ANN: Assembly Line 0.8.2
I have released an updated version of Assembly Line, my entry in PyWeek 6 and later the Pyggy Awards. http://media.pyweek.org/dl/1007/greg_pgF09/AssemblyLine-0.8.2.zip About Assembly Line --- Become a FADE! That's Factory Automation Design Engineer for Pixall Manufacturing, the world leader in pixellated products. We give you product designs from our RD department, and you design and build factories to manufacture them as efficiently possible. Make a good profit and you'll earn big bonuses and a huge salary! -- Greg -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
Re: hist without plotting
Nick Matzke wrote: Is there a way to run the numpy hist function or something similar and get the outputs (bins, bar heights) without actually producing the plot on the screen? (R has a plot = false option, something like this is what I'm looking for...) First hit googling for numpy hist led me to http://www.scipy.org/Tentative_NumPy_Tutorial#head-aa75ec76530ff51a2e98071adb7224a4b793519e So pylab.hist() plots and numpy.histogram() just calculates. Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: Display a list using PyQt
member Basu wrote: I'm writing an application with PyQt as the GUI toolkit. I have a function that returns a simple list and I would like to update a List View widget with it. However I can't get it to work. I'm not sure if I need to subclass one of the Model classes, because it is just a list. Can someone point me to a simple tutorial or give me instructions on how to go about doing this? The attached example should help. Also see the examples included with PyQt. -- Gerhard from PyQt4 import QtCore, QtGui import sys class MyDialog(QtGui.QDialog): def __init__(self, parent): super(QtGui.QDialog, self).__init__(parent) self.layout = QtGui.QVBoxLayout(self) self.resize(400, 300) self.listWidget = QtGui.QListWidget(self) self.layout.addWidget(self.listWidget) buttonBox = QtGui.QDialogButtonBox(self) buttonBox.setStandardButtons(QtGui.QDialogButtonBox.Ok) self.layout.addWidget(buttonBox) QtCore.QObject.connect(buttonBox, QtCore.SIGNAL(accepted()), self.accept) def set_list(self, lst): for item in lst: listItem = QtGui.QListWidgetItem(str(item), self.listWidget) def accept(self): selected_items = , .join([str(item.text()) for item in self.listWidget.selectedItems()]) print selected:, selected_items self.close() if __name__ == __main__: app = QtGui.QApplication(sys.argv) dlg = MyDialog(None) lst = [3,4,5] dlg.set_list(lst) dlg.exec_() -- http://mail.python.org/mailman/listinfo/python-list
Windows vista
Hi. My name is toru. I start learning python couple weeks ago. I install the compiler from python.org. but I cannot use the IDLE program. (command line works fine so far) the error screen says that the my personal fire wall is blocking the program to run. I am not sure how to fix this. By the way, I heard many people said that this is because I am using windows vista. Does anyone know how to use IDLE program on Windows Vista machine? thank you. -- http://mail.python.org/mailman/listinfo/python-list
Will multithreading make python less popular?
Hi everybody, I am an engineer. I am trying to improve my software development abilities. I have started programming with ruby. I like it very much but i want to add something more. According to my previous research i have designed a learning path for myself. It's like something below. 1. Ruby (Mastering as much as possible) 2. Python (Mastering as much as possible) 3. Basic C++ or Basic Java And the story begins here. As i search on the net, I have found that because of the natural characteristics of python such as GIL, we are not able to write multi threaded programs. Oooops, in a kind of time with lots of cpu cores and we are not able to write multi threaded programs. That is out of fashion. How a such powerful language doesn't support multi threading. That is a big minus for python. But there is something interesting, something like multi processing. But is it a real alternative for multi threading. As i searched it is not, it requires heavy hardware requirements (lots of memory, lots of cpu power). Also it is not easy to implement, too much extra code... After all of that, i start to think about omiting python from my carrier path and directly choosing c++ or java. But i know google or youtube uses python very much. How can they choose a language which will be killed by multi threading a time in near future. I like python and its syntax, its flexibility. What do you think about multi threading and its effect on python. Why does python have such a break and what is the fix. Is it worth to make investment of time and money to a language it can not take advantage of multi cores? Thank you... Rushen -- http://mail.python.org/mailman/listinfo/python-list
How to enum all the users from a windows domain via python win32net module?
I tried the command net user /DOMAIN in windows console(cmd.exe), and it showed me all the usernames in my domain without any problems. But when I tried it in python with these commands : info=win32net.NetUserEnum(DOMAIN_NAME,1), info=win32net.NetUserEnum(r\\DOMAIN_NAME,1),and info=win32net.NetUserEnum(DOMAIN_NAME,1), I all got the System Error 53 (The network path was not found) . What should I do, if I intend to enum all the users from a windows domain via python win32net module? -- http://mail.python.org/mailman/listinfo/python-list
Re: How to enum all the users from a windows domain via python win32net module?
vimuser wrote: I tried the command net user /DOMAIN in windows console(cmd.exe), and it showed me all the usernames in my domain without any problems. But when I tried it in python with these commands : info=win32net.NetUserEnum(DOMAIN_NAME,1), info=win32net.NetUserEnum(r\\DOMAIN_NAME,1),and info=win32net.NetUserEnum(DOMAIN_NAME,1), I all got the System Error 53 (The network path was not found) . What should I do, if I intend to enum all the users from a windows domain via python win32net module? -- http://mail.python.org/mailman/listinfo/python-list code import win32net import win32netcon dc = win32net.NetGetAnyDCName (None, None) resume = 0 while 1: (_users, total, resume) = \ win32net.NetUserEnum ( dc, 3, win32netcon.FILTER_NORMAL_ACCOUNT, resume, win32netcon.MAX_PREFERRED_LENGTH ) for _user in _users: print _user['name'], _user['home_dir'], _user['profile'] break if not resume: break /code TJG -- http://mail.python.org/mailman/listinfo/python-list
[Fwd: Re: Pythonic way to determine if a string is a number]
[Resending after a bounce from mailing list] pyt...@bdurham.com wrote: try: float (input) except ValueError: return False else: return True I follow the semantics, but I don't know why I would prefer the try/else technique over the simpler: try: float( input ) return True except ValueError: return False In this case, I don't think you would. At least I would say it's no more than 50/50 depending on taste and probably more like 60/40 in favour of your solution. However there are situations where try-except-else more naturally expresses the code intent. Of course I can't think of a single one now, and it's not an easy thing to search my codebase for so I'll just press send and then think of an example two seconds later! Really wanted to make sure you were aware of it as an option; the else clause on try-except (and its cousin the for-else clause) are easily overlooked / forgotten. TJG -- http://mail.python.org/mailman/listinfo/python-list
Re: Will multithreading make python less popular?
On 16 Feb., 10:34, rushen...@gmail.com wrote: Hi everybody, I am an engineer. I am trying to improve my software development abilities. I have started programming with ruby. I like it very much but i want to add something more. According to my previous research i have designed a learning path for myself. It's like something below. 1. Ruby (Mastering as much as possible) 2. Python (Mastering as much as possible) 3. Basic C++ or Basic Java And the story begins here. As i search on the net, I have found that because of the natural characteristics of python such as GIL, we are not able to write multi threaded programs. Oooops, in a kind of time with lots of cpu cores and we are not able to write multi threaded programs. That is out of fashion. How a such powerful language doesn't support multi threading. That is a big minus for python. On comp.lang.ruby David Masover wrote this at 29 Jul. 2008, 07:55: - Right now, Ruby shares a problem with Python called the GIL -- the Global (or Giant) Interpreter Lock. What this means is that only one Ruby instruction may execute at a time. So even though they're using separate OS threads, and even though different Ruby threads might run on different cores, the speed of your program (at least the Ruby part) is limited to the speed of a single core. - Please don't mix threads and parallel processing on more then one CPU core. Andreas -- http://mail.python.org/mailman/listinfo/python-list
Re: Will multithreading make python less popular?
Hi, Rushen! I'm also new to using Python but from what I've found, GIL is very intentional decision. It is one of the features of Python which make it so powerful. I believe that if it didn't have GIL, Python wouldn't be half near where it is now (regarding it as a language, community, platform support, popularity, ...). The most important question is do you really need multi-threading for what you do? There is lot of software which doesn't require mt at all, or could be written without mt. Also, if you haven't learnt C++ or Java yet, mt is not something you should be worried about in the near future - there are lot of other, more important things, you need to learn before opening door mt hell :-) Best, Aleksa On Mon, Feb 16, 2009 at 10:34, rushen...@gmail.com wrote: Hi everybody, I am an engineer. I am trying to improve my software development abilities. I have started programming with ruby. I like it very much but i want to add something more. According to my previous research i have designed a learning path for myself. It's like something below. 1. Ruby (Mastering as much as possible) 2. Python (Mastering as much as possible) 3. Basic C++ or Basic Java And the story begins here. As i search on the net, I have found that because of the natural characteristics of python such as GIL, we are not able to write multi threaded programs. Oooops, in a kind of time with lots of cpu cores and we are not able to write multi threaded programs. That is out of fashion. How a such powerful language doesn't support multi threading. That is a big minus for python. But there is something interesting, something like multi processing. But is it a real alternative for multi threading. As i searched it is not, it requires heavy hardware requirements (lots of memory, lots of cpu power). Also it is not easy to implement, too much extra code... After all of that, i start to think about omiting python from my carrier path and directly choosing c++ or java. But i know google or youtube uses python very much. How can they choose a language which will be killed by multi threading a time in near future. I like python and its syntax, its flexibility. What do you think about multi threading and its effect on python. Why does python have such a break and what is the fix. Is it worth to make investment of time and money to a language it can not take advantage of multi cores? Thank you... Rushen -- http://mail.python.org/mailman/listinfo/python-list -- Aleksa Todorovic - Lead Programmer Eipix Entertainment http://www.eipix.com/ -- http://mail.python.org/mailman/listinfo/python-list
explain
I download python 2.5.4 and install but I dont know that how perform python? I dont know from which directory perform python? Please explain for me. Thank you -- http://mail.python.org/mailman/listinfo/python-list
explain
I download python 2.5.4 and install but I dont know that how run python? I dont know from which directory run python? Please explain for me. Thank you -- http://mail.python.org/mailman/listinfo/python-list
Re: explain
-On [20090216 11:17], Saeed Iravani (si.4...@yahoo.com) wrote: I download python 2.5.4 and install but I dont know that how perform python? I dont know from which directory perform python? It would help if you would clarify which operating system you are using. On Unix/Linux systems you make sure to 'rehash' your $PATH or add the appropriate directory to the $PATH variable. On Windows, you set your environment variable PATH to include the path to Python programs (typically something like C:\Python25), which you can find under the system control panel. -- Jeroen Ruigrok van der Werven asmodai(-at-)in-nomine.org / asmodai イェルーン ラウフロック ヴァン デル ウェルヴェン http://www.in-nomine.org/ | http://www.rangaku.org/ | GPG: 2EAC625B Earth to earth, ashes to ashes, dust to dust... -- http://mail.python.org/mailman/listinfo/python-list
Re: Windows vista
-On [20090216 09:50], loveshadow...@yahoo.com (loveshadow...@yahoo.com) wrote: the error screen says that the my personal fire wall is blocking the program to run. My default Windows Vista x64 installation is not blocking my IDLE at all, so it might be you're not using the standard Windows firewall but perhaps some third-party one. Most of the time in the firewall configuration windows you can add specific executables to be allowed access. As such you probably have to point it to the C:\Python25\Python.exe file, but that's just a guess. -- Jeroen Ruigrok van der Werven asmodai(-at-)in-nomine.org / asmodai イェルーン ラウフロック ヴァン デル ウェルヴェン http://www.in-nomine.org/ | http://www.rangaku.org/ | GPG: 2EAC625B Earth to earth, ashes to ashes, dust to dust... -- http://mail.python.org/mailman/listinfo/python-list
Re: Will multithreading make python less popular?
On Feb 16, 10:34 am, rushen...@gmail.com wrote: Hi everybody, I am an engineer. I am trying to improve my software development abilities. I have started programming with ruby. I like it very much but i want to add something more. According to my previous research i have designed a learning path for myself. It's like something below. 1. Ruby (Mastering as much as possible) 2. Python (Mastering as much as possible) 3. Basic C++ or Basic Java And the story begins here. As i search on the net, I have found that because of the natural characteristics of python such as GIL, we are not able to write multi threaded programs. Oooops, in a kind of time with lots of cpu cores and we are not able to write multi threaded programs. That is out of fashion. How a such powerful language doesn't support multi threading. That is a big minus for python. But there is something interesting, something like multi processing. But is it a real alternative for multi threading. As i searched it is not, it requires heavy hardware requirements (lots of memory, lots of cpu power). Also it is not easy to implement, too much extra code... multiprocessing is already implemented for you in the standard library. Of course it does not require heavy hardware requirements. After all of that, i start to think about omiting python from my carrier path and directly choosing c++ or java. But i know google or youtube uses python very much. How can they choose a language which will be killed by multi threading a time in near future. I like python and its syntax, its flexibility. What do you think about multi threading and its effect on python. Why does python have such a break and what is the fix. Is it worth to make investment of time and money to a language it can not take advantage of multi cores? You can take advantage of multi cores, just not with threads but with processes, which BTW is the right way to go in most situations. So (assuming you are not a troll) you are just mistaken in thinking that the only way to use multicores is via multithreading. Michele Simionato -- http://mail.python.org/mailman/listinfo/python-list
Re: Will multithreading make python less popular?
2009/2/16 rushen...@gmail.com: Hi everybody, I am an engineer. I am trying to improve my software development abilities. I have started programming with ruby. I like it very much but i want to add something more. According to my previous research i have designed a learning path for myself. It's like something below. 1. Ruby (Mastering as much as possible) 2. Python (Mastering as much as possible) 3. Basic C++ or Basic Java And the story begins here. As i search on the net, I have found that because of the natural characteristics of python such as GIL, we are not able to write multi threaded programs. Oooops, in a kind of time with lots of cpu cores and we are not able to write multi threaded programs. That is out of fashion. How a such powerful language doesn't support multi threading. That is a big minus for python. In a way, you've answered your own question. Why are you learning three languages? Perhaps you've already realised that being Turing-complete isn't the last word in language choice; that different languages make different compromises, so the best language for one task may not be the best language for a different task. Ok, Python doesn't cope well with threading. It doesn't cope well with hard real-time, either. So what? A deep saucepan isn't much use for making an omlette (it can be done, but it's inefficient), but it's ideal for making soup. Just because multiple cores are available doesn't mean they will help your program significantly. Most real-world programs work just fine in a single core, and it usually just isn't worth all of the extra design effort, coding effort and debugging effort of threading to cut the user response time down from a tenth of a second to a twentieth. For *most* applications the single-thread Python programmer will have something written, shipped and doing the job whilst the multi-thread programmer is still trying to debug an intermittent livelock that goes away whenever instrumentation is added. For those few cases where threading is a genuine advantage, Python is not ideal. But in the real world I doubt they're enough to make a significant dent in Python's popularity. -- Tim Rowe -- http://mail.python.org/mailman/listinfo/python-list
Creating custom formatter function
Hello Python folks, I have a function where I'd like to prefix a format string via a `prefix' string. The definition of the base method is as follows: #START CODE def print_message(prefix, out_stream, fmt, *args, **kwargs): Print out [prefix]: [message] message = fmt if 0 len(kwargs.keys()): message = message % kwargs if 0 len(args): message = message % args out_stream.write(message + \n) #END CODE My python 2.4.5 interpreter fails at `message % args' claiming the following: File logging.py, line 10, in print_message message = message % (args) TypeError: not all arguments converted during string formatting Thus I was wondering what the proper means was for formatting strings. I'm new to this portion of Python, so I obviously didn't apply the right syntax. TIA! -Garrett -- http://mail.python.org/mailman/listinfo/python-list
Re: Will multithreading make python less popular?
Hi again, Dear Andreas I know about GIL in ruby interpreter, they are trying to solve problems because of GIL but it is not so important for me because i like ruby because of its esthetic and it helps me to grasp some programming concepts. As i know it is not so powerful language like java. (Powerful language : rich libraries, wide community, very variety of usage). why i want to learn python because it has syntax like ruby but it is also powerful language, not of course as much as java or c++ And also, i am trying to find an answer to the question mark in my head. Is there a way to use multi cores in python as much effective and easier as multi threading. Dear Aleksa Of course i have a long way to ago even if i am too old for these things. However, i think that being able to use both cores or more is a very big plus for execution time, speed like these. I believe many programs will be rewritten to be able to use multiple cores. Dear Michele As i know every process has own hardware sources like memory and cpu so i think it requires more source than multi threading. Dear Tim I want to learn python + c++ or java because of the desire of having python's felxibility and easiness and c++ or java's stability and speed and power together. Thank you Rushen -- http://mail.python.org/mailman/listinfo/python-list
Re: Will multithreading make python less popular?
2009/2/16 rushen...@gmail.com: I want to learn python + c++ or java because of the desire of having python's felxibility and easiness and c++ or java's stability and speed and power together. Yes, that's what I mean by different tradeoffs. Python is much easier to program in than C++ or Java (in my experience, at least), but C++ and Java scale better and at least have the potential to be faster. I'm not convinced that library support is significantly better for C++ or Java -- Python's libraries seem pretty rich to me. And that extra speed might not be needed as often as you think. My postgrad dissertation involved heavy number-crunching on large data sets, and in my proposal I said I'd switch from Python to C++ when Python got too slow. In fact, Python never did get too slow (I didn't even have to switch to numpy), and plugging together ad-hoc modules, defined in an XML script, was a dream in Python when I'd probably still be coding it today in C++. Horses for courses. It's almost always wrong to say that language A is better than language B; the most you can say is that language A is better than language B for some specific task. -- Tim Rowe -- http://mail.python.org/mailman/listinfo/python-list
Re: Module to read/write MIDI ?
I had my first look around pypi.python.org/pypi yesterday and didn't see anything. Is there a MIDI-module for Python ? If not, I'll email Sean to ask if he'd mind me translating his module into Python3... http://www.mxm.dk/products/public/pythonmidi This is the only project I have seen that aims to do that - I haven't actually used it, and there might be others out there (I believe pygame www.pygame.org supports midi-output). Regards, Peter -- http://mail.python.org/mailman/listinfo/python-list
replace ftp by local copy
I have been given an old python application that calls ftplib in many places to copy files to a remote server. I have been given the task of cloneing this code so that ftp is not used, but files are just copied locally in a scenerio where ftp is not available. The code is not well structured which makes this more difficult. Before starting this just wondered if anyone has previously done anything like overriding the ftplib module so that I can leave the existing code largely unchanged but have the ftp commands just copy files locally? Just thought I'd ask before getting started. -- http://mail.python.org/mailman/listinfo/python-list
logging and daemons
Hello. I'm in the process of replacing a custom logger class in one of my apps that has several daemons. In the last step of daemonizing a program, after closing fds, stderr and stdout are redirected to the logfile of the program. Now, I'm trying to use TimedRotatingFileHandler as the only channel when the programs run in daemon mode. My problem is: I can't see a goog way to redirect stderr/stdout both to the logger. Note that I don't have any print statements in any of my code, but I can't be sure about all the modules I'm importing, and I like to get any uncached exception info that may go to stderr/stdout to show up in the logfiles. Any ideas? Thanks a lot, -- Fernando signature.asc Description: Digital signature -- http://mail.python.org/mailman/listinfo/python-list
Re: logging and daemons
On Mon, Feb 16, 2009 at 5:02 AM, Fernando M. Maresca fmare...@gmail.com wrote: Hello. I'm in the process of replacing a custom logger class in one of my apps that has several daemons. In the last step of daemonizing a program, after closing fds, stderr and stdout are redirected to the logfile of the program. Now, I'm trying to use TimedRotatingFileHandler as the only channel when the programs run in daemon mode. My problem is: I can't see a goog way to redirect stderr/stdout both to the logger. Note that I don't have any print statements in any of my code, but I can't be sure about all the modules I'm importing, and I like to get any uncached exception info that may go to stderr/stdout to show up in the logfiles. Any ideas? Thanks a lot, Hopefully this'll answer your question: You can actually set sys.std[err|out] to your ?file? descriptor of choice in python (it has to have read, write, and flush methods, IIRC to function). The only thing is (like all things dealing with multiple file descriptors like std[err|out]) the output may come in out of order due to flushing and insertion into the buffers, but it shouldn't be as much of an issue considering that the file descriptor for both items is the same descriptor, but this is just a note of forewarning. nose does something similar with the way that it scrapes stderr / stdout for exception data and messages. -Garrett -- http://mail.python.org/mailman/listinfo/python-list
Re: logging and daemons
Hello, thanks for the answer. On Mon, Feb 16, 2009 at 05:07:45AM -0800, Garrett Cooper wrote: You can actually set sys.std[err|out] to your ?file? descriptor of choice in python (it has to have read, write, and flush methods, IIRC to function). The only thing is (like all things dealing with multiple file descriptors like std[err|out]) the output may come in out of order due to flushing and insertion into the buffers, but it shouldn't be as much of an issue considering that the file descriptor for both items is the same descriptor, but this is just a note of forewarning. Yes, but I'm trying to use *TimedRotating*FileHandler, which makes the fd of the logfile change in every rotation of the logfile. So the direct approach of std[out|err] redirection to the logfile fd obtained from the logger instance is unusable (it works fine with a simple file handler). I'm looking into this because I really need rotating, because when debugging is on, large amounts of data are logged, and because I like the logging module approach in every aspect. Also, may it be possible to derive the class and add a file-like write method? Anyone using logging in this manner? Cheers, -- Fernando signature.asc Description: Digital signature -- http://mail.python.org/mailman/listinfo/python-list
Re: Will multithreading make python less popular?
rushen...@gmail.com wrote: Hi everybody, I am an engineer. I am trying to improve my software development abilities. I have started programming with ruby. I like it very much but i want to add something more. According to my previous research i have designed a learning path for myself. It's like something below. 1. Ruby (Mastering as much as possible) 2. Python (Mastering as much as possible) 3. Basic C++ or Basic Java And the story begins here. As i search on the net, I have found that because of the natural characteristics of python such as GIL, we are not able to write multi threaded programs. Oooops, in a kind of time with lots of cpu cores and we are not able to write multi threaded programs. That is out of fashion. How a such powerful language doesn't support multi threading. That is a big minus for python. But there is something interesting, something like multi processing. But is it a real alternative for multi threading. As i searched it is not, it requires heavy hardware requirements (lots of memory, lots of cpu power). Also it is not easy to implement, too much extra code... I understand why you are asking this question - you want to learn, and that is good - but as you say, you are a beginner, and you are focussing on one thing that has caught your eye when there are many other issues that are more important. The GIL is an implementation detail. I suspect that it could be largely removed if there was sufficient need. But that still wouldn't make Python a good language for programming on multiple cores. That's not as big a deal as you think, because we currently DON'T KNOW what would make a good language for programming on multiple cores - it's an open topic in the wider community. It may be, for example, that the best approaches for concurrent programming require a lot of automatic pre-processing that needs static type information. Or that mutable state is simply too much of a problem and pure functional programming is the only way forwards. Both of these would be much more serious problems for Python than the GIL. On the other hand, Python has inbuilt support for co-routines. Experience gained with that might lead towards a more actors-like solution that fits naturally within Python. So my first point is that you are worrying about a problem that no-one yet know how to solve, and worrying about a small and largely irrelevant part of that. Second, you are committing the common mistake of over-estimating the importance of efficiency. Python is not a fast language; it never has been. That does not stop it being extremely useful. This is largely because when it needs to do hard work it delegates to C libraries. Why can this not apply to concurrent programming too? Maybe the top level logic will stay in a single thread, because that is easier to program, but libraries will use multiple cores. So my second point is that you are being too restrictive in considering what a future solution might look like. In conclusion, then, I strongly suggest you stop worrying so much about things that you don't yet have the experience to see completely, and instead get more experience under your belt. That sounds more harsh than I really mean - obviously worrying about this kind of thing is part of learning. Incidentally, if you already know Ruby and want to improve your abilities I am not sure learning Python is the best use of your time. The two languages are very similar. You might be better taking a huge leap to something like Haskell or OCaml. Or, if you want to get hands-on experience of concurrency now, Erlang. Andrew After all of that, i start to think about omiting python from my carrier path and directly choosing c++ or java. But i know google or youtube uses python very much. How can they choose a language which will be killed by multi threading a time in near future. I like python and its syntax, its flexibility. What do you think about multi threading and its effect on python. Why does python have such a break and what is the fix. Is it worth to make investment of time and money to a language it can not take advantage of multi cores? Thank you... Rushen -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Will multithreading make python less popular?
andrew cooke wrote: something like Haskell or OCaml. Or, if you want to get hands-on experience of concurrency now, Erlang. I think for once I said something useful there. I think you would probably enjoy Erlang, and it would be very useful for understanding concurrency. Also, Erlang is not as strange a language as Haskell or OCaml. You will probably find it quite familiar. And there's an excellent book (Joe Armstrong's Programming Erlang). At the risk of hastening Python's demise :o) I strongly encourage you to learn Erlang instead of Python. Andrew -- http://mail.python.org/mailman/listinfo/python-list
Re: logging and daemons
On Mon, Feb 16, 2009 at 5:15 AM, Fernando M. Maresca fmare...@gmail.com wrote: Hello, thanks for the answer. On Mon, Feb 16, 2009 at 05:07:45AM -0800, Garrett Cooper wrote: You can actually set sys.std[err|out] to your ?file? descriptor of choice in python (it has to have read, write, and flush methods, IIRC to function). The only thing is (like all things dealing with multiple file descriptors like std[err|out]) the output may come in out of order due to flushing and insertion into the buffers, but it shouldn't be as much of an issue considering that the file descriptor for both items is the same descriptor, but this is just a note of forewarning. Yes, but I'm trying to use *TimedRotating*FileHandler, which makes the fd of the logfile change in every rotation of the logfile. So the direct approach of std[out|err] redirection to the logfile fd obtained from the logger instance is unusable (it works fine with a simple file handler). I'm looking into this because I really need rotating, because when debugging is on, large amounts of data are logged, and because I like the logging module approach in every aspect. I cannot comment about this because I haven't used this module before. Also, may it be possible to derive the class and add a file-like write method? Anyone using logging in this manner? Indeed, yes. That's sort of what I was hinting at with my statement that you must have a read, write and flush method for your class. Now that I think back, other modules like pexpect implement simple logic to deal with writing to psuedo file descriptors as well. Locking the data streams may or may not be required -- I'm not sure what the underlaying portions of python expose or do not expose in terms of scheduling in output streams. HTH, -Garrett -- http://mail.python.org/mailman/listinfo/python-list
Re: Will multithreading make python less popular?
Dear Andrew, I think reading beating the averages by paul graham before some experience is not a very good decision. :) Thank you Andrew -- http://mail.python.org/mailman/listinfo/python-list
Re: logging and daemons
Garrett Cooper wrote: On Mon, Feb 16, 2009 at 5:15 AM, Fernando M. Maresca fmare...@gmail.com wrote: Hello, thanks for the answer. On Mon, Feb 16, 2009 at 05:07:45AM -0800, Garrett Cooper wrote: You can actually set sys.std[err|out] to your ?file? descriptor of choice in python (it has to have read, write, and flush methods, IIRC to function). The only thing is (like all things dealing with multiple file descriptors like std[err|out]) the output may come in out of order due to flushing and insertion into the buffers, but it shouldn't be as much of an issue considering that the file descriptor for both items is the same descriptor, but this is just a note of forewarning. Yes, but I'm trying to use *TimedRotating*FileHandler, which makes the fd of the logfile change in every rotation of the logfile. So the direct approach of std[out|err] redirection to the logfile fd obtained from the logger instance is unusable (it works fine with a simple file handler). I'm looking into this because I really need rotating, because when debugging is on, large amounts of data are logged, and because I like the logging module approach in every aspect. I cannot comment about this because I haven't used this module before. Also, may it be possible to derive the class and add a file-like write method? Anyone using logging in this manner? Indeed, yes. That's sort of what I was hinting at with my statement that you must have a read, write and flush method for your class. Now that I think back, other modules like pexpect implement simple logic to deal with writing to psuedo file descriptors as well. Locking the data streams may or may not be required -- I'm not sure what the underlaying portions of python expose or do not expose in terms of scheduling in output streams. HTH, -Garrett -- http://mail.python.org/mailman/listinfo/python-list I use this, but for my own specialized purpose: import atexit class logger (object): def __init__ (self, name): self.name = name # final file name self.f = open (self.name, 'w') atexit.register (self.__del__) def write (self, stuff): self.f.write (stuff) def close (self): self.f.close() def flush (self): self.f.flush() def reopen (self): self.f.flush() self.f.close() os.rename (self.name, self.name + '.old') self.f = open (self.name, 'w') def __del__ (self): try: os.remove (self.name + '.old') except: pass -- http://mail.python.org/mailman/listinfo/python-list
to access the gretest
Vjrocks.comhttp://www.vjrocks.com/ BCA BCA Ist YEARhttp://www.vjrocks.com/BCA_Ist_year.html BCA IInd YEARhttp://www.vjrocks.com/BCA_IInd_year.html BCA IIIrd YEARhttp://www.vjrocks.com/BCA_IIIrd_year.html LANGUAGE Introduction to Computershttp://www.vjrocks.com/Introduction to Computers.html Programming IN Chttp://www.vjrocks.com/Introduction to Computers.html C++http://www.vjrocks.com/CPlusPlus.html Javahttp://www.vjrocks.com/Java.htmlVisual Basic.html Visual Basichttp://www.vjrocks.com/Visual Basic.html -- http://mail.python.org/mailman/listinfo/python-list
What is a phyton?
is phyton a programming language? what can a python do? how is it different from others? -- http://mail.python.org/mailman/listinfo/python-list
Re: Creating custom formatter function
On 2/16/2009 6:50 AM Garrett Cooper apparently wrote: I was wondering what the proper means was for formatting strings. http://docs.python.org/library/string.html#string-formatting http://docs.python.org/library/string.html#template-strings http://docs.python.org/library/stdtypes.html#string-formatting As for the last: values must be a tuple with exactly the number of items specified by the format string, or a single mapping object (for example, a dictionary) unless you need only a single argument in your format string. hth, Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list
Threads in PyGTK: keep typing while ping-ing
Dear All,
I have read several howtos for threading in PyGTK. I have tried some but with
no luck.
What i want is: i can keep typing in gtk.TextView while periodically doing ping
some hosts.
I think, the thread part is working since i can ping so fast (even for not
reply host, around 3 s for 27 no-reply-host). But, when the ping action is
running, i can not typing in textview. What i type while pinging will show up
after ping action is done.
(I am using 2.5.1, pygtk 2.10.6 on Linux x86)
This is my code:
import threading
import commands
import gtk
import gobject
gtk.gdk.threads_init()
class PingHost(threading.Thread):
def __init__(self, host):
threading.Thread.__init__(self)
self.host = host
self.result = ()
def run(self):
self.result = self.host, commands.getstatusoutput('ping %s -c1'
%(self.host))[0]
class Main:
def __init__(self):
self.win = gtk.Window()
self.win.connect('destroy', gtk.main_quit)
#
self.textb = gtk.TextBuffer()
self.textv = gtk.TextView(self.textb)
self.textv.set_size_request(500, 500)
#
self.win.add(self.textv)
self.win.show_all()
#
gobject.timeout_add(5000, self.do_ping)
def do_ping(self):
all_threads = []
#
for h in range(100, 105):
host = '192.168.0.%d' %(h)
#
worker = PingHost(host)
worker.start()
all_threads.append(worker)
#
for t in all_threads:
t.join()
print t.result
#
return True
if __name__ == '__main__':
app = Main()
gtk.main()
Any help would be appreciated :)
Best regards,
M
--
http://mail.python.org/mailman/listinfo/python-list
Re: Will multithreading make python less popular?
Or the other way around :-) Little off-topic, but... After several months of fighting with Java threads, dead locks, live locks, race conditions, I've rewritten my game server synchronization so that threads are executed in concurrent way (with only exceptions being socket sending and recieving threads), and all synchronization is implemented on top of Java blocking structures (little blasphemy: the way Stackless does it). After that change, the game suddenly started working like a charm! On Mon, Feb 16, 2009 at 13:24, rushen...@gmail.com wrote: Of course i have a long way to ago even if i am too old for these things. However, i think that being able to use both cores or more is a very big plus for execution time, speed like these. I believe many programs will be rewritten to be able to use multiple cores. -- Aleksa Todorovic - Lead Programmer Eipix Entertainment http://www.eipix.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Will multithreading make python less popular?
Dear Aleksa, As you mentioned, using multi cores makes programs more fast and more popular. But what about stackless python? Does it interpret same set of python libraries with Cpython or Does it have a special sub set? Thank you Rusen -- http://mail.python.org/mailman/listinfo/python-list
Re: What is a phyton?
* www.livtotravel.blogspot.com (Mon, 16 Feb 2009 05:45:09 -0800 (PST)) is phyton a programming language? http://en.wikipedia.org/wiki/Phyton -- http://mail.python.org/mailman/listinfo/python-list
Re: Threads in PyGTK: keep typing while ping-ing
On Mon, 16 Feb 2009 05:47:22 -0800 (PST), Mamahita Sela mamahitas...@yahoo.com wrote: Dear All, I have read several howtos for threading in PyGTK. I have tried some but with no luck. What i want is: i can keep typing in gtk.TextView while periodically doing ping some hosts. You don't need threads for this. The GTK mainloop supports socket event sources. This lets you deal with the GUI and with the network in a single thread without blocking anything. I think, the thread part is working since i can ping so fast (even for not reply host, around 3 s for 27 no-reply-host). But, when the ping action is running, i can not typing in textview. What i type while pinging will show up after ping action is done. This is because you're joining the threads in the GTK thread. Joining blocks until the thread being joined exits. While you're blocking the GTK thread like this, the GTK GUI is not updated. If you want to keep using threads, then you need a way to avoid joining the threads until you know they're done. Jean-Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: Turning a signature-changing decorator into a signature-preserving one
On Feb 14, 3:27 pm, Michele Simionato michele.simion...@gmail.com wrote: I lack the context to see how this could be fixed in your case, but this a not a show stopper, you can just keep the original decorator and forget about making itsignature preserving. I'm sorry for the possibly dumb question, but how can I do that? Thanks for all the time you've spent on this, Michele. - Gustavo. -- http://mail.python.org/mailman/listinfo/python-list
Re: What is a phyton?
Thorsten Kampe schrieb: * REMOVED(Mon, 16 Feb 2009 05:45:09 -0800 (PST)) is phyton a programming language? http://en.wikipedia.org/wiki/Phyton Thanks for quoting the OPs spam name so that the visibility of his post is increased. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: Turning a signature-changing decorator into a signature-preserving one
On Feb 16, 3:50 pm, Gustavo Narea m...@gustavonarea.net wrote: On Feb 14, 3:27 pm, Michele Simionato michele.simion...@gmail.com wrote: I lack the context to see how this could be fixed in your case, but this a not a show stopper, you can just keep the original decorator and forget about making itsignature preserving. I'm sorry for the possibly dumb question, but how can I do that? Thanks for all the time you've spent on this, Michele. - Gustavo. Let the original code as it is. If ain't broken, don't fix it. -- http://mail.python.org/mailman/listinfo/python-list
Re: Turning a signature-changing decorator into a signature-preserving one
On Feb 16, 3:56 pm, Michele Simionato michele.simion...@gmail.com wrote: On Feb 16, 3:50 pm, Gustavo Narea m...@gustavonarea.net wrote: On Feb 14, 3:27 pm, Michele Simionato michele.simion...@gmail.com wrote: I lack the context to see how this could be fixed in your case, but this a not a show stopper, you can just keep the original decorator and forget about making itsignature preserving. I'm sorry for the possibly dumb question, but how can I do that? Thanks for all the time you've spent on this, Michele. - Gustavo. Let the original code as it is. If ain't broken, don't fix it. But the problem is that it is broken. That decorator is for controller actions in Pylons-powered web applications (which are instance methods). Pylons inspects the action's signature to find what parameters it's going to pass to its instance method, which fails because my current decorator changes the signature. -- http://mail.python.org/mailman/listinfo/python-list
Re: Turning a signature-changing decorator into a signature-preserving one
On Feb 16, 4:07 pm, Gustavo Narea m...@gustavonarea.net wrote: But the problem is that it is broken. That decorator is for controller actions in Pylons-powered web applications (which are instance methods). Pylons inspects the action's signature to find what parameters it's going to pass to its instance method, which fails because my current decorator changes the signature. Yes, I am saying don't mess with the internal mechanism of Pylons and leave it as it was. Or was it broken from the beginning? The only reason I see for you to touch those things is if you are a Pylons core developer. -- http://mail.python.org/mailman/listinfo/python-list
Re: Will multithreading make python less popular?
andrew cooke and...@aorg wrote: The GIL is an implementation detail. I suspect that it could be largely removed if there was sufficient need. But that still wouldn't make Python a good language for programming on multiple cores. That's not as big a deal as you think, because we currently DON'T KNOW what would make a good language for programming on multiple cores - it's an open topic in the wider community. Those who do not study history are doomed to repeat it. Occam was the language that should have won the marketing prize, but didn't. - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: Turning a signature-changing decorator into a signature-preserving one
On Feb 16, 4:18 pm, Michele Simionato michele.simion...@gmail.com wrote: Yes, I am saying don't mess with the internal mechanism of Pylons and leave it as it was. Or was it broken from the beginning? The only reason I see for you to touch those things is if you are a Pylons core developer. It was broken from the beginning on Pylons. I'm a TurboGears 2 core developer, and TurboGears is powered by Pylons as of version 2. The decorator has always worked in TurboGears because of the way TG finds the action arguments, but now I'm working to make it work in Pylons too, but this is the only problem that has stopped me from making it work under Pylons. Thanks. -- http://mail.python.org/mailman/listinfo/python-list
RedHat 4
Hi, I need to confirm and certificate python 2.5 works in a RedHat Enterprise 4 and I don't know where I find that information. Please, if anybody knows some URL in RedHat or Python with this information email me. Thanks Germán Gutiérrez Gayoso Temuco -- http://mail.python.org/mailman/listinfo/python-list
Re: Python interface to ODF documents?
On Sun, 15 Feb 2009 22:03:25 +0200, Dotan Cohen wrote: Is there a Python interface to ODF documents? I'm thinking of something that will import, for example, an ADS spreadsheet into a multidimensional array (including formulas and formatting) and let me manipulate it, then save it back. Since python is one of OpenOffice.org's Macro language, depending on your need, you might be able to use that as well. -- http://mail.python.org/mailman/listinfo/python-list
Re: Turning a signature-changing decorator into a signature-preserving one
On Feb 16, 4:29 pm, Gustavo Narea m...@gustavonarea.net wrote: On Feb 16, 4:18 pm, Michele Simionato michele.simion...@gmail.com wrote: Yes, I am saying don't mess with the internal mechanism of Pylons and leave it as it was. Or was it broken from the beginning? The only reason I see for you to touch those things is if you are a Pylons core developer. It was broken from the beginning on Pylons. I'm a TurboGears 2 core developer, and TurboGears is powered by Pylons as of version 2. The decorator has always worked in TurboGears because of the way TG finds the action arguments, but now I'm working to make it work in Pylons too, but this is the only problem that has stopped me from making it work under Pylons. Thanks. I see. I would ask on the Pylons list. I suspect a bound method is passed and that you will need to extract the corresponding function with .im_func, then making sure that you pass the self argument correctly. But this is wild guess since I have no idea of how Pylons decorators work internally as compared to TurboGears decorators. -- http://mail.python.org/mailman/listinfo/python-list
Re: RedHat 4
It *works* in RHEL 4, but it doesn't come as a package. RHEL4 ships with Python 2.3, and RHEL 5 only ships with Python 2.4, even though 2.5 had been out for god knows how long when it came out. Though I haven't tested it, I wouldn't recommend replacing the system's python binary with 2.5 if you do install it yourself. Instead, install it to python2.5, and set the shebang line (#!) on your scripts to point to /usr/local/bin/python2.5 (or wherever you install it). Cheers, Cliff On Mon, 2009-02-16 at 07:28 -0800, Germán Gutiérrez wrote: Hi, I need to confirm and certificate python 2.5 works in a RedHat Enterprise 4 and I don't know where I find that information. Please, if anybody knows some URL in RedHat or Python with this information email me. Thanks Germán Gutiérrez Gayoso Temuco -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Will multithreading make python less popular?
Hi, But there is something interesting, something like multi processing. But is it a real alternative for multi threading. As i searched it is not, it requires heavy hardware requirements (lots of memory, lots of cpu power). Not necessarily. For the memory, modern operating Systems can ustilize a copy on write semantics in their Applications virtual memory space. That means that after starting a new process with fork(), the new Process shares all physical Memory Pages with the original one as long a none of them writes to wome Memory. The first write is cought by the OS. Then the Page will be copied and the writing process will in future use the new copy of that page while the other one (or eventually many) stay with the original. Multiprocessing needs more Memory than well optimized Multithreading, but it is not as bad as it is often said. For the CPU: There are two things that make the difference here. One ist Context Switching. When the OS switches between two threads of the same Process, it does not need to change the memory lookup table. When switching between Processes that is always necessary. Switching from a Thread of Process A to a Thread of Process B is just like switching from A to B. Using Threads just increases the probability that the OS can do a faster Context Switch. So Threads are faster here, but it is not a too big issue as well. The Second Thing is Communication. With Threds you can simply use variables to communicate between Threads. To Prevent conflicting access to those Variables you will use e.g. mutexes. That can be done with Shared Memory as well. Shared Memory is a bit more difficult to handle than simply using the heap, but again the impact is not really so big. Google uses Processes for the Tabs in Chrome, because that way they get around many Memory Management Problems they would have with Threads or with a singlethreaded reactor. Using Processes is not per se a bad Idea. You pay a bit with Memory and CPU but in many situations you get a much simpler programming model. Christof -- http://mail.python.org/mailman/listinfo/python-list
Re: Turning a signature-changing decorator into a signature-preserving one
On Feb 16, 4:40 pm, Michele Simionato michele.simion...@gmail.com wrote: It was broken from the beginning on Pylons. I'm a TurboGears 2 core developer, and TurboGears is powered by Pylons as of version 2. The decorator has always worked in TurboGears because of the way TG finds the action arguments, but now I'm working to make it work in Pylons too, but this is the only problem that has stopped me from making it work under Pylons. Thanks. I see. I would ask on the Pylons list. I suspect a bound method is passed and that you will need to extract the corresponding function with .im_func, then making sure that you pass the self argument correctly. But this is wild guess since I have no idea of how Pylons decorators work internally as compared to TurboGears decorators. I've not seen anything special in Pylons or TurboGears 2 decorators, except that they are all functions that use the decorator package -- while my decorator is a class that doesn't use the decorator package yet. My attempt to turn that decorator into a signature preserving one using the decorator packages fails even on TurboGears 2. As of decorator 3.0.1, I get this error: TypeError: You are decorating a non function: unbound method SecurePanel.__before__ Isn't this caused by the fact that my decorator is a class, or the way such a class is defined (whose code is in the first post of the thread)? I can turn it into a function because I'm sure I'll work -- although I wanted a class to make it easier to customize. Thanks. -- http://mail.python.org/mailman/listinfo/python-list
Re: What is a phyton?
On 16 feb 2009, at 14:45, www.livtotravel.blogspot.com wrote: is phyton a programming language? what can a python do? how is it different from others? -- If i were to replace 'python' with 'french' would you be willing to write the answer in one email? it's gonna be a loong email... if you want to know, type the same questions in google... or start by reading http://www.python.org if you don;t want that, then maybe go to a zoo and follow the signs ;) gr Arno -- http://mail.python.org/mailman/listinfo/python-list
Re: Turning a signature-changing decorator into a signature-preserving one
On Feb 16, 4:59 pm, Gustavo Narea m...@gustavonarea.net wrote: On Feb 16, 4:40 pm, Michele Simionato michele.simion...@gmail.com wrote: It was broken from the beginning on Pylons. I'm a TurboGears 2 core developer, and TurboGears is powered by Pylons as of version 2. The decorator has always worked in TurboGears because of the way TG finds the action arguments, but now I'm working to make it work in Pylons too, but this is the only problem that has stopped me from making it work under Pylons. Thanks. I see. I would ask on the Pylons list. I suspect a bound method is passed and that you will need to extract the corresponding function with .im_func, then making sure that you pass the self argument correctly. But this is wild guess since I have no idea of how Pylons decorators work internally as compared to TurboGears decorators. I've not seen anything special in Pylons or TurboGears 2 decorators, except that they are all functions that use the decorator package -- while my decorator is a class that doesn't use the decorator package yet. My attempt to turn that decorator into a signature preserving one using the decorator packages fails even on TurboGears 2. As of decorator 3.0.1, I get this error: TypeError: You are decorating a non function: unbound method SecurePanel.__before__ Isn't this caused by the fact that my decorator is a class, or the way such a class is defined (whose code is in the first post of the thread)? I can turn it into a function because I'm sure I'll work -- although I wanted a class to make it easier to customize. Thanks. This is another attempt, where the decorator is a still a class but uses an auxiliary function: http://paste.chrisarndt.de/paste/38bf8a8443614464968d424e1f2d4182 However, that raises this exception: http://paste.chrisarndt.de/paste/f90bc9a058254e2ca5660882011752a7?wrap=no -- http://mail.python.org/mailman/listinfo/python-list
Re: Python interface to ODF documents?
Since python is one of OpenOffice.org's Macro language, depending on your need, you might be able to use that as well. That's not a bad idea. Thanks! -- Dotan Cohen http://what-is-what.com http://gibberish.co.il א-ב-ג-ד-ה-ו-ז-ח-ט-י-ך-כ-ל-ם-מ-ן-נ-ס-ע-ף-פ-ץ-צ-ק-ר-ש-ת ا-ب-ت-ث-ج-ح-خ-د-ذ-ر-ز-س-ش-ص-ض-ط-ظ-ع-غ-ف-ق-ك-ل-م-ن-ه-و-ي А-Б-В-Г-Д-Е-Ё-Ж-З-И-Й-К-Л-М-Н-О-П-Р-С-Т-У-Ф-Х-Ц-Ч-Ш-Щ-Ъ-Ы-Ь-Э-Ю-Я а-б-в-г-д-е-ё-ж-з-и-й-к-л-м-н-о-п-р-с-т-у-ф-х-ц-ч-ш-щ-ъ-ы-ь-э-ю-я ä-ö-ü-ß-Ä-Ö-Ü -- http://mail.python.org/mailman/listinfo/python-list
Re: Turning a signature-changing decorator into a signature-preserving one
On Feb 16, 4:59 pm, Gustavo Narea m...@gustavonarea.net wrote: I've not seen anything special in Pylons or TurboGears 2 decorators, except that they are all functions that use the decorator package -- while my decorator is a class that doesn't use the decorator package yet. My attempt to turn that decorator into a signature preserving one using the decorator packages fails even on TurboGears 2. As of decorator 3.0.1, I get this error: TypeError: You are decorating a non function: unbound method SecurePanel.__before__ Isn't this caused by the fact that my decorator is a class, or the way such a class is defined (whose code is in the first post of the thread)? I can turn it into a function because I'm sure I'll work -- although I wanted a class to make it easier to customize. Thanks. The decorator class is fine, the error in clearly in what you pass to the decorator. You are trying to decorate an unbound method SecurePanel.__before__: are you sure this is really what you want to decorate? Are you decorating automatically all methods of SecurePanel? I have already mentioned it, but you can extract the underlying function from the method by using SecurePanel.__before__.im_func if you really want. -- http://mail.python.org/mailman/listinfo/python-list
Re: Will multithreading make python less popular?
hi there, [snip] Google uses Processes for the Tabs in Chrome, because that way they get around many Memory Management Problems they would have with Threads or with a singlethreaded reactor. Using Processes is not per se a bad Idea. You pay a bit with Memory and CPU but in many situations you get a much simpler programming model. note also that one can bet on things like KSM [1] to further improve the memory situation. For example, we are investigating its use in the large (read heavy) application frameworks at CERN where the typical vmem footprint is ~2Gb. Running KSM together with a multiprocessing-based event loop manager, we managed to overcommit ~300% of the memory (ie: run 3 instances of our application on a 2Gb-per-core machine) cheers, sebastien [1] http://lwn.net/Articles/306642 -- http://mail.python.org/mailman/listinfo/python-list
RE: Changing the Image on a button
from Tkinter import * def do(): btn.configure(image = None) root = Tk() img1 = PhotoImage(file=bacon.gif) btn = Button(image = img1, command = do, text = hello ) btn.img = img1 btn.pack() root.mainloop() Try this change: from: btn.configure(image = None) to: img1.blank() -John E-mail message checked by Spyware Doctor (6.0.0.386) Database version: 5.11770 http://www.pctools.com/en/spyware-doctor-antivirus/ -- http://mail.python.org/mailman/listinfo/python-list
Re: [Python-Dev] RELEASED Python 3.0.1
On Sun, Feb 15, 2009 at 9:15 PM, Ned Deily n...@acm.org wrote: It would be great if someone could add OS X links for the 3.0.1 and 2.6.1 to the main download page, too: http://www.python.org/download/ I've now added them to the main download page. -- Regards, Benjamin -- http://mail.python.org/mailman/listinfo/python-list
Re: Windows vista
On Feb 16, 1:46 am, loveshadow...@yahoo.com wrote: Hi. My name is toru. I start learning python couple weeks ago. I install the compiler from python.org. but I cannot use the IDLE program. (command line works fine so far) the error screen says that the my personal fire wall is blocking the program to run. I am not sure how to fix this. By the way, I heard many people said that this is because I am using windows vista. Does anyone know how to use IDLE program on Windows Vista machine? thank you. On my Vista machine I reply to a firewall popup the first time I run IDLE and tell it to allow IDLE to open a port. The next time I run IDLE, all is OK. I still have the problem that sometimes IDLE does not properly cleanup hung processes, which means IDLE will not restart. Dick Johnson -- http://mail.python.org/mailman/listinfo/python-list
Re: Threads in PyGTK: keep typing while ping-ing
On 16 Feb, 14:47, Mamahita Sela mamahitas...@yahoo.com wrote:
Dear All,
I have read several howtos for threading in PyGTK. I have tried some but with
no luck.
What i want is: i can keep typing in gtk.TextView while periodically doing
ping some hosts.
I think, the thread part is working since i can ping so fast (even for not
reply host, around 3 s for 27 no-reply-host). But, when the ping action is
running, i can not typing in textview. What i type while pinging will show up
after ping action is done.
(I am using 2.5.1, pygtk 2.10.6 on Linux x86)
This is my code:
import threading
import commands
import gtk
import gobject
gtk.gdk.threads_init()
class PingHost(threading.Thread):
def __init__(self, host):
threading.Thread.__init__(self)
self.host = host
self.result = ()
def run(self):
self.result = self.host, commands.getstatusoutput('ping %s -c1'
%(self.host))[0]
class Main:
def __init__(self):
self.win = gtk.Window()
self.win.connect('destroy', gtk.main_quit)
#
self.textb = gtk.TextBuffer()
self.textv = gtk.TextView(self.textb)
self.textv.set_size_request(500, 500)
#
self.win.add(self.textv)
self.win.show_all()
#
gobject.timeout_add(5000, self.do_ping)
def do_ping(self):
all_threads = []
#
for h in range(100, 105):
host = '192.168.0.%d' %(h)
#
worker = PingHost(host)
worker.start()
all_threads.append(worker)
#
for t in all_threads:
t.join()
print t.result
#
return True
if __name__ == '__main__':
app = Main()
gtk.main()
Any help would be appreciated :)
Best regards,
M
As you have been already told, join() blocks until the thread is
terminated. and you should avoid that.
A simple fix could by add a timeout to t.join, doing something like :
t.join(JOIN_TIMEOUT);
if not t.isAlive():
print t.result
Anywway, starting a thread for each ping is not very efficient, so you
could do better by having a 'ping server thread'
that repeatedly performs the following steps:
- accepts ping command on a queue.Queue
- ping the target and waits for the result
- publish the result on another queue.Queue
At this point, the do_ping action should:
- send a ping command to the oping server
- check (in non blocking mode) if there is any result on the ping
results queue
- display the result, if any
Another big speedup would be to avoid spawning a subprocess fro each
ping and instead
using directly sockets to send ICMP packets, using recipes like this :
http://code.activestate.com/recipes/409689/
Ciao
--
FB
--
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Re: Turning a signature-changing decorator into a signature-preserving one
On Feb 16, 5:18 pm, Michele Simionato michele.simion...@gmail.com wrote: On Feb 16, 4:59 pm, Gustavo Narea m...@gustavonarea.net wrote: I've not seen anything special in Pylons or TurboGears 2 decorators, except that they are all functions that use the decorator package -- while my decorator is a class that doesn't use the decorator package yet. My attempt to turn that decorator into a signature preserving one using the decorator packages fails even on TurboGears 2. As of decorator 3.0.1, I get this error: TypeError: You are decorating a non function: unbound method SecurePanel.__before__ Isn't this caused by the fact that my decorator is a class, or the way such a class is defined (whose code is in the first post of the thread)? I can turn it into a function because I'm sure I'll work -- although I wanted a class to make it easier to customize. Thanks. The decorator class is fine, the error in clearly in what you pass to the decorator. You are trying to decorate an unbound method SecurePanel.__before__: are you sure this is really what you want to decorate? Are you decorating automatically all methods of SecurePanel? I have already mentioned it, but you can extract the underlying function from the method by using SecurePanel.__before__.im_func if you really want. Thank you very much, it works with SecurePanel.__before__.im_func! -- http://mail.python.org/mailman/listinfo/python-list
Re: logging and daemons
Fernando M. Maresca schrieb: Hello. I'm in the process of replacing a custom logger class in one of my apps that has several daemons. In the last step of daemonizing a program, after closing fds, stderr and stdout are redirected to the logfile of the program. Now, I'm trying to use TimedRotatingFileHandler as the only channel when the programs run in daemon mode. My problem is: I can't see a goog way to redirect stderr/stdout both to the logger. Note that I don't have any print statements in any of my code, but I can't be sure about all the modules I'm importing, and I like to get any uncached exception info that may go to stderr/stdout to show up in the logfiles. why don't you just replace the sys.stdout/sys.stdin objects with something that is file-like (supports a write-method, that should be enough in this case), and then simply write the data arriving to the logger instance of your trust. If other modules don't get overly tricky to bypass sys.stdout, that should capture all you output, regardless of the file descriptor issues. In the end, if a 3rd-party-module choses to open a filedescriptor itself write to that, there is nothing you can do about that. But usually, they don't behave that way. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: logging and daemons
On Feb 16, 1:15 pm, Fernando M. Maresca fmare...@gmail.com wrote: Yes, but I'm trying to use *TimedRotating*FileHandler, which makes the fd of the logfile change in every rotation of the logfile. So the direct approach of std[out|err] redirection to the logfile fd obtained from the logger instance is unusable (it works fine with a simple file handler). That's fine with a FileHandler, as long as you don't use e.g. logrotate - that would cause the fd to change, too. I'm looking into this because I really need rotating, because when debugging is on, large amounts of data are logged, and because I like the logging module approach in every aspect. You can capture the stuff written to std[out|err] using any file-like object, so there are other options beyond redirecting to the fd of the handler's fd or adding a write method to the logger. For example, if you create a simple class which duck-types the file-like object, you could create two instances, for stdout and stderr, and wire them into sys. At any point you choose, you can choose to forward the information collected to the log. Is all your stuff pure Python, or do you have C extensions or subprocesses which are C-based? Also, I assume you have a separate rotating log file per daemon - is that right? Regards, Vinay Sajip -- http://mail.python.org/mailman/listinfo/python-list
Re: Will multithreading make python less popular?
andrew cooke wrote: The best short to the GIL issue that I have read in a long time Thanks a lot for writing this, I'll be pointing to it from time to time. Were I writing such a thing I'd focus too much on the how (issues I know that non-GIL true concurrency faces), and not enough on the high level view. Bravo. --Scott David Daniels scott.dani...@acm.org -- http://mail.python.org/mailman/listinfo/python-list
Re: how can this iterator be optimized?
On Feb 14, 10:19 am, Paul McGuire pt...@austin.rr.com wrote: If func is expensive, you could try memoizing it. Then subsequent calls just do arg lookups. Michele Simianato has posted a good memoizing decorator on the Python wiki. -- Paul That's the trick! I almost forgot about that one. Thanks! -Basilisk96 -- http://mail.python.org/mailman/listinfo/python-list
chi squared (X2) in Python
I was wondering if anyone has done this in Python. I wrote two functions that do it (I think... see below), but I do not understand how to interpret the results. I'm doing an experiment to implement ent in Python. ent tests the randomness of files and chi squared is probably the best test for this purposes when compared to other tests. Many of the statistical tests are easy (like Arithmetic Mean, etc) and I have no problems interpreting the results from those, but chi squared has stumped me. Here are my two simple functions, run them if you like to better understand the output: import os import os.path def observed(f): # argument f is a filepath/filename # # Return a list of observed characters in decimal ord(char). # Decimal value of characters may be 0 through 255. # [43, 54, 0, 255, 4, etc.] chars = [] #print f fd = open(f, 'rb') bytes = fd.read(13312) fd.close() for byte in bytes: chars.append(ord(byte)) #print chars if len(chars) != 13312: print Wait... chars does not equal 13312 in observed!!! return None else: return chars def chi(char_list): # Expected frequency of characters. I arrived at this like so: # expected = number of observations/number of possibilities # 52 = 13312/256 expected = 52.0 print observed\texpected\tx2 # 0 - 255 for x in range(0,256): observed = 0 for char in char_list: if x == char: observed +=1 # The three chi squared calculations # one = observed - expected # two = one squared # x2 = two/expected # x2 = (observed - expected) squared # #expected one = observed - expected two = one * one x2 = two/expected print observed, \t, expected, \t, x2 chi(observed(filepath)) The output looks similar to this: observedexpectedx2 62 52.01.92307692308 46 52.00.692307692308 60 52.01.23076923077 68 52.04.92307692308 I know this is a bit off-topic here, just hoping someone could help me interpret the x2 variable. After that, I'll be OK. I need to sum up things to get an overall x2 for the bytes I've read, but before doing that, I wanted to post this note. Please feel free to comment on any aspect of this. If I've got something entirely wrong, let me know. BTW, I selected 13KB (13,312) as it seems to be efficient and a decent size to test, the data could be any amount (up to and including the whole file) above this. Thanks, Tiff -- http://mail.python.org/mailman/listinfo/python-list
Re: how to distribute python extensions independently of python
On 2009-02-12 18:38, Travis wrote: So, Recently I made a fix to the zlib module that I need for use at work. I would like other employees to be able to use it without recompiling python. I assume I can just rename it and distribute it as a python extension. I was wondering how I can provide a way for other employees to build it. I saw a Universal Unix Makefile for Python extensions that looks promising. Is this the accepted way to compile python extensions still? Not really. That approach was abandoned years ago in favor of a distutils approach: http://docs.python.org/distutils/index.html in particular: http://docs.python.org/distutils/setupscript.html#describing-extension-modules -- Marc-Andre Lemburg eGenix.com Professional Python Services directly from the Source (#1, Feb 16 2009) Python/Zope Consulting and Support ...http://www.egenix.com/ mxODBC.Zope.Database.Adapter ... http://zope.egenix.com/ mxODBC, mxDateTime, mxTextTools ...http://python.egenix.com/ ::: Try our new mxODBC.Connect Python Database Interface for free ! eGenix.com Software, Skills and Services GmbH Pastor-Loeh-Str.48 D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg Registered at Amtsgericht Duesseldorf: HRB 46611 http://www.egenix.com/company/contact/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Pythonic way to determine if one char of many in a string
* pyt...@bdurham.com pyt...@bdurham.com [2009-02-16 00:48:34 -0500]: Nicolas, I would go for something like: for char in word: if char in 'aeiouAEIUO': char_found = True break else: char_found = False It is clear (imo), and it is seems to be the intended idiom for a search loop, that short-circuits as soon as a match is found. Thank you - that looks much better that my overly complicated attempts. Are there any reasons why I couldn't simplify your approach as follows? for char in word: if char in 'aeiouAEIUO': return True return False If you want to put this in its own function, this seems to be the way to go. Cheers, -- Nicolas Dandrimont The nice thing about Windows is - It does not just crash, it displays a dialog box and lets you press 'OK' first. (Arno Schaefer's .sig) signature.asc Description: Digital signature -- http://mail.python.org/mailman/listinfo/python-list
Re: how to distribute python extensions independently of python
On 2009-02-12 11:38, Travis wrote: So, Recently I made a fix to the zlib module that I need for use at work. Would you mind contributing this fix back to Python? http://bugs.python.org/ If you don't want to go to the effort of making a patch, at least a description of the problem you encountered and a description of your fix would be helpful. -- Robert Kern I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth. -- Umberto Eco -- http://mail.python.org/mailman/listinfo/python-list
Re: logging and daemons
Fernando M. Maresca wrote: On Mon, Feb 16, 2009 at 05:07:45AM -0800, Garrett Cooper wrote: You can actually set sys.std[err|out] to your ?file? descriptor of choice in python Yes, but I'm trying to use *TimedRotating*FileHandler, which makes the fd of the logfile change in every rotation of the logfile. So the direct approach of std[out|err] redirection to the logfile fd obtained from the logger instance is unusable (it works fine with a simple file handler). Right, so you stick something in as stderr/stdout that talks to the logfile. That is, something like: import sys class MyFakeStdout(object): def flush(self): pass def write(self, text): code to actually do the logging sys.stderr = sys.stdout = MyFakeStdout() --Scott David Daniels scott.dani...@acm.org -- http://mail.python.org/mailman/listinfo/python-list
pythojn/xpath question...
hi... using libxml2dom as the xpath lib i've got a situation where i can have: foo=a.xpath( /html/body/table[2]/tr[45]/td) and i can get 11 as the number of returned td elements for the 45th row... this is as it should be. however, if i do: foo=a.xpath( /html/body/table[2]/tr) and then try to iterate through to the 45th tr, and try to get the number of td elements.. i can't seem to get the additional xpath that has to be used, i've tried a number of the following with no luck... l1 = libxml2dom.toString(tmp_[0]) print l1 = +l1+\n ldx = 0 for l in tmp_: print ld =+str(ldx) if ldx==45: #needs to be a better way... #l1 = libxml2dom.toString(tmp_[0]) l1 = libxml2dom.toString(l) #print = ,l1 q1 = libxml2dom b1 = q1.parseString(l1, html=1) #dd1 = b1.xpath(//td[not(@width)]) #data = b1.xpath(//td/font) #data = b1.xpath(//t...@valign='top'][not(@width)]) #data = b1.xpath(//child::td[position()0...@valign='top'][not(@width)]) #data = b1.xpath(//td/parent::*/t...@valign='top'][not(@width)]) #data = b1.xpath(//td[position()]) #data = b1.xpath(//parent::tr[position()=1]/td) data = b1.xpath(//t...@valign='top'][not(@width)]) it appears that i somehow need to get the direct child/node of the parent tr that's the td... it looks like using (//td... gets all the underlying child td... as opposed to the direct 1st level child/siblings... any thoughts/pointers would be appreciated... thanks... -- http://mail.python.org/mailman/listinfo/python-list
Re: Pythonic way to determine if one char of many in a string
On Mon, 2009-02-16 at 00:28 -0500, Nicolas Dandrimont wrote:
* pyt...@bdurham.com pyt...@bdurham.com [2009-02-16 00:17:37 -0500]:
I need to test strings to determine if one of a list of chars is
in the string. A simple example would be to test strings to
determine if they have a vowel (aeiouAEIOU) present.
I was hopeful that there was a built-in method that operated
similar to startswith where I could pass a tuple of chars to be
tested, but I could not find such a method.
Which of the following techniques is most Pythonic or are there
better ways to perform this type of match?
# long and hard coded but short circuits as soon as match found
if 'a' in word or 'e' in word or 'i' in word or 'u' in word or
... :
-OR-
# flexible, but no short circuit on first match
if [ char for char in word if char in 'aeiouAEIOU' ]:
-OR-
# flexible, but no short circuit on first match
if set( word ).intersection( 'aeiouAEIOU' ):
I would go for something like:
for char in word:
if char in 'aeiouAEIUO':
char_found = True
break
else:
char_found = False
(No, I did not forget to indent the else statement, see
http://docs.python.org/reference/compound_stmts.html#for)
It is clear (imo), and it is seems to be the intended idiom for a search
loop, that short-circuits as soon as a match is found.
If performance becomes an issue, you can tune this very easily, so it
doesn't have to scan through the string 'aeiouAEIOU' every time, by
making a set out of that:
vowels = set('aeiouAEIOU')
for char in word
if char in vowels:
return True
return False
Searching in a set runs in constant time.
Cheers,
--
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Re: Found a very nice, small, cross-platform GUI toolkit for Python.
On Feb 16, 2:34 am, Python Nutter pythonnut...@gmail.com wrote: Had a look and it is still under my radar unfortunately because of TkInter. OceanGUI Note: spelling is OcempGUI. Also, since google broke some of the links, here's that main link again: http://ocemp.sourceforge.net/gui.html has a lot of large decencies (Pygame, SDL libraries, PyObjC, etc.) to install on my system Well, to be fair, SDL is pretty commonly-used software and they offer binary downloads for Mac OS X and MS Windows. Pygame seems to provide the same. So, installation should be a breeze. to just to get a GUI thats no better loking than TkInter which comes pre-installed (no dependencies) on most every major platform. Well, of course, there *is* a dependency: you need Tcl/Tk installed. If I was writing a game I might be interested, but I'd want to do some serious skinning of that GUI to make it look better. I suppose so, but the point of my post was that by default it makes quite a nice GUI toolkit. For applications installing the full wxWidgets or Qt toolkits would be less disk space and dependcies than OceanGUI What? Qt and wX are *huge* compared to OcempGUI. and performance would probably be higher. Probably, but wX and Qt are written in C++. OcempGUI is pure Python, which would make it easier for the Python community to help extend, optimize, and maintain. TkInter also has many skins/themes you can add that makes it rather, although not 100% native looking on target systems. OcempGUI can also be themed as well. Though I'm not sure how much is out there yet. -- http://mail.python.org/mailman/listinfo/python-list
Re: Found a very nice, small, cross-platform GUI toolkit for Python.
For applications installing the full wxWidgets or Qt toolkits would be less disk space and dependcies than OceanGUI What? Qt and wX are *huge* compared to OcempGUI. Don't forget that many people will already have Qt already installed, such as KDE users, or those who use Skype, Google Earth, or Opera. Though KDE's Qt will likely be accessibily installed in a convinient place, though, I'm not so sure about those other examples. -- Dotan Cohen http://what-is-what.com http://gibberish.co.il א-ב-ג-ד-ה-ו-ז-ח-ט-י-ך-כ-ל-ם-מ-ן-נ-ס-ע-ף-פ-ץ-צ-ק-ר-ש-ת ا-ب-ت-ث-ج-ح-خ-د-ذ-ر-ز-س-ش-ص-ض-ط-ظ-ع-غ-ف-ق-ك-ل-م-ن-ه-و-ي А-Б-В-Г-Д-Е-Ё-Ж-З-И-Й-К-Л-М-Н-О-П-Р-С-Т-У-Ф-Х-Ц-Ч-Ш-Щ-Ъ-Ы-Ь-Э-Ю-Я а-б-в-г-д-е-ё-ж-з-и-й-к-л-м-н-о-п-р-с-т-у-ф-х-ц-ч-ш-щ-ъ-ы-ь-э-ю-я ä-ö-ü-ß-Ä-Ö-Ü -- http://mail.python.org/mailman/listinfo/python-list
wxPython and Croatian characters
Hello, I have problem with configuring my wxPython script to work with Croatian characters like: đ,š,ž,č,ć. Here is my simple script without wxPython (this script works): # -*- coding: utf-8 -*- s = hello normal string đšžćč print s ..here is my snippet with wxPython: text = wx.StaticText(self, -1,Matični broj,(0,100)) # in this example,we have character č ...when I run this text, it looks something like: Mati,some weird characters ,and ni Regards, John -- http://mail.python.org/mailman/listinfo/python-list
Re: pythojn/xpath question...
bruce schrieb: hi... using libxml2dom as the xpath lib i've got a situation where i can have: foo=a.xpath( /html/body/table[2]/tr[45]/td) and i can get 11 as the number of returned td elements for the 45th row... this is as it should be. however, if i do: foo=a.xpath( /html/body/table[2]/tr) and then try to iterate through to the 45th tr, and try to get the number of td elements.. i can't seem to get the additional xpath that has to be used, i've tried a number of the following with no luck... l1 = libxml2dom.toString(tmp_[0]) print l1 = +l1+\n ldx = 0 for l in tmp_: print ld =+str(ldx) if ldx==45: #needs to be a better way... #l1 = libxml2dom.toString(tmp_[0]) l1 = libxml2dom.toString(l) #print = ,l1 q1 = libxml2dom b1 = q1.parseString(l1, html=1) #dd1 = b1.xpath(//td[not(@width)]) #data = b1.xpath(//td/font) #data = b1.xpath(//t...@valign='top'][not(@width)]) #data = b1.xpath(//child::td[position()0...@valign='top'][not(@width)]) #data = b1.xpath(//td/parent::*/t...@valign='top'][not(@width)]) #data = b1.xpath(//td[position()]) #data = b1.xpath(//parent::tr[position()=1]/td) data = b1.xpath(//t...@valign='top'][not(@width)]) it appears that i somehow need to get the direct child/node of the parent tr that's the td... it looks like using (//td... gets all the underlying child td... as opposed to the direct 1st level child/siblings... any thoughts/pointers would be appreciated... - you don't give enough information, as you don't provide the html - the above code is obviously not the one running, as I can't see anything that's increasing your running variable ldx - using l as variable names is extremely confusing, because it's hard to distinguish from 1 (the number). Using l1 is even worse. - xpath usually counts from 1, whereas python is 0-based. As is your code. So you most probably have a off-by-one-error. - you should read a xpath-tutorial, as //td's purpose is to fetch *all* elements td from the document root, as it is clearly stated here: http://www.w3.org/TR/xpath#path-abbrev. So it's no wonder you get more than you expect. Direct child nodes are found by simply omitting the axis specifier. Diez -- http://mail.python.org/mailman/listinfo/python-list
To 3.0.2 or not to 3.0.2?
I discovered some remaining cmp() in 3.0.1, 38 minutes after Benjamin fixed them. :) Unfortunately, that means porting setuptools to 3.0.1 will be a bit difficult. So my question is: Will there be a 3.0.2 with those fixes, or should I add workaround code for 3.0.1? -- Lennart Regebro: Pythonista, Barista, Notsotrista. http://regebro.wordpress.com/ +33 661 58 14 64 -- http://mail.python.org/mailman/listinfo/python-list
Re: wxPython and Croatian characters
vedrandeko...@gmail.com schrieb: Hello, I have problem with configuring my wxPython script to work with Croatian characters like: đ,š,ž,č,ć. Here is my simple script without wxPython (this script works): # -*- coding: utf-8 -*- s = hello normal string đšžćč print s ..here is my snippet with wxPython: text = wx.StaticText(self, -1,Matični broj,(0,100)) # in this example,we have character č ...when I run this text, it looks something like: Mati,some weird characters ,and ni Unless you are using python 3.0 (which I doubt, afaik no wx available), your above coding declaration is useless for the shown piece of code, as it only applies to unicode literals, which are written with a preceding u. So umönsch ist doch nicht so schwer gives you an unicode literal, that wx might work with (don't know wx) And of course you need to make sure your editor produces utf-8 as output, otherwise the exercise is futile as well. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: logging and daemons
On Mon, Feb 16, 2009 at 10:11:51AM -0800, Scott David Daniels wrote: Fernando M. Maresca wrote: On Mon, Feb 16, 2009 at 05:07:45AM -0800, Garrett Cooper wrote: You can actually set sys.std[err|out] to your ?file? descriptor of choice in python Yes, but I'm trying to use *TimedRotating*FileHandler, which makes the fd of the logfile change in every rotation of the logfile. So the direct approach of std[out|err] redirection to the logfile fd obtained from the logger instance is unusable (it works fine with a simple file handler). Right, so you stick something in as stderr/stdout that talks to the logfile. That is, something like: import sys class MyFakeStdout(object): def flush(self): pass def write(self, text): code to actually do the logging sys.stderr = sys.stdout = MyFakeStdout() Thanks a lot for the input. That's pretty much what I'm doing right now, just wondered if were a cleanest way. Cheers, -- Fernando signature.asc Description: Digital signature -- http://mail.python.org/mailman/listinfo/python-list
Re: Found a very nice, small, cross-platform GUI toolkit for Python.
On Feb 16, 1:52 pm, Dotan Cohen dotanco...@gmail.com wrote: Don't forget that many people will already have Qt already installed, such as KDE users, or those who use Skype, Google Earth, or Opera. Though KDE's Qt will likely be accessibily installed in a convinient place, though, I'm not so sure about those other examples. Well, yes. KDE users will already have Qt installed (and maybe PyQt) but may groan at the prospect of having to install GTK+ and PyGTK. Gnome users will already have GTK+ installed (and maybe PyGTK), but may groan at having to install Qt and PyQt. However, both will likely have no qualms about installing SDL and Pygame (which are pretty small and also allow them to play various games as well). -- http://mail.python.org/mailman/listinfo/python-list
Re: Pythonic way to determine if one char of many in a string
An entirely different approach would be to use a regular expression: import re if re.search([abc], nothing expekted): print a, b or c occurs in the string 'nothing expekted' if re.search([abc], something expected): print a, b or c occurs in the string 'something expected' Best regards, Stefaan. -- http://mail.python.org/mailman/listinfo/python-list
Re: replace ftp by local copy
loial wrote: I have been given an old python application that calls ftplib in many places to copy files to a remote server. I have been given the task of cloneing this code so that ftp is not used, but files are just copied locally in a scenerio where ftp is not available. The code is not well structured which makes this more difficult. Before starting this just wondered if anyone has previously done anything like overriding the ftplib module so that I can leave the existing code largely unchanged but have the ftp commands just copy files locally? Just thought I'd ask before getting started. I don't remember anyone mentioning this, but it sounds like the soundest engineering approach, and the one least likely to induce breakage ... regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC http://www.holdenweb.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Easier to wrap C or C++ libraries?
Nick Craig-Wood n...@craig-wood.com writes: Christian Heimes li...@cheimes.de wrote: Hrvoje Niksic schrieb: Diez B. Roggisch de...@nospam.web.de writes: The answer is easy: if you use C, you can use ctypes to create a wrapper - with pure python, no compilation, no platform issues. The last part is not true. ctypes doesn't work on 64-bit architectures, nor does it work when Python is built with non-gcc Unix compilers ctypes works on 64bit systems, too. However it's a pain in the ... back to write code with ctypes that works across all platforms. I used to use ctypes for wrapper but eventually I switched to Cython. What sort of problems have you had? I find as long as I use the same types as the C code actually uses it all works fine. If on a 64 bit platform long is 64 bits then it will be under ctypes too. I apologize for the misinformation that ctypes doesn't work on 64-bit systems. The project I'm working on doesn't include ctypes, but it could be because we don't use GCC to build, or because we also need to support Win64. -- http://mail.python.org/mailman/listinfo/python-list
Speedup Bitmap Parser
Hello people, I'm writing a Bitmap parser for study purposes, however when I parse a bitmap file and when I paint that file in a window, the script take to much time. How can I optimize my script loops to be faster ? Here is the script http://pastebin.com/m652b8d65 Best Regards Jayson Reis -- http://mail.python.org/mailman/listinfo/python-list
Re: Found a very nice, small, cross-platform GUI toolkit for Python.
laplacia...@gmail.com a écrit : On Feb 16, 1:52 pm, Dotan Cohen dotanco...@gmail.com wrote: Don't forget that many people will already have Qt already installed, such as KDE users, or those who use Skype, Google Earth, or Opera. Though KDE's Qt will likely be accessibily installed in a convinient place, though, I'm not so sure about those other examples. Well, yes. KDE users will already have Qt installed (and maybe PyQt) but may groan at the prospect of having to install GTK+ and PyGTK. Gnome users will already have GTK+ installed (and maybe PyGTK), but may groan at having to install Qt and PyQt. However, both will likely have no qualms about installing SDL and Pygame (which are pretty small and also allow them to play various games as well). FWIW (and servers set aside, of course), I can hardly remember of any of linux box I worked one not having both GTK and KDE installed. -- http://mail.python.org/mailman/listinfo/python-list
Re: illegal list name
Sandra Quiles a écrit : Hello. I have followed the instructions of a post on Installing mailman on OS X 10.4, and got to step 7 and hit this error. (snip) So. illegal name error. it list listname as 'mailman@mycomputername' that's in response to the 'bin/newlist mailman' command Sorry, this has nothing to do with Python. Please refer to mailman's documentation, mailing list or whatever. also, I purchased the Postfix Enabler, but have no clue what to do with the software. Nor do I. Tips, advise, hand-holding welcomed. Start here: http://catb.org/~esr/faqs/smart-questions.html HTH -- http://mail.python.org/mailman/listinfo/python-list
flexible find and replace ?
Hi guys,
how would you do a clever find and replace, where the value replacing
the tag
is changing on each occurence ?
...TAGTAGTAG..TAG.
is replaced by this :
...REPL01REPL02REPL03..REPL04...
A better and clever method than this snippet should exist I hope :
counter = 1
while 'TAG' in mystring:
mystring=mystring.replace('TAG', 'REPL'+str(counter), 1)
counter+=1
...
(the find is always re-starting at the string beginning, this is not
efficient.
any ideas ? thanks,
Olivier
--
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Re: Found a very nice, small, cross-platform GUI toolkit for Python.
FWIW (and servers set aside, of course), I can hardly remember of any of linux box I worked one not having both GTK and KDE installed. I don't think that those netbooks come with Qt. And for a Windows installer, where one may want to package the toolkit with the program, a small toolkit may be nice. There is such an issue today on the Zim list, where including GTK in the installer bloated it to four times it's size. So it may be more of a download size for Windows users, than an installed size for Linux users (disk space is cheap, at least with traditional rotating hard drives). -- Dotan Cohen http://what-is-what.com http://gibberish.co.il א-ב-ג-ד-ה-ו-ז-ח-ט-י-ך-כ-ל-ם-מ-ן-נ-ס-ע-ף-פ-ץ-צ-ק-ר-ש-ת ا-ب-ت-ث-ج-ح-خ-د-ذ-ر-ز-س-ش-ص-ض-ط-ظ-ع-غ-ف-ق-ك-ل-م-ن-ه-و-ي А-Б-В-Г-Д-Е-Ё-Ж-З-И-Й-К-Л-М-Н-О-П-Р-С-Т-У-Ф-Х-Ц-Ч-Ш-Щ-Ъ-Ы-Ь-Э-Ю-Я а-б-в-г-д-е-ё-ж-з-и-й-к-л-м-н-о-п-р-с-т-у-ф-х-ц-ч-ш-щ-ъ-ы-ь-э-ю-я ä-ö-ü-ß-Ä-Ö-Ü -- http://mail.python.org/mailman/listinfo/python-list
Re: flexible find and replace ?
OdarR: how would you do a clever find and replace, where the value replacing the tag is changing on each occurence ? ...TAGTAGTAG..TAG. is replaced by this : ...REPL01REPL02REPL03..REPL04... You may use something like this (tested) replacing with the correct re function: import re def replacer(mobj): replacer.counter += 1 return REPL%02d % replacer.counter replacer.counter = 0 print re.(TAG, replacer, s1) (If you have more than 99 replacements it will use more than two digits.) Bye, bearophile -- http://mail.python.org/mailman/listinfo/python-list
Re: flexible find and replace ?
On Feb 16, 12:10 pm, OdarR olivier.da...@gmail.com wrote:
Hi guys,
how would you do a clever find and replace, where the value replacing
the tag
is changing on each occurence ?
...TAGTAGTAG..TAG.
is replaced by this :
...REPL01REPL02REPL03..REPL04...
A better and clever method than this snippet should exist I hope :
counter = 1
while 'TAG' in mystring:
mystring=mystring.replace('TAG', 'REPL'+str(counter), 1)
counter+=1
...
(the find is always re-starting at the string beginning, this is not
efficient.
any ideas ? thanks,
Olivier
You could split on the string and interleave your new string in
between:
In [1]: def replmaker():
...: index = 0
...: while True:
...: index += 1
...: yield REPL%02i%index
...:
In [2]: def spliton(string, tag=TAG, sepgen=replmaker):
...: repl_iter = sepgen()
...: strlist = string.split(tag)
...: length = len(strlist)
...: for index, item in enumerate(strlist):
...: yield item
...: if index length - 1:
...: yield repl_iter.next()
...:
In [3]: ''.join(spliton
(...TAGTAGTAG..TAG. ))
Out[3]:
'...REPL01REPL02REPL03..REPL04.'
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Re: wxPython and Croatian characters
On Feb 16, 10:58 am, vedrandeko...@gmail.com wrote: Hello, I have problem with configuring my wxPython script to work with Croatian characters like: ð,¹,¾,è,æ. Here is my simple script without wxPython (this script works): # -*- coding: utf-8 -*- s = hello normal string ð¹¾æè print s ..here is my snippet with wxPython: text = wx.StaticText(self, -1,Matièni broj,(0,100)) # in this example,we have character è ...when I run this text, it looks something like: Mati,some weird characters ,and ni Regards, John You may be using an ANSI build of wxWidgets instead of a unicode one. Make sure to enable Unicode when you run ./configure, or if in Windows, uninstall and download the win32-unicode version of the wxPython you want. -- http://mail.python.org/mailman/listinfo/python-list
Re: explain
Jeroen Ruigrok van der Werven wrote: -On [20090216 11:17], Saeed Iravani (si.4...@yahoo.com) wrote: I download python 2.5.4 and install but I dont know that how perform python? I dont know from which directory perform python? It would help if you would clarify which operating system you are using. On Unix/Linux systems you make sure to 'rehash' your $PATH or add the appropriate directory to the $PATH variable. On Windows, you set your environment variable PATH to include the path to Python programs (typically something like C:\Python25), which you can find under the system control panel. On windows, that is not necessary for many uses. Just use the entries in the start menu. -- http://mail.python.org/mailman/listinfo/python-list
Re: Creating custom formatter function
Garrett Cooper wrote: Hello Python folks, I have a function where I'd like to prefix a format string via a `prefix' string. The definition of the base method is as follows: #START CODE def print_message(prefix, out_stream, fmt, *args, **kwargs): Print out [prefix]: [message] message = fmt if 0 len(kwargs.keys()): message = message % kwargs if 0 len(args): To clarify error message, print fmt, message, args here message = message % args This line out_stream.write(message + \n) #END CODE My python 2.4.5 interpreter fails at `message % args' claiming the following: File logging.py, line 10, in print_message message = message % (args) does not quite match this one, so one is not copy/pasted. TypeError: not all arguments converted during string formatting Thus I was wondering what the proper means was for formatting strings. I'm new to this portion of Python, so I obviously didn't apply the right syntax. TIA! -Garrett -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Speedup Bitmap Parser
Jayson Santos wrote: Hello people, I'm writing a Bitmap parser for study purposes, however when I parse a bitmap file and when I paint that file in a window, the script take to much time. 1. You turned constants into static methods called for every line, adding attribute lookup and function call time. 2. You read the image a line at a time and break each line into separate pixel objects. 3. You paint each pixel by drawing and filling a 1-pixel rectangle. How can I optimize my script loops to be faster ? Don't do any of the above. Look at how other programs such as PIL or pygame read, store, and paint images. Here is the script http://pastebin.com/m652b8d65 tjr -- http://mail.python.org/mailman/listinfo/python-list
Re: Will multithreading make python less popular?
Hi again OpenERP and ERP5 was written in python as i know. I really wonder how they do this without threads. I want to see a real time graph at the same time while i am working on the same screen. What is the secret? Thanks Rushen -- http://mail.python.org/mailman/listinfo/python-list
Re: Regarding Joystick
Hi , I have figured out a code with the help of archives in pygame can anyone help me with controlling the speed of joystick ... i am going to integrate joystick with a PTZ camera ... i was wondering if there are any functions which can help me control the speed of camera and by controlling motion of joystick #! /usr/bin/env python import pygame from pygame import locals jlist = [] # global joystick list class Joystick: def __init__(self): pygame.init() self.nbJoy = pygame.joystick.get_count() for n in range(self.nbJoy): pygame.joystick.Joystick(n).init() try: for n in range(pygame.joystick.get_count()): # stick = pygame.joystick.Joystick(n) jlist.append(stick) # create a joystick instance stick.init() # init instance # report joystick charateristics # print '-'*20 print 'Enabled joystick: ' + stick.get_name() print 'it has the following devices :' print '-- buttons : '+ str(stick.get_numbuttons()) print '-- balls : '+ str(stick.get_numballs()) print '-- axes : '+ str(stick.get_numaxes()) print '-- hats : '+ str(stick.get_numhats()) print '-'*20 except pygame.error: print 'pygame.error, no joystick found.' def main(self): #init() # init pygame and joystick system while 1: # endless loop for e in pygame.event.get(): # iterate over event stack if e.type == pygame.locals.JOYAXISMOTION: # 7 for j in jlist: for n in range(j.get_numaxes()): print 'moved axe num '+str(n)+' : ' + str(j.get_axis(n)) print '-'*10 # separation elif e.type == pygame.locals.JOYBALLMOTION: # 8 for j in jlist: for n in range(j.get_numballs()): print 'moved ball num '+str(n)+' : '+ str(j.get_ball(n)) print '-'*10 # separation elif e.type == pygame.locals.JOYHATMOTION: # 9 for j in jlist: for n in range(j.get_numhats()): print 'moved hat num '+str(n)+' : '+ str(j.get_hat(n)) print '-'*10 # separation elif e.type == pygame.locals.JOYBUTTONDOWN: # 10 for j in jlist: for n in range(j.get_numbuttons()): if j.get_button(n) : # if this is down print 'down button num '+str(n)+' : '+ str(j.get_button(n)) print '-'*10 # separation elif e.type == pygame.locals.JOYBUTTONUP: # 11 for j in jlist: for n in range(j.get_numbuttons()): print 'up button num '+str(n)+' : '+ str(j.get_button(n)) print '-'*10 # separation if __name__ == '__main__': j = Joystick() j.main() thanks shreyas On Thu, Feb 12, 2009 at 11:36 PM, Banibrata Dutta banibrata.du...@gmail.com wrote: AFAIK, the mechanism / API / protocol to actuate the Camera's tilt, pan, zoom functions are not standardized (happy to be corrected there!), so even if you find something, it'd most likely be something very specific to a particular device. As for Joystick usage, I remember seeing one thread on that couple of months back, so searching thru the archive should give you leads. On Fri, Feb 13, 2009 at 3:33 AM, shreyas shah shreya...@gmail.com wrote: Hi , I am trying to control the motion of the camera with help of joystick , i need some basic functionality where if i move a joystick to left the camera moves to the left . Can anyone help me with that ? Thanks Shreyas -- http://mail.python.org/mailman/listinfo/python-list -- regards, Banibrata http://www.linkedin.com/in/bdutta -- http://mail.python.org/mailman/listinfo/python-list
Re: Speedup Bitmap Parser
Jayson Santos: Hello people, I'm writing a Bitmap parser for study purposes, This code: x = 0 y = 0 for line in bmp.bitmap_lines.lines: for color in xrange(len(line.colors)): canvas.create_line(x, y, x+1, y, fill=#%02x%02x%02x % (line.colors[color].red, line.colors[color].green, line.colors [color].blue)) x += 1 x = 0 y += 1 May be replaced with something like: for x, color in enumerate(line.colors): canvas.create_line(x, y, x+1, y, fill=#%02x%02x%02x % (color.red, color.green, color.blue)) And maybe a RGBTriple may be replaced with an immutable namedtuple. Using nested classes may be overkill for this program. Use the Python profiler and profile your code with a real image, and show us/me the profiler results, so I can give you some suggestions to speed up your code. Bye, bearophile -- http://mail.python.org/mailman/listinfo/python-list
Re: Found a very nice, small, cross-platform GUI toolkit for Python.
laplacia...@gmail.com laplacia...@gmail.com wrote: I think I just found the GUI toolkit for Python I've been searching for. It seems to meet all of the following requirements: * free software * small (I don't need batteries -- Python already comes with those.) * easy to use * actively maintained * cross-platform * easy to install * based on a stable and actively-maintained C library * does not depend on an external scripting language (for example, Tcl) * well-documented * not too many dependencies * can easily integrate with PyOpenGL * support for accessibility and it's also written in Python. I have no idea how it's stayed under the radar in the Python community for this long, yet here it is: [OcempGUI](http://ocemp.sourceforge.net/ gui.html). The C library it depends upon? [SDL](http:// www.libsdl.org/) (via [PyGame](http://www.pygame.org/news.html)). Interesting! One of the commercial apps I'm involved (C++ not python) in uses SDL as its GUI with windows etc built on top of it. It means that it looks exactly the same on all supported platforms and since it usually runs full screen that is fine. I imagine this GUI toolkit fits the same niche. Presumably since it uses SDL then all the GUI will appear in one window? So windows within windows in the MDI style? -- Nick Craig-Wood n...@craig-wood.com -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list
Re: Pythonic way to determine if a string is a number
pyt...@bdurham.com pyt...@bdurham.com wrote: Thanks for everyone's feedback. I believe my original post's code (updated following my signature) was in line with this list's feedback. Christian: Thanks for reminding me about exponential formats. My updated code accounts for these type of numbers. I don't need to handle inf or nan values. My original code's except catches an explicit ValueError exception per your concern about bare excepts. Malcolm code # str_to_num.py def isnumber( input ): try: num = float( input ) return True except ValueError: return False That is a fine solution. Last time I had to solve this I had a specific format of number to parse - I didn't want to include all the python formats. This is what I came up with... This particular code returns the converted number or 0.0 - adjust as you see fit! import re _float_pattern = re.compile(r^\s*([-+]?(\d*\.)?\d+([eE][-+]?\d+)?)) def atof(value): Convert a string to an float in the same way the c-library atof() does. Ie only converting as much as it can and returning 0.0 for an error. match = _float_pattern.search(value) if match: return float(match.group(1)) return 0.0 atof(15.5 Sausages) 15.5 atof( 17.2) 17.199 atof(0x12) 0.0 atof(8.3.2) 8.3007 atof(potato) 0.0 -- Nick Craig-Wood n...@craig-wood.com -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list
Re: flexible find and replace ?
how would you do a clever find and replace, where the value replacing
the tag
is changing on each occurence ?
...TAGTAGTAG..TAG.
is replaced by this :
...REPL01REPL02REPL03..REPL04...
This is a variant of the class I've used in the past for stateful
replacements:
import re
class Counter(object):
def __init__(self, prefix=REPL, start=1):
self.prefix = prefix
self.counter = start - 1
def __call__(self, matchobj):
self.counter += 1
return %s%02i % (self.prefix, self.counter)
r = re.compile(TAG) # the regexp to find what we want
s = some TAG stuff with TAG whatever more TAG stuff
print s
# just use the counter
print r.sub(Counter(), s)
# demo a different starting number
print r.sub(Counter(start=42), s)
# maintain a single counter across calls
c = Counter(prefix=Hello, start=42)
print r.sub(c, s)
print r.sub(c, s)
A better and clever method than this snippet should exist I hope :
counter = 1
while 'TAG' in mystring:
mystring=mystring.replace('TAG', 'REPL'+str(counter), 1)
counter+=1
...
(the find is always re-starting at the string beginning, this is not
efficient.
This also has problems if your search-string is a substring of
your replacement string:
search = foo
replacement = foobar#
You'll get
s = foo_foo
s = foobar01_foo
s = foobar02bar01_foo
...
which isn't quite what it looks like you want.
-tkc
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Re: Found a very nice, small, cross-platform GUI toolkit for Python.
On Feb 16, 4:31 pm, Nick Craig-Wood n...@craig-wood.com wrote: Interesting! One of the commercial apps I'm involved (C++ not python) in uses SDL as its GUI with windows etc built on top of it. It means that it looks exactly the same on all supported platforms and since it usually runs full screen that is fine. I imagine this GUI toolkit fits the same niche. Presumably since it uses SDL then all the GUI will appear in one window? So windows within windows in the MDI style? -- Nick Craig-Wood n...@craig-wood.com --http://www.craig-wood.com/nick There is a `window.py` example that comes with the distribution. It has modal and non-modal windows within the main window. I haven't yet seen any examples where OcempGUI runs full-screen. The relevant portion of the manual re. subwindows is: http://ocemp.sourceforge.net/manual/windows_and_dialogs.html -- http://mail.python.org/mailman/listinfo/python-list
