Re: os.wait() losing child?

Jason Zheng <[EMAIL PROTECTED]> writes: > Hrvoje Niksic wrote: >>> greg wrote: >> Actually, it's not that bad. _cleanup only polls the instances that >> are no longer referenced by user code, but still running. If you hang >> on to Popen instances, they won't be added to _active, and __init__ >>

Re: Function parameter type safety?

Robert Dailey a écrit : > Hi, > > Is there a way to force a specific parameter in a function to be a > specific type? No, and that's considered a GoodThing(tm). > For example, say the first parameter in a function of > mine is required to be a string. If the user passes in an integer, I > want

Question about PyDict_SetItemString

Does PyDict_SetItemString(pDict,"key",PyString_FromString("value")) cause memory leak? >From Google results, I find some source code write like that. But some code write like below: obj = PyString_FromString("value"); PyDict_SetItemString(pDict,"key",obj); Py_DECREF(obj); So, which one is corre

Re: Question about PyDict_SetItemString

lgx schrieb: > Does PyDict_SetItemString(pDict,"key",PyString_FromString("value")) > cause memory leak? You shouldn't use that at all. If you look at the sources, what SetItemString does is: create a Python string from the char* and call PyDict_SetItem() to put the new string in. So it is actually

Re: How to create new files?

Robert Dailey <[EMAIL PROTECTED]> writes: > class filestream: > def __init__( self, filename ): > self.m_file = open( filename, "rwb" ) [...] > So far, I've found that unlike with the C++ version of fopen(), the > Python 'open()' call does not create the file for you when opene

how to call bluebit...

helo... i'm so glad can join to this website... i want to ask.. how to import bluebit matrik calculator that result of singular value decomposition (SVD) in python programming.. thank's for your answer. -- View this message in context: http://www.nabble.com/how-to-call-bluebit...-tf4072919.

Re: Class decorators do not inherit properly

Chris Fonnesbeck a écrit : > I have a class that does MCMC sampling (Python 2.5) that uses decorators > -- one in particular called _add_to_post that appends the output of the > decorated method to a class attribute. > However, when I > subclass this base class, the decorator no longer works: >

Re: Class decorators do not inherit properly

Lee Harr a écrit : >> Traceback (most recent call last): >> File "/Users/chris/Projects/CMR/closed.py", line 132, in >> class M0(MetropolisHastings): >> File "/Users/chris/Projects/CMR/closed.py", line 173, in M0 >> @_add_to_post >> NameError: name '_add_to_post' is not defined >> >> y

Re: PEP 3107 and stronger typing (note: probably a newbie question)

Ben Finney <[EMAIL PROTECTED]> writes: > This is interesting. Do you have any references we can read about this > assertion -- specifically, that "GOTO" was not well loved (I assume > "by the programming community at large") even by around 1966? Dijkstra's famous 1968 "GOTO considered harmful"

Re: PEP 3107 and stronger typing (note: probably a newbie question)

John Nagle <[EMAIL PROTECTED]> writes: > Donn Cave wrote: > > In its day, goto was of course very well loved. > > No, it wasn't. By 1966 or so, "GOTO" was starting to look like a > bad idea. It was a huge hassle for debugging. This is interesting. Do you have any references we can read about th

Re: How to create new files?

Robert Dailey a écrit : > Hi, > > I'm trying to create a Python equivalent of the C++ "ifstream" class, > with slight behavior changes. > > Basically, I want to have a "filestream" object that will allow you to > overload the '<<' and '>>' operators to stream out and stream in data, > respectivel

Re: Fastest way to convert a byte of integer into a list

On Jul 12, 5:34 pm, Godzilla <[EMAIL PROTECTED]> wrote: > Hello, > > I'm trying to find a way to convert an integer (8-bits long for > starters) and converting them to a list, e.g.: > > num = 255 > numList = [1,1,1,1,1,1,1,1] > > with the first element of the list being the least significant, so >

Re: Getting values out of a CSV

>> > Note that every time you see [x for x in ...] with no condition, you >> can >> > write list(...) instead - more clear, and faster. >> > >> > data = list(csv.reader(open('some.csv', 'rb'))) >> >> Faster? No. List Comprehensions are faster. > > [EMAIL PROTECTED] pdfps $ python -m timeit -c 'da

Re: Fast powerset function

On 13 Jul 2007 02:25:59 -0700, Paul Rubin wrote > Antoon Pardon <[EMAIL PROTECTED]> writes: > > On 7/12/07, Arash Arfaee <[EMAIL PROTECTED]> wrote: > > > I need a powerset generator function. It's really slow with recursion. > > > Does > > > anybody have any idea or code(!!) to do it in an accepta

Re: MaildirMessage

Ben Finney wrote: > "Gabriel Genellina" <[EMAIL PROTECTED]> writes: > >> msg is an instance of MaildirMessage (subclass of Message) - it has >> no specific iterator, so "for m in msg" tries to use the sequence >> protocol, starting at 0; that is, tries to get msg[0]. Message >> objects support the

Re: The Modernization of Emacs: terminology buffer and keybinding

Twisted wrote: [on 7/7/07]: I don't know, but it sure as hell isn't emacs. Then, more recently: > On Jul 12, 7:10 pm, Miles Bader <[EMAIL PROTECTED]> wrote: >> Twisted <[EMAIL PROTECTED]> writes: >>> I won't dignify your insulting twaddle and random ad-hominem verbiage >>> with any more response

Re: scripts into wxPython

On Jul 13, 7:39 am, justme <[EMAIL PROTECTED]> wrote: > Hello > > I've been happily scripting away for the last few years (Matlab, now > Python) and all has been fine. Now I find myself scripting up code for > clients, but they all want a nice GUI. I've had a tinker with wxPython > and it all seems

Re: Getting values out of a CSV

On Fri, 13 Jul 2007 15:05:29 +0300, Daniel wrote: >>> > Note that every time you see [x for x in ...] with no condition, you >>> can >>> > write list(...) instead - more clear, and faster. >>> > >>> > data = list(csv.reader(open('some.csv', 'rb'))) >>> >>> Faster? No. List Comprehensions are fas

Re: web page text extractor

On Jul 13, 5:44 pm, Paul McGuire <[EMAIL PROTECTED]> wrote: > On Jul 12, 4:42 am, kublai <[EMAIL PROTECTED]> wrote: > > > Hello, > > > For a project, I need to develop a corpus of online news stories. I'm > > looking for an application that, given the url of a web page, "copies" > > the rendered t

Re: The Modernization of Emacs: terminology buffer and

Hullo, I was just wondering if this thread was whithering out.. I gues not for a good time. A short summary in the hope for the last posting in this topic. Some provocative posting caused or Twister brother to send a large amount of doubtful info. It seems, he had some very bad experience w

pytz giving incorrect offset and timezone

Hi All, I am facing some strange problem in pytz. The timezone "Asia/Calcutta" is actually IST, which is GMT + 5:30. But while using pytz, it is being recognized as HMT (GMT + 5:53). While I digged into the oslan database, I see the following: # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Asia/Ca

Writing a Python manual for Poser 7. Advice required re copyright/license

Hi Folks, I'm attempting to write a comprehensive manual explaining how to write Python scripts for the Poser 7 application. All the example scripts, explanatory paragraphs and screen shots will naturally be all my own work. My difficulty is in knowing how I may present the large amount of tabulat

Re: how to call bluebit...

> how to import bluebit matrik calculator that result of singular value > decomposition (SVD) in python programming.. I'm not really sure I understand you but you might want to check out scipy: http://scipy.org/ HTH, Daniel -- http://mail.python.org/mailman/listinfo/python-list

Re: Assignments to __class_ broken in Python 2.5?

(Yes, I probably should have said CPython in my subject, not Python. Sorry.) On Jul 13, 12:56 am, samwyse <[EMAIL PROTECTED]> wrote: > OK, in classobject.h, we find this: > > #define PyClass_Check(op) ((op)->ob_type == &PyClass_Type) > > That seems straightforward enough. And the relevant messag

Re: variable naming query

On 2007-07-12, Ben Finney <[EMAIL PROTECTED]> wrote: >> self.__myvariable > > Indicates to the reader that the attribute '__myvariable' is > not available by that name outside the object, and name > mangling is automatically done to discourage its use from > outside the object. >From _Python Refer

Re: diferent answers with isalpha()

On Jul 13, 6:07 am, Jyotirmoy Bhattacharya <[EMAIL PROTECTED]> wrote: > On Jul 13, 5:05 am, [EMAIL PROTECTED] wrote: > > > In Idle when I do print 'á'.isalpha() I get True. When I make and > > execute a script file with the same code I get False. > > > Why do I have diferent answers ? > > Non-ASCII

Re: bool behavior in Python 3000?

Miles a écrit : > On Jul 12, 8:37 pm, Alan Isaac <[EMAIL PROTECTED]> wrote: >> I do not like that bool(False-True) is True. > > I've never seen the "A-B" used to represent "A and not B", nor have I > seen any other operator used for that purpose in boolean algebra, > though my experience is limite

Re: bool behavior in Python 3000?

Steven D'Aprano a écrit : (snip) > It makes more sense to explicitly cast bools to ints s/cast bools to ints/build ints from bools/ AFAICT, there's no such thing as typecast in Python. -- http://mail.python.org/mailman/listinfo/python-list

Re: Getting values out of a CSV

Daniel wrote: > On Fri, 13 Jul 2007 08:51:25 +0300, Gabriel Genellina > <[EMAIL PROTECTED]> wrote: > >> Note that every time you see [x for x in ...] with no condition, you >> can write list(...) instead - more clear, and faster. > > Faster? No. List Comprehensions are faster. Why do you think

Re: web page text extractor

On Jul 12, 4:42 am, kublai <[EMAIL PROTECTED]> wrote: > Hello, > > For a project, I need to develop a corpus of online news stories. I'm > looking for an application that, given the url of a web page, "copies" > the rendered text of the web page (not the source HTNL text), opens a > text editor (N

Re: PEP 3107 and stronger typing (note: probably a newbie question)

John Nagle schrieb: > Chris Mellon wrote: >> You can't prove a program to be correct, in the sense that it's proven >> to do what it's supposed to do and only what it's supposed to do. > > Actually, you can prove quite a bit about programs with the right > tools. > For example, proving that a

Re: Tool for finding external dependencies

On Jul 9, 3:39 am, Rob Cakebread <[EMAIL PROTECTED]> wrote: > Hi, > > I need to find external dependencies for modules (not Python standard > library imports). > > Currently I usepylintand manually scan the output, which is very > nice, or usepylint's--ext-import-graph option to create a .dot file

Re: Fast powerset function

On 7/12/07, Arash Arfaee <[EMAIL PROTECTED]> wrote: > I need a powerset generator function. It's really slow with recursion. Does > anybody have any idea or code(!!) to do it in an acceptable time? > Thanks My idea would be the following. 1) Turn your set into a list: lst 2) let lng be the numbe

Re: Class decorators do not inherit properly

Chris Fonnesbeck schrieb: > I have a class that does MCMC sampling (Python 2.5) that uses decorators > -- one in particular called _add_to_post that appends the output of the > decorated method to a class attribute. However, when I > subclass this base class, the decorator no longer works: > >

Re: Question about PyDict_SetItemString

lgx schrieb: > Does PyDict_SetItemString(pDict,"key",PyString_FromString("value")) > cause memory leak? > >>From Google results, I find some source code write like that. But some > code write like below: > > obj = PyString_FromString("value"); > PyDict_SetItemString(pDict,"key",obj); > Py_DECREF

Re: how to install pygame package?

> Im working in red hat linux 9.0. I've downloaded the pygame package > but i dont know how to install it. If anybody has the time to detail > the steps sequentially... thanx! > > P.S. I've downloaded both the tar and the rpm packages... First you can try the rpm package: su (give the root passwo

Re: PEP 3107 and stronger typing (note: probably a newbie question)

On 2007-07-13, Hendrik van Rooyen <[EMAIL PROTECTED]> wrote: > "Donn Cave" <[EMAIL PROTECTED]> wrote: > >>In its day, goto was of course very well loved. > > Does anybody know for sure if it is in fact possible to > design a language completely free from conditional jumps? I think you have to be m

Re: PEP 3107 and stronger typing (note: probably a newbie question)

On Fri, 13 Jul 2007 08:37:00 +0200, Hendrik van Rooyen wrote: > "Donn Cave" <[EMAIL PROTECTED]> wrote: > >>In its day, goto was of course very well loved. > > Does anybody know for sure if it is in fact possible to > design a language completely free from conditional jumps? GOTO is unconditiona

Re: Fast powerset function

Antoon Pardon <[EMAIL PROTECTED]> writes: > On 7/12/07, Arash Arfaee <[EMAIL PROTECTED]> wrote: > > I need a powerset generator function. It's really slow with recursion. Does > > anybody have any idea or code(!!) to do it in an acceptable time? > My idea would be the following. ... > 3) let n rang

Re: Getting values out of a CSV

On 7/12/07, Daniel <[EMAIL PROTECTED]> wrote: > On Fri, 13 Jul 2007 08:51:25 +0300, Gabriel Genellina > <[EMAIL PROTECTED]> wrote: > >> data = [row for row in csv.reader(open('some.csv', 'rb')) > > > > Note that every time you see [x for x in ...] with no condition, you can > > write list(...) inst

Re: Function parameter type safety?

In article <[EMAIL PROTECTED]>, Robert Dailey <[EMAIL PROTECTED]> wrote: > Hi, > > Is there a way to force a specific parameter in a function to be a > specific type? For example, say the first parameter in a function of > mine is required to be a string. If the user passes in an integer, I > wa

Re: patching pylint.el

On Jul 9, 4:13 pm, lgfang <[EMAIL PROTECTED]> wrote: > Hi, > > I think this is a bug ofpylint.el. But I failed finding a way to > submit the bug neither in its official site nor in google. So I post > it here wishing it may be useful for some buddies. > > The bug is that it uses "compile-internal

Re: Function parameter type safety?

Good replies. I'm in the process of learning Python. I'm a native C++ programmer, so you can see how the question relates. There's a lot of cool things C++ allowed you to do with type-checking, such as function overloading. With templates + type checking, I can create a STD version of ifstream/ of

Re: Question about PyDict_SetItemString

lgx <[EMAIL PROTECTED]> writes: >From Google results, I find some source code write like that. But >some code write like below: > > obj = PyString_FromString("value"); > PyDict_SetItemString(pDict,"key",obj); > Py_DECREF(obj); > > So, which one is correct? The latter is correct. While PyDict_Ge

Re: MaildirMessage

> Which is a bug in the 'email.message' module, in my view. If it's > attempting to support a mapping protocol, it should allow iteration > the same way standard Python mappings do: by iterating over the keys. I thought it is a bug as well, but who am I a python newbie to say so. I found inspect.g

Re: Fast powerset function

On Fri, 2007-07-13 at 08:15 -0400, I wrote: > [...] > def recursive_powerset(s): > if not s: yield set() > for x in s: > s2 = s - set([x]) > for subset in recursive_powerset(s2): > yield subset > for subset in recursive_powerset(s2): > yield s

scripts into wxPython

Hello I've been happily scripting away for the last few years (Matlab, now Python) and all has been fine. Now I find myself scripting up code for clients, but they all want a nice GUI. I've had a tinker with wxPython and it all seems standard enough but I was wondering if anyone has any comments a

Re: How to create new files?

On Jul 13, 3:04 am, Bruno Desthuilliers wrote: > Robert Dailey a écrit : > > > Hi, > > > I'm trying to create a Python equivalent of the C++ "ifstream" class, > > with slight behavior changes. > > > Basically, I want to have a "filestream" object that will allow you to > > overload the '<<' and '>

Re: How to create new files?

On Jul 13, 5:14 am, Robert Dailey <[EMAIL PROTECTED]> wrote: > Hi, > > I'm trying to create a Python equivalent of the C++ "ifstream" class, > with slight behavior changes. > > Basically, I want to have a "filestream" object that will allow you to > overload the '<<' and '>>' operators to stream ou

Re: bool behavior in Python 3000?

On Jul 11, 5:36 am, Bjoern Schliessmann wrote: > Is there any type named "bool" in standard Python? check this out. >>> doespythonrock = True >>> print type(doespythonrock) >>> -- ahlongxp Software College,Northeastern University,China [EMAIL PROTECTED] http://www.herofit.cn -- http://mail

Re: os.wait() losing child?

Hrvoje Niksic wrote: > Jason Zheng <[EMAIL PROTECTED]> writes: > >> Hrvoje Niksic wrote: greg wrote: >>> Actually, it's not that bad. _cleanup only polls the instances that >>> are no longer referenced by user code, but still running. If you hang >>> on to Popen instances, they won't be add

Re: access to the namespace of a function from within its invocation

Poor Yorick a écrit : > In the example below, the attribute "data" is added to a function > object. "me" can be used to get the function when it is invoked using > an identifier that matches the "co_name" attribute of function's code > object. Can anyone conjure an example of accessing fun2.da

Re: Function parameter type safety?

On Jul 13, 4:53 pm, Robert Dailey <[EMAIL PROTECTED]> wrote: > Good replies. > > I'm in the process of learning Python. I'm a native C++ programmer, so > you can see how the question relates. There's a lot of cool things C++ > allowed you to do with type-checking, such as function overloading. Thi

Re: How to create new files?

Robert Dailey a écrit : > On Jul 13, 3:04 am, Bruno Desthuilliers [EMAIL PROTECTED]> wrote: (snip) > Thanks for the variable naming tips. Is it normal for Python > programmers to create class members with a _ prefixed? This is the convention to denote implementation attributes. This won't of cou

permission denied in shutil.copyfile

Is there any way to copy a file from src to dst if the dst is exclusively open by other users. I am using src = 'c:\mydata\data\*.mdb' dst = 'v:\data\all\*.mdb' shutil.copyfile(src,dst) but getting error message permission denied. Any help is highly appreciated. Thanks sh -- http://mail.py

Tibco Rendezvous

Has anyone found or written a Tibco Rendezvous (tibrv) module for Python? I've only found some really old ones with German documentation and not updated since some time around 2000. -- http://mail.python.org/mailman/listinfo/python-list

Re: web page text extractor

To maintain paragraphs, replace any p or br tags with your favorite operating system's crlf. On Jul 13, 8:57 am, kublai <[EMAIL PROTECTED]> wrote: > On Jul 13, 5:44 pm, Paul McGuire <[EMAIL PROTECTED]> wrote: > > > > > On Jul 12, 4:42 am, kublai <[EMAIL PROTECTED]> wrote: > > > > Hello, > > > > Fo

Can a low-level programmer learn OOP?

Hi: From what I've read of OOP, I don't get it. I have also found some articles profoundly critical of OOP. I tend to relate to these articles. However, those articles were no more objective than the descriptions of OOP I've read in making a case. Ie., what objective data/studies/research

Re: Understanding python functions - Instant Python tutorial

Gabriel Genellina wrote: > En Thu, 12 Jul 2007 21:51:08 -0300, Chris Carlen > <[EMAIL PROTECTED]> escribió: >> http://hetland.org/writing/instant-python.html >> I don't understand Hetland's terminology though, when he is speaking of >> "binding" and "reference." Actually, Hetland's entire first

sys.exit versus termination of source code

Hi, I am playing with the atexit module but I don't find a way to see the difference between a script calling sys.exit() and the interpreting arriving at the end of the source code file. This has a semantic difference for my applications. Is there a way to determine in an exithandler (that i

Re: Getting values out of a CSV

On Fri, 13 Jul 2007 16:18:38 +0300, Marc 'BlackJack' Rintsch <[EMAIL PROTECTED]> wrote: >> $ python -m timeit -c 'import csv; data = >> list(csv.reader(open("some.csv", >> "rb")))' >> 1 loops, best of 3: 44 usec per loop >> $ python -m timeit -c 'import csv; data = [row for row in >> csv.re

Re: Circular import problem

> Seehttp://effbot.org/zone/import-confusion.htm > Try to move the circular references later in the code (maybe inside a > function, when it is required), or much better, refactor it so there is no > circularity. > > -- > Gabriel Genellina Yes, thanks. I'd read that page before posting. Helpful.

how to implementation latent semantic indexing in python..

hi... how to implementation algorithm latent semantic indexing in python programming...?? thank's for daniel who answered my question before.. -- View this message in context: http://www.nabble.com/how-to-implementation-latent-semantic-indexing-in-python..-tf4075439.html#a11582773 Sent from th

Re: Can a low-level programmer learn OOP?

On Fri, 13 Jul 2007 09:06:44 -0700, Chris Carlen wrote: > Perhaps the only thing that may have clicked regarding OOP is that in > certain cases I might prefer a higher-level approach to tasks which > involve dynamic memory allocation. If I don't need the execution > efficiency of C, then OOP m

Re: Understanding python functions - Instant Python tutorial

Chris Carlen wrote: > Let's go back the statement: > > x = [1,2,3] > > Do we then say: "[1,2,3] is x" or is it the other way around: "x is > [1,2,3]" ??? > This will yield 'False', because 'is' checks for *identity* not equality. In your case you assign a list the name 'x' and then check (via

Re: Problem with Python's "robots.txt" file parser in module robotparser

In article <[EMAIL PROTECTED]>, John Nagle <[EMAIL PROTECTED]> wrote: >I asked over at Webmaster World, and over there, they recommend against > using redirects on robots.txt files, because they questioned whether all of > the major search engines understand that. Does a redirect for > "foo

Re: Understanding python functions - Instant Python tutorial

Ben Finney wrote: > Chris Carlen <[EMAIL PROTECTED]> writes: > > def change(some_list): > some_list[1] = 4 > > x = [1,2,3] > change(x) > print x # Prints out [1,4,3] > --- > def nochange(x): > x = 0 > > y = 1 > nochange(y) > print y # Prints out 1 > >>I don't understand Hetland's

Re: Understanding python functions - Instant Python tutorial

Wildemar Wildenburger wrote: > x = [1, 2, 3] > y = [1, 2, 3] > id(x), id(y) > x == y > x is y > Ooops! Make that: x = [1, 2, 3] y = [1, 2, 3] id(x); id(y) x == y x is y (had to be a semicolon there) -- http://mail.python.org/mailman/listinfo/python-list

Re: Can a low-level programmer learn OOP?

Chris Carlen wrote: > Hi: > > From what I've read of OOP, I don't get it. I have also found some > articles profoundly critical of OOP. I tend to relate to these articles. > > However, those articles were no more objective than the descriptions of > OOP I've read in making a case. Ie., what

Re: Re-raising exceptions with modified message

On Jul 13, 12:45 am, Christoph Zwerschke <[EMAIL PROTECTED]> wrote: > samwyse wrote: > > TypeError: __class__ must be set to a class > > > Excpt ceratinly appears to be a class. Does anyone smarter than me > > know what's going on here? > > Not that I want to appear smarter, but I think the proble

Re: os.wait() losing child?

Jason Zheng <[EMAIL PROTECTED]> writes: >>> Nope it still doesn't work. I'm running python 2.4.4, tho. >> That explains it, then, and also why greg's code didn't work. You >> still have the option to try to run 2.5's subprocess.py under 2.4. > Is it more convenient to just inherit the Popen class

renaming an open file in nt like unix?

Hi. I'm writing an archival system which I'd like to be portable to Windows. The system relies on the property of Unix which allows a process to keep a file open even if another process renames it while it is open. Neither process sees any anomaly or error. Do the NT file systems support this f

Re: patching pylint.el

> "syt" == syt <[EMAIL PROTECTED]> writes: syt> fyi, pylint related bug should be reported on the python- syt> [EMAIL PROTECTED] mailing list. I've opened a ticket for syt> your bug/patch: http://www.logilab.org/bug/eid/4026 Thank you, Sylvain Fanglungang (fang.lungang at gmail)

Re: renaming an open file in nt like unix?

[EMAIL PROTECTED] schrieb: > Hi. I'm writing an archival system which I'd like to be portable > to Windows. > > The system relies on the property of Unix which allows a > process to keep a file open even if another process renames > it while it is open. Neither process sees any anomaly or > erro

CTypes FAQs - buffer memmove offsetof uchar ((void *) -1) etc.

http://wiki.python.org/moin/ctypes now tries to answer: '''FAQ: How do I copy bytes to Python from a ctypes.Structure?''' '''FAQ: How do I copy bytes to a ctypes.Structure from Python?''' '''FAQ: Why should I fear using ctypes.memmove?''' '''FAQ: How do I change the byte length of a ctypes.Structu

Re: Understanding python functions - Instant Python tutorial

On 7/13/07, Chris Carlen <[EMAIL PROTECTED]> wrote: > Ben Finney wrote: > > Chris Carlen <[EMAIL PROTECTED]> writes: > > That's not how Python works. Every value is an object; the assignment > > operator binds a name to an object. This is more like writing the name > > on a sticky-note, and sticki

Re: Fast powerset function

On Jul 13, 6:34 pm, Carsten Haese <[EMAIL PROTECTED]> wrote: > def recursive_powerset(s): > if not s: yield set() > for x in s: > s2 = s - set([x]) > for subset in recursive_powerset(s2): > yield subset > yield subset.union(set([x])) > Your recursive_

RE: Tibco Rendezvous

Circa summer 2003, at a company I previously worked at, a co-worker and I had an occasion to see if we could get Python and TIBCO Rendezvous working together. The SWIG-based tibrv mechanism was insufficient, buggy and was problematic in terms of keeping up with Python releases. We resorted to u

NoneType object not iterable

Hi! My code is > db = {} > > def display(): > keyList = db.keys() > sortedList = keyList.sort() > for name in sortedList: > line = 'Name: %s, Number: %s' % (name, db[name]) > print line.replace('\r', '') And it gives following error: > for name in sortedList: >

Re: Fast powerset function

On Fri, 2007-07-13 at 17:38 +, Jyotirmoy Bhattacharya wrote: > On Jul 13, 6:34 pm, Carsten Haese <[EMAIL PROTECTED]> wrote: > > def recursive_powerset(s): > > if not s: yield set() > > for x in s: > > s2 = s - set([x]) > > for subset in recursive_powerset(s2): > >

Re: NoneType object not iterable

[EMAIL PROTECTED] schrieb: > Hi! > My code is > > > db = {} > > > >> def display(): >> keyList = db.keys() >> sortedList = keyList.sort() >> for name in sortedList: >> line = 'Name: %s, Number: %s' % (name, db[name]) >> print line.replace('\r', '') > > > And it giv

Re: Can a low-level programmer learn OOP?

Chris, I can fully relate to your post. I trained as a programmer in the 80s when OOP was an accademic novelty, and didn't learn OOP untill around 2002. However now I find myself naturaly thinking in OOP terms, although I'm by no means an expert - I'm a sysadmin that writes the occasional utility.

Re: Can a low-level programmer learn OOP?

Sorry, here's the tutorial link: http://hetland.org/writing/instant-python.html Simon Hibbs -- http://mail.python.org/mailman/listinfo/python-list

Re: Can a low-level programmer learn OOP?

John Nagle wrote: > Chris Carlen wrote:[edit] >> Hence, being a hardware designer rather than a computer scientist, I >> am conditioned to think like a machine. I think this is the main >> reason why OOP has always repelled me. > > Why? When pointers were first explined to me, I went "Ok."

Re: NoneType object not iterable

Daniel wrote: > db is out of scope, you have to pass it to the function: What's wrong about module attributes? Regards, Björn -- BOFH excuse #418: Sysadmins busy fighting SPAM. -- http://mail.python.org/mailman/listinfo/python-list

Re: 2**2**2**2**2 wrong? Bug?

On Mon, 09 Jul 2007 23:51:25 -0700, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote: >On Jul 9, 11:42?pm, Paul McGuire <[EMAIL PROTECTED]> wrote: >> On Jul 9, 11:21 pm, "Jim Langston" <[EMAIL PROTECTED]> wrote:> In Python 2.5 >> on intel, the statement >> > 2**2**2**2**2 >> > evaluates to>>> 2**2**

Re: Fast powerset function

On 7/12/07, Arash Arfaee <[EMAIL PROTECTED]> wrote: > I need a powerset generator function. It's really slow with recursion. Does > anybody have any idea or code(!!) to do it in an acceptable time? > Thanks > -Arash Here's a much simpler (and faster) solution I got from a coworker: s = range(18)

Re: Understanding python functions - Instant Python tutorial

On Fri, 13 Jul 2007 18:49:06 +0200, Wildemar Wildenburger <[EMAIL PROTECTED]> wrote: >Wildemar Wildenburger wrote: >> x = [1, 2, 3] >> y = [1, 2, 3] >> id(x), id(y) >> x == y >> x is y >> >Ooops! > >Make that: > >x = [1, 2, 3] >y = [1, 2, 3] >id(x); id(y) >x == y >x is y > >(had to be a semicol

Re: NoneType object not iterable

On Fri, 13 Jul 2007 20:44:13 +0300, <[EMAIL PROTECTED]> wrote: > > Hi! > My code is > > > db = {} > > >> def display(): >> keyList = db.keys() >> sortedList = keyList.sort() >> for name in sortedList: >> line = 'Name: %s, Number: %s' % (name, db[name]) >> print line.r

Re: NoneType object not iterable

On Fri, 13 Jul 2007 21:13:20 +0300, Bjoern Schliessmann <[EMAIL PROTECTED]> wrote: > > Daniel wrote: > >> db is out of scope, you have to pass it to the function: > > What's wrong about module attributes? > I made a mistake -- http://mail.python.org/mailman/listinfo/python-list

Re: NoneType object not iterable

Stargaming <[EMAIL PROTECTED]> writes: > It does not turn into something. The `sort()` method just works "in > place", i. e. it will mutate the list it has been called with. It > returns None (because there is no other sensible return value). > > For you, that means: You don't have to distinguish

Re: Understanding python functions - Instant Python tutorial

Chris Mellon wrote: > On 7/13/07, Chris Carlen <[EMAIL PROTECTED]> wrote: >> Ben Finney wrote: >>> Chris Carlen <[EMAIL PROTECTED]> writes: > >>> That's not how Python works. Every value is an object; the assignment >>> operator binds a name to an object. This is more like writing the name >>> on

A Python newbie ask a simple question

what does the statement "choice = raw_input(prompt)[0]" mean? I don't know why there is a '[0]' in the statement. Thank you very much -- http://mail.python.org/mailman/listinfo/python-list

Re: renaming an open file in nt like unix?

Thomas Heller wrote: > [EMAIL PROTECTED] schrieb: >> Hi. I'm writing an archival system which I'd like to be portable >> to Windows. >> >> The system relies on the property of Unix which allows a >> process to keep a file open even if another process renames >> it while it is open. Neither proces

Re: sys.exit versus termination of source code

Carl DHalluin wrote: > Hi, > > > > I am playing with the atexit module but I don’t find a way to see the > difference > > between a script calling sys.exit() and the interpreting > arriving at the end > > of the source code file. This has a semantic difference for my applications. > > Is t

Re: A Python newbie ask a simple question

The raw_input built-in returns a string. The '[0]' subscript returns the first character in the user supplied response as strings support indexing. [GCC 4.0.1 (Apple Computer, Inc. build 5341)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> mystr = "asdf" >>>

Re: PEP 3107 and stronger typing (note: probably a newbie question)

In article <[EMAIL PROTECTED]>, Paul Rubin wrote: > Ben Finney <[EMAIL PROTECTED]> writes: > > This is interesting. Do you have any references we can read about this > > assertion -- specifically, that "GOTO" was not well loved (I assume > > "by the programming communit

Re: 2**2**2**2**2 wrong? Bug?

On Jul 13, 1:20 pm, Wayne Brehaut <[EMAIL PROTECTED]> wrote: > On Mon, 09 Jul 2007 23:51:25 -0700, "[EMAIL PROTECTED]" > > > > > > <[EMAIL PROTECTED]> wrote: > >On Jul 9, 11:42?pm, Paul McGuire <[EMAIL PROTECTED]> wrote: > >> On Jul 9, 11:21 pm, "Jim Langston" <[EMAIL PROTECTED]> wrote:> In Python

Re: Can a low-level programmer learn OOP?

On 7/13/07, John Nagle <[EMAIL PROTECTED]> wrote: > You can sometimes get better performance in C++ than in C, because C++ > has "inline". Inline expansion happens before optimization, so you > can have abstractions that cost nothing. This is a bit off topic, but inline is a keyword in C sin

Numpy array index handling

Being a Matlab user wanting to switch to Python/SciPy, I'd like to know how the following Matlab code would be written in Python: % First, just some artificial data N = 100 ; input = sign(randn(1, N)) ; a = (1 : N) ; % This is what I'd like to do; % for indices where the input has a certain va

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