EPD (Enthought Python Distribution) 4.0.300 Beta 3 available
Hello, We've recently posted the third beta release of EPD (the Enthought Python Distribution) with Python 2.5 version 4.0.300. You may download the beta from here: http://www.enthought.com/products/epdbeta.php Please help us test it out and provide feedback on the EPD Trac instance: https://svn.enthought.com/epd You can check out the release notes here: http://www.enthought.com/products/epdbetareleasenotes.php About EPD - The Enthought Python Distribution (EPD) is a kitchen-sink-included distribution of the Python™ Programming Language, including over 60 additional tools and libraries. The EPD bundle includes NumPy, SciPy, IPython, 2D and 3D visualization, database adapters, and a lot of other tools right out of the box. http://www.enthought.com/products/epd.php It is currently available as a single-click installer for Windows XP (x86), Mac OS X (a universal binary for OS X 10.4 and above), and RedHat 3 and 4 (x86 and amd64). EPD is free for academic use. An annual subscription and installation support are available for individual commercial use. An enterprise subscription with support for particular deployment environments is also available for commercial purchase. The beta versions of EPD are available for indefinite free trial. -- Dave -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
ANN: TakeNote 0.4.2 - Note taking and organization
TakeNote 0.4.2 - Note taking and organization In this release: * faster loading * bullet point lists * more customization * bug fixes TakeNote is a simple cross-platform note taking program implemented in Python. I have been using it for my research and class notes, but it should be applicable to many note taking situations. Although this is my first release, it has most of the basic features needed for effective notes. TakeNote is ideal for storing your class notes, TODO lists, research notes, journal entries, paper outlines, etc in a simple notebook hierarchy with rich-text formatting, images, and more. Using full-text search, you can retrieve any note for later reference. TakeNote is designed to be cross-platform (runs on Windows, Linux, and MacOS X, implemented in Python and PyGTK) and stores your notes in simple and easy to manipulate file formats (HTML and XML). Archiving and transferring your notes is as easy as zipping or copying a folder. TakeNote is licensed under GPL. TakeNote 0.4.2 is has the following features: * Rich-text formatting * Bullet point lists * Hierarchical organization for notes * Full-text search * Inline images * Integrated screenshot * Spell checking (via gtkspell) * Auto-saving * Built-in backup and restore (archive to zip files) * Cross-platform (Linux, Windows, MacOS X) Web site and download: http://rasm.ods.org/takenote Matt Rasmussen -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
Re: what does ` ` do in ' '.join([`x * x` for x in range(1, 6)])?
process wrote: ' '.join([`x * x` for x in range(1, 6)]) exactly what does this symbol do and what does it stand for? Which symbol, the '*' ??? Are you kidding? -- http://mail.python.org/mailman/listinfo/python-list
Re: what does ` ` do in ' '.join([`x * x` for x in range(1, 6)])?
process wrote: ' '.join([`x * x` for x in range(1, 6)]) exactly what does this symbol do and what does it stand for? Ah, just spotted the backticks - they just return whatever's inside them as a string. -- http://mail.python.org/mailman/listinfo/python-list
Re: Eggs, VirtualEnv, and Apt - best practices?
Diez B. Roggisch wrote: that is a very valid point, but it seemed that Scott has homogeneous environment: Debian/Ubuntu so my post was relative to the original request. I agree that when you throw Windows/MacOS into the mix things become interesting. But then it's better when your developers develop on server/platform they are going to be using, using same stack they going to face in production etc. It all depends on requirements and current practices in company. Well, you certainly want a desktop-orientied Linux for users, so you chose ubuntu - but then on the server you go with a more stable debian system. Even though the both have the same technical and even package management-base, they are still incompatible wrt to package versions for python. And other constraints such as Photoshop not being available for Linux can complicate things further. Photoshop for Windows runs fine under Wine, or at least it does on my Ubuntu box, just make sure you install the windows core fonts. I don't think many people realise how good Wine is these days, maybe because it was so useless for so long, it's pretty good right now. Also there's 'crossover' if you need even better out of the box Win32 binary compatibility. Roger. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to get the filename in the right case ?
Steven D'Aprano wrote: On Fri, 26 Sep 2008 01:46:15 +0200, Stef Mientki wrote: Secondly thoughtless copying of current behavior, doesn't bring any progress, and I think that's one of the reasons why we're still burdened by inventions done 20 years ago, e.g. do you want to save your changes ?. I click No about 50% of the time, and Yes Of Course You Stupid Machine the other 50% of the time. Until they have a computer capable of reading my mind, I'm curious what alternative you'd suggest. Agreed, it's pretty handy, especially since every program and its dog decided to sprout tabs everywhere. Roger. -- http://mail.python.org/mailman/listinfo/python-list
Re: What do you call a class not intended to be instantiated
On Fri, 26 Sep 2008 22:15:43 -0700, Aahz wrote: In article [EMAIL PROTECTED], Steven D'Aprano [EMAIL PROTECTED] wrote: On Thu, 25 Sep 2008 21:17:14 -0700, Aahz wrote: Seems to me that if all the module is used for is to store state, you're wasting a file on disk. I personally prefer to use a class singleton. I don't recognise the term class singleton. Can you explain please? How is it different from an ordinary singleton? An ordinary singleton is instantiating the class multiple times yet returning the same instance object; a class singleton is simply using the class directly (like a module). Amazing. That's *exactly* what I was thinking of when I first asked my question. Since I now no longer think I need such a beast, this is just academic curiosity, but given a class singleton, I'd like to be able to call it as if it were a function. Normally calling a class object returns an instance -- I wish to return something else. Is that just a matter of overriding __new__? This seems to works: class ClassSingleton(object): ... thing = (0, 1, 2) ... def __new__(cls, *args): ... return len(args+cls.thing) ... ClassSingleton(1, 2, 4, 8, 16) 8 Is it really that easy? -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: how to search multiple textfiles ? (Python is slow ?)
Hi !
Thanks for return.
Some infos: from a long time, I found that it's often more fast to use
windows's command, instead of develop in high level language (and also,
low level...)
FINDSTR is fast. OK. But internal commands are more fast. Example : DIR
(with all his options)
And it's faster to read the result via a Pipe.
Thus, I use frequently this sort of function:
import os
def cmdone(repstart, commande, moderetour=LIST):
os.chdir(repstart)
sret=''.join(os.popen(commande))
if moderetour.upper() == STR:
return sret
else:
return sret.split('\n')
print cmdone('D:\\dev\\python','findstr /N /I ponx *.py','STR')
print
print cmdone('D:\\dev\\python','dir *.jpg /B')
Sorry for my bad english, and have a good day...
--
Michel Claveau
--
http://mail.python.org/mailman/listinfo/python-list
Negative block sizes with file-like objects
I have a proxy class that wraps an arbitrary file-like object fp and reads blocks of data from it. Is it safe to assume that fp.read(-1) will read until EOF? I know that's true for file.read() and StringIO.read(), but is it a reasonable assumption to make for arbitrary file-like objects? To put it in more concrete terms, I have a class like this: class C(object): # Much simplified version. def __init__(self, fp): self.fp = fp def read(self, size=-1): return self.fp.read(size) Should I re-write the read() method like this? def read(self, size=-1): if size 0: return self.fp.read() else: return self.fp.read(size) -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Are spams on comp.lang.python a major nuisance?
On 2008-09-26, nntpman68 [EMAIL PROTECTED] wrote: - I'm annoyed by any spam. It's tough to find good rules, but the incoming spams that I see currently on comp.lang.python have certain criteas. - most email addresses from gmail. ...snip rest of good filter criteria... Killing all messages with googlegroups in the messageid will get rid of a vast majority of the spam. Killing anything with a gmail.com email address will end up killing more legitimate posters. -- email: echo [EMAIL PROTECTED] | sed 's/s/o/g' | rot13 All posts from Google Groups are auto-killed. -- http://mail.python.org/mailman/listinfo/python-list
Re: Negative block sizes with file-like objects
Steven D'Aprano wrote: I have a proxy class that wraps an arbitrary file-like object fp and reads blocks of data from it. Is it safe to assume that fp.read(-1) will read until EOF? I know that's true for file.read() and StringIO.read(), but is it a reasonable assumption to make for arbitrary file-like objects? To put it in more concrete terms, I have a class like this: class C(object): # Much simplified version. def __init__(self, fp): self.fp = fp def read(self, size=-1): return self.fp.read(size) Should I re-write the read() method like this? def read(self, size=-1): if size 0: return self.fp.read() else: return self.fp.read(size) Grepping through the python source shows that both -1 and None are used as the default size. # python2.5.2 import tarfile open(sample, w).write(contents-of-sample) t = tarfile.open(sample.tar, w) t.add(sample) t.close() t = tarfile.open(sample.tar) t.extractfile(sample).read() 'contents-of-sample' t.extractfile(sample).read(-1)[:50] 'contents-of-sample\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' So you may fare better with the rewrite. But even that may fail: http://docs.python.org/lib/bltin-file-objects.html#l2h-295 read( [size]) [...] If the size argument is negative or omitted, read all data until EOF is reached. [...] Also note that when in non-blocking mode, less data than what was requested may be returned, even if no size parameter was given. Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: Are spams on comp.lang.python a major nuisance?
2008/9/26 nntpman68 [EMAIL PROTECTED]: It's tough to find good rules, but the incoming spams that I see currently on comp.lang.python have certain criteas. - most email addresses from gmail. - all never posted before and then they have multiple posts within a few minutes / seconds - the posts always contain one or more urls ( mostly cryptic names ) - they always start a thread but never reply to one - the post doesn't contain python code or anything which looks only vaguely like source code - never mentions the word python - the amount of sexual or financial vocabulary exceeds classical python posts I hope that the spammers don't read the list! -- Dotan Cohen http://what-is-what.com http://gibberish.co.il א-ב-ג-ד-ה-ו-ז-ח-ט-י-ך-כ-ל-ם-מ-ן-נ-ס-ע-ף-פ-ץ-צ-ק-ר-ש-ת ä-ö-ü-ß-Ä-Ö-Ü -- http://mail.python.org/mailman/listinfo/python-list
python for *nix system admins
Hi All, I'm new to this list and hoping that this is not off-topic. If it is, please point me in the right direction. I seem to recollect a python module or library for *nix sysadmins, but I can't for the life of me find it again. The module (or library) somehow added unix command capabilities to the python language. It seemed like a lesser known, perhaps new, python library or module. Any input or ideas appreciated /Lars Stavholm -- http://mail.python.org/mailman/listinfo/python-list
Re: What do you call a class not intended to be instantiated
Steven D'Aprano [EMAIL PROTECTED] writes: On Fri, 26 Sep 2008 22:15:43 -0700, Aahz wrote: An ordinary singleton is instantiating the class multiple times yet returning the same instance object; a class singleton is simply using the class directly (like a module). Where is this class singleton terminology from? It seems redundant to me. It also doesn't seem to have anything to do with what singleton means as a pattern; using a class is simply using a class. Since I now no longer think I need such a beast That's a relief :-) I'd like to be able to call [a class] as if it were a function. Normally calling a class object returns an instance -- I wish to return something else. In that case, you *don't* want a class at all; the entire point of a class is to define behaviour for instances. Instead, you want to define a class whose *instances* are callable, by defining the '__call__' method to do whatever it is you want. This seems to works: class ClassSingleton(object): ... thing = (0, 1, 2) ... def __new__(cls, *args): ... return len(args+cls.thing) ... ClassSingleton(1, 2, 4, 8, 16) 8 Horribly obfuscatory. Calling a class should return a new instance of the class or something like it. Instead, define it so the user instantiates the class by calling the class, and *then* calls that non-class object, and so shouldn't expect to get a new instance back: class CallableAppendor(object): ... thing = (0, 1, 2) ... def __call__(self, *args): ... return len(args + self.thing) ... appendor = CallableAppendor() appendor(1, 2, 4, 8, 16) 8 -- \ “Pleasure's a sin, and sometimes sin's a pleasure.” —“Lord” | `\ George Gordon Noel Byron, _Don Juan_ | _o__) | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: python for *nix system admins
import os HTH KM ~~ On Sat, Sep 27, 2008 at 1:35 PM, Lars Stavholm [EMAIL PROTECTED] wrote: Hi All, I'm new to this list and hoping that this is not off-topic. If it is, please point me in the right direction. I seem to recollect a python module or library for *nix sysadmins, but I can't for the life of me find it again. The module (or library) somehow added unix command capabilities to the python language. It seemed like a lesser known, perhaps new, python library or module. Any input or ideas appreciated /Lars Stavholm -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Running IDLE on 3.0rc1
Allan wrote: Terry Reedy [EMAIL PROTECTED] writes: I have not seen this posted, so... To run IDLE with Python3.0rc1, edit Python30/Libs/idlelib/run.py, and change set_daemon(True) to daemon = True and save. (This is about line 75, and the only appearance of 'daemon'.) Otherwise, you get error message about not starting a subprocess. Is this related to the tip at the end of the built-in help file in IDLE regarding the `-n' command option? No, the above is a bug fix that did not make it into rc1 but has now been committed. It arose because the interface of a class in one of the modules was changed from .set_var(val) to .var = val and the need to change IDLE was not caught. I imagine that checking that IDLE runs in not in the test suite. -- http://mail.python.org/mailman/listinfo/python-list
Re: python for *nix system admins
km wrote: import os Thanks, but I'm aware of the standard libraries like os, sys, commands, and whatnot. I'm looking for a non-standard library that acts like a wrapper for the unix commands. I have seen it, I just can't find it again. /L On Sat, Sep 27, 2008 at 1:35 PM, Lars Stavholm [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] wrote: Hi All, I'm new to this list and hoping that this is not off-topic. If it is, please point me in the right direction. I seem to recollect a python module or library for *nix sysadmins, but I can't for the life of me find it again. The module (or library) somehow added unix command capabilities to the python language. It seemed like a lesser known, perhaps new, python library or module. Any input or ideas appreciated /Lars Stavholm -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Using the 'with' statement with cStringIO objects
I've been experimenting with the 'with' statement (in __future__), and so far I like it. However, I can't get it to work with a cStringIO object. Here's a minimum working example: ### from __future__ import with_statement import cStringIO teststring='this is a test' with cStringIO.StringIO(teststring) as testfile: pass ### I get the following error message: Traceback (most recent call last): File testfile.py, line 6, in module with cStringIO.StringIO(teststring) as testfile: AttributeError: 'cStringIO.StringI' object has no attribute '__exit__' So, I'm guessing you can't use the 'with' statement with cStringIO objects? Is this a bug, or do I need to use the 'with' statement differently to get this to work? Thanks, peppergrower -- http://mail.python.org/mailman/listinfo/python-list
Re: python for *nix system admins
Lars Stavholm [EMAIL PROTECTED] writes: The module (or library) somehow added unix command capabilities to the python language. It seemed like a lesser known, perhaps new, python library or module. Which particular Unix commands? Perhaps you're thinking of the 'shutil' module URL:http://www.python.org/doc/lib/module-shutil, which wraps a few filesystem manipulation commands. -- \ “Of all classes the rich are the most noticed and the least | `\ studied.” —John Kenneth Galbraith, _The Age of Uncertainty_, | _o__) 1977 | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: What do you call a class not intended to be instantiated
On Sat, 27 Sep 2008 18:20:17 +1000, Ben Finney wrote: Steven D'Aprano [EMAIL PROTECTED] writes: On Fri, 26 Sep 2008 22:15:43 -0700, Aahz wrote: An ordinary singleton is instantiating the class multiple times yet returning the same instance object; a class singleton is simply using the class directly (like a module). Where is this class singleton terminology from? I don't know. Googling on it brings up an awful lot of C++ and Java source code for regular Singletons. Perhaps Aahz can shed some light on it? It seems redundant to me. It also doesn't seem to have anything to do with what singleton means as a pattern; using a class is simply using a class. I don't see why this idiom causes such conceptual difficulty. There are classes with many instances; there are classes with a single instance (Singleton). Why should't there be classes with no instances? A class is just an object. If you find yourself caring whether a particular object is a class, an instance or a function, then you have to ask yourself why you are worrying about the implementation details. Of course as the library writer, it's your job to worry about the implementation details, but ideally the library user shouldn't have to. Since I now no longer think I need such a beast That's a relief :-) I'd like to be able to call [a class] as if it were a function. Normally calling a class object returns an instance -- I wish to return something else. In that case, you *don't* want a class at all; the entire point of a class is to define behaviour for instances. Classes encapsulate state + behaviour in one package, and they allow inheritance. That's a lot more than merely defining behaviour of instances. Instances in turn have the additional capability of being able to over-ride the class' state and behaviour: class C(object): x = 'spam' c = C() c.x = 'ham' # doesn't touch C.x If your instance doesn't do something the class can't do on it's own, why bother with the instance? Instead, you want to define a class whose *instances* are callable, by defining the '__call__' method to do whatever it is you want. Most of the time, sure. This seems to works: class ClassSingleton(object): ... thing = (0, 1, 2) ... def __new__(cls, *args): ... return len(args+cls.thing) ... ClassSingleton(1, 2, 4, 8, 16) 8 Horribly obfuscatory. Calling a class should return a new instance of the class or something like it. Apart from the name, which I dislike, what is obfuscatory about it? Haven't you ever used factory functions or class builders? It's the same principle. Why do you care that ClassSingleton is a class instead of a function? I'm certainly not saying that we should use classes this way all the time, but the capability is there, and apparently not by accident. Guido wrote: __new__ must return an object. There's nothing that requires that it return a new object that is an instance of its class argument, although that is the convention. If you return an existing object of your class or a subclass, the constructor call will still call its __init__ method. If you return an object of a different class, its __init__ method will not be called. http://www.python.org/download/releases/2.2.3/descrintro/ Instead, define it so the user instantiates the class by calling the class, and *then* calls that non-class object, and so shouldn't expect to get a new instance back: class CallableAppendor(object): ... thing = (0, 1, 2) ... def __call__(self, *args): ... return len(args + self.thing) ... appendor = CallableAppendor() appendor(1, 2, 4, 8, 16) 8 That's the right solution when the instance is able to override the state and/or behaviour of the class. Most uses of classes are like that: class Spam(object): def __init__(self, n): self.n = n def sing(self): return spam *self.n + glorious SPAM!!! Because the behaviour (method 'sing') depends on state which is specific to the instance (attribute 'n'), it is right and proper to instantiate the class. The class 'Spam' is a constructor for instances, and the instances do all the work. But my earlier example is not the same. In the example I gave, neither the behaviour nor the state depend on the instance: everything is specified in the class. Ben's variant behaves differently: the caller might override appendor.thing by hand. That is Ben's choice, of course, and it may be a valid one for many applications, but it's displaying different behaviour to my example. In my example, the instance doesn't matter. I could write it like this: class CallableAppendor(object): ... thing = (0, 1, 2) ... @classmethod ... def __call__(cls, *args): ... return len(args + cls.thing) ... appendor = CallableAppendor() appendor.thing = (1, 2, 3, 4, 5, 6, 7, 8) appendor(1, 2, 4, 8, 16) 8
Re: Using the 'with' statement with cStringIO objects
peppergrower wrote: teststring='this is a test' with cStringIO.StringIO(teststring) as testfile: pass umm. what exactly do you expect that code to do? /F -- http://mail.python.org/mailman/listinfo/python-list
Re: How to read a jpg bytearray from a Flash AS3 file
[EMAIL PROTECTED] wrote: I'm trying to save an image from a Flash AS3 to my server as a jpg file. I found some PHP code to do this, but I want to do this in Python. I'm not quite sure how to convert the following code to Python. It's mainly the $GLOBALS[HTTP_RAW_POST_DATA] part I don't know how to convert. depends on what framework you're using. if you're using plain CGI, you should be able to read the posted data from sys.stdin: import sys im = sys.stdin.read() f = open(name, 'wb') f.write(jpg) f.close() to make your code a bit more robust, you may want to check the content-length before doing the read, e.g. import os if os.environ.get(REQUEST_METHOD) != POST: ... report invalid request ... bytes = int(os.environ.get(CONTENT_LENGTH, 0)) if bytes MAX_REQUEST_SIZE: ... report request too large ... im = sys.stdin.read(bytes) to deal with query parameters etc, see http://docs.python.org/lib/module-cgi.html /F -- http://mail.python.org/mailman/listinfo/python-list
Re: what does ` ` do in ' '.join([`x * x` for x in range(1, 6)])?
On Sep 27, 3:58 pm, r0g [EMAIL PROTECTED] wrote: Ah, just spotted the backticks - they just return whatever's inside them as a string. No, they return the repr() of the object inside. The output of __repr__ -has- to be a string, but typecasting into string isn't the intention of repr() (or the ` operator). -- http://mail.python.org/mailman/listinfo/python-list
Re: How to get the filename in the right case ?
Stef Mientki wrote: I don't think your suggestion is a good one. If a filename has uppercase characters in it, the END-USER has done that for some kind of reason. I explain how pdb works and show you how to solve the specific comparison problem you mentioned in your post, and you start ranting because it doesn't solve all your problems? what's wrong with you? /F -- http://mail.python.org/mailman/listinfo/python-list
Re: How to get the filename in the right case ?
Steven D'Aprano wrote: On Fri, 26 Sep 2008 01:46:15 +0200, Stef Mientki wrote: Secondly thoughtless copying of current behavior, doesn't bring any progress, and I think that's one of the reasons why we're still burdened by inventions done 20 years ago, e.g. do you want to save your changes ?. I click No about 50% of the time, and Yes Of Course You Stupid Machine the other 50% of the time. Until they have a computer capable of reading my mind, I'm curious what alternative you'd suggest. It's well known that just using Yes and No in a dialog box is very, very poor UI design. In many cases it leads to confusion. Especially when the dialog box has both a statement and a question, which many do. The correct and proper way is to use only verbs in the buttons. For example instead of yes/no to the question of saving work before exiting, you'd use save and don't save. That's extremely clear even if you don't quite understand the statement and question the dialog is asking. Certainly the human-interface guidelines on the more sane systems out there (OS X, Gnome) disallow the use of yes/no buttons in dialog boxes. -- http://mail.python.org/mailman/listinfo/python-list
Re: Are spams on comp.lang.python a major nuisance?
On Sep 26, 1:04 pm, Aaron \Castironpi\ Brady [EMAIL PROTECTED] wrote: On Sep 26, 11:43 am, Tim Rowe [EMAIL PROTECTED] wrote: 2008/9/26 Steven D'Aprano [EMAIL PROTECTED]: I don't have any objective numbers, but subjectively it seems to me that the number of spams is significantly higher, but not so high as to be a major nuisance. I consider *any* spam to be a major nuisance, but I don't see them as being the fault of python-list which seems to do a pretty good job of blocking them I think in June and July they were selling watches a lot which I haven't noticed recently. Gucci 104 G-Bandeau Watches - Gucci Watches Discount Rolex Oyster Perpetual Lady Datejust Pearlmaster 18kt Yellow Gold Diamond Ladies Watch 80318C Cartier Must 21 Watches - Cartier Watches Discount I speak too soon. -- http://mail.python.org/mailman/listinfo/python-list
Re: Are spams on comp.lang.python a major nuisance?
2008/9/27 Aaron Castironpi Brady [EMAIL PROTECTED]: I think in June and July they were selling watches a lot which I haven't noticed recently. Gucci 104 G-Bandeau Watches - Gucci Watches Discount Rolex Oyster Perpetual Lady Datejust Pearlmaster 18kt Yellow Gold Diamond Ladies Watch 80318C Cartier Must 21 Watches - Cartier Watches Discount I speak too soon. If we start blocking users who have no previous posts and then post many new messages at once, then we wll just push the spammers to forge active list users and reply to threads. That would be a worse situation then we are in now. I say leave well enough alone. Read about the Brain Blood Barrier (http://en.wikipedia.org/wiki/Brain_Blood_Barrier) for an example in nature where although a method to stop an attacker exists, it is not overused to prevent the attacker from becoming more powerful. -- Dotan Cohen http://what-is-what.com http://gibberish.co.il א-ב-ג-ד-ה-ו-ז-ח-ט-י-ך-כ-ל-ם-מ-ן-נ-ס-ע-ף-פ-ץ-צ-ק-ר-ש-ת ä-ö-ü-ß-Ä-Ö-Ü -- http://mail.python.org/mailman/listinfo/python-list
Regular expression help: unable to search ' # ' character in the file
Hi, Can some help me with the regular expression. I'm looking to search # character in my file? My file has contents: ### Hello World ### length = 10 breadth = 20 height = 30 ### ### Hello World ### length = 20 breadth = 30 height = 40 ### I used the following search : import re fd = open(file, 'r') line = fd.readline pat1 = re.compile(\#*) while(line): mat1 = pat1.search(line) if mat1: print line line = fd.readline() But the above prints the whole file instead of the hash lines only. Please help Regards, Rajat -- http://mail.python.org/mailman/listinfo/python-list
Re: what does ` ` do in ' '.join([`x * x` for x in range(1, 6)])?
In article [EMAIL PROTECTED], alex23 [EMAIL PROTECTED] wrote: ' '.join((str(x * x) for x in range(1,6))) Aren't the outer set of parens redundant? This works just as well: ' '.join(str(x * x) for x in range(1,6)) -- http://mail.python.org/mailman/listinfo/python-list
Re: What do you call a class not intended to be instantiated
On Sep 27, 5:33 am, Steven D'Aprano [EMAIL PROTECTED] cybersource.com.au wrote: On Sat, 27 Sep 2008 18:20:17 +1000, Ben Finney wrote: Steven D'Aprano [EMAIL PROTECTED] writes: On Fri, 26 Sep 2008 22:15:43 -0700, Aahz wrote: An ordinary singleton is instantiating the class multiple times yet returning the same instance object; a class singleton is simply using the class directly (like a module). Where is this class singleton terminology from? I don't know. Googling on it brings up an awful lot of C++ and Java source code for regular Singletons. Perhaps Aahz can shed some light on it? [snip] In my example, the instance doesn't matter. I could write it like this: class CallableAppendor(object): ... thing = (0, 1, 2) ... @classmethod ... def __call__(cls, *args): ... return len(args + cls.thing) ... appendor = CallableAppendor() appendor.thing = (1, 2, 3, 4, 5, 6, 7, 8) appendor(1, 2, 4, 8, 16) 8 CallableAppendor.__call__(1,2,4,8,16) 8 but what's the purpose of instantiating the class? I've used them (class singletons, adopting the term) as a Globals namespace, but only to the end of tidying. It makes it easy to reassign immutables. It is too bad 'CallableAppendor.__call__(1,2,4,8,16)' doesn't work as expected. That is, 'CallableAppendor(1,2,4,8,16)' dosen't call '__call__'. I have a workaround, which may be just what you're looking for. class A(type): ... def __call__( self, *ar ): ... print 'call', self, ar ... class B(object): ... __metaclass__= A ... B(3) call class '__main__.B' (3,) Overriding the __call__ method of 'type' has the effect of giving you a static __call__ method on a class-- a method which doesn't need an instance to call. Your behavior may be counterintuitive though, to someone who wants to instantiate 'B', in this case, and proceed like a normal object. That is, they want to call a generic class and use it, and also expect instances of B to behave as B. You can't have both, so either return B from B.__new__, or, to instantiate B, take the long way and call B.__new__ directly. B.__new__(B) __main__.B object at 0x009FDB70 Has anyone stepped through the C code to find out when the decision is made to call which function, B.__new__ or A.__call__, when B is called? I'm happy that overriding type.__call__ produced the intended results; it's always nice when things go right. -- http://mail.python.org/mailman/listinfo/python-list
Re: Build-in 'repr' function (was: what does ` ` do in ' '.join([`x * x` for x in range(1, 6)])?)
On Sep 27, 4:16 am, Ben Finney [EMAIL PROTECTED] wrote: process [EMAIL PROTECTED] writes: ' '.join([`x * x` for x in range(1, 6)]) exactly what does this symbol do and what does it stand for? It's an obsolete, deprecated syntactic sugar for (what is now implemented as) the built-in 'repr' function. Instead, write the above as: ' '.join([repr(x * x) for x in range(1, 6)]) I'd classify it as one of Guido's mistakes! :-) -- http://mail.python.org/mailman/listinfo/python-list
Re: Regular expression help: unable to search ' # ' character in the file
[EMAIL PROTECTED] wrote: import re fd = open(file, 'r') line = fd.readline pat1 = re.compile(\#*) while(line): mat1 = pat1.search(line) if mat1: print line line = fd.readline() I strongly doubt that this is the code you used. But the above prints the whole file instead of the hash lines only. * means zero or more matches. all lines is a file contain zero or more # characters. but using a RE is overkill in this case, of course. to check for a character or substring, use the in operator: for line in open(file): if # in line: print line /F -- http://mail.python.org/mailman/listinfo/python-list
Re: python for *nix system admins
On Sat, 27 Sep 2008 10:05:01 +0200, Lars Stavholm wrote: Hi All, I'm new to this list and hoping that this is not off-topic. If it is, please point me in the right direction. I seem to recollect a python module or library for *nix sysadmins, but I can't for the life of me find it again. The module (or library) somehow added unix command capabilities to the python language. It seemed like a lesser known, perhaps new, python library or module. Any input or ideas appreciated /Lars Stavholm The only modules I've come across that barely fit your description are python-unixtools(gzip, bzip only) and shutil(some limited capabilities). Running unix commands is usually done directly(os.popen, os.system) on *nix platforms. Why(and how) would anyone rewrite them as python modules? -- http://mail.python.org/mailman/listinfo/python-list
Re: Are spams on comp.lang.python a major nuisance?
On Sep 27, 7:28 am, Dotan Cohen [EMAIL PROTECTED] wrote: 2008/9/27 Aaron Castironpi Brady [EMAIL PROTECTED]: I think in June and July they were selling watches a lot which I haven't noticed recently. Gucci 104 G-Bandeau Watches - Gucci Watches Discount Rolex Oyster Perpetual Lady Datejust Pearlmaster 18kt Yellow Gold Diamond Ladies Watch 80318C Cartier Must 21 Watches - Cartier Watches Discount I speak too soon. If we start blocking users who have no previous posts and then post many new messages at once, then we wll just push the spammers to forge active list users and reply to threads. That would be a worse situation then we are in now. I say leave well enough alone. Read about the Brain Blood Barrier (http://en.wikipedia.org/wiki/Brain_Blood_Barrier) for an example in nature where although a method to stop an attacker exists, it is not overused to prevent the attacker from becoming more powerful. -- Dotan Cohen http://what-is-what.comhttp://gibberish.co.il א-ב-ג-ד-ה-ו-ז-ח-ט-י-ך-כ-ל-ם-מ-ן-נ-ס-ע-ף-פ-ץ-צ-ק-ר-ש-ת ä-ö-ü-ß-Ä-Ö-Ü Yow! I forgot the radiolabeled polyethylene glycol coated hexadecylcyanoacrylate nanospheres! CMIIW correct me if I'm wrong. Google Groups is a Usenet/c-l-py gateway. Other gateways aren't contributing to spam. What are they doing that G-Groups is not? -- http://mail.python.org/mailman/listinfo/python-list
Re: is decorator the right thing to use?
On Sep 27, 1:44 am, Dmitry S. Makovey [EMAIL PROTECTED] wrote:
George Sakkis wrote:
Although this works, the second argument to ProxyMethod shouldn't be
necessary, it's semantically redundant; ideally you would like to
write it as bmethod = ProxyMethod('b').
since I'm already on exploratory trail (what about that rug being pulled
from under?) With my code I can do really dirty tricks like this (not
necessary that I'm going to):
class B_base:
def bmethod(self):
print 'B_base'
class B(B_base):
def bmethod(self):
print 'B'
class A:
bmethod=ProxyMethod('b',B_base.bmethod)
Yes, that's indeed dirty; don't do it :)
As before, I don't think
that's doable without metaclasses (or worse, stack frame hacking).
Below is the update of my original recipe; interestingly, it's
(slightly) simpler than before:
Out of curiosity (and trying to understand): why do you insist on
dictionaries with strings contents ( {'bmethod' : 'b1' } ) rather than
something more explicit ? Again, I can see that your code is working and I
can even understand what it's doing, just trying to explore alternatives :)
I guess my bias is towards more explicit declarations thus
bmethod=ProxyMethod('b',B.bmethod)
looks more attractive to me, but I stand to be corrected/educated why is
that not the right thing to do?
I see where you're coming from and I also prefer explicit reflection
mechanisms instead of strings (e.g. avoid eval/exec as much as
possible). As I mentioned, the second argument to ProxyMethod is (for
all sane purposes) redundant, so if you could implement it in a way
that bmethod = ProxyMethod('b') worked, I would be all for it, but
AFAIK it's not possible without a metaclass. A dict with string keys
and values to be consumed by a metaclass is perhaps the simplest thing
that could possibly work. It contains all the relevant information for
hooking the proxy to the delegate methods and nothing more; zero
boilerplate code overhead. Also note that it's not that big of a
difference; you have to provide the attribute name as a string anyway.
Another thing that turns me away from string dictionaries is that those are
the ones causing me more trouble hunting down typos. Maybe it's just my
thing so I'm not going to insist on it. I'm open to arguments against that
theory.
From my experience, I am equally prone to typos for both strings and
regular attributes; I agree though that the traceback information is
often more helpful when you mistype an attribute.
One argument I can bring in defence of more explicit declarations is IDE
parsing when autocompletion for B.bme... pops up (suggesting bmethod and
bmethod2) and with 'b':'bmethod' it never happens.
I don't rely on autocompleting IDEs, at least in dynamic languages, so
it's not much of an issue for me but yes, it's another small argument
against strings.
George
--
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Re: Using the 'with' statement with cStringIO objects
So, I'm guessing you can't use the 'with' statement with cStringIO objects? Is this a bug, or do I need to use the 'with' statement differently to get this to work? Thanks, peppergrower Neither, just not implemented. Only classes with __enter__ and __exit__ methods(ie context manager types) can be used in with statements. And, correct me if I'm wrong, I think it's pointless for a StringIO object to have those. -- http://mail.python.org/mailman/listinfo/python-list
Re: Regular expression help: unable to search ' # ' character in the file
On Sat, Sep 27, 2008 at 1:58 PM, Fredrik Lundh [EMAIL PROTECTED]wrote: [EMAIL PROTECTED] wrote: import re fd = open(file, 'r') line = fd.readline pat1 = re.compile(\#*) while(line): mat1 = pat1.search(line) if mat1: print line line = fd.readline() I strongly doubt that this is the code you used. But the above prints the whole file instead of the hash lines only. * means zero or more matches. all lines is a file contain zero or more # characters. but using a RE is overkill in this case, of course. to check for a character or substring, use the in operator: for line in open(file): if # in line: print line /F -- http://mail.python.org/mailman/listinfo/python-list Thanks Fredrik, this works. Indeed it is a much better and cleaner approach. -- Regards, Rajat -- http://mail.python.org/mailman/listinfo/python-list
Re: What do you call a class not intended to be instantiated
In article [EMAIL PROTECTED], Ben Finney [EMAIL PROTECTED] wrote: Steven D'Aprano [EMAIL PROTECTED] writes: On Fri, 26 Sep 2008 22:15:43 -0700, Aahz wrote: An ordinary singleton is instantiating the class multiple times yet returning the same instance object; a class singleton is simply using the class directly (like a module). Where is this class singleton terminology from? It seems redundant to me. It also doesn't seem to have anything to do with what singleton means as a pattern; using a class is simply using a class. I don't remember where I picked it up, probably here some years ago. The point of the terminology is to distinguish how the class is *used*, in precise parallel with module singleton. I'd like to be able to call [a class] as if it were a function. Normally calling a class object returns an instance -- I wish to return something else. In that case, you *don't* want a class at all; the entire point of a class is to define behaviour for instances. Absolutely agreed with your first clause, disagreed about the second clause. As I said earlier, the main point of a class singleton is to get the effect of a module singleton without the need to create another file on disk. In that case there is no instance and therefore the point of the class is no longer to define behavior for instances. But you can't call a module, and classes have well-defined behavior for calling them, so you shouldn't try to pervert a class singleton by defining behavior for calling them. In fact, I would recommend creating an __init__() method that raises NotImplementedError precisely to prevent this usage (or have a __new__() method that returns None, but I generally prefer to recommend practices that work with classic classes). One cute reason to prefer class singletons to module singletons is that subclassing works well for creating multiple singletons. But really, the main reason I use class singletons is that they are the absolute simplest way to get attribute access: class Foo: pass Foo.bar = 'xyz' if data == Foo.bar: print ! Once it gets much more complicated than that, I prefer to use a smarter object. -- Aahz ([EMAIL PROTECTED]) * http://www.pythoncraft.com/ Argue for your limitations, and sure enough they're yours. --Richard Bach -- http://mail.python.org/mailman/listinfo/python-list
Re: how to replace and string in a SELECT ... IN ()
Hi, Michael Mabin wrote: so you wouldn't object then to something like ' in (%)' % ','.join([str_edit_for_exploit(x) for x in aList]) if str_edit_for_exploit applied security edits? Whats an security edit btw? If it is something meant to turn possibly insecure data into 'secure' then, no I would still object. Why? Because its a bad example of default permit. Its always better to have a whitelist - even more so when its so easy to do. Its just a habit you develope - if you never do it right, how would you know when and how to do it right when you need to? Tino smime.p7s Description: S/MIME Cryptographic Signature -- http://mail.python.org/mailman/listinfo/python-list
Re: Time.sleep(0.0125) not available within Linux
On 2008-09-27, Lawrence D'Oliveiro [EMAIL PROTECTED] wrote: In message [EMAIL PROTECTED], Grant Edwards wrote: On 2008-09-26, Lawrence D'Oliveiro [EMAIL PROTECTED] wrote: In message [EMAIL PROTECTED], Grant Edwards wrote: Never assume somebody reading the article and attempting to help you can see the subject line. Why not? Because it might not be. It depends on the user's newsreader and editor settings. So, should I not assume that they can see the content as well, because it might not be visible, depending on the user's newsreader and editor settings? Thats seems like a bit of reductio ad absurdum. My observations over the years confirm the advice that you shouldn't place information solely in the subject line. If you rely on people re-reading the subject line as the read and reply to the body of the posting, you'll often get bad results. People will miss information that was left out of the body and placed solely in the subject line. I've seen it happen over an over again (this thread is an example). If you don't care whether you get timely and accurate responses, then do whatever you want. Otherwise, include all the pertinent information in the body of the posting. -- Grant -- http://mail.python.org/mailman/listinfo/python-list
Re: EPD (Enthought Python Distribution) 4.0.300 Beta 3 available
I have always thought this idea very good, but if I download it and install it (on my MacBook pro) will any conflicts occur with existing bits and pieces of Python and its libraries? Thank you, Christopher Brewster * Department of Computer Science, University of Sheffield Regent Court, 211 Portobello Street Sheffield S1 4DP UNITED KINGDOM Web: http://www.dcs.shef.ac.uk/~kiffer/ Tel: +44(0)114-22.21967 Fax: +44 (0)114-22.21810 Skype: christopherbrewster SkypeIn (UK): +44 (20) 8144 0088 SkypeIn (US): +1 (617) 381-4281 * Corruptissima re publica plurimae leges. Tacitus. Annals 3.27 On 27 Sep 2008, at 07:08, Dave Peterson wrote: Hello, We've recently posted the third beta release of EPD (the Enthought Python Distribution) with Python 2.5 version 4.0.300. You may download the beta from here: http://www.enthought.com/products/epdbeta.php Please help us test it out and provide feedback on the EPD Trac instance: https://svn.enthought.com/epd You can check out the release notes here: http://www.enthought.com/products/epdbetareleasenotes.php About EPD - The Enthought Python Distribution (EPD) is a kitchen-sink-included distribution of the Python™ Programming Language, including over 60 additional tools and libraries. The EPD bundle includes NumPy, SciPy, IPython, 2D and 3D visualization, database adapters, and a lot of other tools right out of the box. http://www.enthought.com/products/epd.php It is currently available as a single-click installer for Windows XP (x86), Mac OS X (a universal binary for OS X 10.4 and above), and RedHat 3 and 4 (x86 and amd64). EPD is free for academic use. An annual subscription and installation support are available for individual commercial use. An enterprise subscription with support for particular deployment environments is also available for commercial purchase. The beta versions of EPD are available for indefinite free trial. -- Dave -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html -- http://mail.python.org/mailman/listinfo/python-list
Re: What do you call a class not intended to be instantiated
In article [EMAIL PROTECTED], [EMAIL PROTECTED] (Aahz) wrote: One cute reason to prefer class singletons to module singletons is that subclassing works well for creating multiple singletons. But really, the main reason I use class singletons is that they are the absolute simplest way to get attribute access: class Foo: pass Foo.bar = 'xyz' if data == Foo.bar: print ! I've often done something similar, creating a dummy class: class Data: pass just so I could create instances of it to hang attributes off of: foo = Data() foo.bar = 'xyz' That's a trick I've been using since the Old Days (i.e. before new-style classes came along). When I saw your example, my first thought was That's silly, now that there's new-style classes, you can just create an instance of object!. Unfortunately, when I tried it, I discovered it didn't work. You *can* instantiate object, but you don't get a class instance, so you can't create attributes on it. x = object() type(x) type 'object' x.foo = 1 Traceback (most recent call last): File stdin, line 1, in module AttributeError: 'object' object has no attribute 'foo' -- http://mail.python.org/mailman/listinfo/python-list
Re: Using the 'with' statement with cStringIO objects
George Boutsioukis [EMAIL PROTECTED] writes: Neither, just not implemented. Only classes with __enter__ and __exit__ methods(ie context manager types) can be used in with statements. And, correct me if I'm wrong, I think it's pointless for a StringIO object to have those. It's definitely superfluous, but it should still be provided, for the same reason a close method is provided, to allow StringIO objects to be treated like other file-like objects. For example, code that does the following: with obj.open_file(...) as f: ... shouldn't have to care if obj.open_file returns a built-in file instance, or a StringIO instance. As the above code becomes more popular, __enter__ and __exit__ are beginning to be part of the file interface (in the duck-typing sense) and should be implemented. Until then, the the contextlib.closing context manager can be used instead: with contextlib.closing(obj.open_file(...)) as f: ... -- http://mail.python.org/mailman/listinfo/python-list
Re: is decorator the right thing to use?
On Sep 27, 9:23 am, George Sakkis [EMAIL PROTECTED] wrote:
On Sep 27, 1:44 am, Dmitry S. Makovey [EMAIL PROTECTED] wrote:
I guess my bias is towards more explicit declarations thus
bmethod=ProxyMethod('b',B.bmethod)
looks more attractive to me, but I stand to be corrected/educated why is
that not the right thing to do?
I see where you're coming from and I also prefer explicit reflection
mechanisms instead of strings (e.g. avoid eval/exec as much as
possible). As I mentioned, the second argument to ProxyMethod is (for
all sane purposes) redundant, so if you could implement it in a way
that bmethod = ProxyMethod('b') worked, I would be all for it, but
AFAIK it's not possible without a metaclass.
Just for completeness, here's a metaclass version that uses
ProxyMethod declarations instead of a dict; you'll probably like this
better:
#=== usage =
from proxies import Proxy, ProxyMethod
class B(object):
def __init__(self, val): self.val = val
def bmethod(self,n): print B::bmethod, self.val, n
def bmethod2(self,n,m): print B::bmethod2, self.val, n, m
class C(object):
def __init__(self, val): self.val = val
def cmethod(self,x): print C::cmethod, self.val, x
def cmethod2(self,x,y): print C::cmethod2,self.val, x, y
cattr = 4
class A(Proxy):
def __init__(self, b1, b2, c):
print init A()
# must call Proxy.__init__
super(A,self).__init__(b1=b1, b2=b2, c=c)
def amethod(self,a):
print A::mymethod,a
bmethod = ProxyMethod('b1')
bmethod2 = ProxyMethod('b2')
cmethod = ProxyMethod('c')
a = A(B(10), B(20), C(30))
a.amethod('foo')
print bound proxy calls
a.bmethod('foo')
a.bmethod2('bar','baz')
a.cmethod('foo')
try: a.cmethod2('bar','baz')
except Exception, ex: print ex
print unbound proxy calls
A.bmethod(a,'foo')
A.bmethod2(a,'bar','baz')
A.cmethod(a, 'foo')
try: A.cmethod2(a,'bar','baz')
except Exception, ex: print ex
#=== output
init A()
A::mymethod foo
bound proxy calls
B::bmethod 10 foo
B::bmethod2 20 bar baz
C::cmethod 30 foo
'A' object has no attribute 'cmethod2'
unbound proxy calls
B::bmethod 10 foo
B::bmethod2 20 bar baz
C::cmethod 30 foo
type object 'A' has no attribute 'cmethod2'
#== proxies.py ==
class _ProxyMeta(type):
def __new__(meta, name, bases, namespace):
for attrname,value in namespace.iteritems():
if isinstance(value, ProxyMethod) and value.name is None:
value.name = attrname
return super(_ProxyMeta,meta).__new__(meta, name, bases,
namespace)
class ProxyMethod(object):
def __init__(self, proxy_attr, name=None):
self._proxy_attr = proxy_attr
self.name = name
def __get__(self, proxy, proxytype):
if proxy is not None:
return self.__get_target_attr(proxy)
else:
return self.__unbound_method
def __unbound_method(self, proxy, *args, **kwds):
method = self.__get_target_attr(proxy)
return method(*args, **kwds)
def __get_target_attr(self, proxy):
try:
delegate = getattr(proxy, self._proxy_attr)
return getattr(delegate, self.name)
except AttributeError:
raise AttributeError('%r object has no attribute %r' %
(proxy.__class__.__name__,
self.name))
class Proxy(object):
__metaclass__ = _ProxyMeta
def __init__(self, **attr2delegate):
self.__dict__.update(attr2delegate)
#==
If you want to eliminate completely specifying attributes with
strings, it's easy to modify the above so that you write instead:
class A(Proxy):
...
bmethod = ProxyMethod(lambda self: self.b1)
bmethod2 = ProxyMethod(lambda self: self.b2)
This is more verbose for the common case, but it's more flexible in
cases where the callable may be more complex than a plain getattr().
Actually you can support both, it doesn't have to be either/or; just
check whether the argument to ProxyMethod is a callable and if not,
make it:
from operator import attrgetter
class ProxyMethod(object):
def __init__(self, proxy_attr, name=None):
if not callable(proxy_attr):
proxy_attr = attrgetter(proxy_attr)
...
Remaining Implementation is left as an exercise to the reader ;)
George
--
http://mail.python.org/mailman/listinfo/python-list
Re: text processing SOLVED
Thanks Black Jack Working -- http://mail.python.org/mailman/listinfo/python-list
Re: Are spams on comp.lang.python a major nuisance?
CMIIW correct me if I'm wrong. Google Groups is a Usenet/c-l-py gateway. Other gateways aren't contributing to spam. What are they doing that G-Groups is not? Actually Google Groups appears to be just displaying the Usenet newsgroup comp.lang.python. The spam filtering which is the topic of this thread is applied to the mailing list python-list@python.org side of things. The gateway between the mailing list and the Usenet newsgroup is on mail.python.org I believe. As to what Google Groups isn't doing, it's not clear. I just visited this group and saw lots of spam. My guess is that we on the mailing list side of things don't see a lot of that because of the spam filter. It seems Google Groups makes it more difficult to report/eliminate spam than other more traditional Usenet newsgroup software might. First you need to view the message (even though it's frequently obvious from the subject alone that it's spam), then click the More Options link, then the Report Message link, then type something in the description field of the form they display and click the Submit button. After that, who knows how long it takes for them to send out a Usenet cancel message? Most people probably see the subject and move on to the next message. In short, it would appear that Google makes it harder to cancel spam than they ought to. Why they don't have spam filters similar to what's on Gmail to trap this stuff is unclear. Skip (Sent via Google Groups, so Grant will probably not see this...) -- http://mail.python.org/mailman/listinfo/python-list
Re: is decorator the right thing to use?
On Sep 27, 11:27 am, George Sakkis [EMAIL PROTECTED] wrote:
If you want to eliminate completely specifying attributes with
strings, it's easy to modify the above so that you write instead:
class A(Proxy):
...
bmethod = ProxyMethod(lambda self: self.b1)
bmethod2 = ProxyMethod(lambda self: self.b2)
It's funny how often you come with a better solution a few moments
after htting send! The snippet above can (ab)use the decorator syntax
so that it becomes:
class A(Proxy):
@ProxyMethod
def bmethod(self):
return self.b1
@ProxyMethod
def bmethod2(self):
return self.b2
With the observation that ProxyMethod has access both to the callable
that returns the delegate and the name of the delegated method, we can
remove the need for the metaclass and the Proxy base class altogether:
class proxymethod(object):
def __init__(self, get_delegate):
self._get_delegate = get_delegate
def __get__(self, proxy, proxytype):
if proxy is not None:
return self.__get_target_attr(proxy)
else:
return self.__unbound_method
def __unbound_method(self, proxy, *args, **kwds):
method = self.__get_target_attr(proxy)
return method(*args, **kwds)
def __get_target_attr(self, proxy):
get_delegate = self._get_delegate
try: return getattr(get_delegate(proxy),
get_delegate.__name__)
except AttributeError:
raise AttributeError('%r object has no attribute %r' %
(proxy.__class__.__name__, get_delegate.__name__))
class A(object):
def __init__(self, b1, b2):
self.b1 = b1
self.b2 = b2
def amethod(self,a):
print A::mymethod,a
@proxymethod
def bmethod(self):
return self.b1
@proxymethod
def bmethod2(self):
return self.b2
a = A(B(10), B(20))
a.amethod('foo')
print bound proxy calls
a.bmethod('foo')
a.bmethod2('bar','baz')
print unbound proxy calls
A.bmethod(a,'foo')
A.bmethod2(a,'bar','baz')
So back to the OP's original question and after a long circle.. a
decorator might well be the right thing to use after all :)
George
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Re: how to replace and string in a SELECT ... IN ()
If the inputs are edited prior to the construction of the string and these fields are used for more than one update then it's not an exploit. It's simply a matter not repeating yourself when coding. In this particular case too, we're talking about a list of integers that gets inserted into a string. If the list is validated prior to its insertion into an SQL statement then there is no exploit. If I write a batch program (not a web program) that retrieves this list of integers from other sources and validates the data prior to using it in an SQL statement, that should be sufficient. As far as wrong and right is concerned. I think it's more about doing what is appropriate according to the circumstances. As a rule you should only code what is appropriate for the circumstances. If it's appropriate to code more simply without introducing unnecessary complexity you should do so. I work in the data warehousing ETL world, where we have to perform field edits or transformations to load source data into databases. If I'm already performing edits on these fields and if these fields are going to be used for more updates downstream, it's wasteful to perform them again when I build the SQL insert with the list and execute it. Finally, whatever happened to the practice of granting appropriate privileges to IDs that perform database operations? Shouldn't the person acting in the capacity of DBA ensure that the user updating or retrieving data from the database does not have DROP, ALTER, or CREATE privileges on that database? On Sat, Sep 27, 2008 at 9:14 AM, Tino Wildenhain [EMAIL PROTECTED] wrote: Hi, Michael Mabin wrote: so you wouldn't object then to something like ' in (%)' % ','.join([str_edit_for_exploit(x) for x in aList]) if str_edit_for_exploit applied security edits? Whats an security edit btw? If it is something meant to turn possibly insecure data into 'secure' then, no I would still object. Why? Because its a bad example of default permit. Its always better to have a whitelist - even more so when its so easy to do. Its just a habit you develope - if you never do it right, how would you know when and how to do it right when you need to? Tino -- | _ | * | _ | | _ | _ | * | | * | * | * | -- http://mail.python.org/mailman/listinfo/python-list
Borg vs Singleton vs OddClass
This is probably unrelated to Python, as this is more about design pattern. I'm asking your comments about this design pattern that is similar in functionality to Singleton and Borg: to share states. I'm thinking about this design pattern (I don't know if anyone has ever thought of this pattern before): class OddClass(object): def __init__(self): global OddClass OddClass = self def __call__(): return self The OddClass is a class that would overwrite its own class definition at its first instantiation. OddClass defines __call__ so that subsequent instantiation (technically it is no more an instantiation, but Duck Typing says it does) of the class would return the single instance. It do have a problem though, that you can't do isinstance(a, OddClass) since the name OddClass no longer refers to the OddClass class descriptor, but to an instance of OddClass. I don't think that's much of a problem though since using isinstance() is generally not a good idea in python (although OddClass do use global which many people, including me, would usually consider as bad form). The problem with Borg is that it is not inheritable (in certain sense[1]) and only work with old-style class (which is due to be completely removed on py3k)[2], Singleton and OddClass is inheritable. class Singleton(object): ... s = Singleton() class A(Singleton): pass class B(Singleton): pass a = A() b = B() s.foo, a.bar = bar, 42 b.foo, b.bar ... Traceback, Attribute Error ... class OddClass(object): ... s = OddClass() class A(OddClass): pass class B(OddClass): pass a = A() b = B() s.foo, a.bar = bar, 42 b.foo, b.bar ... Traceback, Attribute Error ... but for Borg, see [1] [1] classes that inherits from Borg shares state not only within children, but also with their parents and cousins. That means inheriting from Borg is useless, and that also means one Borg code for every state sharing classes, instead of inheriting from Singleton/ OddClass. In code: class Borg: ... class A(Borg): ... class B(Borg): ... s, a, b = Borg(), A(), B() s.foo, a.attr = bar, 42 b.foo, b.attr bar 42 # we want b.foo and b.attr to raise error since .foo, and .bar isn't B's shared state, it's A's and Borg's shared state [2] Actually in new-style class, they say Borg can use __slots__, but they say it'd be slightly more complex -- http://mail.python.org/mailman/listinfo/python-list
Re: python for *nix system admins
import commands ? On Sat, Sep 27, 2008 at 8:06 AM, George Boutsioukis [EMAIL PROTECTED]wrote: On Sat, 27 Sep 2008 10:05:01 +0200, Lars Stavholm wrote: Hi All, I'm new to this list and hoping that this is not off-topic. If it is, please point me in the right direction. I seem to recollect a python module or library for *nix sysadmins, but I can't for the life of me find it again. The module (or library) somehow added unix command capabilities to the python language. It seemed like a lesser known, perhaps new, python library or module. Any input or ideas appreciated /Lars Stavholm The only modules I've come across that barely fit your description are python-unixtools(gzip, bzip only) and shutil(some limited capabilities). Running unix commands is usually done directly(os.popen, os.system) on *nix platforms. Why(and how) would anyone rewrite them as python modules? -- http://mail.python.org/mailman/listinfo/python-list -- | _ | * | _ | | _ | _ | * | | * | * | * | -- http://mail.python.org/mailman/listinfo/python-list
Re: python for *nix system admins
I've been growing a library of my own functions, that use the names of unix commands. They are just conveniences, of course, but I'd suggest the same for sysadmins, it's handy. -- http://mail.python.org/mailman/listinfo/python-list
Re: python for *nix system admins
On Sat, Sep 27, 2008 at 3:32 PM, Eric Wertman [EMAIL PROTECTED] wrote: I've been growing a library of my own functions, that use the names of unix commands. They are just conveniences, of course, but I'd suggest the same for sysadmins, it's handy. Can you share it? Best, SB. -- http://mail.python.org/mailman/listinfo/python-list
File modifications
Hello folks , I have a file like this /T_0_size=105((-bin-ulockmgr_server:0.99[NHX:C=0.195.0],(((-bin-hostname:0.00 [NHX:C=200.0.0], (-bin-dnsdomainname:0.00[NHX:C=200.0.0],(-bin-domainname:0.00[NHX:C=200.0.0],(-bin-nisdomainname:0.00[NHX:C=200.0.0],-bin-ypdomainname:0.00[NHX:C=200.0.0]):0.00):0.00):0.00):0.98 ,(-bin-iptables-xml:0.97[NHX:C=0.183.0],(-bin-dbus-send:0.78[NHX:C=0.94.0],-bin-dbus-monitor:0.78[NHX:C=0.94.0]):0.97):0.98):0.99. I wanna get the file in this format ((-bin-ulockmgr_server:0.99,(((-bin-hostname:0.00,(-bin-dnsdomainname:0.00,(-bin-domainname:0.00,(-bin-nisdomainname:0.00,-bin-ypdomainname:0.00):0.00):0.00):0.00):0.98 ,(-bin-iptables-xml:0.97,(-bin-dbus-send:0.78,-bin-dbus-monitor:0.78):0.97):0.98):0.99 ie , remove /T_0_size , [NHC:C=0.195.0] , [NHX:C=200.0.0] and so on , how should i handle this after reading the file? Thanks Aditya -- http://mail.python.org/mailman/listinfo/python-list
Re: how to replace and string in a SELECT ... IN ()
Hi, Michael Mabin wrote: If the inputs are edited prior to the construction of the string and these fields are used for more than one update then it's not an exploit. It's simply a matter not repeating yourself when coding. In python we do not fear that. In this particular case too, we're talking about a list of integers that gets inserted into a string. If the list is validated prior to its Its a list, if it indeed has integers in it is uncertain. It is so very easy to check that that it doesnt even make sense to write such lengthy emails about how bad you want to avoid it. Just do it. And even more so if you are telling others how to do things make sure they do not so easy shoot themselfes in their feet. insertion into an SQL statement then there is no exploit. If I write a batch program (not a web program) that retrieves this list of integers from other sources and validates the data prior to using it in an SQL statement, that should be sufficient. This might be well true but if you have a look at your original contribution you see that all these your asumtions are just not in. As far as wrong and right is concerned. I think it's more about doing what is appropriate according to the circumstances. As a rule you If its easy to do, why not just doing it correctly (or robust) in all circumstances to just avoid overlooking a case? should only code what is appropriate for the circumstances. If it's appropriate to code more simply without introducing unnecessary complexity you should do so. But you did not tell us about your asumtations about the circumstances. I work in the data warehousing ETL world, where we have to perform field edits or transformations to load source data into databases. If I'm Thats wrong. You do not edit fields. You have a validating type path and _always_ the database is most authoritative about what it accepts. Any other concept is just wrong and outright dangerous. There are many examples of how this works out (just check bugtraq) already performing edits on these fields and if these fields are going to be used for more updates downstream, it's wasteful to perform them again when I build the SQL insert with the list and execute it. I still don't know what you mean by edit ;) If you mean filter out special chars with for example replace(bad stuff,good stuff) check your idea again, this is not going to work. (google for default permit) Finally, whatever happened to the practice of granting appropriate privileges to IDs that perform database operations? Shouldn't the person acting in the capacity of DBA ensure that the user updating or retrieving data from the database does not have DROP, ALTER, or CREATE privileges on that database? This of course is another layer which should be added - but you would not need to - you edited the fields, right? ;) Sorry, it was not meant to put you to the wall but you insist so much on your still dangerous solution while top posting the hell out of this thread I just could not ignore it ;) T. smime.p7s Description: S/MIME Cryptographic Signature -- http://mail.python.org/mailman/listinfo/python-list
Re: What do you call a class not intended to be instantiated
Aahz wrote:
In article [EMAIL PROTECTED],
Ben Finney [EMAIL PROTECTED] wrote:
Steven D'Aprano [EMAIL PROTECTED] writes:
I'd like to be able to call [a class] as if it were a function.
Normally calling a class object returns an instance -- I wish to
return something else.
In that case, you *don't* want a class at all; the entire point of a
class is to define behaviour for instances.
Absolutely agreed with your first clause, disagreed about the second
clause. As I said earlier, the main point of a class singleton is to get
the effect of a module singleton without the need to create another file
on disk.
In 3.0, at least, one does not need a disk file to create a module.
import types
me = types.ModuleType('me') # type(__builtins__) works, no import
me
module 'me' (built-in)
me.a = 1
me.a
1
me.a + 1
2
That said, a blank class is even easier, and the representation is better.
tjr
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check if file is MS Word or PDF file
What should I look for in a file to determine whether or not it is a
MS Word file or an Excel file or a PDF file, etc., etc.? including Zip
files
I don`t want to check for file extension.
os.path.splitext('Filename.jpg') will produce a tuple of filename and
extension, but some file don`t even have extension and can still be read by
MS Word or NotePad. i want to be 100% sure of the file.
--
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Abstract Base Class register function
I have been experimenting with the abc module in py3k and thought about using the register method of an ABC as a class decorator: code import abc class MyABC(metaclass=abc.ABCMeta): pass @MyABC.register class MySub(): pass /code This doesn't work because the register method returns None. It would be a fairly simple modification to have this work: code def register(cls, subclass): Register a virtual subclass of an ABC. ... etc ... return subclass /code What do people think of this behavior? -- -Mikolai Fajer- -- http://mail.python.org/mailman/listinfo/python-list
Hello boys!
Hello, this is Milenko Stojadinovic from town Banjaluka, Bosnia and Herzegovina, also known as Cvrcko Does anyone know of any bars in town where I can swallow a bucket of cum? It can be either dog, horse or human cum. Also, does anyone know of any sex bars where people will shit in your mouth? I also like eating shit. -- Name: Mileno Stojadinovic - Cvrcko Street adress: Sime Matavulja 12 Town: 78000 Banja Luka Country: Bosnia and Herzegovina Home phone: +38751/303-665 Cell phone: +38765/499-312 Email adress: [EMAIL PROTECTED] ~ The new pumpkin rarely pulls Terrance, it teases Sharon instead. For Susan the tape's sad, beside me it's unique, whereas against you it's believing dirty. Hey, go reject a fork! Why did Alice open throughout all the boats? We can't explain poultices unless Woody will mercilessly judge afterwards. The frames, disks, and shirts are all fat and fresh. Who will we dine after Edwina wastes the thin mirror's goldsmith? It's very outer today, I'll recollect strangely or Christopher will learn the teachers. Hardly any humble brave tyrants hourly solve as the tired wrinkles cover. Hardly any distant buttons are short and other urban ointments are filthy, but will Robette receive that? Let's lift behind the deep highways, but don't promise the heavy diets. Who kicks badly, when Melvin burns the stale code before the autumn? Get your absolutely moulding barber within my cellar. If you will laugh Gay's hill against porters, it will incredibly climb the case. Some shopkeepers arrive, irrigate, and shout. Others sadly expect. To be pathetic or sticky will talk abysmal oranges to wickedly look. Are you healthy, I mean, moving above clever onions? While farmers partly taste pins, the powders often excuse against the blunt jackets. Generally Susanne will order the sticker, and if George actually seeks it too, the bowl will attempt with the polite lane. He can hate durable kettles above the rural bad ocean, whilst Oscar easily scolds them too. You eventually fill against Norma when the kind drapers irritate among the poor summer. As surprisingly as Dolf converses, you can dye the cap much more familiarly. Brion, still killing, behaves almost eerily, as the sauce changes on their coffee. You won't recommend me grasping about your lazy office. Almost no butchers steadily live the lost signal. Cyrus's hat improves among our desk after we sow towards it. Ralph measures the weaver within hers and wanly calls. Some cosmetic tags answer David, and they rigidly walk Quincy too. When Richard's elder gardner dreams, Mark cares for weak, closed islands. He might strongly fear think and plays our cheap, sour painters above a bathroom. I creep the active yogi and cook it in back of its dorm. Tell Katherine it's strong loving within a tree. Why will you jump the angry lower exits before Murray does? I am unbelievably bitter, so I wander you. How does Hector smell so regularly, whenever Ronald likes the solid twig very slowly? Julieta, have a hot printer. You won't clean it. Fucking don't join a dryer! She wants to nibble inner smogs under Usha's castle. She'd rather depart grudgingly than help with Bernadette's younger grocer. Other old dark cards will comb frantically alongside cans. Try pouring the monument's pretty cat and Oliver will attack you! Don't try to seek halfheartedly while you're jumping throughout a easy carpenter. He'll be climbing in front of good Cypriene until his enigma answers quietly. What doesn't Janet smell inadvertently? They are opening before the rain now, won't explain walnuts later. Some light long game covers pools outside Woodrow's rich film. Why did Oscar judge the pear with the handsome spoon? He will talk nearly if Julieta's tailor isn't wet. Just looking beside a ulcer through the store is too young for Woody to care it. Both filling now, Alejandro and Marty irritated the open rivers about smart envelope. Occasionally, dusts kill beside rude fires, unless they're sweet. Her pen was sharp, dull, and fears over the spring. Zack, on floors difficult and upper, attacks towards it, recollecting seemingly. We measure the raw sauce. They are rejecting throughout quiet, towards empty, in back of cold units. My wide potter won't clean before I comb it. If you'll pour Edward's camp with aches, it'll admiringly converse the cup. I was promising frogs to worthwhile Corinne, who's walking in back of the counter's stable. It can receive clean pickles, do you solve them? Many jugs will be weird lean carrots. Roger helps, then Walt stupidly believes a ugly lentil on Catherine's road. We tease them, then we weekly dream Zack and Annabel's blank candle. A lot of shallow dose or canyon, and she'll locally excuse everybody. If the bizarre balls can sow bimonthly, the hollow raindrop may love more ventilators. We laugh weekly, unless Jezebel grasps shoes outside Jimmie's puddle. Jimmy! You'll mould plates. Just now, I'll dine the
Configuring pyc directory
Is there a way to configure python to read/write compiled pyc files for modules in a directory other than the directory containing the original py files? I'm trying trying to secure an Apache server running mod_python and don't want the process compiling the pyc files to have write access to the folder containing my site's py modules. I realize the solution (if it exists) may lie with mod_python rather than python itself, so I've also pinged the mod_python mailing list for help. I'm checking here as well, though, just in case there's some solution built into python. Thanks, Robert -- http://mail.python.org/mailman/listinfo/python-list
Re: check if file is MS Word or PDF file
On Sat, Sep 27, 2008 at 2:43 PM, A. Joseph [EMAIL PROTECTED] wrote:
What should I look for in a file to determine whether or not it is a
MS Word file or an Excel file or a PDF file, etc., etc.? including Zip
files
I don`t want to check for file extension.
os.path.splitext('Filename.jpg') will produce a tuple of filename and
extension, but some file don`t even have extension and can still be read by
MS Word or NotePad. i want to be 100% sure of the file.
Well, if you're on unix, you could run the 'file' command and check
its output using the 'subprocess' module, but it sounds like you're on
Windows...
Regards,
Chris
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Re: Using the 'with' statement with cStringIO objects
Thanks for the help. I'm fairly new to programming (which you probably could have guessed...). When I realized that you could use a StringIO instance as if it were a file, I wanted to try some of the same techniques on it as I would with a file. In this case, I wanted to use a for line in testfile construction to iterate over the StringIO instance. (I did find a better way for my particular case, one that didn't involve StringIO at all.) When I got that particular error, I suspected that it had something to do with the relative newness of the 'with' statement. If this is something that should be considered for addition in the future, is there somewhere specific I should suggest that? -- http://mail.python.org/mailman/listinfo/python-list
Re: multiprocessing eats memory
When processing data in parallel you will use up as muchmemoryas many datasets you are processing at any given time. Worker processes eats 2-4 times more than I pass to them. If you need to reducememoryuse then you need to start fewer processes and use some mechanism to distribute the work on them as they become free. (see recommendation that uses Queues) I don't understand how could I use Queue here? If worker process finish computing, it puts its' id into Queue, in main process I retrieve that id and how could I retrieve result from worker process then? -- http://mail.python.org/mailman/listinfo/python-list
Re: check if file is MS Word or PDF file
On Sat, Sep 27, 2008 at 5:43 PM, A. Joseph [EMAIL PROTECTED] wrote:
What should I look for in a file to determine whether or not it is a
MS Word file or an Excel file or a PDF file, etc., etc.? including Zip
files
I don`t want to check for file extension.
os.path.splitext('Filename.jpg') will produce a tuple of filename and
extension, but some file don`t even have extension and can still be read by
MS Word or NotePad. i want to be 100% sure of the file.
You could use the mimetypes module...
import mimetypes
mimetypes.guess_type(LegalNotices.pdf)
('application/pdf', None)
-mike
--
Michael E. Crute
http://mike.crute.org
God put me on this earth to accomplish a certain number of things.
Right now I am so far behind that I will never die. --Bill Watterson
--
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Re: Hello boys!
On Sat, 27 Sep 2008 14:56:07 -0700 (PDT), Milenko Stojadinovic Cvrcko [EMAIL PROTECTED] wrote: Hello, this is Milenko Stojadinovic from town Banjaluka, Bosnia and Herzegovina, also known as Cvrcko Does anyone know of any bars in town where I can swallow a bucket of cum? It can be either dog, horse or human cum. Also, does anyone know of any sex bars where people will shit in your mouth? I also like eating shit. Come to the US and park your mouth in front of George Bush - all the Bshit you can eat - and it keeps on coming! I have a buddy in Bosna - he's normal. -- == Posted via Pronews.Com - Unlimited-Unrestricted-Secure Usenet News== http://www.pronews.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= - Total Privacy via Encryption =--- -- http://mail.python.org/mailman/listinfo/python-list
Re: Hello boys!
On Sat, 27 Sep 2008 18:47:16 -0400, default [EMAIL PROTECTED] wrote: On Sat, 27 Sep 2008 14:56:07 -0700 (PDT), Milenko Stojadinovic Cvrcko [EMAIL PROTECTED] wrote: Hello, this is Milenko Stojadinovic from town Banjaluka, Bosnia and Herzegovina, also known as Cvrcko Does anyone know of any bars in town where I can swallow a bucket of cum? It can be either dog, horse or human cum. Also, does anyone know of any sex bars where people will shit in your mouth? I also like eating shit. Come to the US and park your mouth in front of George Bush - all the Bshit you can eat - and it keeps on coming! I have a buddy in Bosna - he's normal. Now you know why I blanket kill-file googlegroups. ...Jim Thompson -- | James E.Thompson, P.E. |mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems |manus| | Phoenix, Arizona 85048Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com |1962 | Viewed from afar, even whores and Democrats seem reputable -- http://mail.python.org/mailman/listinfo/python-list
Re: check if file is MS Word or PDF file
On Sat, Sep 27, 2008 at 3:42 PM, Michael Crute [EMAIL PROTECTED] wrote:
On Sat, Sep 27, 2008 at 5:43 PM, A. Joseph [EMAIL PROTECTED] wrote:
What should I look for in a file to determine whether or not it is a
MS Word file or an Excel file or a PDF file, etc., etc.? including Zip
files
I don`t want to check for file extension.
os.path.splitext('Filename.jpg') will produce a tuple of filename and
extension, but some file don`t even have extension and can still be read by
MS Word or NotePad. i want to be 100% sure of the file.
You could use the mimetypes module...
import mimetypes
mimetypes.guess_type(LegalNotices.pdf)
('application/pdf', None)
Looking at the docs for the mimetypes module, it just guesses based on
the filename (and extension), not the actual contents of the file, so
it doesn't really help the OP, who wants to make sure their program
isn't misled by an inaccurate extension.
Regards,
Chris
--
Follow the path of the Iguana...
http://rebertia.com
-mike
--
Michael E. Crute
http://mike.crute.org
God put me on this earth to accomplish a certain number of things.
Right now I am so far behind that I will never die. --Bill Watterson
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Re: Hello boys!
On Sat, 27 Sep 2008 15:56:39 -0700, Jim Thompson [EMAIL PROTECTED] wrote: Now you know why I blanket kill-file googlegroups. ...Jim Thompson I knew that! Every now and then one groper will make it back to the scene of his crime - but, granted, there was no hope for this one. -- == Posted via Pronews.Com - Unlimited-Unrestricted-Secure Usenet News== http://www.pronews.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= - Total Privacy via Encryption =--- -- http://mail.python.org/mailman/listinfo/python-list
Re: EPD (Enthought Python Distribution) 4.0.300 Beta 3 available
Disclosure: I work for Enthought. Christopher Brewster wrote: I have always thought this idea very good, but if I download it and install it (on my MacBook pro) will any conflicts occur with existing bits and pieces of Python and its libraries? For the Mac distribution, we have tried very carefully to keep EPD's Python separate from any previous installation. I believe the only thing that will get overwritten is that our bin/ directory inside our version of Python.framework will get prepended to your $PATH environment variable. This will be added to your ~/.bash_profile with a a descriptive comment. When you type $ python at your Terminal prompt, you will get EPD's Python. To uninstall EPD, you can remove those lines in your ~/.bash_profile, delete /Library/Frameworks/Python.framework/Versions/4.0.300/, and delete /Applications/EPD something or other/. Then your previous Python installation should be usable again. To just use your previous Python installation without uninstalling EPD, just comment out our addition to ~/.bash_profile. If you have more questions about EPD, please join us on the enthought-dev mailing list: https://mail.enthought.com/mailman/listinfo/enthought-dev -- Robert Kern I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth. -- Umberto Eco -- http://mail.python.org/mailman/listinfo/python-list
Re: Hello boys!
In rec.crafts.metalworking Jim Thompson [EMAIL PROTECTED] wrote: On Sat, 27 Sep 2008 18:47:16 -0400, default [EMAIL PROTECTED] wrote: On Sat, 27 Sep 2008 14:56:07 -0700 (PDT), Milenko Stojadinovic Cvrcko [EMAIL PROTECTED] wrote: Hello, this is Milenko Stojadinovic from town Banjaluka, Bosnia and Herzegovina, also known as Cvrcko Does anyone know of any bars in town where I can swallow a bucket of cum? It can be either dog, horse or human cum. Also, does anyone know of any sex bars where people will shit in your mouth? I also like eating shit. Come to the US and park your mouth in front of George Bush - all the Bshit you can eat - and it keeps on coming! I have a buddy in Bosna - he's normal. Now you know why I blanket kill-file googlegroups. So you and everybody can talk about them nonstop? -- http://mail.python.org/mailman/listinfo/python-list
Re: What do you call a class not intended to be instantiated
Aaron Castironpi Brady wrote:
class A(type):
... def __call__( self, *ar ):
... print 'call', self, ar
...
class B(object):
... __metaclass__= A
...
B(3)
call class '__main__.B' (3,)
Overriding the __call__ method of 'type' has the effect of giving you
a static __call__ method on a class-- a method which doesn't need an
instance to call. Your behavior may be counterintuitive though, to
someone who wants to instantiate 'B', in this case, and proceed like a
normal object. That is, they want to call a generic class and use it,
and also expect instances of B to behave as B. You can't have both,
so either return B from B.__new__, or, to instantiate B, take the long
way and call B.__new__ directly.
B.__new__(B)
__main__.B object at 0x009FDB70
Has anyone stepped through the C code to find out when the decision is
made to call which function, B.__new__ or A.__call__, when B is
called?
For Python coded objects, ob(*args) in code translates to internal
execution of type(ob).__call__(ob, *args) (without further
translation!). The interpreter compiles a statement at a time, without
looking back to do type inferencing, and so does not know what type is
being called or if it is even callable.
For B, B(*args) == type(B).__call__(B, *args) == A.__call__(B, *args).
So there is no decision.
For C coded objects, I believe ob(*args) in Python code translate to a C
call of the C equivalent of type(ob).tp_call (or something like that).
From observation, type.tp_call acts something like this:
def __call__(cls, *args):
if cls == type:
if len(*args):
return arg[0].__class__
elif len(*args) == 3:
return type.__new__(type, *args) # or maybe not pass type?
else:
raise TypeError('type() takes 1 or 3 arguments')
else:
return cls.__new__(cls, *args)
So, for a normal class C (an instance of type), type.__call__ calls
C.__new__.
Terry Jan Reedy
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Re: What do you call a class not intended to be instantiated
On Sep 27, 6:16 pm, Terry Reedy [EMAIL PROTECTED] wrote:
Aaron Castironpi Brady wrote:
class A(type):
... def __call__( self, *ar ):
... print 'call', self, ar
...
class B(object):
... __metaclass__= A
...
B(3)
call class '__main__.B' (3,)
Overriding the __call__ method of 'type' has the effect of giving you
a static __call__ method on a class-- a method which doesn't need an
instance to call. Your behavior may be counterintuitive though, to
someone who wants to instantiate 'B', in this case, and proceed like a
normal object. That is, they want to call a generic class and use it,
and also expect instances of B to behave as B. You can't have both,
so either return B from B.__new__, or, to instantiate B, take the long
way and call B.__new__ directly.
B.__new__(B)
__main__.B object at 0x009FDB70
Has anyone stepped through the C code to find out when the decision is
made to call which function, B.__new__ or A.__call__, when B is
called?
For Python coded objects, ob(*args) in code translates to internal
execution of type(ob).__call__(ob, *args) (without further
translation!). The interpreter compiles a statement at a time, without
looking back to do type inferencing, and so does not know what type is
being called or if it is even callable.
For B, B(*args) == type(B).__call__(B, *args) == A.__call__(B, *args).
So there is no decision.
For C coded objects, I believe ob(*args) in Python code translate to a C
call of the C equivalent of type(ob).tp_call (or something like that).
From observation, type.tp_call acts something like this:
def __call__(cls, *args):
if cls == type:
if len(*args):
return arg[0].__class__
elif len(*args) == 3:
return type.__new__(type, *args) # or maybe not pass type?
else:
raise TypeError('type() takes 1 or 3 arguments')
else:
return cls.__new__(cls, *args)
So, for a normal class C (an instance of type), type.__call__ calls
C.__new__.
Terry Jan Reedy
Oh, I see. Then it's the class statement that calls type.__new__.
class A: ...
- A= type( 'A', ... )
- A= type.__call__( type, 'A', ... )
- A= type.__new__( type, 'A', ... )
Plus an iteration over the contents of 'namespace', to search for
properties that themselves have a __get__ method. And returns an
unboundmethod instance of it, for a value of of that's hard to
concentrate on. I jest.
Perhaps what Steven is looking for is a subclass of 'type' that does
not give this default behavior of 'unboundmethoding' everything it
can. That is, defaulting to 'staticmethod' or 'classmethod', and
perhaps offering a 'boundmethod' decorator for the exceptions.
For the case of '__call__', which he does want to control, that could
merely call B.__call__, instead of B.__new__. Untested:
class A(type):
... def __call__( self, *ar ):
... return self.__call__( *ar )
or
... return self.__call__( self, *ar )
Which would come through to 'B' as:
class B(object):
... __metaclass__= A
... def __call__( cls, *ar ).
This is because self == B in the example. This makes me scowl. Very
odd.
--
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Re: check if file is MS Word or PDF file
On Sep 27, 4:01 pm, Chris Rebert [EMAIL PROTECTED] wrote:
On Sat, Sep 27, 2008 at 3:42 PM, Michael Crute [EMAIL PROTECTED] wrote:
On Sat, Sep 27, 2008 at 5:43 PM, A. Joseph [EMAIL PROTECTED] wrote:
What should I look for in a file to determine whether or not it is a
MS Word file or an Excel file or a PDF file, etc., etc.? including Zip
files
I don`t want to check for file extension.
os.path.splitext('Filename.jpg') will produce a tuple of filename and
extension, but some file don`t even have extension and can still be read by
MS Word or NotePad. i want to be 100% sure of the file.
You could use the mimetypes module...
import mimetypes
mimetypes.guess_type(LegalNotices.pdf)
('application/pdf', None)
Looking at the docs for the mimetypes module, it just guesses based on
the filename (and extension), not the actual contents of the file, so
it doesn't really help the OP, who wants to make sure their program
isn't misled by an inaccurate extension.
Regards,
Chris
--
Follow the path of the Iguana...http://rebertia.com
-mike
--
Michael E. Crute
http://mike.crute.org
God put me on this earth to accomplish a certain number of things.
Right now I am so far behind that I will never die. --Bill Watterson
--
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Check http://sourceforge.net/project/showfiles.php?group_id=23617
for the 'file' command for Windows.
~Sean
--
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Re: how to replace and string in a SELECT ... IN ()
I'm exhausted, so I'll just shut up about this after a few final words. 1. edits is used in data warehousing to describe data scrubbing or filtering of fields in records that are used as input sources for loading into data warehouses. It's a term that goes way back to batch processing on the mainframe, so it's been used this way for a long time. Sometimes we use 'validation' interchangeably with 'edit' but our use of validation usually involves a check of input data against business rules and not type or range checking which we consider 'edits'. So maybe you're not used to hearing the term used this way, but it is a variation perhaps of what you're used to. 2. The data warehousing world is quite different from the web world in many respects. I appreciate the fact that web application developers must always be mindful of the 'barbarians at the gates' but our batch environments are locked down, especially our databases. We have secured batch IDs. Our programs are run using an automated schedule. Our databases are secured to begin with so not even our batch IDs have alter, create or drop permissions on the database. There's no way this exploit would ever enter this environment because those servers aren't accessible through the web or online. 3. When you say 'in python we don not fear that' it's curious, because it assumes that all Python users must think as you do. And yet, clearly I don't think as you do. I really like this language and praise the Netherlands each day I wake up that they gave us someone as brilliant as Guido to make programming fun and not such a chore. But I think there are valid reasons for taking different approaches to security, data validation and dare I say it -- field editing -- despite the claims of many who say that in Python - TOOWTDI. 4. It's also curious that I was obliged to state my assumptions about batch programming vs. web programming. There is nothing in the OP to suggest that the problem was related to web programming. It's a question about how to interpolate the values in a list with format specifiers in a SQL statement. Still, if this list is not the result of user input but was derived within the body of the program, which by itself has no malicious intent, are we still going to code this as if it were input by a user that might be a hacker? This seems retarded and paranoid to me. And where in that post does it say that the list is from web input? Although to be fair maybe most of the Python community is doing web development. Thanks for the stimulating and educational discussion. On Sat, Sep 27, 2008 at 4:30 PM, Tino Wildenhain [EMAIL PROTECTED] wrote: Hi, Michael Mabin wrote: If the inputs are edited prior to the construction of the string and these fields are used for more than one update then it's not an exploit. It's simply a matter not repeating yourself when coding. In python we do not fear that. In this particular case too, we're talking about a list of integers that gets inserted into a string. If the list is validated prior to its Its a list, if it indeed has integers in it is uncertain. It is so very easy to check that that it doesnt even make sense to write such lengthy emails about how bad you want to avoid it. Just do it. And even more so if you are telling others how to do things make sure they do not so easy shoot themselfes in their feet. insertion into an SQL statement then there is no exploit. If I write a batch program (not a web program) that retrieves this list of integers from other sources and validates the data prior to using it in an SQL statement, that should be sufficient. This might be well true but if you have a look at your original contribution you see that all these your asumtions are just not in. As far as wrong and right is concerned. I think it's more about doing what is appropriate according to the circumstances. As a rule you If its easy to do, why not just doing it correctly (or robust) in all circumstances to just avoid overlooking a case? should only code what is appropriate for the circumstances. If it's appropriate to code more simply without introducing unnecessary complexity you should do so. But you did not tell us about your asumtations about the circumstances. I work in the data warehousing ETL world, where we have to perform field edits or transformations to load source data into databases. If I'm Thats wrong. You do not edit fields. You have a validating type path and _always_ the database is most authoritative about what it accepts. Any other concept is just wrong and outright dangerous. There are many examples of how this works out (just check bugtraq) already performing edits on these fields and if these fields are going to be used for more updates downstream, it's wasteful to perform them again when I build the SQL insert with the list and execute it. I still don't know what you mean by edit ;) If you mean filter out
Re: Not fully OO ?
2008/9/27 Aaron Castironpi Brady [EMAIL PROTECTED]: No way. It's *zero* instead of one, if so, because the only thing C# has is a bunch of handcuffs and implicit 'self'. You have a line like: You don't follow what I said, and from your tone I get the feeling you don't *want* to follow what I'm saying, not because I'm criticising Python (I'm not), but because I'm guilty of the heresy of suggesting that it's not actually simultaneoulsy optimised for every possible use. My point is that there are zero parameters as far as I am concerned because I don't actually touch most of the GUI code. There could actually be hundreds of parameters, for all I care. They're not my concern. Most of the time I like that -- the tools are doing my work for me. -- Tim Rowe -- http://mail.python.org/mailman/listinfo/python-list
Re: check if file is MS Word or PDF file
On Sat, Sep 27, 2008 at 7:01 PM, Chris Rebert [EMAIL PROTECTED] wrote: Looking at the docs for the mimetypes module, it just guesses based on the filename (and extension), not the actual contents of the file, so it doesn't really help the OP, who wants to make sure their program isn't misled by an inaccurate extension. One other way to detect a pdf is to just read the first 4 bytes from the file. Valid pdf files start with %PDF-. Something similar can be done with Word docs but I don't know what the magic bytes are. This approach is pretty similar to what the file command does but is probably a better approach if you have to support multiple platforms. -mike -- Michael E. Crute http://mike.crute.org God put me on this earth to accomplish a certain number of things. Right now I am so far behind that I will never die. --Bill Watterson -- http://mail.python.org/mailman/listinfo/python-list
Re: Borg vs Singleton vs OddClass
Lie wrote: This is probably unrelated to Python, as this is more about design pattern. I'm asking your comments about this design pattern that is similar in functionality to Singleton and Borg: to share states. I'm thinking about this design pattern (I don't know if anyone has ever thought of this pattern before): class OddClass(object): def __init__(self): global OddClass OddClass = self def __call__(): I'll change this to def __call__(self): return self The OddClass is a class that would overwrite its own class definition at its first instantiation. OddClass defines __call__ so that subsequent instantiation (technically it is no more an instantiation, but Duck Typing says it does) of the class would return the single instance. This seems like a terrible idea to me, but then I never really understood the appeal of the Singleton pattern, especially in Python. Singleton and OddClass is inheritable. class OddClass(object): ... s = OddClass() class A(OddClass): pass Traceback (most recent call last): File stdin, line 1, in module TypeError: Error when calling the metaclass bases __init__() takes exactly 1 argument (4 given) Oops! And assuming you carefully ordered your code so that OddClass will never be instantiated before it is subclassed (which seems fragile), you get behavior like this: s = OddClass() s is OddClass() True a = A() s is OddClass() False a is OddClass() True a is A() False a is OddClass() False -Miles -- http://mail.python.org/mailman/listinfo/python-list
Re: Not fully OO ?
On Sep 27, 6:55 pm, Tim Rowe [EMAIL PROTECTED] wrote: 2008/9/27 Aaron Castironpi Brady [EMAIL PROTECTED]: No way. It's *zero* instead of one, if so, because the only thing C# has is a bunch of handcuffs and implicit 'self'. You have a line like: You don't follow what I said, and from your tone I get the feeling you don't *want* to follow what I'm saying, not because I'm criticising Python (I'm not), but because I'm guilty of the heresy of suggesting that it's not actually simultaneoulsy optimised for every possible use. My point is that there are zero parameters as far as I am concerned because I don't actually touch most of the GUI code. There could actually be hundreds of parameters, for all I care. They're not my concern. Most of the time I like that -- the tools are doing my work for me. -- Tim Rowe flamewar.avert( ), please. Yes, I agree, I did not follow every word. It's a fundamental disagreement about successful ways to communicate, and, for the philosophers, successful communication, whether I should have nitpicked first thing, or tried to go along with the gist. I tried the latter. In your case, I guessed wrong. Sorry. Before I tried wxFormBuilder, I imagined that C# would be vastly faster to develop than Python, for anything requiring any non-trivial graphical interface. I've done extensive VB, so I can attest to that personally. It is not. The difference in dev times is about the time it takes to write: def onClick( event ): ... controlA.bind( wx.MOUSEDOWN, onClick ) perhaps several times, which, glances at watch, is not long. You do get the IDE, true, and that code is auto-crafted for you. But 'wx' does give you data in an XML file, instead of a script. And talk about a difference in identifiers: form button pos20,30/pos colorgray/color /button /form vs. form.button.pos= 20, 30 form.button.color= gray You can come up with examples that favor either. But the opposite of statistical is anecdotal. Sorry again. The last time I 'checked in' at your post, your claim was an hour or so vs. ages. Hence my responses. You could probably sneak by by claiming a factor of *two*, but if you were exaggerating, please say so at any time. Penultimately, forgive my sarcasm--- I'm a bit feisty right now. I was distinguishing between arguments in particular, and identifiers in general. And lastly, simultaneoulsy optimised for every possible use is a bold claim that I didn't make, at least, to come forward, in so many words. I do believe, and it shows, as of today, and you can quote me on this, that it's pretty generally applicable, though I reserve the right to change my mind on the matter with or without notice. Especially if I learn something. I do not believe that C# is pretty generally applicable. I maintain that I will adjust that estimate if I ever get any facts about C#, since I don't have very many. (In fact, outside of my VB, COM, and MFC experience, you could say I have no clue. Very tongue in cheek.) In fact, do a Google for 'castironpi every possible'. You get a can't ... every possible, and your post, and something else. That's it. Python has a lot of things C# doesn't. Can we agree on that? -- http://mail.python.org/mailman/listinfo/python-list
Re: Hello boys!
On Sat, 27 Sep 2008 23:12:59 + (UTC), Cydrome Leader [EMAIL PROTECTED] wrote: In rec.crafts.metalworking Jim Thompson [EMAIL PROTECTED] wrote: On Sat, 27 Sep 2008 18:47:16 -0400, default [EMAIL PROTECTED] wrote: On Sat, 27 Sep 2008 14:56:07 -0700 (PDT), Milenko Stojadinovic Cvrcko [EMAIL PROTECTED] wrote: Hello, this is Milenko Stojadinovic from town Banjaluka, Bosnia and Herzegovina, also known as Cvrcko Does anyone know of any bars in town where I can swallow a bucket of cum? It can be either dog, horse or human cum. Also, does anyone know of any sex bars where people will shit in your mouth? I also like eating shit. Come to the US and park your mouth in front of George Bush - all the Bshit you can eat - and it keeps on coming! I have a buddy in Bosna - he's normal. Now you know why I blanket kill-file googlegroups. So you and everybody can talk about them nonstop? If you mean Google Groups the condemnation is justified. Who is them? Real people do occasionally wander in to GG - or those without news servers - or without understanding of Usenet. Basically, in the engineering groups (in particular) outsiders are welcome. Engineers are smart, creative and tolerant as a general rule. Lighten up. Who are you defending? and Who goes into Usenet with a thin skin? Expect ridicule, expect condemnation - water off a duck's back. You may think your viewpoint is the only one, the right one, the valid one - but a few million others may disagree. And you ain't started to deal with culture shock - some countries place emphasis on diplomacy _ you know the how are you? stuff, others don't, and seem very cold. Adapt. -- == Posted via Pronews.Com - Unlimited-Unrestricted-Secure Usenet News== http://www.pronews.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= - Total Privacy via Encryption =--- -- http://mail.python.org/mailman/listinfo/python-list
Docstrings for attributes?
Is there any way to attach a docstring to an attribute? I see that PEP-257 talks about attribute docstrings, but it references PDP-258, which was rejected. I suppose I could eschew plain attributes in favor of getter functions, because those give me a place to hang a docstring, but that feels like the wrong thing to do. -- http://mail.python.org/mailman/listinfo/python-list
what's difference usage?
while as I try to wrap a function using boost-python, I find a strange
situation.
#include iostream
#include string
#include vector
#include boost/python/list.hpp
#include boost/python.hpp
using namespace boost::python;
int printlist(list l){
std::vectorstd::string a;
a.push_back(c++);
a.push_back(javascript);
for (std::vectorstd::string::iterator p = a.begin(); p != a.end(); +
+p)
l.append(*p);
return 0;
}
BOOST_PYTHON_MODULE(wlist){
def(printlist, printlist);
}
in the up code,int printlist(list l) at first time I missed add
left of l. but when I run the following python code,
#!/usr/local/bin/python
a = list()
a.append('linux')
import wlist
wlist.printlist(a)
print a
they get the same result.
linux
c++
javascript
anyone help me figure out what's wrong here. thanks.
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Re: Docstrings for attributes?
On Sep 28, 11:50 am, Roy Smith [EMAIL PROTECTED] wrote: Is there any way to attach a docstring to an attribute? I see that PEP-257 talks about attribute docstrings, but it references PDP-258, which was rejected. I suppose I could eschew plain attributes in favor of getter functions, because those give me a place to hang a docstring, but that feels like the wrong thing to do. There were a couple of solutions provided - including the use of properties - when this question came up earlier this week: http://groups.google.com/group/comp.lang.python/browse_frm/thread/18a8c3f09ac02f85# -- http://mail.python.org/mailman/listinfo/python-list
Re: Borg vs Singleton vs OddClass
On Sat, 27 Sep 2008 11:12:00 -0700, Lie wrote: This is probably unrelated to Python, as this is more about design pattern. I'm asking your comments about this design pattern that is similar in functionality to Singleton and Borg: to share states. I'm thinking about this design pattern (I don't know if anyone has ever thought of this pattern before): class OddClass(object): def __init__(self): global OddClass OddClass = self def __call__(): return self I don't think that pattern works as you give it. I suggest you read the thread What do you call a class not intended to be instantiated, started by me on the 21st of September, which covers a similar pattern. I'm afraid it's a rather long thread, with a lot of people misunderstanding what I was asking, but still worth reading. If you only have time to read one post, I suggest you read my reply to Ben Finney, posted yesterday. My own feeling is that both your OddClass and my class without instances are probably solutions looking for a problem. Well, actually, no, that's too strong: I think the concept of Class Singleton is a perfectly valid solution to certain problems, but it competes with more well-known solutions like modules and Borg (in Python) and Singletons (the hammer available in Java and C++). As for which is better, that's partly a matter of personal taste and partly a matter of familiarity. It do have a problem though, that you can't do isinstance(a, OddClass) But you can say a is OddClass, which is more appropriate for a Singleton. The problem with Borg is that it is not inheritable (in certain sense[1]) and only work with old-style class (which is due to be completely removed on py3k)[2] No, there is a new-style Borg. Read the comments here: http://code.activestate.com/recipes/66531/ The new-style Borg is hardly more complicated than old-style: 6 lines versus 4. I like Luke Plant's comment: classes and modules are singletons. You don't need singletons in python simply because classes and modules are always singletons, and they are also first class objects. They can have everything instances have, and as import statements don't make copies there is only ever one of them. We don't need no stinkin' design patterns. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: What do you call a class not intended to be instantiated
On Sat, 27 Sep 2008 17:41:42 -0400, Terry Reedy wrote:
In 3.0, at least, one does not need a disk file to create a module.
import types
me = types.ModuleType('me') # type(__builtins__) works, no import
me
module 'me' (built-in)
me.a = 1
me.a
1
me.a + 1
2
Seems to work for Python 2.5 as well.
That said, a blank class is even easier, and the representation is
better.
And modules aren't callable. I've often thought they should be.
--
Steven
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Re: Hello boys!
On Sat, 27 Sep 2008 23:12:59 + (UTC), Cydrome Leader [EMAIL PROTECTED] wrote: In rec.crafts.metalworking Jim Thompson [EMAIL PROTECTED] wrote: On Sat, 27 Sep 2008 18:47:16 -0400, default [EMAIL PROTECTED] wrote: On Sat, 27 Sep 2008 14:56:07 -0700 (PDT), Milenko Stojadinovic Cvrcko [EMAIL PROTECTED] wrote: Hello, this is Milenko Stojadinovic from town Banjaluka, Bosnia and Herzegovina, also known as Cvrcko Does anyone know of any bars in town where I can swallow a bucket of cum? It can be either dog, horse or human cum. Also, does anyone know of any sex bars where people will shit in your mouth? I also like eating shit. Come to the US and park your mouth in front of George Bush - all the Bshit you can eat - and it keeps on coming! I have a buddy in Bosna - he's normal. Now you know why I blanket kill-file googlegroups. So you and everybody can talk about them nonstop? You're gone also ;-) ...Jim Thompson -- | James E.Thompson, P.E. |mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems |manus| | Phoenix, Arizona 85048Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com |1962 | Liberalism is a persistent vegetative state -- http://mail.python.org/mailman/listinfo/python-list
design pattern: MVC in python
Howdy, I am working on a small PC game by using pygame. Since there are many graphical objects to display and intensive user interactions, I would like to employ MVC pattern to keep the system maintainable. However, I cannot find a good article which discussing the general knowledge about MVC, especially: 1. How to decouple M-V-C? That is, which function should be assigned to which part. 2. How to communicate each other while keeping M-V-C decoupled? 3. Do I need to create Interface/Proxy class for each component? 4. What is the general principle for designing the interface of M-V-C? As my previous experience, if without special care on the principle, the MVC pattern would gradually become messy and the boundary between each component becomes unclear. Could you give me any advice? In addition, can we take the advantage of python language to make MVC easy-to-build and easy-to-use? Thank you in advance. -- ShenLei -- http://mail.python.org/mailman/listinfo/python-list
Re: Abstract Base Class register function
On Sep 27, 4:50 pm, Mikolai Fajer [EMAIL PROTECTED] wrote: I have been experimenting with the abc module in py3k and thought about using the register method of an ABC as a class decorator: code import abc class MyABC(metaclass=abc.ABCMeta): pass @MyABC.register class MySub(): pass /code This doesn't work because the register method returns None. It would be a fairly simple modification to have this work: code def register(cls, subclass): Register a virtual subclass of an ABC. ... etc ... return subclass /code What do people think of this behavior? It's probably better to just inherit from your metclass. register is really for use with extension types that implement an interface. -- -Mikolai Fajer- -- http://mail.python.org/mailman/listinfo/python-list
Re: is decorator the right thing to use?
George Sakkis wrote: It's funny how often you come with a better solution a few moments after htting send! The snippet above can (ab)use the decorator syntax so that it becomes: class A(Proxy): @ProxyMethod def bmethod(self): return self.b1 @ProxyMethod def bmethod2(self): return self.b2 That is outstanding! This code looks very clean to me (just a touch cryptic around declarations in A, but that was unavoidable anyway). Seems like the right way to read it would be bottom up (or is it only my mind so perverted?). By the looks of it - it does exactly what I needed with great number of possibilities behind it and is very lightweight and transparent. Now I regret I haven't come up with it myself :-D George, at this point I'm out of rugs - so no more rug pulling from under your feet for me. Now I'm going to apply all this knowledge to my code, see how that goes and come back with more questions later. Thank you (all) very much for a great discussion. This thread educated me quite a bit on descriptors and why one would need them, and decorators - just as subject line suggested, were not forgotten. -- http://mail.python.org/mailman/listinfo/python-list
closures and dynamic binding
Hello all, To me, this is a somewhat unintuitive behavior. I want to discuss the parts of it I don't understand. f= [ None ]* 10 for n in range( 10 ): ... f[ n ]= lambda: n ... f[0]() 9 f[1]() 9 I guess I can accept this part so far, though it took a little getting used to. I'm writing some code and found the following workaround, but I don't think it should give different results. Maybe I'm not understanding some of the details of closures. f= [ None ]* 10 for n in range( 10 ): ... f[ n ]= (lambda n: ( lambda: n ) )( n ) ... f[0]() 0 f[1]() 1 Which is of course the desired effect. Why doesn't the second one just look up what 'n' is when I call f[0], and return 9? -- http://mail.python.org/mailman/listinfo/python-list
how to make smtplib.SMTP('localhost') work on window xp
Hi,
I am trying to use python module smtplib to send my email out on
window xp (localhost).
import smtplib
server = smtplib.SMTP('localhost')
but I got the error information as follows:
Traceback (most recent call last):
File interactive input, line 1, in ?
File c:\python24\lib\smtplib.py, line 244, in __init__
(code, msg) = self.connect(host, port)
File c:\python24\lib\smtplib.py, line 311, in connect
(code, msg) = self.getreply()
File c:\python24\lib\smtplib.py, line 355, in getreply
raise SMTPServerDisconnected(Connection unexpectedly closed)
SMTPServerDisconnected: Connection unexpectedly closed
I am not sure what is wrong with it. Should I configure my window xp
somewhere to run smtplib.SMTP('localhost')?
Thanks in advance.
ouyang
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str() should convert ANY object to a string without EXCEPTIONS !
From python manual
str( [object])
Return a string containing a nicely printable representation of an
object. For strings, this returns the string itself. The difference
with repr(object) is that str(object) does not always attempt to
return a string that is acceptable to eval(); its goal is to return a
printable string. If no argument is given, returns the empty string,
''.
now we try this under windows:
str(u'\ue863')
Traceback (most recent call last):
File stdin, line 1, in module
UnicodeEncodeError: 'ascii' codec can't encode character u'\ue863' in
position 0
: ordinal not in range(128)
FAIL.
also almighty Linux
Python 2.3.4 (#1, Feb 6 2006, 10:38:46)
[GCC 3.4.5 20051201 (Red Hat 3.4.5-2)] on linux2
Type help, copyright, credits or license for more information.
str(u'\ue863')
Traceback (most recent call last):
File stdin, line 1, in ?
UnicodeEncodeError: 'ascii' codec can't encode character u'\ue863' in
position 0: ordinal not in range(128)
Python 2.4.4 (#2, Apr 5 2007, 20:11:18)
[GCC 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)] on linux2
Type help, copyright, credits or license for more information.
str(u'\ue863')
Traceback (most recent call last):
File stdin, line 1, in ?
UnicodeEncodeError: 'ascii' codec can't encode character u'\ue863' in
position 0: ordinal not in range(128)
Python 2.5 (release25-maint, Jul 20 2008, 20:47:25)
[GCC 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)] on linux2
Type help, copyright, credits or license for more information.
str(u'\ue863')
Traceback (most recent call last):
File stdin, line 1, in module
UnicodeEncodeError: 'ascii' codec can't encode character u'\ue863' in
position 0: ordinal not in range(128)
The problem is, why the f**k set ASCII encoding to range(128)
while str() is internally byte array it should be handled in
range(256) !!
http://bugs.python.org/issue3648
One possible solution(Windows Only)
str(u'\ue863'.encode('mbcs'))
'\xfe\x9f'
print u'\ue863'.encode('mbcs')
��
I now spending 60% of my developing time dealing with ASCII range(128)
errors. It was PAIN!!
Please fix this issue.
http://bugs.python.org/issue3648
Please.
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[issue3892] bsddb: test01_basic_replication fails on Windows sometimes
Amaury Forgeot d'Arc [EMAIL PROTECTED] added the comment: I reproduce the test failure very consistently, on both win2k and winXP, and may be of some help to test stuff. -- nosy: +amaury.forgeotdarc ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3892 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3187] os.listdir can return byte strings
Changes by STINNER Victor [EMAIL PROTECTED]: Removed file: http://bugs.python.org/file11189/filename.py ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3187 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3187] os.listdir can return byte strings
Changes by STINNER Victor [EMAIL PROTECTED]: Removed file: http://bugs.python.org/file11210/invalid_filename.patch ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3187 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3978] ZipFileExt.read() can be incredibly slow
Antoine Pitrou [EMAIL PROTECTED] added the comment: Very interesting, but it will have to wait for 2.7/3.1. 2.6 and 3.0 are in the final phases of the release process. -- nosy: +pitrou priority: - normal versions: +Python 3.1 -Python 2.6 ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3978 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3872] Python 2.6rc2: Tix ComboBox error
Martin v. Löwis [EMAIL PROTECTED] added the comment: Thanks for the patch. I have now integrated this patch into externals/tix-8.4.3.1 (along with a patch to compile it for AMD64). Demo installers including this code are available at http://www.dcl.hpi.uni-potsdam.de/home/loewis/u/python-2.6.14149.msi http://www.dcl.hpi.uni-potsdam.de/home/loewis/u/python-2.6.14149.amd64.msi I'm skeptical about the build_tkinter patch. It seems fairly invasive, so I'd rather defer it until after the release. -- priority: critical - normal resolution: - fixed ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3872 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3981] Python 3, IDLE does not start
New submission from bahiminin [EMAIL PROTECTED]: I have Windows XP with Live OneCare as protection. Python 3 IDLE won't start because of sub-process issues while Python 2.5.2 IDLE does start without any problem. -- messages: 73923 nosy: dah severity: normal status: open title: Python 3, IDLE does not start versions: Python 3.0 ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3981 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3665] Support \u and \U escapes in regexes
Changes by Jeffrey C. Jacobs [EMAIL PROTECTED]: -- nosy: +timehorse ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3665 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3482] re.split, re.sub and re.subn should support flags
Changes by Jeffrey C. Jacobs [EMAIL PROTECTED]: -- nosy: +timehorse ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3482 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3482] re.split, re.sub and re.subn should support flags
Changes by Jeffrey C. Jacobs [EMAIL PROTECTED]: -- versions: +Python 2.7, Python 3.1 -Python 2.6, Python 3.0 ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3482 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3299] invalid object destruction in re.finditer()
Changes by Jeffrey C. Jacobs [EMAIL PROTECTED]: -- versions: +Python 2.7 -Python 2.6 ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3299 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
