash
and i discovered that Mazzoni's Audacity includes comments on this
crash in the Mac OS sources from a *long* time ago.
And so i decided that i don't want to do Apple, and lucky me
i don't need to make money with doing so nonetheless.

And now i think you have the complete picture on that.
Thanks again.
:)

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[issue11827] mention of list2cmdline() in docs of subprocess.Popen


R. David Murray rdmur...@bitdance.com added the comment:

I vote for (2) (I presume 'it' in that sentence is 'subprocess').  list2cmdline 
shouldn't be a real public method, at least not without the issues 
surrounding being given careful design attention.

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[issue11827] mention of list2cmdline() in docs of subprocess.Popen

2011-04-11 Thread Eli Bendersky


Eli Bendersky eli...@gmail.com added the comment:

I also prefer (2) since I see no reason for the user to use list2cmdline() 
directly, let alone from subprocess (had there been rationale for such a public 
function it should probably be in another module).

As for 'it', I guess you can say it means 'subprocess' or 'list2cmdline', 
doesn't matter which.

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[issue11783] email parseaddr and formataddr should be IDNA aware


R. David Murray rdmur...@bitdance.com added the comment:

Patch mostly looks good to me, modulo some English wording that I'll fix up 
when I commit it.

The issue with the '@' is that it might not be there.  So you do need to check 
for that case (it means the domain part defaults to the 'local' domain).  I 
should double check the RFC to make sure that's the only special case, but I 
believe it is.

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[issue11650] Faulty RESTART/EINTR handling in Parser/myreadline.c

2011-04-11 Thread Steffen Daode Nurpmeso


Steffen Daode Nurpmeso sdao...@googlemail.com added the comment:

I've opened it and it's fixed, so i'll close it now.

If someone finds the single bug in 11650.termios-1.diff
in termios_resume() and also has an idea of how to call
termios_suspend() in case Python crashes or gives back
the terminal in any other way i would vote for reopening
this and using my version, because it is better.

Take care otherwise.
Thanks, haypo.

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[issue11827] mention of list2cmdline() in docs of subprocess.Popen


R. David Murray rdmur...@bitdance.com added the comment:

Ah, right.  I guess I was advocating that the docs be written from the 
perspective that list2cmdline doesn't exist as an identifiable entity.  From 
the POV of the updated docs, it is just subprocess's behavior, and list2cmdline 
is an implementation detail.  Which is what you were saying.

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[issue11825] faulthandler: failure without threads

2011-04-11 Thread STINNER Victor


STINNER Victor victor.stin...@haypocalc.com added the comment:

Attached patch disables regrtest.py timeout if 
faulthandler.dump_tracebacks_later() is missing. It prints a warning at 
startup, and an error if --timeout option is used.

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Added file: http://bugs.python.org/file21613/timeout.patch

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[issue11817] berkeley db 5.1 support


Jesús Cea Avión j...@jcea.es added the comment:

The 3rd party package is activelly maintained (by me :) in 
http://www.jcea.es/programacion/pybsddb.htm. BDB 5.1 support is there.

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[issue8428] buildbot: test_multiprocessing timeout (test_notify_all? test_pool_worker_lifetime?)

2011-04-11 Thread STINNER Victor


STINNER Victor victor.stin...@haypocalc.com added the comment:

 (Victor, please don't file many bugs in a single issue!)

I thought that these issues were the same.

Victor

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[issue4606] Passing 'None' if argtype is set to POINTER(...) doesn't always result in NULL

2011-04-11 Thread olt


olt o...@bogosoft.com added the comment:

For anyone that has to use a Python version where this bug is present, it is 
possible to manually create a NULL pointer.

For the example:

POINTER(c_double)()

This works, at least in my case.

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[issue11783] email parseaddr and formataddr should be IDNA aware

2011-04-11 Thread Torsten Becker


Torsten Becker torsten.bec...@gmail.com added the comment:

 modulo some English wording that I'll fix up when I commit it.

Yeah, sorry for that, I seem to have trouble with writing good documentation. 
:)  I'll have a look at the documents referenced by [1] to improve my writing.

 The issue with the '@' is that it might not be there.

I added a fix and a test for this in v2.  However, when reading through the RFC 
[2] and Wikipedia [3], it seems like this is not actually allowed.

Is there a way to internationalize the local-part as well?  That is the only 
part which is missing now that domain and real name are covered.


[1]: http://docs.python.org/devguide/docquality.html
[2]: http://tools.ietf.org/html/rfc5322#section-3.4
[3]: http://en.wikipedia.org/wiki/Email_address#Invalid_email_addresses

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Added file: http://bugs.python.org/file21614/issue-11783-v2.patch

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[issue11810] _socket fails to build on OpenIndiana


Changes by Jesús Cea Avión j...@jcea.es:


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[issue11825] faulthandler: failure without threads


Stefan Krah stefan-use...@bytereef.org added the comment:

The patch works. Is it expected that dump_tracebacks_later is missing
when building --without-threads? If so, the warning is probably
confusing for the uninitiated.

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[issue11816] Refactor the dis module to provide better building blocks for bytecode analysis


Changes by Jesús Cea Avión j...@jcea.es:


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[issue11816] Refactor the dis module to provide better building blocks for bytecode analysis


Jesús Cea Avión j...@jcea.es added the comment:

Do not forget to update docs too.

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[issue11783] email parseaddr and formataddr should be IDNA aware


R. David Murray rdmur...@bitdance.com added the comment:

Hmm.  You are correct.  I thought the RFC's covered this case, but apparently 
they don't.

The email package gets used in MUA contexts, where the domain part of the 
address may be omitted and the MUA must fill it in before transmitting the 
message to the MTA.  And some MTAs will fill in the local domain if it is 
omitted, so actually it applies in an MTA context, too.  So we need to support 
this case even if it isn't covered by the RFCs.

Thanks, the revised patch looks good.

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[issue5162] multiprocessing cannot spawn child from a Windows service

2011-04-11 Thread Antoine Pitrou


Changes by Antoine Pitrou pit...@free.fr:


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components: +Windows
nosy: +brian.curtin, tim.golden
versions: +Python 3.3

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[issue5162] multiprocessing cannot spawn child from a Windows service

2011-04-11 Thread Antoine Pitrou


Changes by Antoine Pitrou pit...@free.fr:


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stage: test needed - patch review

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[issue5162] multiprocessing cannot spawn child from a Windows service

2011-04-11 Thread Brian Curtin


Brian Curtin br...@python.org added the comment:

This looks reasonable to me. If no one beats me to it, I'll check it in tonight.

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[issue11816] Refactor the dis module to provide better building blocks for bytecode analysis

2011-04-11 Thread Alexander Belopolsky


Changes by Alexander Belopolsky belopol...@users.sourceforge.net:


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[issue11822] Improve disassembly to show embedded code objects

2011-04-11 Thread Alexander Belopolsky


Changes by Alexander Belopolsky belopol...@users.sourceforge.net:


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[issue11822] Improve disassembly to show embedded code objects

2011-04-11 Thread Alexander Belopolsky


Alexander Belopolsky belopol...@users.sourceforge.net added the comment:

Would you like to display lambdas as well?


 dis('lambda x: x**2')
  1   0 LOAD_CONST   0 (code object lambda at 
0x1005c9ad0, file dis, line 1) 
  3 MAKE_FUNCTION0 
  6 RETURN_VALUE 

code object lambda at 0x1005cb140, file dis, line 1:
  1   0 LOAD_FAST0 (x) 
  3 LOAD_CONST   1 (2) 
  6 BINARY_POWER 
  7 RETURN_VALUE 


I like the idea, but would rather see code objects expanded in-line, possibly 
indented rather than at the end.

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[issue11803] Memory leak in sub-interpreters

2011-04-11 Thread Swapnil Talekar


Swapnil Talekar swapnil...@gmail.com added the comment:

Sorry about the previous report. I should have tested it thoroughly. Yes, it 
does not seem to rise but eventually it does. This time, I'v added garbage 
collection right after the subinterpreter is shutdown. The memory consumption 
does not seem to rise above 8MB when you start the test. But if you leave it 
running for couple of hours I have seen it grown upto 24MB. I haven't tested 
more that that but it seems that if you run it for couple of days, memory 
consumption will grow upto few 100 MB.
This is strange because mod_python doesn't seem to be doing anything special to 
handle this, then how does it work with mod_python?

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[issue11803] Memory leak in sub-interpreters

2011-04-11 Thread Swapnil Talekar


Changes by Swapnil Talekar swapnil...@gmail.com:


--
resolution: invalid - 
status: closed - open
versions: +Python 2.6

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[issue11818] tempfile.TemporaryFile example in docs doesnt work

2011-04-11 Thread Éric Araujo


Éric Araujo mer...@netwok.org added the comment:

May I ask why 3.1 was not fixed too?

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[issue11828] startswith and endswith don't accept None as slice index

2011-04-11 Thread Marijn Schouten


New submission from Marijn Schouten hk...@gentoo.org:

startswith and endswith don't accept None as slice index, as shown by below 
interaction. Same behavior for python-3.1.3(with print()) and python-2.7.1. If 
instead this is intended behavior then the error message is wrong.

$ python -c print 'abc'[-1:None]
c
$ python -c print 'abc'.endswith('c',-1,None)
Traceback (most recent call last):
  File string, line 1, in module
TypeError: slice indices must be integers or None or have an __index__ method

--
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messages: 133527
nosy: hkBst
priority: normal
severity: normal
status: open
title: startswith and endswith don't accept None as slice index
type: behavior
versions: Python 2.7, Python 3.1

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[issue11828] startswith and endswith don't accept None as slice index

2011-04-11 Thread Marijn Schouten


Marijn Schouten hk...@gentoo.org added the comment:

I remark that `find' and `index' do accept None:

$ python3 -c print('abc'.find('c',None,None))
2

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[issue11803] Memory leak in sub-interpreters