Jython 2.5.0 Final is out!
On behalf of the Jython development team, I'm pleased to announce that Jython 2.5.0 final is available for download: http://downloads.sourceforge.net/jython/jython_installer-2.5.0.jar see the installation instructions: http://wiki.python.org/jython/InstallationInstructions Jython 2.5.0 brings us up to language level compatibility with the 2.5 version of CPython. This release has had a strong focus on CPython compatibility, and so this release of Jython can run more pure Python apps then any previous release. Please see the NEWS file for detailed release notes. I want to thank all of the amazing people who have contributed in large and small ways to this important Jython release. For the first time in a long time we have Jython that is a modern version of Python. Enjoy! Please report any bugs that you find: http://bugs.jython.org Thanks! -Frank -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
[ANN] first full alpha release of PyLab_Works v0.3
hello, I am pleased to announce the first full alpha release of PyLab_Works, v0.3. PyLab_Works is a modular Visual Development Environment, based on data-flow programming technics. PyLab_Works is specially aimed at Education, Engineering and Science. The ideas behind PyLab_Works are, that the final user should not be burdened with programming details and domain details, whereas the domain expert should be able to implement the specific domain knowledge without being a full educated programmer. You can always find my notes on PyLab_Works on http://pic.flappie.nl Most of these pages are also collected in a single pdf document, which can be found here: http://pylab-works.googlecode.com/files/pw_manual.pdf The source code and a one-button-Windows-Installer can be found on codegoogle: http://code.google.com/p/pylab-works/ The files are rather large, because they contain some data samples. The Windows-Installer contains everything you need to get started with PyLab_Works: ConfigObj, gprof2dot, HTTPlib, MatPlotLib, Numpy, Pickle, Psyco, pyclbr, PyGame, PyLab_Works, PyODBC, Python, RLCompleter, Scipy, Sendkeys, SQLite3, SQLObject, URLparse, wave, Visual, win32*, wxPython. Although the PyLab_Works programs are compiled with Py2Exe, all the source files are explicitly included. have fun, Stef Mientki -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
Sphinx 0.6.2 released
Hi all, I'm proud to announce the release of Sphinx 0.6.2, which is a bugfix-only release in the 0.6 series. What is it? === Sphinx is a tool that makes it easy to create intelligent and beautiful documentation for Python projects (or other documents consisting of multiple reStructuredText source files). Website: http://sphinx.pocoo.org/ What's new in 0.6.2 (short version)? Over 25 bugs and problems have been fixed. The full list is at http://sphinx.pocoo.org/changes.html. cheers, Georg -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
py-postgresql 0.9 Released: Speed Query Libraries
I'm pleased to announce the release of py-postgresql 0.9.0 and 0.8.2. py-postgresql is a Python programmer's client (driver) for PostgreSQL and general toolkit for working with PostgreSQL in Python. http://python.projects.postgresql.org/?utm_source=releaseutm_medium=emailutm_campaign=py-postgresql-0.9.0 Changes in 0.9: * Performance Improvements. Always nice. =) * Query Libraries--statement management. * Display of line and relative location of the POSITION for syntax errors. * DB-API now extends PG-API. * Many under-the-hood improvements. Special thanks to the following bug reporters: Mike Bayer [Broken DB-API row counts] Dallas Morisett [Broken procedure reference generation] ... Bugs, while of crunchy consistency, are fearlessly squashed. ... If you find a bug, a report would be greatly appreciated. http://pgfoundry.org/tracker/?atid=442group_id=194 -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
ANN: pdfrecycle 0.05
I'm happy to announce pdfrecycle 0.05 Get it at http://www.florian-diesch.de/software/pdfrecycle/ pdfrecycle creates a PDF file by composing pages from other PDF files. It can add PDF bookmarks and metadata, scale, rotate and crop pages and put multiple logical pages onto each physical sheet. pdfrecycle uses a simple text file format to define the layout and what pages to include. From this input file pdfrecycle creates a LaTeX file and then runs pdflatex to produced the PDF file. With version 0.05 you can put pages of different input files on one output sheet and/or cut of parts of input pages. Florian -- http://www.florian-diesch.de/ -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
Re: walking a directory with very many files
In message 20090617091858.432f8...@malediction, Mike Kazantsev wrote: On Wed, 17 Jun 2009 14:52:28 +1200 Lawrence D'Oliveiro l...@geek-central.gen.new_zealand wrote: In message 234b19ac-7baf-4356-9fe5-37d00146d...@z9g2000yqi.googlegroups.com, thebjorn wrote: Not proud of this, but...: [django] www4:~/datakortet/media$ ls bfpbilder|wc -l 174197 all .jpg files between 40 and 250KB with the path stored in a database field... *sigh* Why not put the images themselves into database fields? Oddly enough, I'm a relieved that others have had similar folder sizes ... One of my past projects had 40-odd files in a single folder. They were movie frames, to allow assembly of movie sequences on demand. For both scenarios: Why not use hex representation of md5/sha1-hashed id as a path, arranging them like /path/f/9/e/95ea4926a4 ? That way, you won't have to deal with many-files-in-path problem ... Why is that a problem? -- http://mail.python.org/mailman/listinfo/python-list
Re: Measuring Fractal Dimension ?
Jaime Fernandez del Rio jaime.f...@gmail.com writes: I am pretty sure that a continuous sequence of curves that converges to a continuous curve, will do so uniformly. I think a typical example of a curve that's continuous but not uniformly continuous is f(t) = sin(1/t), defined when t 0 It is continuous at every t0 but wiggles violently as you get closer to t=0. You wouldn't be able to approximate it by sampling a finite number of points. A sequence like g_n(t) = sin((1+1/n)/ t)for n=1,2,... obviously converges to f, but not uniformly. On a closed interval, any continuous function is uniformly continuous. -- http://mail.python.org/mailman/listinfo/python-list
Re: Exceptions and Object Destruction (was: Problem with apsw and garbage collection)
Lawrence D'Oliveiro l...@geek-central.gen.new_zealand writes: Reference counting is an implementation detail used by CPython but not [implementations built on runtimes designed for corporate-herd-oriented languages, like] IronPython or Jython. I rest my case. You're really being pretty ignorant. I don't know of any serious Lisp system that uses reference counting, both for performance reasons and to make sure cyclic structures are reclaimed properly. Lisp is certainly not a corporate herd language. Even CPython doesn't rely completely on reference counting (it has a fallback gc for cyclic garbage). Python introduced the with statement to get away from the kludgy CPython programmer practice of opening files and relying on the file being closed when the last reference went out of scope. -- http://mail.python.org/mailman/listinfo/python-list
Re: parsing json using simplejson
deostroll deostr...@gmail.com wrote: I want to be able to parse it into python objects. Any ideas? What did you not like about the very useful replies you have already received? -- Tim Roberts, t...@probo.com Providenza Boekelheide, Inc. -- http://mail.python.org/mailman/listinfo/python-list
Re: Exceptions and Object Destruction (was: Problem with apsw and garbage collection)
On Wed, 17 Jun 2009 17:52:30 +1200, Lawrence D'Oliveiro wrote: In message pan.2009.06.16.07.34...@remove.this.cybersource.com.au, Steven D'Aprano wrote: On Tue, 16 Jun 2009 16:45:43 +1200, Lawrence D'Oliveiro wrote: In message m2eitowaf2@cs.uu.nl, Piet van Oostrum wrote: The exact time of the destruction of objects is an implementation detail and should not be relied upon. That may be true in Java and other corporate-herd-oriented languages, but we know that dynamic languages like Perl and Python make heavy use of reference-counting wherever they can. If it's easy to satisfy yourself that the lifetime of an object will be delimited in this way, I don't see why you can't rely upon it. Reference counting is an implementation detail used by CPython but not [implementations built on runtimes designed for corporate-herd-oriented languages, like] IronPython or Jython. I rest my case. CLPython and Unladen Swallow do not use reference counting. I suppose you might successfully argue that Lisp is a corporate-herd-oriented language, and that Google (the company behind Unladen Swallow) is a corporate-herd. But PyPy doesn't use reference counting either. Perhaps you think that Python is a language designed for corporate-herds too? -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: How to get the total size of a local hard disk?
willgun will...@live.cn wrote: Unfortunately,I'm on win32. Actually,I prefer a cross-platform method. Why do you need this? This kind of information is not very useful in a cross-platform application. -- Tim Roberts, t...@probo.com Providenza Boekelheide, Inc. -- http://mail.python.org/mailman/listinfo/python-list
Re: question about a command like 'goto ' in Python's bytecode or it's just a compiler optimization?
higer schrieb: My Python version is 2.5.2; When I reading the bytecode of some pyc file, I always found that there are many jump command from different position,but to the same position. You can see this situation in following code(this bytecode is just from one .pyc file and I don't have its source .py file): . 526 POP_TOP '' 527 LOAD_FAST 'imeHandle' 530 LOAD_ATTR 'isCnInput' 533 CALL_FUNCTION_0 '' 536 JUMP_IF_FALSE '574' 539 POP_TOP '' 540 LOAD_FAST 'GUIDefine' 543 LOAD_ATTR 'CandidateIsOpen' 546 JUMP_IF_TRUE '574' 549 POP_TOP '' 550 LOAD_FAST 'GUIDefine' 553 LOAD_ATTR 'CompositionWndIsOpen' 556 JUMP_IF_TRUE '574' 559 POP_TOP '' 560 LOAD_FAST 'isWanNengWB' 563 JUMP_IF_FALSE '574' 566 POP_TOP '' 567 LOAD_FAST 'state' 570 LOAD_CONST1 573 BINARY_AND'' 574_0 COME_FROM '' 574_1 COME_FROM '' 574_2 COME_FROM '' 574_3 COME_FROM '' ... From the above bytecode,we know that line 574 is the point that many position jumps to.So,it just looks like the 'goto' function in C, but we know that there is none such function in Python. One 'JUMP**' command is companied with a 'COME_FROM' command,so more than one 'COME_FROM' OPs are listed on line 574... But ,the question is, I have tried a lot of ways(e.g.for loop,while loop and mixed) to re-present 'goto' style bytecodes like this, but the result depressed me. So,I think maybe it is just a compiler optimization in Python2.5? I'm not sure,so I'm appreciated that if anyone can help me. Getting a depression because of a compiler is a bit strong... However, yes, bytecode is similar to assembler, and in that respect higher-level control-structures are created using (conditional) jumps. The same is true for other bytecode-languages, see here for the JVM: http://java.sun.com/docs/books/jvms/second_edition/html/Overview.doc.html#6493 Diez -- http://mail.python.org/mailman/listinfo/python-list
Managing a multiple threaded service
Hi,
New to Python
I've got 2 threads 1 is the SimpleHTTPRequestHandler, the other polls a site
for data. I want to run the program as a windows service.
My questions are:
Should both of them run as threads and then just have an infinite loop with
a sleep in the main thread in order to stop the main program from just
terminating?
Or should I choose one of the threads to run as the main program and spawn
the other off? That was my original intention, but I am concerned that if I
use SimpleHTTPRequestHandler in the main thread, will it block any attempt
to terminate the service.
Just looking for pointers to the best practice approach. This is where I am
at:
if __name__==__main__:
import SocketServer
import threading
import monitor
## Monitor changes on the server (separate thread)
monitor = monitor.monitor(fnLog=self.logStatus)
monitor.start()
## Service interface
port = 8081
server=SocketServer.TCPServer(('',port),ScriptRequestHandler)
server.serve_forever()
## To run the web server on a different thread...
##t = threading.Thread(target=server.serve_forever)
##t.setDaemon(True) # don't hang on exit
##t.start()
server.socket.close()
--
http://mail.python.org/mailman/listinfo/python-list
Re: simple GUI for my application?
Tim Harig user...@ilthio.net wrote: IronPython is not a GUI toolkit per se. It is a python implementation build on top of .Net like Jython is built on top of Java. I therefore has access to the MFCs which can be used to create native Windows GUIs. That's not correct. MFC is strictly a native C++ concept. IronPython, being a .NET language, has access to the .NET GUIs, which means either Windows Forms or the incredibly powerful Windows Presentation Framework. However, if I may be allowed to express an opinion, if you're going to play in that world, you are swimming upstream unless you write in C#. Otherwise, you end up spending most of your time translating C# concepts into Python. This can also be done from Cpython using the pywin extensions. Here, you are correct. Pywin32 does include a Python implementation of MFC. -- Tim Roberts, t...@probo.com Providenza Boekelheide, Inc. -- http://mail.python.org/mailman/listinfo/python-list
Re: first full alpha release of PyLab_Works v0.3
edexter wrote: On Jun 16, 12:27 pm, Stef Mientki stef.mien...@gmail.com wrote: hello, I am pleased to announce the first full alpha release of PyLab_Works, v0.3. PyLab_Works is a modular Visual Development Environment, based on data-flow programming technics. PyLab_Works is specially aimed at Education, Engineering and Science. The ideas behind PyLab_Works are, that the final user should not be burdened with programming details and domain details, whereas the domain expert should be able to implement the specific domain knowledge without being a full educated programmer. You can always find my notes on PyLab_Works on http://pic.flappie.nl Most of these pages are also collected in a single pdf document, which can be found here: http://pylab-works.googlecode.com/files/pw_manual.pdf The source code and a one-button-Windows-Installer can be found on codegoogle: http://code.google.com/p/pylab-works/ The files are rather large, because they contain some data samples. The Windows-Installer contains everything you need to get started with PyLab_Works: ConfigObj, gprof2dot, HTTPlib, MatPlotLib, Numpy, Pickle, Psyco, pyclbr, PyGame, PyLab_Works, PyODBC, Python, RLCompleter, Scipy, Sendkeys, SQLite3, SQLObject, URLparse, wave, Visual, win32*, wxPython. Although the PyLab_Works programs are compiled with Py2Exe, all the source files are explicitly included. have fun, Stef Mientki program didn't start because .dll is missing (sorry I don't have the name)... I don't know if that is just an issue with the installer with vista or not (missing msv something 71. dll) You probably mean the microsoft visual C++ runtime (msvcr71.dll), windows vista has a brand new way (via manifest files) to make it more difficult to install compiled binaries. Search for 'Microsoft Visual C++ 2005 Redistributable Package' and install it. -- MPH http://blog.dcuktec.com 'If consumed, best digested with added seasoning to own preference.' -- http://mail.python.org/mailman/listinfo/python-list
Re: question about a command like 'goto ' in Python's bytecode or it's just a compiler optimization?
higer higerinbeij...@gmail.com wrote: My Python version is 2.5.2; When I reading the bytecode of some pyc file, I always found that there are many jump command from different position,but to the same position. You can see this situation in following code(this bytecode is just from one .pyc file and I don't have its source .py file): ... From the above bytecode,we know that line 574 is the point that many position jumps to.So,it just looks like the 'goto' function in C, but we know that there is none such function in Python. ... But ,the question is, I have tried a lot of ways(e.g.for loop,while loop and mixed) to re-present 'goto' style bytecodes like this, but the result depressed me. So,I think maybe it is just a compiler optimization in Python2.5? I'm not sure,so I'm appreciated that if anyone can help me. I can't figure out what you're asking here. Are you annoyed that the byte code contains GOTOs? This is a silly thing to worry about. The whole purpose of a compiler is to translate a program express in high-level constructs into a lower-level and more primitive format. The simplest form of an if statement or a while statement always includes unconditional branches. This exact same thing happens with every compiler. Assembly languages, for example, do not have if/then/else instructions, nor while instructions, nor switch instructions. If you write a C program with an if statement, the resulting assembly program will contain a goto (usually called jump or branch). Don't worry about it. -- Tim Roberts, t...@probo.com Providenza Boekelheide, Inc. -- http://mail.python.org/mailman/listinfo/python-list
Re: Managing a multiple threaded service
On 17/06/2009 4:23 PM, Paul Hemans wrote: Hi, New to Python I've got 2 threads 1 is the SimpleHTTPRequestHandler, the other polls a site for data. I want to run the program as a windows service. My questions are: Should both of them run as threads and then just have an infinite loop with a sleep in the main thread in order to stop the main program from just terminating? No need for a loop - just have the main thread wait forever for the stop request. The main problem I forsee is asking the socketserver thread to terminate as it is likely to be inside 'accept' or some other blocking function. HTH, Mark -- http://mail.python.org/mailman/listinfo/python-list
Re: sqlite3, OperationalError: no such column, shouldn't that ne a ProgrammingError?
John Machin wrote: On Jun 17, 1:41 am, Gabriel Rossetti gabriel.rosse...@arimaz.com wrote: Hello everyone, I get an OperationalError with sqlite3 if I put the wrong column name, but shouldn't that be a ProgrammingError instead? I read PEP 249 and it says : [snip] and to me it sounds more like a programming error than an operational error. How about showing us the code you used and the exact error message and traceback? Well, the code isn't really relevant to the problem, but here is is : import sqlite3 conn = sqlite3.connect(/tmp/test.db) conn.execute(SELECT name, value FROM local_param) for row in conn: print row And I get : Traceback (most recent call last): File stdin, line 1, in module sqlite3.OperationalError: no such table: local_param Which I think should be a ProgrammingError If I fix the table name I but use a wrong column name I also get an OperationalError import sqlite3 conn = sqlite3.connect(/tmp/test.db) conn.execute(SELECT name, valu FROM local_parameters) for row in conn: print row Traceback (most recent call last): File stdin, line 1, in module sqlite3.OperationalError: no such column: valu Which should also be a ProgrammingError as I see it and as my interpretation of the documention. Gabriel -- http://mail.python.org/mailman/listinfo/python-list
Re: strange behavior with os.system
That's it. I am calling my own program and not coreutils' sort, what explains the unrequested output. Many thanks. Cheers, Kay On 16 Jun., 22:16, Piet van Oostrum p...@cs.uu.nl wrote: kmw wuerz...@gmail.com (k) wrote: k Hi, k I wanted to write a simple script (in 5 minutes or so) which replaces k the option '+1' given to the command 'sort' by '-k 2' and than runs k 'sort' with the modified argument list. After two hours I am giving up k and ask you for help. This is what I tried (please excuse the verbose k code, it is due to my various efforts to understand the error): [snip] k Please note the unrequested output of 'type 'NoneType''. The strange k thing about this all is the fact that the whole thing works as k expected when typed into the interpreter. I would be glad if anyone k could help. MRAB has already given you some insight, I hope. But are you aware that you are calling your own program again? Or did you want to call the standard sort program? In that case you shouldn't call ./sort as it is in argv[0], but just sort (assuming '.' is not in your PATH) or the full path, like /usr/bin/sort. -- Piet van Oostrum p...@cs.uu.nl URL:http://pietvanoostrum.com[PGP 8DAE142BE17999C4] Private email: p...@vanoostrum.org -- http://mail.python.org/mailman/listinfo/python-list
Re: Newbie question about method options
python-newbie113 wrote: I am new to python and have a question about using methods. Here is the link i am looking at: http://www.pythonware.com/library/tkinter/introduction/x2102-methods.htm If i use, create_arc(bbox, options) = id what is id? and how do i find the parameter list representing options? Thanks for help in advance Andrew This is a tkinter question, not a python one, and it's really all about how the docs for tkinter are organized. I don't use tkinter, so I had to spelunk a little bit (try search). You're looking at a summary page. You want to see the details for a given one of those methods. Search for create_arc, and you'll find http://www.pythonware.com/library/tkinter/introduction/x2861-options.htm as one of the links. The link Back will get you to: http://www.pythonware.com/library/tkinter/introduction/canvas-arc.htm which is the beginning of Chapter 14, The Canvas Arc Item As for 'id' I have no idea, but if you read further, you'll probably find out. The fact that all of these methods return one indicates it's some sort of object reference for those widgets. -- http://mail.python.org/mailman/listinfo/python-list
Re: question about a command like 'goto ' in Python's bytecode orit's just a compiler optimization?
Diez B. Roggisch d...@n...m.web.de wrote: Getting a depression because of a compiler is a bit strong... However, yes, bytecode is similar to assembler, and in that respect higher-level control-structures are created using (conditional) jumps. The same is true for other bytecode-languages, see here for the JVM: http://java.sun.com/docs/books/jvms/second_edition/html/Overview.doc.html#6493 This is right. It is my opinion that it is not possible to make a useful machine, virtual or real, which executes instructions sequentially, if the instruction set does not contain a conditional jump of some sort. I have tried doing it using conditional calls, and it fails on the equivalent of the first if ..., elif ... you try to write. - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: Tool for browsing python code
Horace Blegg wrote: I've heard from my cousin that his former high school classmate's uncle did a research on a large statistical sample of programmers and found that emacs users' brains are about 12% smaller than vi users' :) I'm afraid it's the other way around, really. You see, emacs contains 5 characters, thus requiring MORE brainpower to understand, where as vi is only 2 characters, requiring LESS brainpower. It's like that old joke. Why do blondes move to L.A? Because it's easy to spell. I guess what I'm saying is vi users are blondes. :) All this stuff is nonsense. It is a well known fact that the size of your brain is not governed by what editor you use, but by what you drink. The conjecture that some editors might drive you to drink is at the moment only a theory. I am not aware of any hard evidence that correlates hard tack drinking patterns with editor usage. So any research on brain size vs editor usage that does not also include drinking pattern data is essentially invalid. - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: walking a directory with very many files
On Wed, 17 Jun 2009 17:53:33 +1200 Lawrence D'Oliveiro l...@geek-central.gen.new_zealand wrote: Why not use hex representation of md5/sha1-hashed id as a path, arranging them like /path/f/9/e/95ea4926a4 ? That way, you won't have to deal with many-files-in-path problem ... Why is that a problem? So you can os.listdir them? Don't ask me what for, however, since that's the original question. Also not every fs still in use handles this situation effectively, see my original post. -- Mike Kazantsev // fraggod.net signature.asc Description: PGP signature -- http://mail.python.org/mailman/listinfo/python-list
Re: Exotic Logics
On Tue, 16 Jun 2009 22:46:14 -0700, William Clifford wrote: I was staring at a logic table the other day, and I asked myself, what if one wanted to play with exotic logics; how might one do it? First question: what's an exotic logics? Do you mean things like three-value logic, fuzzy logic, probabilistic reasoning, etc? Or do you mean logical operators others than and, or, xor, nand, nor, etc? Or both? Something else? I did some searching but not being too sure of what to look for and carried away with my own enthusiasm for the idea, I didn't find much. What I've come up with is, no doubt, inefficient, naive, poor python style, and probably wrong in fundamental ways too subtle for me, but here it is: import itertools import operator class Logic(): class of generic logic operators [...] If (nearly) all your methods are static methods, chances are a class is the wrong solution. Why not just define the static methods as top-level functions? This seemed to be working for the limited tests I did on it, while I was doing them. The following checked out last time I tried: and_ = Logic(2, 8) or_ = Logic(2, 14) xor = Logic(2, 6) I have no idea how to validate the results of the trinary and beyond logics. The same way you would validate and_, or_ and xor: to validate something, you need to know what the correct answer is, then compare the answer you get with the answer you should get. For a binary operator and binary operands, you can exhaustively check every valid input: flag1 op flag2 there are four combinations of input flags: 0 op 0 0 op 1 1 op 0 1 op 1 For three-valued logic, there are 9 combinations. For four-valued, 16. So exhaustively testing all the possible inputs is quite simple. As far as getting the correct answers, you have to decide which three- valued logic(s) you want to use, then go look them up. Or just make them up yourself! E.g. given trinary flags 0, 1, 2, (say), you might want the operators to give the same results with 0, 1 as they would if you were applying it to binary flags 0, 1. E.g.: # binary operands 0 and 0 = 0 0 and 1 = 0 1 and 0 = 0 1 and 1 = 1 # trinary operands 0 and 0 = 0 0 and 1 = 0 0 and 2 = ? # probably 0 1 and 0 = 0 1 and 1 = 1 1 and 2 = ? # could be 0, or maybe 1 2 and 0 = ? # probably 0 2 and 1 = ? # 0 or 1 2 and 2 = ? # probably 2 Different choices lead to different versions of ternary logic. Thanks for reading and trying this out. Corrections? Criticism? Comments? You're implementation seems rather confusing. I think that's partly because you use lots of abbreviated jargon terms that mean little or nothing to me: rdx, opr (operator?), lsd, pute. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Exotic Logics
On Tue, 16 Jun 2009 22:46:14 -0700, William Clifford wrote: I was staring at a logic table the other day, and I asked myself, what if one wanted to play with exotic logics; how might one do it? This might be useful for you, and if not useful, at least it might blow your mind like it did mine. (This is not original to me -- I didn't create it. However, I can't find the original source.) Imagine for a moment that there are no boolean values. There are no numbers. They were never invented. There are no classes. There are no objects. There are only functions. Could you define functions that act like boolean values? And could you define other functions to operate on them? def true(x, y): return x def false(x, y): return y def print_bool(b): print b(true, false) print_bool(true) print_bool(false) def Not(b): def not_b(x, y): return b(y, x) return not_b print_bool(Not(true)) print_bool(Not(false)) print_bool(Not(Not(true))) def And(a, b): return a(b, a) def Or(a, b): return a(a, b) print_bool(And(true, true)) print_bool(And(true, false)) print_bool(Or(false, true)) print_bool(Or(false, false)) -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: question about a command like 'goto ' in Python's bytecode orit's just a compiler optimization?
Hi,all: I'm sorry that I did not make my question clear. What I mean is that what the souce code would look like that will be compiled to such bytecodes. Regards, higer -- http://mail.python.org/mailman/listinfo/python-list
Re: Need to know if a file as only ASCII charaters
On Wednesday 17 June 2009, Lie Ryan wrote:
Wolfgang Rohdewald wrote:
On Wednesday, 17. June 2009, Steven D'Aprano wrote:
while text:
for c in text:
if c not in printable: return False
that is one loop per character.
unless printable is a set
that would still execute the line if c not in...
once for every single character, against just one
regex call. With bigger block sizes, the advantage
of regex should increase.
wouldn't it be faster to apply a regex to text?
something like
while text:
if re.search(r'\W',text): return False
regex? Don't even start...
Here comes a cProfile test. Note that the first variant of Steven
would always have stopped after the first char. After fixing that
making it look like variant 2 with block size=1, I now have
3 variants:
Variant 1 Blocksize 1
Variant 2 Blocksize 65536
Variant 3 Regex on Blocksize 65536
testing for a file with 400k bytes shows regex as a clear winner.
Doing the same for an 8k file: variant 2 takes 3ms, Regex takes 5ms.
Variants 2 and 3 take about the same time for a file with 20k.
python ascii.py | grep CPU
398202 function calls in 1.597 CPU seconds
13 function calls in 0.104 CPU seconds
1181 function calls in 0.012 CPU seconds
import re
import cProfile
from string import printable
def ascii_file1(name):
with open(name, 'rb') as f:
c = f.read(1)
while c:
if c not in printable: return False
c = f.read(1)
return True
def ascii_file2(name):
bs = 65536
with open(name, 'rb') as f:
text = f.read(bs)
while text:
for c in text:
if c not in printable: return False
text = f.read(bs)
return True
def ascii_file3(name):
bs = 65536
search = r'[^%s]' % re.escape(printable)
reco = re.compile(search)
with open(name, 'rb') as f:
text = f.read(bs)
while text:
if reco.search(text): return False
text = f.read(bs)
return True
def test(fun):
if fun('/tmp/x'):
print 'is ascii'
else:
print 'is not ascii'
cProfile.run(test(ascii_file1))
cProfile.run(test(ascii_file2))
cProfile.run(test(ascii_file3))
--
Wolfgang
--
http://mail.python.org/mailman/listinfo/python-list
Re: question about a command like 'goto ' in Python's bytecode orit's just a compiler optimization?
higer wrote: Hi,all: I'm sorry that I did not make my question clear. What I mean is that what the souce code would look like that will be compiled to such bytecodes. import dis def foo(): ... for i in xrange(10): ... if i == 5: ...break ... if i == 4: ...continue ... i *= 100 ... dis.disassemble(foo.func_code) 2 0 SETUP_LOOP 68 (to 71) 3 LOAD_GLOBAL 0 (xrange) 6 LOAD_CONST 1 (10) 9 CALL_FUNCTION1 12 GET_ITER 13 FOR_ITER54 (to 70) 16 STORE_FAST 0 (i) 3 19 LOAD_FAST0 (i) 22 LOAD_CONST 2 (5) 25 COMPARE_OP 2 (==) 28 JUMP_IF_FALSE5 (to 36) 31 POP_TOP 4 32 BREAK_LOOP 33 JUMP_FORWARD 1 (to 37) 36 POP_TOP 537 LOAD_FAST0 (i) 40 LOAD_CONST 3 (4) 43 COMPARE_OP 2 (==) 46 JUMP_IF_FALSE7 (to 56) 49 POP_TOP 6 50 JUMP_ABSOLUTE 13 53 JUMP_FORWARD 1 (to 57) 56 POP_TOP 757 LOAD_FAST0 (i) 60 LOAD_CONST 4 (100) 63 INPLACE_MULTIPLY 64 STORE_FAST 0 (i) 67 JUMP_ABSOLUTE 13 70 POP_BLOCK 71 LOAD_CONST 0 (None) 74 RETURN_VALUE Pretty much everything with control-structures. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: sqlite3, OperationalError: no such column, shouldn't that ne a ProgrammingError?
On 17/06/2009 5:15 PM, Gabriel Rossetti wrote: John Machin wrote: On Jun 17, 1:41 am, Gabriel Rossetti gabriel.rosse...@arimaz.com wrote: Hello everyone, I get an OperationalError with sqlite3 if I put the wrong column name, but shouldn't that be a ProgrammingError instead? I read PEP 249 and it says : [snip] and to me it sounds more like a programming error than an operational error. How about showing us the code you used and the exact error message and traceback? Well, the code isn't really relevant to the problem, but here is is : import sqlite3 conn = sqlite3.connect(/tmp/test.db) conn.execute(SELECT name, value FROM local_param) for row in conn: print row And I get : Traceback (most recent call last): File stdin, line 1, in module sqlite3.OperationalError: no such table: local_param Which I think should be a ProgrammingError If I fix the table name I but use a wrong column name I also get an OperationalError OK OK alright already ... I agree with you ... report a bug. Cheers, John -- http://mail.python.org/mailman/listinfo/python-list
class or instance method
Hi, I would like to have a method that is both a classmethod and an instancemethod. So: class MyClass(object): @class_or_instance def myfunc(cls_or_self): pass The semantics I'd like are: When you call MyClass.myfunc, it gets passed a class When you call MyClass().myfunc, it gets passed an instance I'm sure I've seen some code to do this somewhere, but I can't find it now. Any help appreciated. Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: question about a command like 'goto ' in Python's bytecode orit's just a compiler optimization?
On Jun 17, 9:01 am, Hendrik van Rooyen m...@microcorp.co.za wrote: Diez B. Roggisch d...@n...m.web.de wrote: Getting a depression because of a compiler is a bit strong... However, yes, bytecode is similar to assembler, and in that respect higher-level control-structures are created using (conditional) jumps. The same is true for other bytecode-languages, see here for the JVM: http://java.sun.com/docs/books/jvms/second_edition/html/Overview.doc This is right. It is my opinion that it is not possible to make a useful machine, virtual or real, which executes instructions sequentially, if the instruction set does not contain a conditional jump of some sort. I have tried doing it using conditional calls, and it fails on the equivalent of the first if ..., elif ... you try to write. - Hendrik Not a matter of opinion. One of the requisite elements of a Turing Machine is conditional jumping. -- http://mail.python.org/mailman/listinfo/python-list
GAEUnit testing
Hello I'm using GAEUnit to develop an app for google appengine and am having a little trouble. I'm trying to make a test as follows: I have a file (say model.py) which contains Model.db model classes and some methods for accessing them. The methods are not part of the class. In my test I can call model.save_person(person) which will call Person(name=person) and Person.put(). I can confirm this is being saved to the db (app engine db stub) by logging the result of Person.all() under the call to put. What I want to do is create a method in model.py called get_people which will return Person.all(). If I do this the second test returns an empty result set. I think this is because the second test is not getting the same reference. In my set up I'd like to set up a Person with details such as address, phone, preferences and have each test get the data for this person and test the result of some transformations. I'd like to do this using the methods in my model.py class, and avoid importing the database to the test unit and using references to self. Am I approaching this correctly? How would I implement this? Thanks for any assistance, I'm new to python and especially unittesting. -- http://mail.python.org/mailman/listinfo/python-list
Re: class or instance method
Paul Johnston a écrit : Hi, I would like to have a method that is both a classmethod and an instancemethod. So: class MyClass(object): @class_or_instance def myfunc(cls_or_self): pass The semantics I'd like are: When you call MyClass.myfunc, it gets passed a class When you call MyClass().myfunc, it gets passed an instance I'm sure I've seen some code to do this somewhere, but I can't find it now. Any help appreciated. IIRC, there's something quite similar in formencode. -- http://mail.python.org/mailman/listinfo/python-list
Re: Question about None
John Yeung a écrit : On Jun 13, 2:29 am, Steven D'Aprano st...@removethis.cybersource.com.au wrote: Paul LaFollette wrote: 3) (this is purely philosophical but I am curious) Would it not be more intuitive if isinstance(None, anything at all) returned true? Good grief no!!! None is an object. It has a type, NoneType. It's *not* a string, or a float, or an int, or a list, so why would you want isinstance() to *lie* and say that it is? Because you might want None to behave as though it were nothing at all. Paul LaFollette is probably thinking along the lines of formal logic or set theory. It's a little bit confused because programming isn't quite the same as math, and so it's a common question when designing and implementing programming languages how far to take certain abstractions. In some languages, nil, null, or none will try to behave as mathematically close to nothing (complete absence of anything) as possible, even though in reality they have to have some concrete implementation, such as perhaps being a singleton object. But mathematically speaking, it's intuitive that nothing would match any type. IOW, what's the OP is after is not the None type, but some yet unexisting Anything type !-) -- http://mail.python.org/mailman/listinfo/python-list
Re: walking a directory with very many files
In message 20090617142431.2b25f...@malediction, Mike Kazantsev wrote: On Wed, 17 Jun 2009 17:53:33 +1200 Lawrence D'Oliveiro l...@geek-central.gen.new_zealand wrote: Why not use hex representation of md5/sha1-hashed id as a path, arranging them like /path/f/9/e/95ea4926a4 ? That way, you won't have to deal with many-files-in-path problem ... Why is that a problem? So you can os.listdir them? Why should you have a problem os.listdir'ing lots of files? -- http://mail.python.org/mailman/listinfo/python-list
Re: TypeError: int argument required
In message n4qzl.19093$y61.17...@news-server.bigpond.net.au, Lie Ryan
wrote:
out.write (
'''
function JSString(Str)
{
var Result = '\'
for (var i = 0; i Str.length; ++i)
{
var ThisCh = Str.charAt(i)
if (ThisCh == '\\')
{
ThisCh = ''
}
else if (ThisCh == '\')
{
ThisCh = '\\\'
}
else if (ThisCh == '\t')
{
ThisCh = '\\t'
}
else if (ThisCh == '\n')
{
ThisCh = '\\n'
} /*if*/
Result += ThisCh
} /*for*/
return Result + '\'
} /*JSString*/
'''
)
You haven't managed to get rid of the backslashes.
I might go even further:
out.write (
'''
function JSString(Str)
{
const dq = '\'
const slash = '\\'
var Result = dq
for (var i = 0; i Str.length; ++i)
{
var ThisCh = Str.charAt(i)
if (ThisCh == slash)
{
ThisCh = slash + slash
}
else if (ThisCh == dq)
{
ThisCh = slash + dq
}
else if (ThisCh == '\t')
{
ThisCh = slash + 't'
}
else if (ThisCh == '\n')
{
ThisCh = slash + 'n'
} /*if*/
Result += ThisCh
} /*for*/
return Result + dq
} /*JSString*/
'''
)
Now you've lost track of the original point of the discussion, which is
about using alternate quotes to avoid backslashes.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Exceptions and Object Destruction (was: Problem with apsw and garbage collection)
In message 7x7hzbv14a@ruckus.brouhaha.com, wrote: Lawrence D'Oliveiro l...@geek-central.gen.new_zealand writes: Reference counting is an implementation detail used by CPython but not [implementations built on runtimes designed for corporate-herd-oriented languages, like] IronPython or Jython. I rest my case. You're really being pretty ignorant. I don't know of any serious Lisp system that uses reference counting, both for performance reasons and to make sure cyclic structures are reclaimed properly. Both of which, oddly enough, more modern dynamic languages like Python manage perfectly well. -- http://mail.python.org/mailman/listinfo/python-list
Re: Measuring Fractal Dimension ?
On Jun 17, 2009, at 2:04 AM, Paul Rubin wrote: Jaime Fernandez del Rio jaime.f...@gmail.com writes: I am pretty sure that a continuous sequence of curves that converges to a continuous curve, will do so uniformly. I think a typical example of a curve that's continuous but not uniformly continuous is f(t) = sin(1/t), defined when t 0 It is continuous at every t0 but wiggles violently as you get closer to t=0. You wouldn't be able to approximate it by sampling a finite number of points. A sequence like g_n(t) = sin((1+1/n)/ t)for n=1,2,... obviously converges to f, but not uniformly. On a closed interval, any continuous function is uniformly continuous. Isn't (-∞, ∞) closed? Charles Yeomans -- http://mail.python.org/mailman/listinfo/python-list
Regarding Python is scripting language or not
Hi, I have very basic question about Python that do we consider pyhton as script language. I searched in google but it becomes more confusion for me. After some analysis I came to know that Python support oops . Can anyone Guide me that Python is Oject oriented programming language or Script language Abhishek Goswami Chennai Phone No -0996227099 ICC World Twenty20 England #39;09 exclusively on YAHOO! CRICKET http://cricket.yahoo.com-- http://mail.python.org/mailman/listinfo/python-list
Re: Exceptions and Object Destruction (was: Problem with apsw and garbage collection)
On Jun 17, 2009, at 2:13 AM, Paul Rubin wrote: Lawrence D'Oliveiro l...@geek-central.gen.new_zealand writes: Reference counting is an implementation detail used by CPython but not [implementations built on runtimes designed for corporate-herd- oriented languages, like] IronPython or Jython. I rest my case. You're really being pretty ignorant. I don't know of any serious Lisp system that uses reference counting, both for performance reasons and to make sure cyclic structures are reclaimed properly. Lisp is certainly not a corporate herd language. Even CPython doesn't rely completely on reference counting (it has a fallback gc for cyclic garbage). Python introduced the with statement to get away from the kludgy CPython programmer practice of opening files and relying on the file being closed when the last reference went out of scope. I'm curious as you why you consider this practice to be kludgy; my experience with RAII is pretty good. Charles Yeomans -- http://mail.python.org/mailman/listinfo/python-list
Re: Measuring Fractal Dimension ?
On Jun 17, 7:04 am, Paul Rubin http://phr...@nospam.invalid wrote: I think a typical example of a curve that's continuous but not uniformly continuous is f(t) = sin(1/t), defined when t 0 It is continuous at every t0 but wiggles violently as you get closer to t=0. You wouldn't be able to approximate it by sampling a finite number of points. A sequence like g_n(t) = sin((1+1/n)/ t) for n=1,2,... obviously converges to f, but not uniformly. On a closed interval, any continuous function is uniformly continuous. Right, but pointwise convergence doesn't imply uniform convergence even with continuous functions on a closed bounded interval. For an example, take the sequence g_n (n = 0), of continuous real-valued functions on [0, 1] defined by: g_n(t) = nt if 0 = t = 1/n else 1 Then for any 0 = t = 1, g_n(t) - 0 as n - infinity. But the convergence isn't uniform: max_t(g_n(t)-0) = 1 for all n. Maybe James is thinking of the standard theorem that says that if a sequence of continuous functions on an interval converges uniformly then its limit is continuous? Mark -- http://mail.python.org/mailman/listinfo/python-list
Re: Perl's @foo[3,7,1,-1] ?
On Wed, Jun 17, 2009 at 04:14, Steven D'Aprano wrote: What's np.arange? import numpy as np -- Pierre delroth Bourdon delr...@gmail.com Étudiant à l'EPITA / Student at EPITA Perfect example of why renaming namespaces should be done only when absolutely required, that is, almost never. Jean-Michel -- http://mail.python.org/mailman/listinfo/python-list
Re: class or instance method
I'm quite curious as to why you would like it, because: MyClass (returns the MyClass class representation) MyClass() (returns a instance of the MyClass class) So, are you just looking for a method that does exactly the above? Best regards, Ching-Yun Xavier Ho, Technical Artist Contact Information Mobile: (+61) 04 3335 4748 Skype ID: SpaXe85 Email: cont...@xavierho.com Website: http://xavierho.com/ On Wed, Jun 17, 2009 at 8:39 PM, Bruno Desthuilliers bruno.42.desthuilli...@websiteburo.invalid wrote: Paul Johnston a écrit : Hi, I would like to have a method that is both a classmethod and an instancemethod. So: class MyClass(object): @class_or_instance def myfunc(cls_or_self): pass The semantics I'd like are: When you call MyClass.myfunc, it gets passed a class When you call MyClass().myfunc, it gets passed an instance I'm sure I've seen some code to do this somewhere, but I can't find it now. Any help appreciated. IIRC, there's something quite similar in formencode. -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Measuring Fractal Dimension ?
On Wed, Jun 17, 2009 at 1:52 PM, Mark Dickinsondicki...@gmail.com wrote: Maybe James is thinking of the standard theorem that says that if a sequence of continuous functions on an interval converges uniformly then its limit is continuous? Jaime was simply plain wrong... The example that always comes to mind when figuring out uniform convergence (or lack of it), is the step function , i.e. f(x)= 0 if x in [0,1), x(x)=1 if x = 1, being approximated by the sequence f_n(x) = x**n if x in [0,1), f_n(x) = 1 if x=1, where uniform convergence is broken mostly due to the limiting function not being continuous. I simply was too quick with my extrapolations, and have realized I have a lot of work to do for my real and functional analysis exam coming in three weeks... Jaime P.S. The snowflake curve, on the other hand, is uniformly continuous, right? -- (\__/) ( O.o) ( ) Este es Conejo. Copia a Conejo en tu firma y ayúdale en sus planes de dominación mundial. -- http://mail.python.org/mailman/listinfo/python-list
Re: question about a command like 'goto ' in Python's bytecode or it's just a compiler optimization?
On Jun 17, 1:40 pm, higer higerinbeij...@gmail.com wrote: My Python version is 2.5.2; When I reading the bytecode of some pyc file, I always found that there are many jump command from different position,but to the same position. You can see this situation in following code(this bytecode is just from one .pyc file and I don't have its source .py file): Why don't you (a) read the answers you got on stackoverflow to the identical question (b) WRITE some code instead of inspecting the entrails of the code of others? -- http://mail.python.org/mailman/listinfo/python-list
Re: Regarding Python is scripting language or not
abhishek goswami wrote: Hi, I have very basic question about Python that do we consider pyhton as script language. I searched in google but it becomes more confusion for me. After some analysis I came to know that Python support oops . Can anyone Guide me that Python is Oject oriented programming language or Script language Abhishek Goswami Chennai Phone No -0996227099 ICC World Twenty20 England '09 exclusively on YAHOO! CRICKET http://in.rd.yahoo.com/tagline_cricket_3/*http://cricket.yahoo.com Depends on what you are calling a scripting language. Refering to wikipedia, A *scripting language*, *script language* or *extension language* is a programming language http://en.wikipedia.org/wiki/Programming_language that allows some control of a single or many software application(s) http://en.wikipedia.org/wiki/Application_software. Python is definitely OOP oriented and I don't think it fits in the script definition above. Python is interpreted and platform independent, but you can still build standalone platform dependent binaries if required. Regarding your last question, I'm not sure scripting and OOP language are not compatible, I'm pretty sure you'll be able to find OOP scripting language. Jean-Michel -- http://mail.python.org/mailman/listinfo/python-list
Re: Regarding Python is scripting language or not
abhishek goswami: Can anyone Guide me that Python is Oject oriented programming language or Script language In my opinion, Python is both. But an objective answer would require you to define what you means by these terms. If, by object-oriented you mean everything has to be put into classes, then Python is not object-oriented. If, by scripting language you mean Python is an error-prone toy language, unsuitable for large, serious projects, then Python is not a scripting language either. J. -- My clothes aren't just fashion. They're a lifestyle. [Agree] [Disagree] http://www.slowlydownward.com/NODATA/data_enter2.html signature.asc Description: Digital signature -- http://mail.python.org/mailman/listinfo/python-list
Re: Measuring Fractal Dimension ?
On Jun 17, 1:26 pm, Jaime Fernandez del Rio jaime.f...@gmail.com wrote: On Wed, Jun 17, 2009 at 1:52 PM, Mark Dickinsondicki...@gmail.com wrote: Maybe James is thinking of the standard theorem that says that if a sequence of continuous functions on an interval converges uniformly then its limit is continuous? s/James/Jaime. Apologies. P.S. The snowflake curve, on the other hand, is uniformly continuous, right? Yes, at least in the sense that it can be parametrized by a uniformly continuous function from [0, 1] to the Euclidean plane. I'm not sure that it makes a priori sense to describe the curve itself (thought of simply as a subset of the plane) as uniformly continuous. Mark -- http://mail.python.org/mailman/listinfo/python-list
Re: question about a command like 'goto ' in Python's bytecode or it's just a compiler optimization?
On Jun 17, 8:29 pm, John Machin sjmac...@lexicon.net wrote: On Jun 17, 1:40 pm, higer higerinbeij...@gmail.com wrote: My Python version is 2.5.2; When I reading the bytecode of some pyc file, I always found that there are many jump command from different position,but to the same position. You can see this situation in following code(this bytecode is just from one .pyc file and I don't have its source .py file): Why don't you (a) read the answers you got on stackoverflow to the identical question (b) WRITE some code instead of inspecting the entrails of the code of others? Thanks, I read the answer just now. And thank everbody for your suggestion! -- http://mail.python.org/mailman/listinfo/python-list
Re: Perl's @foo[3,7,1,-1] ?
Jean-Michel Pichavant wrote: On Wed, Jun 17, 2009 at 04:14, Steven D'Aprano wrote: What's np.arange? import numpy as np Perfect example of why renaming namespaces should be done only when absolutely required, that is, almost never. Jean-Michel Actually, np. is quite commonly used in the numpy community, so it is a bit of a term of art. Since you can often use several numpy elements in an expression, brevity is appreciated, and at least they've stopped assuming from numpy import * in their documents. Unfortunately, if you work in a numpy world long enough, you'll forget that not everyone uses numpy. --Scott David Daniels scott.dani...@acm.org -- http://mail.python.org/mailman/listinfo/python-list
Re: Regarding Python is scripting language or not
Jochen Schulz wrote: abhishek goswami: Can anyone Guide me that Python is Oject oriented programming language or Script language In my opinion, Python is both. But an objective answer would require you to define what you means by these terms. If, by object-oriented you mean everything has to be put into classes, then Python is not object-oriented. If, by scripting language you mean Python is an error-prone toy language, unsuitable for large, serious projects, then Python is not a scripting language either. J. IMHO Python is an programming environment where you can chose the right approach for your particular problem. Because it seems to favour clarity over classification purity, it can not be so easily defined. This approach should be fine for everybody unless you are the type that insist on using one approach because in theory it should be suitable for everything. -- MPH http://blog.dcuktec.com 'If consumed, best digested with added seasoning to own preference.' -- http://mail.python.org/mailman/listinfo/python-list
Re: Newbie question about method options
Dave Angel wrote: python-newbie113 wrote: I am new to python and have a question about using methods. Here is the link i am looking at: http://www.pythonware.com/library/tkinter/introduction/x2102-methods.htm If i use, create_arc(bbox, options) = id what is id? and how do i find the parameter list representing options? Search for create_arc, and you'll find http://www.pythonware.com/library/tkinter/introduction/x2861-options.htm as one of the links. The link Back will get you to: http://www.pythonware.com/library/tkinter/introduction/canvas-arc.htm which is the beginning of Chapter 14, The Canvas Arc Item As for 'id' I have no idea, but if you read further, you'll probably find out. The fact that all of these methods return one indicates it's some sort of object reference for those widgets. Everything drawn on a canvas has an 'id' which just happens to be an integer (treat it as a magic cookie). You specify that id to the canvas to talk about that particular element, but you often group canvas elements together via tags, and use the same canvas operations on a tag so that you can do your operation to everything with that tag. operations include such things as color manipulation, delete, clone, and move. --Scott David Daniels scott.dani...@acm.org -- http://mail.python.org/mailman/listinfo/python-list
Re: UDP queue size
找尋自己的一片天 wrote: I got a problem about UDP. How do I get the UDP buffer size? When the server had some delay in handling incoming UDP, it will lost some package. I wonder it's because the system buffer size, is there any ways to find the exactly size of the buffer? UDP is defined as best effort then give up, so _everything_ that handles a UDP packet is allowed to drop it; that means switchers, routers, ..., anything along the path to the target application. So, you cannot expect to do any better than a conservative guess, perhaps augmented by dynamic scaling. --Scott David Daniels scott.dani...@acm.org -- http://mail.python.org/mailman/listinfo/python-list
Newbie queue question
Hi,
I'm pretty new to Python (2.6) and I've run into a problem I just
can't seem to solve.
I'm using dbfpy to access DBF tables as part of a little test project.
I've programmed two separate functions, one that reads the DBF in main
thread and the other which reads the DBF asynchronously in a separate
thread.
Here's the code:
def demo_01():
'''DBF read speed only'''
dbf1 = Dbf('D:\\python\\testdbf\\promet.dbf', readOnly=1)
for i1 in xrange(len(dbf1)):
rec = dbf1[i1]
dbf1.close()
def demo_03():
'''DBF read speed into a FIFO queue'''
class mt(threading.Thread):
q = Queue.Queue(64)
def run(self):
dbf1 = Dbf('D:\\python\\testdbf\\promet.dbf', readOnly=1)
for i1 in xrange(len(dbf1)):
self.q.put(dbf1[i1])
dbf1.close()
del dbf1
self.q.join()
t = mt()
t.start()
while t.isAlive():
try:
rec = t.q.get(False, 0.2)
t.q.task_done();
except:
pass
del t
However I'm having serious issues with the second method. It seems
that as soon as I start accessing the queue from both threads, the
reading speed effectively halves.
I have tried the following:
1. using deque instead of queue (same speed)
2. reading 10 records at a time and inserting them in a separate loop
(hoped the congestion would help)
3. Increasing queue size to infinite and waiting 10 seconds in main
thread before I started reading - this one yielded full reading speed,
but the waiting took away all the threading benefits
I'm sure I'm doing something very wrong here, I just can't figure out
what.
Can anyone help me with this?
Thanks,
Jure
--
http://mail.python.org/mailman/listinfo/python-list
Re: first full alpha release of PyLab_Works v0.3
On Jun 17, 12:29 am, Martin P. Hellwig martin.hell...@dcuktec.org wrote: edexter wrote: On Jun 16, 12:27 pm, Stef Mientki stef.mien...@gmail.com wrote: hello, I am pleased to announce the first full alpha release of PyLab_Works, v0.3. PyLab_Works is a modular Visual Development Environment, based on data-flow programming technics. PyLab_Works is specially aimed at Education, Engineering and Science. The ideas behind PyLab_Works are, that the final user should not be burdened with programming details and domain details, whereas the domain expert should be able to implement the specific domain knowledge without being a full educated programmer. You can always find my notes on PyLab_Works on http://pic.flappie.nl Most of these pages are also collected in a single pdf document, which can be found here: http://pylab-works.googlecode.com/files/pw_manual.pdf The source code and a one-button-Windows-Installer can be found on codegoogle: http://code.google.com/p/pylab-works/ The files are rather large, because they contain some data samples. The Windows-Installer contains everything you need to get started with PyLab_Works: ConfigObj, gprof2dot, HTTPlib, MatPlotLib, Numpy, Pickle, Psyco, pyclbr, PyGame, PyLab_Works, PyODBC, Python, RLCompleter, Scipy, Sendkeys, SQLite3, SQLObject, URLparse, wave, Visual, win32*, wxPython. Although the PyLab_Works programs are compiled with Py2Exe, all the source files are explicitly included. have fun, Stef Mientki program didn't start because .dll is missing (sorry I don't have the name)... I don't know if that is just an issue with the installer with vista or not (missing msv something 71. dll) You probably mean the microsoft visual C++ runtime (msvcr71.dll), windows vista has a brand new way (via manifest files) to make it more difficult to install compiled binaries. Search for 'Microsoft Visual C++ 2005 Redistributable Package' and install it. -- MPHhttp://blog.dcuktec.comm 'If consumed, best digested with added seasoning to own preference.' it says I am missing msvcp71.dll installing Microsoft Visual C++ 2005 Redistributable Package did not help.. I had simular problems with alot of installers I had saved (from installing on xp) but when I grabbed newer installers they all worked, could be the manifast I was looking forward to trying it out.. -- http://mail.python.org/mailman/listinfo/python-list
Re: Measuring Fractal Dimension ?
On Jun 17, 2:18 pm, pdpi pdpinhe...@gmail.com wrote:
On Jun 17, 1:26 pm, Jaime Fernandez del Rio jaime.f...@gmail.com
wrote:
P.S. The snowflake curve, on the other hand, is uniformly continuous, right?
The definition of uniform continuity is that, for any epsilon 0,
there is a delta 0 such that, for any x and y, if x-y delta, f(x)-f
(y) epsilon. Given that Koch's curve is shaped as recursion over the
transformation from ___ to _/\_, it's immediately obvious that, for a
delta of at most the length of , epsilon will be at most the
height of /. It follows that, inversely, for any arbitrary epsilon,
you find the smallest / that's still taller than epsilon, and delta is
bound by the respective . (hooray for ascii demonstrations)
I think I'm too stupid to follow this. It looks as though
you're treating (a portion of?) the Koch curve as the graph
of a function f from R - R and claiming that f is uniformly
continuous. But the Koch curve isn't such a graph (it fails
the 'vertical line test', in the language of precalculus 101),
so I'm confused.
Here's an alternative proof:
Let K_0, K_1, K_2, ... be the successive generations of the Koch
curve, so that K_0 is the closed line segment from (0, 0) to
(1, 0), K_1 looks like _/\_, etc.
Parameterize each Kn by arc length, scaled so that the domain
of the parametrization is always [0, 1] and oriented so that
the parametrizing function fn has fn(0) = (0,0) and fn(1) = (1, 0).
Let d = ||f1 - f0||, a positive real constant whose exact value
I can't be bothered to calculate[*] (where ||f1 - f0|| means
the maximum over all x in [0, 1] of the distance from
f0(x) to f1(x)).
Then from the self-similarity we get ||f2 - f1|| = d/3,
||f3 - f2|| = d/9, ||f4 - f3|| = d/27, etc.
Hence, since sum_{i = 0} d/(3^i) converges absolutely,
the sequence f0, f1, f2, ... converges *uniformly* to
a limiting function f : [0, 1] - R^2 that parametrizes the
Koch curve. And since a uniform limit of uniformly continuous
function is uniformly continuous, it follows that f is
uniformly continuous.
Mark
[*] I'm guessing 1/sqrt(12).
--
http://mail.python.org/mailman/listinfo/python-list
Re: Tool for browsing python code
On 16 Jun, 14:48, Lucas P Melo lukepada...@gmail.com wrote: Is there any tool for browsing python code? (I'm having a hard time trying to figure this out) Anything like cscope with vim would be great. Are you limiting your inquiry to text editors or IDEs, or are Web- based solutions also interesting? Often, convenient browsing tools index the code and try and provide reasonable links from the place where a particular name or symbol may be used to the definition of that name or symbol elsewhere in a system. Initially, for a Web-based code browser, I looked at LXR [1], but it seemed that OpenGrok [2] was probably a better solution except for the fact that it uses the usual Java parallel universe of Web and application servers. Meanwhile, there are pages on the python.org Wiki about IDEs, editors and documentation tools, all of which might be relevant here: http://wiki.python.org/moin/DevelopmentTools Paul [1] http://lxr.linux.no/ [2] http://opensolaris.org/os/project/opengrok/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Tool for browsing python code
On Tue, Jun 16, 2009 at 7:48 AM, Lucas P Melolukepada...@gmail.com wrote: Is there any tool for browsing python code? (I'm having a hard time trying to figure this out) Anything like cscope with vim would be great. Check out pycscope: http://pypi.python.org/pypi/pycscope/0.3 I use it myself, and it works fine. Better than ctags/etags for python. Kurt -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: pyTenjin 0.8.0 - much faster template engine than Django
kwatch wrote: I have released pyTenjin 0.8.0 Thanks for your project. I have used it a little, and there is a question to you. import tenjin from tenjin.helpers import * shared_cache = tenjin.GaeMemcacheCacheStorage() engine = tenjin.Engine(cache=shared_cache) 1. Why should I import tenjin.helpers if I don't use the helpers in my code? 2. Why does the code not work if I don't import the helpers? I think you should manage this issue inside the library. -- http://mail.python.org/mailman/listinfo/python-list
Re: persistent composites
On Jun 16, 10:09 am, Mike Kazantsev mk.frag...@gmail.com wrote: On Tue, 16 Jun 2009 06:57:13 -0700 (PDT) Aaron Brady castiro...@gmail.com wrote: Making the charitable interpretation that this was the extent of c-l- py's support and enthusiasm for my idea, I will now go into mourning. Death occurred at oh-eight-hundred. Rest in peace, support enthusiasm. I've read this thread from the beginning, being tempted to insert remarks about shelve module or ORMs like SQLAlchemy, but that'd be meaningless without the problem description, which I haven't seen anywhere. Is it some trick idea like let's walk on our heads? More like bronze them, or hang them on a tackboard. You haven't convinced me that it's not a problem, or that it's an easy one. -- http://mail.python.org/mailman/listinfo/python-list
Re: Question about None
On Jun 17, 5:47 am, Bruno Desthuilliers bruno. 42.desthuilli...@websiteburo.invalid wrote: John Yeung a écrit : But mathematically speaking, it's intuitive that nothing would match any type. IOW, what's the OP is after is not the None type, but some yet unexisting Anything type !-) The behaviors of the 'anything' object are a subset of those of any other object. I don't believe that 'subset' is a proper characterization of the relationship between the methods of a subclass and the methods of its superclass. But 'superset' may be. Should 'object' inherit from None? -- http://mail.python.org/mailman/listinfo/python-list
Re: Measuring Fractal Dimension ?
On Jun 17, 3:46 pm, Paul Rubin http://phr...@nospam.invalid wrote: Mark Dickinson dicki...@gmail.com writes: It looks as though you're treating (a portion of?) the Koch curve as the graph of a function f from R - R and claiming that f is uniformly continuous. But the Koch curve isn't such a graph (it fails the 'vertical line test', I think you treat it as a function f: R - R**2 with the usual distance metric on R**2. Right. Or rather, you treat it as the image of such a function, if you're being careful to distinguish the curve (a subset of R^2) from its parametrization (a continuous function R - R**2). It's the parametrization that's uniformly continuous, not the curve, and since any curve can be parametrized in many different ways any proof of uniform continuity should specify exactly which parametrization is in use. Mark -- http://mail.python.org/mailman/listinfo/python-list
Re: UDP queue size
§ä´m¦Û¤vª�...@¤ù¤Ñ command@alexbbs.twbbs.org wrote:
I got a problem about UDP.
How do I get the UDP buffer size?
When the server had some delay in handling incoming UDP, it will lost
some package. I wonder it's because the system buffer size, is there any
ways to find the exactly size of the buffer?
ex:
client.py
import socket
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
for i in xrange(1000):
s.sendto('xxx', ('192.168.1.135',1))
server.py: in ip (192.168.1.135)
import socket
import time
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.bind(('',1))
time.sleep(10)
# here will only recv 255 package, others are lost...
for i in xrange(1000):
msg, addr = s.recvfrom(500)
print i
I think you want setsockopt...
import socket
import time
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.bind(('',1))
s.getsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF)
112640
s.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, 1048576)
s.getsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF)
262142
I ran the above on linux and I expect the limit 262144 is settable in
/proc/sys/net somewhere.
No idea whether the above works on windows!
--
Nick Craig-Wood n...@craig-wood.com -- http://www.craig-wood.com/nick
--
http://mail.python.org/mailman/listinfo/python-list
Re: walking a directory with very many files
On Wed, 17 Jun 2009 23:04:37 +1200 Lawrence D'Oliveiro l...@geek-central.gen.new_zealand wrote: In message 20090617142431.2b25f...@malediction, Mike Kazantsev wrote: On Wed, 17 Jun 2009 17:53:33 +1200 Lawrence D'Oliveiro l...@geek-central.gen.new_zealand wrote: Why not use hex representation of md5/sha1-hashed id as a path, arranging them like /path/f/9/e/95ea4926a4 ? That way, you won't have to deal with many-files-in-path problem ... Why is that a problem? So you can os.listdir them? Why should you have a problem os.listdir'ing lots of files? I shouldn't, and I don't ;) -- Mike Kazantsev // fraggod.net signature.asc Description: PGP signature -- http://mail.python.org/mailman/listinfo/python-list
Re: Measuring Fractal Dimension ?
On Jun 17, 4:18 pm, Mark Dickinson dicki...@gmail.com wrote: On Jun 17, 3:46 pm, Paul Rubin http://phr...@nospam.invalid wrote: Mark Dickinson dicki...@gmail.com writes: It looks as though you're treating (a portion of?) the Koch curve as the graph of a function f from R - R and claiming that f is uniformly continuous. But the Koch curve isn't such a graph (it fails the 'vertical line test', I think you treat it as a function f: R - R**2 with the usual distance metric on R**2. Right. Or rather, you treat it as the image of such a function, if you're being careful to distinguish the curve (a subset of R^2) from its parametrization (a continuous function R - R**2). It's the parametrization that's uniformly continuous, not the curve, and since any curve can be parametrized in many different ways any proof of uniform continuity should specify exactly which parametrization is in use. Mark I was being incredibly lazy and using loads of handwaving, seeing as I posted that (and this!) while procrastinating at work. an even lazier argument: given the _/\_ construct, you prove that its vertical growth is bound: the height of / is less than 1/3 (given a length of 1 for ___), so, even if you were to build _-_ with the middle segment at height = 1/3, the maximum vertical growth would be sum 1/3^n from 1 to infinity, so 0.5. Sideways growth has a similar upper bound. 0.5 1, so the chebyshev distance between any two points on the curve is = 1. Ergo, for any x,y, f(x) is at most at chebyshev distance 1 of (y). Induce the argument for smaller values of one. -- http://mail.python.org/mailman/listinfo/python-list
Re: UDP queue size
Scott David Daniels wrote: 找尋自己的一片天 wrote: I got a problem about UDP. How do I get the UDP buffer size? When the server had some delay in handling incoming UDP, it will lost some package. I wonder it's because the system buffer size, is there any ways to find the exactly size of the buffer? UDP is defined as best effort then give up, so _everything_ that handles a UDP packet is allowed to drop it; that means switchers, routers, ..., anything along the path to the target application. So, you cannot expect to do any better than a conservative guess, perhaps augmented by dynamic scaling. --Scott David Daniels scott.dani...@acm.org I would like to add, that you are most likely to lose packages because they are to big, I can not remember for sure if UDP had a fixed limit above what the MTU does, but you might want to look at that direction too. -- MPH http://blog.dcuktec.com 'If consumed, best digested with added seasoning to own preference.' -- http://mail.python.org/mailman/listinfo/python-list
Re: Executing a python script while it is running
On Jun 17, 1:42 am, Zach Hobesh hob...@gmail.com wrote: On Tue, Jun 16, 2009 at 6:37 PM, Chris Rebertc...@rebertia.com wrote: On Tue, Jun 16, 2009 at 6:21 PM, hob...@gmail.com wrote: Hey Dave, Thanks for the helpful responses. Option 2 is what you get by default. Naturally it depends on what the application is using to launch the batch file, but the most common cases will launch a separate process. The app ended up delaying starting the second batch file until it finished the first. I had the app trigger an infinite loop on completion, and sent two files through at the same time. The second file finished seconds after the first, but the batch file didn't trigger until I closed the first one. Are you sure you aren't unknowingly having the app wait on the first batch file process until it terminates? How exactly are you launching the batch files? Cheers, Chris -- http://blog.rebertia.com Hey Chris, I actually think that's what's happening, which is fine in my case (for now anyway) as I just need them all to complete, we don't need them running at the same time. I'm using a job management system, and they have the option of triggering a command line after completing a job. A better/safer solution might be spawning another job and re-inserting to the jms queue. Thanks again, Zach You might want to take a look at the Python-SIMPL toolkit (http:// www.icanprogram.com/06py/main.html). SIMPL uses a Send/Receive/Reply interprocess messaging scheme which will naturally queue requests for you. Without too much effort you may be able to reorient your scheme to eliminate the batch file entirely. bob -- http://mail.python.org/mailman/listinfo/python-list
exit() or sys.exit()
What is the difference on exit() and sys.exit() when called in the main body of a script? From the command line they seem to have the same effect. Aside: Just used a python dictionary in which the keys were compiled regular expressions. Provided a very elegant solution. Have to love it. -- http://mail.python.org/mailman/listinfo/python-list
Re: exit() or sys.exit()
Brendan wrote: What is the difference on exit() and sys.exit() when called in the main body of a script? From the command line they seem to have the same effect. In Python =2.4 you had to use sys.exit() because __builtins__.exit() griped: tch...@asgix:~$ python2.4 Python 2.4.4 (#2, Apr 15 2008, 23:43:20) [GCC 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)] on linux2 Type help, copyright, credits or license for more information. type(exit) type 'str' exit() Traceback (most recent call last): File stdin, line 1, in ? TypeError: 'str' object is not callable In 2.5, it's an instance of site.Quitter which is callable, allowing it to behave like sys.exit() (from my observations, __builtins__.exit() and sys.exit() behave the same). I tend to use sys.exit() because I've still got code running on machines mired at 2.4 -tkc -- http://mail.python.org/mailman/listinfo/python-list
Re: Executing a python script while it is running
On Jun 16, 3:48 pm, Zach Hobesh hob...@gmail.com wrote: A lot more information would be useful. What version of Python, and what operating system environment? Exactly what would you like to happen when the batch file is invoked a second time? I'm running Python 2.6.2 on Windows. I'm passing filenames to the batch files and I need all filenames to be processed. I can't have any fails. I'm working on logging any fails I do have so that I can maybe batch process at the end of the day. 2) let them both run as separate processes This sounds like a good option, but I'm not totally sure on how to go about this? 4) queue something to be processed when the first run finishes I had the same idea, but I believe it would involve having another python script run all day long, which wouldn't necessarily be a bad thing, but I'd like to explore other options as well. This sort of falls under both categories, 2 4, and it will probably be judged 'poor practice' by history. We're all historians now, I guess. Windows has what's called a 'named mutex' for interprocess synchro'tion. Start your new process, acquire their shared mutex by name, and block on it. You will have one process for each file, but only one will run at once. You won't even need to build a shared library; 'ctypes' will suffice. -- http://mail.python.org/mailman/listinfo/python-list
Re: Exotic Logics
Steven D'Aprano wrote: On Tue, 16 Jun 2009 22:46:14 -0700, William Clifford wrote: I was staring at a logic table the other day, and I asked myself, what if one wanted to play with exotic logics; how might one do it? This might be useful for you, and if not useful, at least it might blow your mind like it did mine. (This is not original to me -- I didn't create it. However, I can't find the original source.) Imagine for a moment that there are no boolean values. There are no numbers. They were never invented. There are no classes. There are no objects. There are only functions. Could you define functions that act like boolean values? And could you define other functions to operate on them? def true(x, y): return x def false(x, y): return y def print_bool(b): print b(true, false) String isn't considered object? Also, b/true()/false() is a function object, isn't it? Unless function is first-class, you can't pass them around like that, since you need a function pointer (a.k.a number); but if function is first-class then there it is an object. -- http://mail.python.org/mailman/listinfo/python-list
Re: Exotic Logics
On Jun 17, 1:44 am, Steven D'Aprano ste...@remove.this.cybersource.com.au wrote: On Tue, 16 Jun 2009 22:46:14 -0700, William Clifford wrote: I was staring at a logic table the other day, and I asked myself, what if one wanted to play with exotic logics; how might one do it? This might be useful for you, and if not useful, at least it might blow your mind like it did mine. (This is not original to me -- I didn't create it. However, I can't find the original source.) Imagine for a moment that there are no boolean values. There are no numbers. They were never invented. There are no classes. There are no objects. There are only functions. Could you define functions that act like boolean values? And could you define other functions to operate on them? snip I think high and low /voltages/, though continuous and approximate, might satisfy this. There are no such things as electrons, only variations in density of the luminiferous ether. -- http://mail.python.org/mailman/listinfo/python-list
Re: ODE, GUI, plotter in Python
There was just an announcement on this list and the scipy list for PyLab_Works, which sounds exactly like what you're looking for. I would not recommend starting over with a new simulator at this point. -Rob On Tue, Jun 16, 2009 at 12:00 PM, Alashaib...@ymail.com wrote: Hello everyone. I am starting on implementing a simulator using python, and since it's the first time I code in python would appreciate a few pointers: The simulator will use a coupled ODE for the most part of the simulation, I plan to use scipy. (Anything considered faster/better than scipy for solving coupled ODEs? ) I plan for a GUI program with network graph plotting. I am leaning towards using Qt for the GUI (internet forums seem to recommend it, anyone got other preferences? ) Since the GUI application will contain few buttons and a plot, I am planning to implement matplotlib into the GUI. But does anyone know if matplotlib allows for interaction with the graph plot? (say for a network simulation, allowing to right click on nodes and disable them for instance, or alter some other properties of nodes and/or links across them). I am just starting out, hence I'd rather get some advice and experiment a bit for my self as I go along. Thank you. -- http://mail.python.org/mailman/listinfo/python-list
Re: Exotic Logics
On Jun 17, 1:28 am, Steven D'Aprano ste...@remove.this.cybersource.com.au wrote: On Tue, 16 Jun 2009 22:46:14 -0700, William Clifford wrote: I was staring at a logic table the other day, and I asked myself, what if one wanted to play with exotic logics; how might one do it? First question: what's an exotic logics? Do you mean things like three-value logic, fuzzy logic, probabilistic reasoning, etc? You (OP) may be interested in the definitions of the fuzzy operators: and( x, y ) := min( x, y ) or( x, y ) := max( x, y ) not( x ) := 1 (one)- x nand( x, y ) := not( and( x, y ) ) = 1- min( x, y ) Defining 'xor' as '( x or y ) and ( not( x and y ) )', we have: xor( x, y ) := min( max( x, y ), 1- min( x, y ) ) However, defining 'xor' as '( x and not y ) or ( y and not x )', we don't have: xor( x, y ) := max( min( x, 1- y ), min( y, 1-x ) ) Good question. -- http://mail.python.org/mailman/listinfo/python-list
Re: Exotic Logics
On Jun 17, 5:37 pm, Lie Ryan lie.1...@gmail.com wrote: Steven D'Aprano wrote: On Tue, 16 Jun 2009 22:46:14 -0700, William Clifford wrote: I was staring at a logic table the other day, and I asked myself, what if one wanted to play with exotic logics; how might one do it? This might be useful for you, and if not useful, at least it might blow your mind like it did mine. (This is not original to me -- I didn't create it. However, I can't find the original source.) Imagine for a moment that there are no boolean values. There are no numbers. They were never invented. There are no classes. There are no objects. There are only functions. Could you define functions that act like boolean values? And could you define other functions to operate on them? def true(x, y): return x def false(x, y): return y def print_bool(b): print b(true, false) String isn't considered object? Also, b/true()/false() is a function object, isn't it? Unless function is first-class, you can't pass them around like that, since you need a function pointer (a.k.a number); but if function is first-class then there it is an object. What Steven was doing was implementing some of the more basic stuff from Lambda calculus in python. If you're implementing a different system in an existing language, you'll need to use _some_ facilities of the original language to interface with the outside world. Anyway, here's a sample interactive session I just tried: def a(stuff): ... print stuff ... def b(stuff): ... stuff(abc) ... b(a) abc functions are first-class citizens in python. -- http://mail.python.org/mailman/listinfo/python-list
Re: exit() or sys.exit()
On Jun 17, 1:33 pm, Tim Chase python.l...@tim.thechases.com wrote: Brendan wrote: What is the difference on exit() and sys.exit() when called in the main body of a script? From the command line they seem to have the same effect. In Python =2.4 you had to use sys.exit() because __builtins__.exit() griped: tch...@asgix:~$ python2.4 Python 2.4.4 (#2, Apr 15 2008, 23:43:20) [GCC 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)] on linux2 Type help, copyright, credits or license for more information. type(exit) type 'str' exit() Traceback (most recent call last): File stdin, line 1, in ? TypeError: 'str' object is not callable In 2.5, it's an instance of site.Quitter which is callable, allowing it to behave like sys.exit() (from my observations, __builtins__.exit() and sys.exit() behave the same). I tend to use sys.exit() because I've still got code running on machines mired at 2.4 -tkc Okay. Thanks. -- http://mail.python.org/mailman/listinfo/python-list
Re: Exotic Logics
On Jun 17, 10:04 am, Aaron Brady castiro...@gmail.com wrote: snip You (OP) may be interested in the definitions of the fuzzy operators: and( x, y ) := min( x, y ) or( x, y ) := max( x, y ) not( x ) := 1 (one)- x nand( x, y ) := not( and( x, y ) ) = 1- min( x, y ) Defining 'xor' as '( x or y ) and ( not( x and y ) )', we have: xor( x, y ) := min( max( x, y ), 1- min( x, y ) ) However, defining 'xor' as '( x and not y ) or ( y and not x )', we don't have: xor( x, y ) := max( min( x, 1- y ), min( y, 1-x ) ) Corollary: xor1( x, y ) === xor2( x, y ). Non-exhaustive demonstration, excerpt: def xor1( x, y ): ... return min( max( x, y ), 1- min( x, y ) ) ... def xor2( x, y ): ... return max( min( x, 1- y ), min( y, 1- x ) ) ... for i in range( 0, 11, 2 ): ... for j in range( 0, 11, 2 ): ... print i, j, xor2( x, y )*10, ' ', ... print 0 0 0.00 2 2.00 4 4.00 6 6.00 8 8.0 2 0 2.02 2 2.02 4 4.02 6 6.02 8 8.0 4 0 4.04 2 4.04 4 4.04 6 6.04 8 6.0 6 0 6.06 2 6.06 4 6.06 6 4.06 8 4.0 8 0 8.08 2 8.08 4 6.08 6 4.08 8 2.0 10 0 10.0 10 2 8.0 10 4 6.0 10 6 4.0 10 8 2.0 They appear to be equal. I forgot to mention, fuzzy values take on values from the continuous open or closed range 0 to 1. -- http://mail.python.org/mailman/listinfo/python-list
Re: Exotic Logics
On Jun 17, 11:59 am, Aaron Brady castiro...@gmail.com wrote: On Jun 17, 1:44 am, Steven D'Aprano ste...@remove.this.cybersource.com.au wrote: On Tue, 16 Jun 2009 22:46:14 -0700, William Clifford wrote: I was staring at a logic table the other day, and I asked myself, what if one wanted to play with exotic logics; how might one do it? This might be useful for you, and if not useful, at least it might blow your mind like it did mine. (This is not original to me -- I didn't create it. However, I can't find the original source.) Imagine for a moment that there are no boolean values. There are no numbers. They were never invented. There are no classes. There are no objects. There are only functions. Could you define functions that act like boolean values? And could you define other functions to operate on them? snip I think high and low /voltages/, though continuous and approximate, might satisfy this. There are no such things as electrons, I've got a Tesla coil if you'd like to meet some electrons personally. only variations in density of the luminiferous ether. -- http://mail.python.org/mailman/listinfo/python-list
Re: Exotic Logics
On Jun 17, 10:05 am, pdpi pdpinhe...@gmail.com wrote: On Jun 17, 5:37 pm, Lie Ryan lie.1...@gmail.com wrote: Steven D'Aprano wrote: On Tue, 16 Jun 2009 22:46:14 -0700, William Clifford wrote: I was staring at a logic table the other day, and I asked myself, what if one wanted to play with exotic logics; how might one do it? This might be useful for you, and if not useful, at least it might blow your mind like it did mine. (This is not original to me -- I didn't create it. However, I can't find the original source.) Imagine for a moment that there are no boolean values. There are no numbers. They were never invented. There are no classes. There are no objects. There are only functions. Could you define functions that act like boolean values? And could you define other functions to operate on them? def true(x, y): return x def false(x, y): return y def print_bool(b): print b(true, false) String isn't considered object? Also, b/true()/false() is a function object, isn't it? Unless function is first-class, you can't pass them around like that, since you need a function pointer (a.k.a number); but if function is first-class then there it is an object. What Steven was doing was implementing some of the more basic stuff from Lambda calculus in python. If you're implementing a different system in an existing language, you'll need to use _some_ facilities of the original language to interface with the outside world. Sir! Entropy levels are approaching dangerously low levels. We don't even have enough entropy to fi -- http://mail.python.org/mailman/listinfo/python-list
Re: Exotic Logics
On Jun 17, 10:23 am, Mensanator mensana...@aol.com wrote: On Jun 17, 11:59 am, Aaron Brady castiro...@gmail.com wrote: On Jun 17, 1:44 am, Steven D'Aprano ste...@remove.this.cybersource.com.au wrote: On Tue, 16 Jun 2009 22:46:14 -0700, William Clifford wrote: I was staring at a logic table the other day, and I asked myself, what if one wanted to play with exotic logics; how might one do it? This might be useful for you, and if not useful, at least it might blow your mind like it did mine. (This is not original to me -- I didn't create it. However, I can't find the original source.) Imagine for a moment that there are no boolean values. There are no numbers. They were never invented. There are no classes. There are no objects. There are only functions. Could you define functions that act like boolean values? And could you define other functions to operate on them? snip I think high and low /voltages/, though continuous and approximate, might satisfy this. There are no such things as electrons, I've got a Tesla coil if you'd like to meet some electrons personally. The Wall Street Journal ran an article about Asian pleasure markets; they provide a-- quote-- perfectly reasonable professional option. -- http://mail.python.org/mailman/listinfo/python-list
Pythonic way to overwrite a file
Hey all, hopefully a simple question.
I'm writing a simple python tool that opens a file, and does something like
for line in file.readlines():
temp.write(line.doStuff())
However, I want to provide the option do this in place, as in have the
destination file be the same as the source file. Currently, I am writing to
a temp file and then using os.system('mv %s %s' % (dstfile, srcfile)) to
copy the destination file onto the soruce file. This is extremely ugly
though, and will only work on unix based systems (I'm guessing, unless
windows has mv too). Is there a more pythonic way to do this? Ideally I'd
like to change the file as I go through it and not deal with a second file
at all. That wouldn't have any atomicity though... What would be the most
pythonic+safest way to do this?
Thanks in advance
--
http://mail.python.org/mailman/listinfo/python-list
Create 3D Surface / Contour (with vpython?)
Hi! How can I create a 3D surface (or something like the picture on the FAQ page http://www.vpython.org/contents/FAQ.html ) with python [or vpython]. Didnt find anything in the Documentation under graph Basically like a contourf diagram in 3D ( http://www.techsoft.de/german/documents/images/3D_contour2.jpg). I think you know what I mean. Reason: I want to simulate waves in a square basin. Hope I dont need to use hundrets of little spheres (in case of vpython) for the surface ;) Thanks alot - Philip -- http://mail.python.org/mailman/listinfo/python-list
Re: Pythonic way to overwrite a file
Cameron Pulsford wrote: Hey all, hopefully a simple question. I'm writing a simple python tool that opens a file, and does something like for line in file.readlines(): temp.write(line.doStuff()) However, I want to provide the option do this in place, as in have the destination file be the same as the source file. snip Is loading the whole file into memory an option? If so, this should work: filename = spam.txt lines = open(filename).readlines()# Read new = [somefunction(line) for line in lines] # Change open(filename, 'w').writelines(new) # Write If you want to stick with your original approach, but want it to work cross platform, then I think this is what you want: http://docs.python.org/library/shutil#shutil.move HTH, Ben -- http://mail.python.org/mailman/listinfo/python-list
Re: Pythonic way to overwrite a file
Cameron Pulsford wrote:
Hey all, hopefully a simple question.
I'm writing a simple python tool that opens a file, and does something
like
for line in file.readlines():
temp.write(line.doStuff())
However, I want to provide the option do this in place, as in have
the destination file be the same as the source file. Currently, I am
writing to a temp file and then using os.system('mv %s %s' %
(dstfile, srcfile)) to copy the destination file onto the soruce
file. This is extremely ugly though, and will only work on unix based
systems (I'm guessing, unless windows has mv too). Is there a more
pythonic way to do this? Ideally I'd like to change the file as I go
through it and not deal with a second file at all. That wouldn't have
any atomicity though... What would be the most pythonic+safest way to
do this?
Thanks in advance
Altering directly the file is dangerous, what if something goes wrong
during the process ?
Create a temp file and copying it if successful is your best bet.
I guess using python modules like tempfile and shutil are a pythonic
way to do it :
import tempfile
import shutil
In [14]: tempfile.NamedTemporaryFile?
Definition: tempfile.NamedTemporaryFile(mode='w+b', bufsize=-1,
suffix='', prefix='tmp', dir=None)
Docstring:
Create and return a temporary file.
Arguments:
'prefix', 'suffix', 'dir' -- as for mkstemp.
'mode' -- the mode argument to os.fdopen (default w+b).
'bufsize' -- the buffer size argument to os.fdopen (default -1).
The file is created as mkstemp() would do it.
Returns an object with a file-like interface; the name of the file
is accessible as file.name. The file will be automatically deleted
when it is closed.
In [7]: shutil.copy?
Definition: shutil.copy(src, dst)
Docstring:
Copy data and mode bits (cp src dst).
The destination may be a directory.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Pythonic way to overwrite a file
Essentially it just cleans up a source file of erroneous spaces and tabs and
can also convert tabs to spaces so loading the whole file into memory is
possibly an option. I am making this utility for personal use, and that
would definitely be fine, but if it turned out well I'd open source it and
then I wouldn't be so sure. This is only supposed to handle text files, so
when would reading it all into memory become too much for most computers?
I'm guessing there aren't many source files of too great a size.
On Wed, Jun 17, 2009 at 2:09 PM, Jean-Michel Pichavant
jeanmic...@sequans.com wrote:
Cameron Pulsford wrote:
Hey all, hopefully a simple question.
I'm writing a simple python tool that opens a file, and does something
like
for line in file.readlines():
temp.write(line.doStuff())
However, I want to provide the option do this in place, as in have the
destination file be the same as the source file. Currently, I am writing to
a temp file and then using os.system('mv %s %s' % (dstfile, srcfile)) to
copy the destination file onto the soruce file. This is extremely ugly
though, and will only work on unix based systems (I'm guessing, unless
windows has mv too). Is there a more pythonic way to do this? Ideally I'd
like to change the file as I go through it and not deal with a second file
at all. That wouldn't have any atomicity though... What would be the most
pythonic+safest way to do this?
Thanks in advance
Altering directly the file is dangerous, what if something goes wrong
during the process ?
Create a temp file and copying it if successful is your best bet.
I guess using python modules like tempfile and shutil are a pythonic way
to do it :
import tempfile
import shutil
In [14]: tempfile.NamedTemporaryFile?
Definition: tempfile.NamedTemporaryFile(mode='w+b', bufsize=-1,
suffix='', prefix='tmp', dir=None)
Docstring:
Create and return a temporary file.
Arguments:
'prefix', 'suffix', 'dir' -- as for mkstemp.
'mode' -- the mode argument to os.fdopen (default w+b).
'bufsize' -- the buffer size argument to os.fdopen (default -1).
The file is created as mkstemp() would do it.
Returns an object with a file-like interface; the name of the file
is accessible as file.name. The file will be automatically deleted
when it is closed.
In [7]: shutil.copy?
Definition: shutil.copy(src, dst)
Docstring:
Copy data and mode bits (cp src dst).
The destination may be a directory.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Observer implementations
Tobias Weber wrote: In article mailman.1631.1245160392.8015.python-l...@python.org, Mike C. Fletcher mcfle...@vrplumber.com wrote: See PyDispatcher for code to do this. That was the original problem. Got it now: if used inside the class definition dispatcher.connect will raise cannot create weak reference to 'classmethod' object. Outside (using Class.method) it works fine. Ah, I think you've got a logic problem there. The classmethod during class creation has no reference to the class being created, so if you were to call *that* thing it would blow up: class x( object ): @classmethod def y( cls, text ): print text y( 'No you do not!' ) if you were to create a reference to *that* thing (the decorated un-bound class method) it would never have the binding for cls, so it wouldn't do anything. The correct way IMO to bind after-class-creation (e.g. by a class decorator or metaclass) where you reference a bound class method. If you *really* want to do it this way, you can do something like this: class x( object ): @classmethod def y( cls, value ): pass dispatcher.connect( lambda *args: x.y( *args ), signal='hello' ) but ick. HTH, Mike -- Mike C. Fletcher Designer, VR Plumber, Coder http://www.vrplumber.com http://blog.vrplumber.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Regarding Python is scripting language or not
abhishek goswami wrote: Hi, I have very basic question about Python that do we consider pyhton as script language. I searched in google but it becomes more confusion for me. After some analysis I came to know that Python support oops . Can anyone Guide me that Python is Oject oriented programming language or Script language Abhishek Goswami Chennai Phone No -0996227099 ICC World Twenty20 England '09 exclusively on YAHOO! CRICKET http://in.rd.yahoo.com/tagline_cricket_3/*http://cricket.yahoo.com Both. Especially if you define the terms object oriented and scripting in terms of positive space (attributes that are present) instead of negative space (attributes that are not present). Python has all of the important features of OOP, but lacks some of the imposed constraints that some consider to be part of the definition of OOP (I personally do not consider the constraints to be central to a useful definition of OOP) Python has all of the important features that one would want in a scripting language (although it has a larger memory footprint than some scripting languages), but lacks many of limitations associated with toy languages. Python is somewhat unique in it's ability to fill both of these areas so well without being unnatural. In my opinion, it is extremely useful to have one language that serves as both a highly scalable full-featured OOP language and as an extremely simple scripting language, because it allows one to build a large complex system within which one can easily do scripting tasks. Proof that python is a scripting language: print Hello world Proof that python is an OOP language benefiting from scripting capabilities: Django comes to mind. There are hundreds of others out there, but instead of listing them, I think I will get back to programming. Ken -- http://mail.python.org/mailman/listinfo/python-list
Re: Regarding Python is scripting language or not
Jochen Schulz wrote: abhishek goswami: Can anyone Guide me that Python is Oject oriented programming language or Script language In my opinion, Python is both. But an objective answer would require you to define what you means by these terms. If, by object-oriented you mean everything has to be put into classes, then Python is not object-oriented. That depends on what you mean by 'put into classes' (and 'everything'). If you mean 'be an instance of a class', which I think is the most natural reading, then Python *is* object-oriented and, if I understand what I have read correctly (so that ints are just (unboxed) ints and not members of an int class), Java *is not*! If you mean 'be an attribute of a class' (which to me is not 'in') or textually located within a class statement, then I doubt an language qualifies. It is impossible for every class statement to lie within a class statement and I wonder whether any language requires all classes to be attributes of some class (as opposed to subclasses or instances). However, if 'everything' means 'everything but classes', then, as I understand, Java and some others qualify. If fact, if one views modules as classes that cannot be instanced or as classes with one instance, themselves, then Python also qualifies. Python also qualifies if you mean 'be in some attribute of a class' and view modules as classes. *All* modules are values of sys.modules, including builtins, __main__, and sys itself. If, by scripting language you mean Python is an error-prone toy language, unsuitable for large, serious projects, then Python is not a scripting language either. On the other hand, CPython is designed to be extended by and thereby script code written in C and C-wrapped Fortran. This is a big part of why it uses reference-counting for garbage collection. It also has functions for running other processes and interacting with other processes. Terry Jan Reedy -- http://mail.python.org/mailman/listinfo/python-list
Re: Exotic Logics
On Jun 17, 1:28 am, Steven D'Aprano ste...@remove.this.cybersource.com.au wrote: On Tue, 16 Jun 2009 22:46:14 -0700, William Clifford wrote: I was staring at a logic table the other day, and I asked myself, what if one wanted to play with exotic logics; how might one do it? First question: what's an exotic logics? Do you mean things like three-value logic, fuzzy logic, probabilistic reasoning, etc? Or do you mean logical operators others than and, or, xor, nand, nor, etc? Or both? Something else? The short answer is 'yes'. Obviously, I don't know much about this stuff. I was looking a table of different operators and their truth values and saw that these were just different ways of reading and comparing numbers. I wrote this code to explore this idea in a general sense and see where it leads and learn something about computers. [...] If (nearly) all your methods are static methods, chances are a class is the wrong solution. Why not just define the static methods as top-level functions? That is exactly how they started. I wrapped them up in an class because I thought I might want to create a bunch of them for testing and experimentation. I'm curious to see how combinations of functions give the same (or different) results. I've read one can do all of the 16 binary operations with clever uses of NAND or NOR. [SNIP] You're implementation seems rather confusing. I think that's partly because you use lots of abbreviated jargon terms that mean little or nothing to me: rdx, opr (operator?), lsd, pute. Sorry about the confusion. It's because I'm confused. I should check out a book on the subject. Thanks for your help. -- William Clifford -- http://mail.python.org/mailman/listinfo/python-list
Re: strptime issue in multi-threaded application
Christian wrote: Joe Holloway schrieb: ImportError: Failed to import _strptime because the import lockis [sic] held by another thread. The error message is my fault. The cause of the mistake is obvious: No worries. The error message is clear even with the minor typo, I just wanted to recreate it here in case someone is searching for it down the road. Like I mentioned, it's only happened on a couple occasions because the right conditions have to be in place, but something doesn't seem right about it. I thought I'd ask on the mailing list before going so far as to open a ticket, but feel free to direct me there if that's the appropriate place for this. I have an idea what might happen in your application. Is an import triggering the start of a thread? Not that I'm aware of. When the error is triggered, my module is simply calling into a library that's then calling into time.striptime(). The import that fails seems to be just a side effect of this. You can get around the issue by decoupling imports from thread startups. Your application should import all modules before it starts its threaded components. To give you a better idea of the scenario, this is a Django web application deployed inside a WSGI container (mod_wsgi+Apache2). Ultimately, I'm not sure I have any control over when the imports occur since the WSGI container is what's managing the threads and my application is just being plugged into that container, if that makes sense. Consider that two URL handlers are likely be implemented in separate modules and hence both require a different set of imports. If both are served concurrently and one of them is making the first call to strptime while the other one has acquired the import lock, this can fail. Failing is obviously better than deadlocking, but it seems like pushing the workaround higher up in the call stack would cause some serious abstraction leaks. I don't fully understand what was causing the original deadlock, but my module should be able to call into time.strptime without incurring an ImportError or a deadlock under any circumstance? For now you can decrease the severity of your issue by placing import _strptime next to import time somewhere in your code. Once it a module is loaded PyImport_ImportModuleNoBlock() will not fail to import it a second time. Thanks for the workaround. I'm not all that concerned about the functional impact this has on my application since it has only happened a couple of times over the course of 6 weeks or so. My intent was more to make it visible in case there's a deeper design issue that can be addressed. Take care, Joe -- http://mail.python.org/mailman/listinfo/python-list
Re: A simpler logging configuration file format?
On Jun 5, 9:07 pm, geoff.ba...@gmail.com wrote:
Hi all,
Some discussion about this has already taken place on the issue
tracker:
http://bugs.python.org/issue6136
and I thought I would summarise my comments there on this thread, for
people who have no need to look at that issue.
At the moment, if I want to add a new logger foo writing to its own
file foo to my config file, I have to repeat the name 7(!) times,
editing 3 different sections in the process:
Strictly speaking, you don't need to repeat the name foo 7 times.
1) Add foo to [loggers] and [handlers]. (These seem completely
pointless and were apparently added in anticipation of new
functionality that never happened).
You don't have to call the logger foo and the handler foo. The
names in the [loggers] and [handlers] section are just to allow the
system to cross-refer different entities (loggers, handlers,
formatters) declared in the config file. You could give the logger a
name of L1 and the handler a name of H1, for example.
2) Create the section
[logger_foo]
handler:foo
qualname:foo
level:INFO
Here, if you named your logger L1, the section would be [logger_L1],
not [logger_foo]. If you called your handler H1, then the handler line
would be handlers=H1. The qualname is foo because you choose to log
events to the logger named foo. It could be more specific, e.g.
myapp.mymodule.myfunctionalarea.
3) Create the section
[handler_foo]
class: FileHandler
args:(foo, a)
Here, if you named your handler H1, the section would be [handler_H1],
not [handler_foo]. You've also called the log file foo, which more
conventionally you might name foo.log.
In your simple example where everything is named foo, and you've
chosen to call cross-referencing handles within the file foo, then
naturally you repeat foo a lot of times. In an equivalent file
[loggers]
keys=root,L1
[handlers]
keys=H1
[logger_L1]
level=INFO
handlers=H1
qualname=foo
[handler_H1]
class=FileHandler
args=('foo.log', 'w')
foo only occurs twice.
Wondering how it got like this, I found this blog from soon after it
was released in 2004:
http://www.mechanicalcat.net/richard/log/Python/Simple_usage_of_Pytho...
Some of the verdicts are full of dead chickens and error prone,
horribly complicated , over-engineered. So along comes the
basicConfig method in 2005 which is supposed to address thes
concerns. But this can only be applied globally, not even to
individual loggers, so is only helpful for extremely basic usage
(everything to one target) as far as I can see. The config file is
still much as it was then.
Some of this is just a consequence of using ConfigParser. The existing
file format is not perfect or even complete (for example - no support
for filters), and was proposed on python-dev for review before the
logging package went into Python. The general consensus was that it
was OK for basic use, and IIRC several people considered it as +0 or
-0 because they envisaged doing their own thing (e.g. having the
logging configuration as just part of an application's overall
configuration). This is the reason configuration was put in a separate
sub-module - if it's not needed, it needn't be loaded. AFAICT since
basicConfig was introduced and later refined, there has not been much
feedback about the configuration file format being a problem - and
while that could be because no-one is using it, that's not borne out
by the evidence. There have been numerous instances on c.l.py where
questions have been raised about how to specify custom handlers in the
configuration file, so at least some people are using it or have used
it (the configuration functionality, I mean).
I'd really like to see the concept extended to encompass multiple
loggers and the config file. Allowing Logger.basicConfig should be
trivial. Writing a configuration format which took a section and
passed all the options in it to basicConfig would in my view lead to a
much friendlier syntax for normal usage.
Well, basicConfig is for basic configuration of the logging package as
a whole, not for configuring individual loggers or handlers. It's best
not to conflate loggers and handlers - basicConfig might appear to do
this because its arguments are partly specifying handler configuration
and partly logger configuration. This is because it's the simplest
case - one logger (the root logger) and one handler (according to the
relevant arguments passed in). The handler-related arguments are used
to create a default handler and/or formatter, the logging level is
specified by the level argument, and it's applied to the root logger.
It doesn't make sense to use the same approach if you are going to
configure multiple loggers and handlers; if the existing format is not
palatable, it's relatively easy to create your own format and write
code to parse it and load it, and then call the programmatic API to
configure logging appropriately. You mentioned on the bug tracker that
you are coming from a background of
Re: Exotic Logics
William Clifford wrote: same (or different) results. I've read one can do all of the 16 binary operations with clever uses of NAND or NOR. The book Laws of Form, by Spencer-Brown' is based on that observation, with nand/nor expanded to n-ary 'bag' functions (like sum() is). I recommend it, especially if you can find it in a library. tjr -- http://mail.python.org/mailman/listinfo/python-list
Re: Regarding Python is scripting language or not
Terry Reedy wrote: If you mean 'be an instance of a class', which I think is the most natural reading, then Python *is* object-oriented and, if I understand what I have read correctly (so that ints are just (unboxed) ints and not members of an int class), Java *is not*! A friend of mine calls Java and C++ class centric programming languanges. ;) Christian -- http://mail.python.org/mailman/listinfo/python-list
Re: Create 3D Surface / Contour (with vpython?)
On Wed, Jun 17, 2009 at 12:58 PM, Philip Gröger philip.groe...@googlemail.com wrote: Hi! How can I create a 3D surface (or something like the picture on the FAQ page http://www.vpython.org/contents/FAQ.html ) with python [or vpython]. Didnt find anything in the Documentation under graph Basically like a contourf diagram in 3D ( http://www.techsoft.de/german/documents/images/3D_contour2.jpg). I think you know what I mean. Reason: I want to simulate waves in a square basin. Hope I dont need to use hundrets of little spheres (in case of vpython) for the surface ;) Thanks alot - Philip -- http://mail.python.org/mailman/listinfo/python-list I suggest two alternatives, second one being the fancier: http://matplotlib.sourceforge.net/examples/mplot3d/surface3d_demo.html http://code.enthought.com/projects/mayavi/docs/development/html/mayavi/auto/mlab_helper_functions.html#enthought.mayavi.mlab.surf -- http://mail.python.org/mailman/listinfo/python-list
SHM and Touchpad
Hello! I am writing an application that requires access to the state of a synaptics touch pad on a laptop running Ubuntu Linux (for the number of fingers, pressure, x location, y location, etc). A different program using C++ accesses the information through SHM and I was hoping to do the same with Python. I looked in PyPi and I noticed that there was a module for SHM but I can not figure out where to download it from (http://pypi.python.org/pypi/shm). Does anyone have any suggestions? Thanks, Sam -- http://mail.python.org/mailman/listinfo/python-list
Re: Perl's @foo[3,7,1,-1] ?
On Wed, 2009-06-17 at 14:13 +0200, Jean-Michel Pichavant wrote: On Wed, Jun 17, 2009 at 04:14, Steven D'Aprano wrote: What's np.arange? import numpy as np -- Pierre delroth Bourdon delr...@gmail.com Étudiant à l'EPITA / Student at EPITA Perfect example of why renaming namespaces should be done only when absolutely required, that is, almost never. Jean-Michel I disagree. Renaming namespaces should always be done if it will help stop people from doing a 'from package import *'. However, example code should always include relevant imports. Cheers, Cliff -- http://mail.python.org/mailman/listinfo/python-list
Re: SHM and Touchpad
On Jun 17, 2009, at 3:56 PM, Sparky wrote: Hello! I am writing an application that requires access to the state of a synaptics touch pad on a laptop running Ubuntu Linux (for the number of fingers, pressure, x location, y location, etc). A different program using C++ accesses the information through SHM and I was hoping to do the same with Python. I looked in PyPi and I noticed that there was a module for SHM but I can not figure out where to download it from (http://pypi.python.org/pypi/shm). Does anyone have any suggestions? Hi Sam, I'm not familiar with that shm, however there was (and still is) a old Python IPC module called shm. It uses Sys V semaphores, not POSIX semaphores like the shm in pypi. The old shm module has been replaced by two newer ones. For Sys V IPC: http://semanchuk.com/philip/sysv_ipc/ For POSIX IPC: http://semanchuk.com/philip/posix_ipc/ The old shm module is still around on semanchuk.com but I'm not updating it anymore (the author is AWOL and I'm just the maintainer) and I don't recommend using it. HTH Philip -- http://mail.python.org/mailman/listinfo/python-list
Re: first full alpha release of PyLab_Works v0.3
edexter wrote: cut it says I am missing msvcp71.dll installing Microsoft Visual C++ 2005 Redistributable Package did not help.. I had simular problems with alot of installers I had saved (from installing on xp) but when I grabbed newer installers they all worked, could be the manifast I was looking forward to trying it out.. Did you tried this one? http://www.microsoft.com/downloads/details.aspx?FamilyID=200b2fd9-ae1a-4a14-984d-389c36f85647displaylang=en Found via: http://lmgtfy.com/?q=Microsoft+Visual+C%2B%2B+2005+SP1+Redistributable+Package+(x86)l=1 -- MPH http://blog.dcuktec.com 'If consumed, best digested with added seasoning to own preference.' -- http://mail.python.org/mailman/listinfo/python-list
logging.fileConfig limitations?
Hi all, I have an application that writes out its logs in a subfolder of the user's local data directory. Let's say our user's name is ßéäöÜ2. On my Windows XP machine, this logging path turns out to be: C:\Documents and Settings\ßéäöÜ2\Local Settings\Application Data\MyApp\MyApp.log My application has a bootstrap kind of application that sets up the application's subfolder and writes out the log config file. Notice that the user's name contains non-ASCII characters. So, I encode the path in UTF8 format before writing the log config file. My resulting log config is (the last line is the most important): - BEGIN [formatters] keys: normal [handlers] keys: rotatingfile [loggers] keys: root [formatter_normal] format: %(asctime)s %(levelname)s %(module)s: %(message)s [logger_root] level: DEBUG handlers: rotatingfile [handler_rotatingfile] class: handlers.RotatingFileHandler formatter: normal args: [C:/Documents and Settings/ßéäöÜ2/Local Settings/Application Data/MyApp/MyApp.log, a, 2*1024*1024, 5, None] - END Now it turns out that the logging module can't find C:/Documents and Settings/ßéäöÜ2/Local Settings/Application Data/MyApp/MyApp.log specified in the args section, and rightfully so because this is an encoded string. *There does not seem to be a way for me to specify the encoding of the string so that the logging module resolves the proper unicode path.* This is my key problem! Is there some way to accomplish what I want? One interesting observation: I did some poking around in the logging module shipped with Python 2.5. I put in some code in the Python logging module to force UTF8 decoding of the filename argument, the result of which was interesting: it would end up logging in C:\Documents and Settings\ßéäöÜ2\Local Settings\Application Data\MyApp\MyApp.txt (not MyApp.log !). I've done a little debugging and can't immediately figure out why this is happening. Any help would be greatly appreciated! Regards, Mani -- http://mail.python.org/mailman/listinfo/python-list
Re: SHM and Touchpad
On Jun 17, 2:09 pm, Philip Semanchuk phi...@semanchuk.com wrote: On Jun 17, 2009, at 3:56 PM, Sparky wrote: Hello! I am writing an application that requires access to the state of a synaptics touch pad on a laptop running Ubuntu Linux (for the number of fingers, pressure, x location, y location, etc). A different program using C++ accesses the information through SHM and I was hoping to do the same with Python. I looked in PyPi and I noticed that there was a module for SHM but I can not figure out where to download it from (http://pypi.python.org/pypi/shm). Does anyone have any suggestions? Hi Sam, I'm not familiar with that shm, however there was (and still is) a old Python IPC module called shm. It uses Sys V semaphores, not POSIX semaphores like the shm in pypi. The old shm module has been replaced by two newer ones. For Sys V IPC:http://semanchuk.com/philip/sysv_ipc/ For POSIX IPC:http://semanchuk.com/philip/posix_ipc/ The old shm module is still around on semanchuk.com but I'm not updating it anymore (the author is AWOL and I'm just the maintainer) and I don't recommend using it. HTH Philip Dear Philip, Thank you for your quick response, I will take a look at the link you provided. -- http://mail.python.org/mailman/listinfo/python-list
