On Fri, 21 Nov 2008 00:20:49 -0200, Gabriel Genellina <[EMAIL PROTECTED]> wrote:
En Thu, 20 Nov 2008 14:24:20 -0200, Krzysztof Retel
<[EMAIL PROTECTED]> escribió:
On Nov 20, 4:00 pm, [EMAIL PROTECTED] wrote:
On 20 Nov, 16:03, Krzysztof Retel <[EMAIL PROTECTED]>
wrote:
> I am struggling writing
simpler ways, though, based on other XML libraries.
Jean-Paul
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the `unittest´ module in the standard library and take things to the
next level.
Jean-Paul
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ch an implementation would deal with the
fact that telnet encodes \r as \r\0 for you.
Twisted includes a telnet implementation, as well as facilities for reading
stdin asynchronously (which will let you avoid indefinite hangs).
Jean-Paul
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dy. The parent then just waits for
those bytes. It looks like you entirely control the child in this case,
so that should be possible here.
Alternatively, maybe by "properly initialized" you mean something very
specific about how subprocess.Popen creates processes. If so
On Thu, 26 Feb 2009 23:32:13 +0100, jkv wrote:
Jean-Paul Calderone wrote:
sys.stdout.write('Password: ');
#IAC DO ECHO sys.stdout.write('\xFF\xFB\x01')
password = raw_input()
If the client sends 'qwerty\r\n' everything is fine and the password ge
ng which would cause a correctly written server (in C or any
other language with BSD socket APIs) to fail. I suggest investigating
how telnet and your Python client differ, then looking into the C code
to find out how that difference can trigger a bug in it.
Jean-Paul
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ython isn't available, cgi is said to be slow, mod_wsgi looks
complicated...
What would you suggest?
Try Python 2.x instead. If you go with Python 3, you're going to run
into the same limited library selection over and over.
Jean-Paul
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yright", "credits" or "license" for more information.
import os
pid = os.fork()
As soon as this returns, you have two CPython processes reading from stdin
and writing to stdout. They fight over your input and their output gets
interleaved in non-deterministic ways. Basical
On Fri, 6 Mar 2009 14:50:51 -0800, Minesh Patel wrote:
I am trying to figure out the best approach to solve this problem:
I want to poll various directories(can be run in the main thread).
Once I notice a file has been added to any directory, I grab a lock,
spawn a thread to go perform the nece
en you can probably see the behavior you were expecting.
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is to work around a bug in
CPython on Windows where a process in a blocking read cannot be interrupted
by C-c in the console? If that's the case, there may be other approaches
to solving the problem (like fixing the bug in CPython which causes this).
Jean-Paul
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ntrol (you might have something like 32kb or 64kb level
control).
What abt in Python3 ?
It seems to have some header like the one below : b'b495 - binary mode
with 46229 bytes ? Or is it something else ?
That's just a bug in urllib in Python 3.0.
Jean-Paul
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etter choice for me, except that Python is
much more elegant. :-)
I'm sure people will tell you that this is a good use of threads and that
Python is up to the task. I think it's a bad use of threads, but with a
different approach, I still think Python is up to the task.
Jean-Paul
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On Tue, 17 Mar 2009 15:17:56 + (UTC), "R. David Murray"
wrote:
Jean-Paul Calderone wrote:
On Tue, 17 Mar 2009 12:15:23 +0530, Saurabh wrote:
>> This isn't exactly how things work. The server *sends* you bytes. It can
>> send you a lot at once. To some exte
processes instead,
if there really is more hardware that's sitting idle with your single
threaded version.
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ust surely
fail. For example, uid/gid setting is broken.
I'd recommend adding an automated test suite, fixing all the issues that
come up during that process, and then asking for scrutiny again.
Jean-Paul
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ed as could be (it's also only 14 lines long).
Jean-Paul
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t you integrate with a
GUI toolkit. Since Twisted encourages you to write programs which deal
with things asynchronously in a single thread, if you use it, your
concerns about data exchange, locking, and timing should be addressed
as a simple consequence of your overall program structure.
Je
On Sun, 22 Mar 2009 10:19:58 +1100, Ben Finney
wrote:
Jean-Paul Calderone writes:
The biggest shortcoming seems to be a complete lack of unit tests.
A full unit test suite is in the source distribution's ‘tests/’
directory. You can run it with ‘python ./setup.py test’.
Of course th
On Sun, 22 Mar 2009 03:13:36 -0700 (PDT), Nick Timkovich
wrote:
On Mar 21, 9:19 pm, Jean-Paul Calderone wrote:
On Sat, 21 Mar 2009 13:52:21 -0700 (PDT), Nick Timkovich
wrote:
>I've been working on a program that will talk to an embedded device
>over the serial port, using some b
ets paused, and when the buffer is empty
again, it gets resumed.
Hope this helps!
Jean-Paul
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On Mon, 23 Mar 2009 05:30:04 -0500, Nick Craig-Wood wrote:
Jean-Paul Calderone wrote:
[snip]
In the case of a TCP to serial forwarder, you don't actually have to
implement either a producer or a consumer, since both the TCP connection
and the serial connection are already both prod
onds, an 1875% improvement.
Surely you mean a 94.7% improvement?
Jean-Paul
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On Tue, 24 Mar 2009 15:42:46 +1100, Ben Finney
wrote:
Jean-Paul Calderone writes:
[snip]
An additional feature which would be useful for the library to
provide, however, would be the setting of euid and egid instead of
uid and gid. This is necessary, for example, to write an SSH daemon
://twistedmatrix.com/trac/wiki/TwistedTrial
Jean-Paul
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On Tue, 24 Mar 2009 22:20:49 -0700, John Nagle wrote:
Jean-Paul Calderone wrote:
On Mon, 23 Mar 2009 05:30:04 -0500, Nick Craig-Wood
wrote:
Jean-Paul Calderone wrote:
[snip]
After bringing in all the heavy machinery of Twisted,
you're still polling at 10Hz. That's disappointi
On Wed, 25 Mar 2009 22:23:25 -0700, John Nagle wrote:
Jean-Paul Calderone wrote:
On Tue, 24 Mar 2009 22:20:49 -0700, John Nagle wrote:
Jean-Paul Calderone wrote:
On Mon, 23 Mar 2009 05:30:04 -0500, Nick Craig-Wood
wrote:
Jean-Paul Calderone wrote:
[snip]
After bringing in all the
rol of an application using
the BSD socket API.
Jean-Paul
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ho its Daddy is?
Inspecting the call stack or the execution context to decide what to do is
a really awful idea. It's complicated to implement, complicated to maintain,
complicated to read, and there's no reason to do it. Just do the simple
thing - add a parameter or make two separate
ncies is always a tricky and in need of careful weighting
thing to do.
This has been discussion in detail on python-dev (more than once, I think,
even). Here's the top of one such thread:
http://mail.python.org/pipermail/python-dev/2008-November/083315.html
Jean-Paul
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rolled by system configuration in various ways,
and may do more than just DNS lookups (in fact, it may even be
configured not to use DNS at all!). But it's pretty close, and may
be close enough for your purposes.
Jean-Paul
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On Wed, 22 Apr 2009 20:50:51 +0200, Christian Heimes wrote:
Jean-Paul Calderone wrote:
I'm not sure what the easiest way to determine whether Python has found
gethostbyname_r or not on your system is. The configure script used to
build Python will probably tell, but I doubt you have
ill probably produce significantly better results.
Jean-Paul
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On Thu, 23 Apr 2009 15:21:21 -0700 (PDT), grocery_stocker
wrote:
Say I have a script that fetches data from a website every hour. Is
there a general solution or is the solution operating system specific?
General solution to what problem?
Jean-Paul
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nting
many (but not all) of the features of the terminal. You can find the API
documentation online:
http://twistedmatrix.com/documents/current/api/twisted.conch.insults.html
Jean-Paul
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https://bugs.launchpad.net/pyopenssl
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Piet van Oostrum
URL:http://pietvanoostrum.com[PGP 8DAE142BE17999C4]
Private email: p...@vanoostrum.org
Thanks Everyone By your guidance the code worked fine
I can send mails in multi threaded environment.
Is this only way to send mails concurrently or any other method
aviable?
Here's another way:
from twisted.mail.smtp import sendmail
from twisted.internet import reactor
from twisted.python.log import err
MAILSERVER = ...
listTo = [...]
FROM = ...
MSGBODY = ...
done = sendmail(MAILSERVER, FROM, listTo, MSGBODY)
done.addErrback(err)
done.addCallback(lambda ignored: reactor.stop())
reactor.run()
Jean-Paul
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table. You can run and stop them
once. After you've stopped a reactor, you cannot run it again. This is the
cause of your problem.
Jean-Paul
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On Tue, 12 May 2009 14:30:04 -0500, Nick Craig-Wood wrote:
Gabriel wrote:
Jean-Paul Calderone escribió:
> None of the reactors in Twisted are restartable. You can run and
stop them
> once. After you've stopped a reactor, you cannot run it again. This is
> the
> caus
/howto/udp.html
You can trivially change the first example to handle multiple sockets -
just add more reactor.listenUDP calls.
Jean-Paul
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;.
However, I think it was right before. Consider:
def foo():
yield
Now, is `foo´ a generator? If so, what is `foo()´?
With the "generator function"/"generator" terminology, it is unambiguous
to say "`foo´ is a generator function and `foo()´ is a generator".
Jean-Paul
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at's a recipe for failure.
Minimizing differences between development and deployment is a *great*
thing. There are certainly cases where differences are necessary, but
one should strive to make them the exception, not the rule.
Jean-Paul
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, and I would be surprised if anybody else
on this list has done so in the past, in a context other than debugging.
So, do you mind sharing your current problem? Maybe then it'll make more
sense why one might want to do this.
Jean-Paul
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print line
but when I run
$ gzcat bigXMLfile.gz | IOtest.py
but it hangs then dies.
file.readlines reads the entire file into a list in memory. You may not
want to do this. You could try, instead, iterating over "sys.stdin",
which should not try to load the entire file into memor
rotocol to determine when all
data has been received. For example, you might length prefix the
data, or you might insert a delimiter (or a terminator) at the end. Or
if there is exactly one message to receive, then you should just read
until the recv call returns '', indicating EOF.
Jean-Paul
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th prefix the
data, or you might insert a delimiter (or a terminator) at the end. Or
if there is exactly one message to receive, then you should just read
until the recv call returns '', indicating EOF.
Jean-Paul
ok thanks, but I am true greenhorn, so you think that the best way is
received = []
while True:
try:
bytes = server.recv(1024 * 16)
except socket.error, e:
if e.errno == EINTR:
continue
else:
break
if not by
he reference dst has to it. You can fix this by
having Popen close all file descriptors except 0, 1, and 2 before it execs
cat - pass close_fds=True to the 2nd Popen call and you should get the
behavior you want.
Jean-Paul
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h default timeout
value.
Twisted, for example, uses a default of 0.01 ms for all its reactors.
I'm not sure this is right. What timeout are we talking about? Twisted
only wakes up when necessary.
Jean-Paul
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On Tue, 13 May 2008 14:05:43 -0700 (PDT), Giampaolo Rodola' <[EMAIL PROTECTED]>
wrote:
On 13 Mag, 22:16, Jean-Paul Calderone <[EMAIL PROTECTED]> wrote:
On Tue, 13 May 2008 11:50:30 -0700 (PDT), Giampaolo Rodola' <[EMAIL PROTECTED]>
wrote:
>On 13 Mag, 17:59, J
levant. If someone wants timed events in their loop,
asyncore isn't standing in their way. On the other hand, I didn't
this thread (or maybe just this part of the thread) start out with
a question about asyncore throughput? I have no idea what that
might have to do with this.
Jean-Paul
-
On Tue, 13 May 2008 20:56:03 -0400, Jean-Paul Calderone <[EMAIL PROTECTED]>
wrote:
On Tue, 13 May 2008 16:44:11 -0700 (PDT), Giampaolo Rodola'
<[EMAIL PROTECTED]> wrote:
[snip]
To support scheduling calls, you just have to know when the next call is
going to happen. Then
On Tue, 13 May 2008 18:20:29 -0700 (PDT), Giampaolo Rodola' <[EMAIL PROTECTED]>
wrote:
On 14 Mag, 02:56, Jean-Paul Calderone <[EMAIL PROTECTED]> wrote:
Why? Isn't this why subtraction exists? If there is a call scheduled to
happen at T1 and the current time is T2, then
what "single-asset" means, but it gives the impression (and
the term somewhat suggests) that this means there's a single executable
that does all of this (compare to gcc's design, where support for cross
compiling to another arch is provided by a separate executable).
"Shotgun" probably just sounds cool.
Jean-Paul
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,
Take a look at the traceback module. The excepthook gets called with
an exception type, instance, and traceback object. The traceback module
is good at turning these things into strings.
Jean-Paul
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ooks to me like all signals are masked before entering wait(). Can
someone familiar with the internals explain and/or justify this
behavior? Thanks,
^C only kills the main thread. Use Control-Break to kill all threads.
Look at that program. It's single-threaded. Where do you think the ^C
quot;.
So, is there and suggestion and explaination about it?
file.read() reads the entire contents of the file. Your code never closes
the write end of the pipe, so the read can never succeed - there is always
more for it to read.
Jean-Paul
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. Access is synchronized automatically by virtue of the
fact that there is no pre-emptive multithreading in operation. This is
one of the many advantages of avoiding threads. :) There may be valid
arguments against callbacks, but this isn't one of them.
Jean-Paul
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On Mon, 16 Jun 2008 01:01:47 +0900, js <[EMAIL PROTECTED]> wrote:
Hi list,
I'm trying to build a package for python modules.
When I just wanted to have a package for Python2.5, this is an easy task,
but in most cases, it's not enough.
Sometimes I need python2.4, 2.5, 2.6 or 3.0 etc.
The problem
On Mon, 16 Jun 2008 01:37:47 +0900, js <[EMAIL PROTECTED]> wrote:
On Mon, Jun 16, 2008 at 1:16 AM, Jean-Paul Calderone <[EMAIL PROTECTED]> wrote:
On Mon, 16 Jun 2008 01:01:47 +0900, js <[EMAIL PROTECTED]> wrote:
Hi list,
I'm trying to build a package for python modules
On Mon, 16 Jun 2008 08:39:52 +1000, Ben Finney <[EMAIL PROTECTED]> wrote:
Jean-Paul Calderone <[EMAIL PROTECTED]> writes:
On Mon, 16 Jun 2008 01:37:47 +0900, js <[EMAIL PROTECTED]> wrote:
>By "package", I meant APT, Ports for BSD, MacPorts, etc.
I don't kno
n = collect(NUM_GENERATIONS - 1);
collecting = 0;
}
return n;
}
If a system exception raised when executing collect(xxx), collecting state
variable would never be reset and python GC will not works forever until the
application restarted.
A system exception? What's that? C doesn't have e
On Mon, 16 Jun 2008 18:11:24 +0700, Jaimy Azle <[EMAIL PROTECTED]> wrote:
Jean-Paul Calderone wrote:
A system exception? What's that? C doesn't have exceptions.
How could I determine it? I dont know GCC implementation, and others, but C
on MSVC does have it. My appl
nywhere else, it will be
re-sized in place. This means you'll probably see sub-quadratic behavior,
but only with a version of Python where this optimization exists and only
if the code can manage to trigger it.
Jean-Paul
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On Mon, 16 Jun 2008 11:30:19 -0600, Ian Kelly <[EMAIL PROTECTED]> wrote:
On Mon, Jun 16, 2008 at 11:09 AM, Jean-Paul Calderone
<[EMAIL PROTECTED]> wrote:
It will depend what version of Python you're using and the *exact* details
of the code in question. An optimization was int
imeError.
The only slightly more complex one is to create a new Deferred in
`processResults´ and return it. Then, fire it inside `cb´ when `deferred´
is None. You also need to be slightly careful to hook up the errback
chain in this case, so that if there's some problem with getting an
iterator the
/python-list/2001-November/113994.html
Jean-Paul
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information.
a= 123456; b=123456; a is b
True
For some reason, stacking multiple statements reuses the same object.
This is because using the ";" puts the statements into the same compilation
unit as each other. So secretly an integer object is created for 123456
and then a and b are both given a reference to it. This is a different
mechanism than the other case, where the builtin integer cache causes the
literal 100 to refer to the same object each time it is evaluated.
Jean-Paul
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py under the Miscellaenous section at
http://twistedmatrix.com/projects/core/documentation/examples/
Jean-Paul
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at will automate the process of making
all .py files on my web server executable (chmod 755, or something similar).
There are several third-party SSH libraries, eg Twisted Conch and Paramiko.
Jean-Paul
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believe
it does what you are looking for.
Twisted PB goes out of its way to *not* allow arbitrary code specified by
a peer to be executed, actually. :) It is intended to be used when you
cannot trust the network (a common scenario) but still want to perform
complex operations and pass complex da
emented and whether it optimizes that case.)
CPython doesn't do tail call elimination. And indeed, function calls
in Python have a much higher fixed overhead than iteration.
Jean-Paul
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takes an instance and returns a new object which represents a
pointer to that instance.
Jean-Paul
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59
27500 8.98186042757
3 11.8042818095
32500 12.1965593712
35000 13.2735763291
37500 14.0282617344
What is it in the code snippet that slows down as n increases? Is there
something about the way low level python functions I don't understand which
is slowing me down?
Perhaps you need an in
:
... dotimes(5, block)
...
>>> f()
Traceback (most recent call last):
File "", line 1, in ?
File "", line 2, in f
File "", line 3, in dotimes
File "", line 2, in block
NameError: global name 'i' is not defined
>>
ts into one big function?
class TwoTests(unittest.TestCase):
setUpResult = None
def setUp(self):
if self.setUpResult is None:
self.setUpResult = computeIt()
...
There are plenty of variations on this pattern.
Jean-Paul
Best,
-Nikolaus
--
n do arbitrary
things.
However, one CIS written in Python (which can also handle arbitrary
builds, not just builds of Python software) is buildbot:
http://buildbot.net/
Jean-Paul
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On Tue, 29 Jul 2008 19:26:09 +0200, Nikolaus Rath <[EMAIL PROTECTED]> wrote:
Jean-Paul Calderone <[EMAIL PROTECTED]> writes:
On Tue, 29 Jul 2008 16:35:55 +0200, Nikolaus Rath <[EMAIL PROTECTED]> wrote:
Hello,
I have a number of conceptually separate tests that neverthe
On Tue, 29 Jul 2008 20:12:14 +0200, Nikolaus Rath <[EMAIL PROTECTED]> wrote:
Jean-Paul Calderone <[EMAIL PROTECTED]> writes:
On Tue, 29 Jul 2008 19:26:09 +0200, Nikolaus Rath <[EMAIL PROTECTED]> wrote:
Jean-Paul Calderone <[EMAIL PROTECTED]> writes:
On Tue, 29
tead of "incorrect". ;)
re.match = match(pattern, string, flags=0)
Try to apply the pattern at the *start* of the string, returning
a match object, or None if no match was found.
Emphasis mine.
Jean-Paul
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On Mon, 11 Aug 2008 00:47:14 +0530, "Suresh V." <[EMAIL PROTECTED]> wrote:
class A:
def add(self, x, y):
return x+y
class B:
pass
B.add = A.add
print B().add(1, 2) <- gives TypeError: unbound method add() must
be called with A instance as first ar
H with Twisted online:
http://twistedmatrix.com/projects/conch/documentation/examples/
Jean-Paul
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nce()
class Ticket(Persistence):
def __init__(self):
self.id = ticketSequence.next()
Jean-Paul
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On Thu, 14 Aug 2008 16:15:11 +0200, "Diez B. Roggisch" <[EMAIL PROTECTED]>
wrote:
Jean-Paul Calderone wrote:
On Thu, 14 Aug 2008 05:22:35 -0700 (PDT), Phillip B Oldham
<[EMAIL PROTECTED]> wrote:
[snip]
How would one assign a unique ID to the root at that point?
Her
ometimes not work (retry or manually resolve).
PostgreSQL is great and makes sequences easier than ZODB does (at least
as far as I can tell), but it's hardly _impossible_ to have a working
sequence in ZODB, and it's not even difficult, it's just not trivial.
Jean-Paul
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ld rewrite every __eq__ function and catch attribute errors, but
>that's tedious, and seemingly unpythonic. Also, I don't want an
>attribute error thrown whenever two classes are compared that don't
>have the same attributes.
>
>I have a sneaky feeling I'm d
access on X509Names
pyOpenSSL home page: http://pyopenssl.sourceforge.net/
pyOpenSSL downloads: http://sourceforge.net/project/showfiles.php?group_id=31249
Jean-Paul Calderone
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access on X509Names
pyOpenSSL home page: http://pyopenssl.sourceforge.net/
pyOpenSSL downloads: http://sourceforge.net/project/showfiles.php?group_id=31249
Jean-Paul Calderone
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>the gain is less code?
>
>are some functions only implementable recursively?
>
Function calls (recursive or otherwise) are more expensive than
for loops, so the version that replaces recursion with a loop is
faster.
Any function can be implemented without recursion, although it isn&#x
On Fri, 18 Apr 2008 11:32:15 -0700, Nick Stinemates <[EMAIL PROTECTED]> wrote:
> [snip]
>
>Yo, no one here is a child
Hi Nick,
Actually, there are a number of young people on the list. So let's keep things
civil and try to avoid using harsh language.
Thanks!
r job of releasing memory when actual use
falls below peak, but this is a difficult thing to do perfectly.
Jean-Paul
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turning control to the frame
immediately above it on the stack.
You can build a trampoline based on generators, but you can do that in
Python 2.4 just as easily as you can do it in Python 2.5.
Jean-Paul
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er/trunk/twisted/internet/defer.py#L555
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sing cStringIO doesn't rely on a very esoteric
optimization in the CPython eval loop, as well as on what references
happen to exist to what objects. For example, one might want to use a
debugger without falling back to the quadratic behavior of repeated
string concatenation. cStringIO wins out in this case.
Jean-Paul
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r simplicity of programming, not much else.
Jean-Paul
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sending and receiving, and doesn't have deadlock issues since it's
event-driven.
Jean-Paul
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if it has a 0
SO_ERROR, the connection was successful, otherwise it failed.
Jean-Paul
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no special meaning in the language.
`object´, on the other hand, is a builtin name which refers to a
particular object.
Jean-Paul
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UTF-8 formatted string:
test = u'Make \u0633\u0644\u0627\u0645, not war.'
`test´ is not a UTF-8 encoded string. It's a unicode string.
To get a UTF-8 encoded string from a unicode string, use the `encode´
method:
some_module.some_thing(test.encode('utf-8'))
Jean
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