On Nov 11, 3:13 pm, Tim Golden wrote:
> Try Celery
>
> http://ask.github.com/celery/getting-started/introduction.html
Thank you Tim, looks very interesting!
Manu
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On Nov 10, 9:19 pm, "danmcle...@yahoo.com"
wrote:
> If you are using Python 2.6 or greater, look into the multiprocessing
> module. It may contain 90% of what you need.
Thank you Dan, indeed the multi-processing module has been my first
port of call and indeed it has all the basic ingredients. Wh
Greetings everybody,
I've tried to come up with this message for a couple of weeks now and
it doesn't look like I'm getting any clearer in my thoughts so I
decided that it's probably best to take the plunge and ask you guys to
kindly throw me a rope...
What I'm trying to come up with is some kind
Thank you all for the insights. I particularly like the broad spread
of opinions on the subject.
Indeed when I wrote the original post my thoughts were with those
young students of non-English speaking countries that start learning
to program before they learn English. My case is almost one of tho
Greetings everybody,
some time ago I saw a paper that used an XSL transformation sheet to
transform (if I remember correctly) a Chinese xml file (inclusive of
Chinese-script XML tags) into an XHTML file.
More recently you might have all heard how the ICANN has opened up the
way for non-latin char
Jonathan, Stephen and Max, thank you all for the tips and tricks. Much
appreciated.
Manu
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On Aug 27, 9:42 pm, Jonathan Gardner
wrote:
> Have you heard of duck typing?
Yes.
> Ignore all those things and rely on human (aka natural language)
> documentation. That is, if you want to see if a class will work for an
> interface, go read the docs on the interface (or rather, what the
> func
Greetings everybody,
let's say I have a Class C and I'd like to verify if it implements
Interface I. If I is available to me as a class object I can use
issubclass(C, I) and I can at least verify that I is a superclass of
C. There are a couple of issues with this approach however:
1) C might over
On Aug 27, 2:01 am, a...@pythoncraft.com (Aahz) wrote:
> Well, I'm not sure about exceptions, but you almost certainly won't get
> the results you want.
What I'd like in this context is to iterate through the items in the
list without processing the same item twice and without skipping item
that a
Let's say I have a list accessed by two threads, one removing list
items via "del myList[index]" statement the other iterating through
the list and printing out the items via "for item in myList:"
statement. Am I right to say this -won't- generate exceptions because
the list iterator is not concern
Christian, Rami and Steven, thank you all for your help. It wasn't
meant to be a challenge, I knew it ought to be easily breakable. I'm
no hacker and it just helps to have some examples to better understand
the issue.
On Aug 20, 7:42 pm, Steven D'Aprano On a related topic, you should read this po
Sorry for digging this back from the grave.
I've had to chew on it for a little while.
On Aug 8, 1:40 am, Nobody wrote:
> If you want to support restricted execution within a language, it
> has to be built into the language from day one. Trying to bolt it > on later
> is a fool's errand.
Fair e
Thank you both for the explanation.
As a matter of fact RTFM doesn't -always- help. Sometimes I'm just
thick and I can read the manual 10 times and still not understand, as
it happened on this particular matter. Your contribution focused my
attention on the right bit of the manual which I somehow
Greetings everybody,
I don't quite understand why if I do this:
>>> d = {}
>>> exec("dir()", d)
1) d is no longer empty
2) the content of d now looks like __builtins__.__dict__ but isn't
quite it d == __builtins__.__dict__ returns false.
Can anybody shed some light?
Manu
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Greetings everybody,
I've been reading and mulling about python and security, specifically
in terms of executing code that may or may not be trustworthy. I
understand that libraries such as Rexec and Bastion are now deprecated
because they have known vulnerabilities that may be exploited to
circum
Christian, Robert, thank you both for the replies, much appreciated.
Manu
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Greetings,
I was looking in the archive of this newsgroup and I found this
snippet:
import imp
sourcecode = 'def foo(x): return 11*x'
mod = imp.new_module('foo')
exec sourcecode in mod.__dict__
mod.foo(16)
Together with similar and sometimes more complete snippets available
they show how a modul
Greetings,
today I did something like this:
class MyClass(object):
@classmethod
def myClassMethod(self):
print "ham"
myProperty = property(myClassMethod, None, None)
As many of you know this doesn't work and returns a TypeError: the
object passed to the property is not a
Thank you for the clarification Stefan, I understand.
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Hi everybody, I just tried the following:
>>> import xml.etree.ElementTree as etree
>>> e = etree.fromstring('>> xmlns:ans="anotherNamespace">>> ans:anotherAttr="2"/>')
>>> e.getchildren()[0].attrib
{'anAttr': '1', '{anotherNamespace}anotherAttr': '2'}
Notice the lack of namespace before the attr
Hello Paul, sorry for the long delay, I was trying to wrap my mind
around DOM and Events implementations...
On May 15, 7:08 pm, Paul Boddie wrote:
> Another implementation is probably a good thing, though, since I don't
> trust my own interpretation of the specifications. ;-)
Tell me about it. I
On May 19, 6:50 am, Stefan Behnel wrote:
> It's pretty easy to write unmaintainable code that uses the DOM API, though.
I'm finding that at my own expenses...
Why would anybody want to use the DOM? I suppose the main reason is
that it is one of the most reliable standards around. It might be mor
Hi everybody,
I'm looking at pxdom and in particular at its foundation class
DOMObject (source code at the end of the message). In it, the author
attempts to allow the establishment of readonly and read&write
attributes through the special methods __getattr__ and __setattr__. In
so doing is possib
Wow, thank you all. Lots of ideas and things to try! I wish I knew
which one is going to work best. The module I'm trying to (monkey!)
patch is pxdom, and as it is a bit long (5700 lines of code in one
file!) I'm not quite sure if the simplest patching method will work or
the more complicated o
On May 16, 8:17 pm, Arnaud Delobelle wrote:
> # Insert Wedge into each subclass of modfoo.Base
> for subclass in modfoo.Base.__subclasses__():
> if subclass.__module__ != 'modfoo': continue
> attrs = dict(item for item in subclass.__dict__.items()
> if item[0][:2] !=
Hi everybody,
let's assume I have a module with loads of classes inheriting from one
class, from the same module, i.e.:
## myFile.py
class SuperClass(object)
class SubClass1(SuperClass)
class SubClass2(SuperClass)
class SubClass3(SuperClass)
In a separate file I also have:
## myOtherFile.py
cla
Hi Paul, thank you for your swift reply!
On May 15, 3:42 pm, Paul Boddie wrote:
> Sure! Just keep your observations coming! I've made a very lazy
> attempt at DOM Events support in libxml2dom,
I just had a look at libxml2dom, in particular its events.py file.
Given that we are working from a sta
Hey Paul,
would you mind continuing this thread on Python + DOM? I'm trying to
implement a DOM Events-like set of classes and I could use another
brain that has some familiarity with the DOM to bounce ideas with. If
you are too busy never mind. Also, I thought of keeping the discussion
here rather
Thank you Paul for your reply!
I'm looking into pxdom right now and it looks very good and useful!
Thank you again!
Manu
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Hi everybody,
I just spent the past hour or so trying to have a better understanding
of how the various DOM-supporting libraries (xml.dom, xml.dom.minidom)
work. I've used etree and lxml successfully before but I wanted to
understand how close I can get to the W3C DOM standards. Ok, I think
more
Hi everybody,
I just finished unit-testing a couple of tightly related modules and
it's now time to test them together to a) check if they do talk to
each other in the ways they should, b) check how fast they can talk to
each other. The problem? Well, the problem is that potentially they
can have
On Apr 6, 12:44 pm, Piet van Oostrum wrote:
> 3. See also http://code.activestate.com/recipes/465156/
Thank you for the useful suggestions Piet. In particular I just had a
look at the SharedLock class provided through the link above and it
seems to fit the bill quite nicely. I'll give it a go!
T
On Apr 6, 7:49 am, "Diez B. Roggisch" wrote:
> The CPython-specific answer is that the GIL takes care of that for you
> right now anyway. So unless you plan for a distant future where some
> kind of swallows fly around that don't have a GIL, you are safe to
> simply read and write in threads witho
Hi everybody,
I'm having a threading-related design issue and I suspect it has a
name that I just don't know. Here's a description.
Let's assume a resource (i.e. a dictionary) that needs to be accessed
by multiple threads. A simple lock will do the job but in some
circumstances it will create an
Thank you both, Steven and Andrew, for the insightful explanation. I
shall keep it in mind when thinking about classes methods and
instances. Thank you again.
Manu
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Hi Everybody!
I just tried this:
>>> class C(object):
...def method(self):
...pass
...
>>> c = C()
>>> delattr(c, "method")
Traceback (most recent call last):
File "", line 1, in
AttributeError: 'C' object attribute 'method' is read-only
How come? Who told the class to make the m
On Mar 29, 12:28 am, Cousin Stanley wrote:
> You might try the pygtk mailing list available
> via the news.gmane.org server
Than you Stanley, much appreciated!
Manu
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Hi everybody,
Is GTK/PyGTK able to support application-based (rather than os-based)
skins? I.e. round corners, redesigned scrollbars, arbitrarily shaped
buttons and so on?
Manu
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Thank you all for the replies!
Manu
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Hi everybody,
I was unit testing some code today and I eventually stumbled on one of
those "is" issues quickly solved replacing the "is" with "==". Still,
I don't quite see the sense of why these two cases are different:
>>> def aFunction():
... pass
...
>>> f = aFunction
>>> f is aFunction
T
Thank you everybody for the informative replies.
I'll have to comb my code for all the instances of "item in sequence"
statement because I suspect some of them are as unsafe as my first
example. Oh well. One more lesson learned.
Thank you again.
Manu
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Sorry for the double-post, the first one was sent by mistake before
completion.
Hi everybody,
I just had a bit of a shiver for something I'm doing often in my code
but that might be based on a wrong assumption on my part. Take the
following code:
pattern = "aPattern"
compiledPatterns = [ ]
comp
Hi everybody,
I just had a bit of a shiver for something I'm doing often in my code
but that might be based on a wrong assumption on my part. Take the
following code:
pattern = "aPattern"
compiledPatterns = [ ]
compiledPatterns.append(re.compile(pattern))
if(re.compile(pattern) in compiledPatte
On Mar 6, 10:46 pm, "Martin v. Löwis" wrote:
> For b), the rationale is that such string literals
> in source code are often used to denote names, e.g.
> for getattr() calls and the like. As all names are interned,
> name-like strings get interned also.
Thank you Martin, and all others who have r
On 6 Mar, 19:46, Gary Herron wrote:
> It is an implementation choice (usually driven by efficiency considerations)
> to choose when two strings with the same value are stored in memory once or
> twice. In order for Python to recognize when a newly created string has the
> same value as an alre
Thank you everybody for the contributions and sorry if I reawoke the
recurring "is vs ==" issue. I -think- I understand how Python's
object model works, but clearly I'm still missing something. Let me
reiterate my original example without the distracting aspect of the
"==" comparisons and the four
Hi everybody,
while testing a module today I stumbled on something that I can work
around but I don't quite understand.
>>> a = "a"
>>> b = "a"
>>> a == b
True
>>> a is b
True
>>> c = "/a"
>>> d = "/a"
>>> c == d
True # all good so far
>>> c is d
False # ek!
Why c
Thank you both MRAB and Diez.
I think I'll stick to making copies inside a thread-protected section
unless I need to speed up things, at which point I might go for the
key exception path.
Thank you again!
Manu
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Hi everybody,
Assuming a snippet such as:
threadLocalData = threading.local()
threadLocalData.myDictionary = self.myDictionary
is it correct to say that threadLocalData.myDictionary is NOT a thread-
local -copy- of self.myDictionary but it's actually pointing to the
same object?
If that's the c
On Feb 4, 5:17 pm, MRAB wrote:
> You could use the lazy form "*?" which tries to match as little as
> possible, eg "\(\?P.*?\)" where the ".*?" matches:
> spam:(?P.*) ham:(?P.*)
> giving "spam:foo ham:(?P.*)".
A-ha! Of course! That makes perfect sense! Thank you! Problem solved!
Ciao!
Manu
--
Hi everybody,
I'm having a ball with the power of regular expression but I stumbled
on something I don't quite understand:
theOriginalString = "spam:(?P.*) ham:(?P.*)"
aReplacementPattern = "\(\?P.*\)"
aReplacementString= "foo"
re.sub(aReplacementPattern , aReplacementString, theOriginalString)
Sorry for the previous post, hit the Enter button by mistake... here's
the complete one:
Hi everybody!
I've written the code below to test the differences in performance
between compiled and non-compiled regular expression matching but I
don't quite understand the results. It appears that the com
Hi everybody!
I've written the code below to test the differences in performance
between compiled and non-compiled regular expression matching but I
don't quite understand the results. It appears that the performance
difference is only around 2%, even if I run the
import re
import
Thanks everybody and in particular Gabriel and Bryan for their
contributions to this thread. Very much useful information.
Manu
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On Dec 14, 2:40 am, Brian Allen Vanderburg II
wrote:
> But what I think it means is that during the listen for an incoming
> connection on the listening socket, if multiple connection attempts are
> coming in at one time it can keep a backlog of up to 5 of these
> connection attempts for that indi
On Dec 14, 4:10 am, "Gabriel Genellina"
wrote:
> daemon became a property in Python 2.6; setDaemon was the only way to set
> it in previous versions.
I thought that might be the case! The documentation is a bit vague:
http://docs.python.org/library/threading.html?highlight=threading#threading.Th
On Dec 14, 4:48 am, "Gabriel Genellina"
wrote:
> - you have to close server.stdin when you don't have more data to send.
> The server will see an end-of-file and knows it has to exit the loop.
> Same thing on the client side.
Hi Gabriel, thanks for modifying the code to make it work. I've just
tr
On Dec 13, 11:13 pm, Bryan Olson wrote:
> Software firewalls will often simply refuse incoming connections. The
> basic protection of the garden-variety home router comes from "network
> address translation" (NAT), in which case TCP connections initiated from
> the inside will generally work, rega
Hi everybody,
I'm trying to replicate the positive results of the Client/Server
scripts from the thread "Bidirectional Networking", but this time
using a Process/SubProcess architecture.
The SubProcess, acting as a server, is working just fine. But the
Process executing the SubProcess, the client
Hey Bryan, thank you for your reply!
On Dec 13, 3:51 am, Bryan Olson wrote:
> > Is it possible then to establish both a server and a client in the
> > same application?
>
> Possible, and not all that hard to program, but there's a gotcha.
> Firewalls, including home routers and software firewalls
On Dec 13, 12:08 am, "James Mills"
wrote:
> Just as a matter of completeness for my own suggestion, here
> is my implementation of your code (using circuits):
It's longer! But I bet is a little bit more resilient against all
sorts of problems that arise while using network connections.
Well, tha
On Dec 12, 9:04 pm, "Gabriel Genellina"
wrote:
> If you're using 2.5 or older, override serve_forever:
>
> def serve_forever(self):
> while not getattr(self, 'quit', False):
> self.handle_request()
>
> and set the server 'quit' attribute to True in response to some comma
Thank you both for the suggestions! Eventually I tried with threading
as illustrated in the code below.
And it works pretty well! The only problem I'm having with it is that
as the server is a daemon the program should end when the client
thread cease to be alive. But it doesn't seem to work that w
Hi everybody! A networking question!
I've been looking at and tinkering a little with the various
networking modules in python. The examples are pretty clear and a
module such as the SimpleXMLRPCServer is actually simple!
All the examples though are based on a client interrogating a server,
with
On Dec 11, 11:46 pm, greg wrote:
> Emanuele D'Arrigo wrote:
> > -IF- the application was single-user yes, it wouldn't be a big deal.
> > But as it is potentially multi-user, I don't want one party to corrupt
> > the application for everybody else.
>
>
On Dec 11, 7:48 pm, Bruno Desthuilliers
wrote:
> > or to provide read-only
> > access. I.e. right now I'm working on the graphical client which
> > potentially could be rewritten entirely by the users. It is necessary
> > and perfectly reasonable for the client module to access some of the
> > obj
Thank you all for the confirmation and the suggestions (including the
tangential ones: I didn't know one could remove your his own posts!).
As much as I really like Python (which I've been using full-time only
for the past two months) I really wish it did have regular private/
protected/public met
Sorry if I'm a bit thick here...
can any of the esteemed participant in this noble newsgroup confirm
that is not possible to prevent a python module's code from executing
the methods of another module?
I.e. if I have a class with two methods, doSomethingSafe() and
doSomethingDangerous(), is there
On Nov 29, 5:21 am, Steven D'Aprano <[EMAIL PROTECTED]
cybersource.com.au> wrote:
> This is a side-effect of name-mangling. Double-underscore names are only
> mangled when they are referred to directly as attributes, not when they
> are passed to setattr, getattr etc. Those functions don't do any n
On Nov 29, 12:35 am, Fuzzyman <[EMAIL PROTECTED]> wrote:
> Your experiences are one of the reasons that writing the tests *first*
> can be so helpful. You think about the *behaviour* you want from your
> units and you test for that behaviour - *then* you write the code
> until the tests pass.
Than
Hi everybody,
I'm having a naming/scoping/mangling issue. I have a class like this:
class MyClass(object):
__init__(self):
self.__myAttribute = None
def myMethod(self, aValue):
attributeName = "__myAttribute"
setattr(self, attributeName, aValue)
It all looks
Thank you to everybody who has replied about the original problem. I
eventually refactored the whole (monster) method over various smaller
and simpler ones and I'm now testing each individually. Things have
gotten much more tractable. =)
Thank you for nudging me in the right direction! =)
Manu
--
On Nov 27, 5:00 am, Steven D'Aprano
<[EMAIL PROTECTED]> wrote:
> Refactor until your code is simple enough to unit-test effectively, then
> unit-test effectively.
Ok, I've taken this wise suggestion on board and of course I found
immediately ways to improve the method. -However- this generates
ano
On Nov 27, 5:00 am, Steven D'Aprano
<[EMAIL PROTECTED]> wrote:
> Refactor until your code is simple enough to unit-test effectively, then
> unit-test effectively.
I suspect you are right...
Ok, thank you!
Manu
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Hi everybody,
another question on unit testing, admittedly not necessarily a python-
specific one...
I have a class method about 60 lines long (*) and due to some 9 non-
trivial IFs statements (3 and 2 of which nested) the number of
possible paths the program flow can take is uncomfortably large,
Thanks to those who replied and sorry for not having replied sooner.
Ok, got the message: chroot jail. I understand chroot is available for
unix-like OS as a kernel-provided facility. If I was developing for,
say, Linux or maybe even MacOSX, it might even be easy. My target OS
however are XP and V
Thank you all for the insightful replies! Much appreciated!
Manu
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I'm pondering on what is a bit of a philosophical dilemma.
When should I throw an exception and when should I not?
Suppose I have myFunc1() calling myFunc2() which in turn calls myFunc3
().
Suppose myFunc3() has detected a problem. What should it do?
Throw an exception, forcing myFunc2() to handl
On Nov 1, 12:44 am, Lawrence D'Oliveiro wrote:
> I think the most reliable solution is to take advantage of a level in the
> system that already has to provide protection against malicious code: use a
> chroot jail. Or run a complete virtualized machine with its own OS
> installation. Then the code
Ahh... before you guys reply: I found the way.
Between you James sounding the horn of alarm and you Rafe pointing me
in the right direction I sorted it out. Eventually I didn't end up
using getAttr but looking into it I learned the difference between
myResult = instance.method()
and
myMethod =
On Oct 31, 4:38 am, Rafe <[EMAIL PROTECTED]> wrote:
> If you are just looking to execute an attribute (be it a property,
> module-level function, instance or class method, or anything else
> which is an attribute of an object), just use getattr().
I must check this out. My understanding is that ge
On Oct 31, 3:56 am, "James Mills" <[EMAIL PROTECTED]>
wrote:
> Good lord man, what are you trying to solve ?
> Describe your "actual problem" you're attempting
> to solve... This looks really really ugly and I would
> advise against any solution that relies on exec()
I knew I was going to get some
On Oct 30, 8:50 pm, Aaron Brady <[EMAIL PROTECTED]> wrote:
> Otherwise, you might be able to remove access to it by modifying
> however it is the 'cust' list is obtained. Perhaps you can use the
> technique that's used to change the value of integers. Keep us
> posted. Does this give you any ide
Hi everybody!
I'm trying to do something in a way that is probably not particularly
wise but at this point I don't know any better, so bear with me.
Suppose in main.py I have the following statements:
myObject = MyObject()
execThis("myObject.myCommand()")
Now suppose the method
def execThis(aC
I noticed that this issue has been discussed in this newsgroup
periodically over the years and I seem to understand that -
comprehensive- safe/restricted execution of untrusted code in python
is currently quite hard to achieve.
What if the safety requirements are a little relaxed though? All I'd
w
Thank you all for the very instructive replies! Much appreciated!
By the sound of it I just have to relax a little and acquire a little
bit more experience on the matter as I go along. =)
Thank you again!
Manu
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Hi everybody,
I'm just having a go with Unit Testing for the first time and my
feeling about it in short is: Neat!
I'm a bit worried about the time it's taking me to develop the tests
but after only a day or so I'm already much faster than when I started
with it and the code is already much impro
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