ANN: Celery 1.0 released
=== Celery 1.0 has been released! === We're happy to announce the release of Celery 1.0. What is it? === Celery is a task queue/job queue based on distributed message passing. It is focused on real-time operation, but supports scheduling as well. The execution units, called tasks, are executed concurrently on one or more worker servers. Tasks can execute asynchronously (in the background) or synchronously (wait until ready). Celery is already used in production to process millions of tasks a day. Celery was originally created for use with Django, but is now usable from any Python project. It can also operate with other languages via webhooks. The recommended message broker is RabbitMQ (http://rabbitmq.org), but support for Redis and databases is also available. For more information please visit http://celeryproject.org Features See http://ask.github.com/celery/getting-started/introduction.html#features Stable API == From this version on the public API is considered stable. This means there won't be any backwards incompatible changes in new minor versions. Changes to the API will be deprecated; so, for example, if we decided to remove a function that existed in Celery 1.0: * Celery 1.2 will contain a backwards-compatible replica of the function which will raise a PendingDeprecationWarning. This warning is silent by default; you need to explicitly turn on display of these warnings. * Celery 1.4 will contain the backwards-compatible replica, but the warning will be promoted to a full-fledged DeprecationWarning. This warning is loud by default, and will likely be quite annoying. * Celery 1.6 will remove the feature outright. See the Celery Deprecation Timeline for a list of pending removals: http://ask.github.com/celery/internals/deprecation.html What's new? === * Task decorators Write tasks as regular functions and decorate them. There are both task(), and periodic_task() decorators. * Tasks are automatically registered Registering the tasks manually was getting tedious, so now you don't have to anymore. You can still do it manually if you need to, just disable Task.autoregister. The concept of abstract task classes has also been introduced, this is like django models, where only the subclasses of an abstract task is registered. * Events If enabled, the worker will send events, telling you what tasks it executes, their results, and how long it took to execute them. It also sends out heartbeats, so listeners are able to detect nonfunctional workers. This is the basis for the new real-time web monitor we're working on (celerymon: http://github.com/ask/celerymon/). * Rate limiting Global and per task rate limits. 10 tasks a second? or one an hour? You decide. It's using the token bucket algorithm, which is commonly used for network traffic shaping. It accounts for bursts of activity, so your workers won't be bored by having nothing to do. * New periodic task service. Periodic tasks are no longer dispatched by celeryd, but instead by a separate service called *celerybeat*. This is an optimized, centralized service dedicated to your periodic tasks, which means you don't have to worry about deadlocks or race conditions any more. But that does mean you have to make sure only one instance of this service is running at any one time. **TIP:** If you're only running a single celeryd server, you can embed celerybeat inside it. Just add the --beat argument. * Broadcast commands If you change your mind and don't want to run a task after all, you now have the option to revoke it. Also, you can rate limit tasks or even shut down the worker remotely. It doesn't have many commands yet, but we're waiting for broadcast commands to reach its full potential, so please share your ideas if you have any. * Multiple queues The worker is able to receive tasks on multiple queues at once. This opens up a lot of new possibilities when combined with the impressive routing support in AMQP. * Platform agnostic message format. The message format has been standardized and is now using the ISO-8601 format for dates instead of Python datetime objects. This means you can write task consumers in other languages than Python (eceleryd anyone?) * Timely Periodic tasks are now scheduled on the clock, i.e. timedelta(hours=1) means every hour at :00 minutes, not every hour from the server starts. To revert to the previous behavior you have the option to enable PeriodicTask.relative. * ... and a lot more! To read about these and other changes in detail, please refer to the change log: http://celeryproject.org/docs/changelog.html This document contains crucial information for those upgrading from a previous version of Celery, so be sure to read the entire change set
[ANN] pyxser-1.4.2r --- Python Object to XML serializer/deserializer
-BEGIN PGP SIGNED MESSAGE- Hash: SHA512 Hello Python Community. I'm pleased to announce pyxser-1.4.2r, a python extension which contains functions to serialize and deserialize Python Objects into XML. It is a model based serializer. Here is the ChangeLog entry for this release: - ---8--- 1.4.2r (2010.02.10): Daniel Molina Wegener dmw at coder dot cl * pyxser_collections.c: Added constraint checks for NULL pointers removing nested statements. * pyxser.c: Removed nested statements. * pyxser_tools.c: Added constratints checks for NULL pointers, removed nested statements and added strict checking for lists since it was crashing with an ambigous list definition that can not be handled by PyList_Check(). * test-utf8.py: Added tests to determine if it continue crashing with module serialization. Thanks to pyxser users for their feedback. - ---8--- This release contains some bug fixes, mainly related to type checking and type handling. I hope this small extension will help you on your programming tasks. The project is hosted at: http://sourceforge.net/projects/pyxser/ The web page for the project is located at: http://coder.cl/products/pyxser/ PyPi entry is: http://pypi.python.org/pypi?:action=displayname=pyxserversion=1.4.2r For a sample article on how to integrate pyxser with ZSI WebServices: http://coder.cl/2009/10/18/pyxser-and-zsi-webservices/ Thanks and best regards, - -- Daniel Molina Wegener dmw [at] coder [dot] cl Software Architect, System Programmer Web Developer Phone: +1 (510) 629-4267 | Blog: http://coder.cl/ -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (GNU/Linux) iQIcBAEBCgAGBQJLcwqwAAoJEHxqfq6Y4O5NP2YQAKwiMq7xdutSpEcrXPsD2dxI VQUhzoaJ+Z+N0Vu6nKLM8yOXGkCSD8iuKgV3ZimH3gHhYs/VTvfkNwkfJuck76Vg y3CvJ69rVezYI2ELcsWP0+srxffyy0NHgYEKlKU3Dz06PhNnGx2PMfeG7j5ZGKyz 92J+PMoO6FSlRAmEmGrnjtWaCeNLmlJ2rdSvQ7iSIV8mTwULHB2QubvNs62x+8v5 Mj8XM4HVVEqOI2aF3KuAhYdHj6Exz3O5clnzT6niYl/ukWErSZ6JUJoF9IKcBPVJ LYMCIPvad6llr2FcIatve7MwdmFx/FVNkpd7oZuvLEiQYqxsuT9fv2L/1Ne1IRSM KRLW5/oqekirIURJgFmn6rw0D9Hj5eQXfXTTCHT+RTUaWgMKXFiVkSCHpOeX5M14 i4pp1+xUhje/R+Y05FmdcBivahdc+4UiaQsWODIj/kUbfa455aLrVomdLzXQavg/ 9nY/N5sd0wqdW2vyJrgvap1lAhzP+ktFk/UTetUavvz9bz0tHRB9aTNDS53dfck5 yVX/ZumRdtf4wtwTu/t6gkWD7N0K0Bmy1EB3JNz6KCBvjL8QDB8W/kW+os85QFoz 9NxedRoJNn5nVyos879+ClnHqXVTtkmeJOuLFuh2+9pnfc/KSAvCDXZKPZZNHKYx WdTJKm400Hi9J/pIOzx/ =bv4P -END PGP SIGNATURE- -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
Announcing IronPython 2.6.1 RC1
Hello Python Community, We're pleased to announce the release of IronPython 2.6.1 RC1. This version of IronPython makes great strides in stability and compatibility, including a considerable number of targeted bugfixes. Because this is our largest servicing release to date, and due to our decision against incrementing the assembly version numbers, it is important that we get everything right. To this end, we present our first-ever RC for a minor dot release. Of course, your feedback is imperative to the quality of this release, so we'd love to hear from you! IronPython 2.6.1 comes in two flavors - one that runs on top of .NET 4.0 RC, and one that runs on any other framework starting with .NET 2.0 SP1. They can be downloaded here: - IronPython 2.6.1 RC1 for .NET 2.0 SP1: http://ironpython.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=40144 - IronPython 2.6.1 RC1 for .NET 4.0 RC: http://ironpython.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=40146 Note: The .NET Framework 4.0 RC is required for the latter release and can be downloaded at http://www.microsoft.com/downloads/details.aspx?FamilyID=a9ef9a95-58d2-4e51-a4b7-bea3cc6962cbdisplaylang=en IronPython 2.6.1 RC1 includes fixes for well over 50 bugs, large and small. Ctypes has had a number of significant updates, including union support, variant_bool, and wintypes. Another focus has been on sys.settrace, making debugging more reliable. For example, sys.settrace now returns the correct frame, supports tracing through modules, and no longer interferes with import os. Other notable fixes include thread-safe importing, and the missing error code in _winreg exception. In addition, we've made a substantial improvement in import time. Not only does this reduce startup time, but can speed up the importing of large, definition-heavy modules by up to 50%. As you might imagine, the .NET 4.0 flavor of IronPython 2.6.1 RC1 has a few of its own changes designed for better interoperability with the framework. These include fixing some errors with Func and better runtime isolation when similarly-named assemblies in different locations are loaded in multiple engines. In addition, both the .NET 2.0 and .NET 4.0 builds support the new .NET 4.0 IStructuralEquatable and IStructuralComparable interfaces and maps them to the appropriate operations (__eq__, __hash__, __gt__, etc.). In the case of .NET 4.0, this replaces IValueEquality as the gold standard for defining equality in an interop-friendly manner. In the .NET 2.0 build, these interfaces are copied so that their use can be phased in while retaining IValueEquality for backwards compatibility. Special thanks to Albert Szilvasy, cendalc, clovery, egonw_, essey, fabiofz, igalse, jazzcat, jlunder, laughingboy, marten_range, László de Almásy, lbaker, Lukas Cenovsky, pl6306, roinet, sanxiyn, Thomas Heller, vernondcole, and Wolfram for reporting issues. Happy Scripting! - The IronPython Team -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
Announce: Linux Desktop Testing Project (LDTP) 2.0.3 released
Hello, About LDTP: Linux Desktop Testing Project is aimed at producing high quality test automation framework (using GNOME / Python) and cutting-edge tools that can be used to test Linux Desktop and improve it. It uses the Accessibility libraries to poke through the application's user interface. We strive to help in building a quality desktop. Changes in this release: Return always unicode string in gettextvalue, required to fix automated test script in VMware Workstation Fix ooldtp compatibility with LDTPv1 as reported by Mago [1] team Patch by James Tatum for getallstates compatible with hasstate function Fix bug b.g.o#608413 Fix Firefox preference accessing bug, reported by Aaron Yuan yuanchong1...@gmail.com Download source: http://download.freedesktop.org/ldtp/2.x/2.0.x/ldtp-2.0.3.tar.gz Download RPM from http://download.opensuse.org/repositories/home:/anagappan:/ldtp2:/rpm/ Will schedule deb build in openSUSE build service tomorrow Documentation references: For detailed information on LDTP framework and latest updates visit http://ldtp.freedesktop.org For information on various APIs in LDTP including those added for this release can be got from http://ldtp.freedesktop.org/user-doc/index.html Report bugs - http://ldtp.freedesktop.org/wiki/Bugs To subscribe to LDTP mailing lists, visit http://ldtp.freedesktop.org/wiki/Mailing_20list IRC Channel - #ldtp on irc.freenode.net Thanks Nagappan [1] - http://mago.ubuntu.com -- Linux Desktop (GUI Application) Testing Project - http://ldtp.freedesktop.org http://nagappanal.blogspot.com -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
Re: Modifying Class Object
* I V: On Thu, 11 Feb 2010 07:37:35 +0100, Alf P. Steinbach wrote: * Steven D'Aprano: s = [1] t = s # Binds the name t to the object bound to the name s. t[0] = 2 # Changes the object bound to the name t print(s) # Checks the object via the original name. Notice that your version describes what happens according to some implementation, below the level of the Python virtual machine. Consider just the assert( t is not s ) t = s Does this change anything at all in the computer's memory? If it doesn't, then it has no effect whatsoever. But since it does have an effect, a memory change has been effected. I don't think your disagreeing with Steven here - by talking about the computers memory, it's clear that you are talking about the details of an implementation of python, not the semantics of python itself. Unless, of course, you are under the misapprehension that the computer's memory is relevant to the python language, rather than the particular implementation. Python itself has nothing to do with computers or memory; these are mere implementation details. You know, the programming language that doesn't need computers: Python. :-) Cheers, - Alf (not sure how to read your posting, but it's funny anyhow) -- http://mail.python.org/mailman/listinfo/python-list
Re: I've built Python, but can't figure out how to package it for windows
On 11/02/2010 05:24, Mark Jones wrote: [... problems building from tools/msi ...] I sympathise. I went through similar hoops last year, merely to be able to do it. I think I'm right in saying that very few people are bothered enough to package their own MSI on windows because the (probably very few) developers who have a need to run bleeding-edge Python, eg to test out patches or whatever, can simply run from checkout\pcbuild\python_d.exe or whatever. And everyone else simply runs the MSI provided on python.org. I'm fairly sure I'm right in saying that it's Martin von L who builds the MSIs for python.org and if I haven't done it before I'd like to offer him a vote of thanks for having done and for continuing to do this. The tools/msi is used by him to do those builds and does make certain assumptions. One, in particular, is that you have an *existing* copy of some recent Python running somewhere. (I use python25, I think). Altho' it might be nice to be able to bootstrap, in practice it isn't a problem. For interest's sake I offer my make-snapshots area which I use to build trunk or branches for Python 2.x / 3.x when I have the change: http://svn.tjg.org.uk/make-snapshots Feel free to look at least to see what I'm doing. I think I didn't bother with Tix (I don't use Tkinter) so thanks for providing some input on that; I may well go back and retrofit. TJG -- http://mail.python.org/mailman/listinfo/python-list
Re: Executing Commands From Windows Service
On 10/02/2010 22:55, T wrote: Great suggestions once again - I did verify that it was at least running the plink.exe binary when under LocalSystem by having the service run plink.exe C:\plinkoutput.txt - this worked fine. And, as I mentioned, it's now working just fine when running under a regular admin account. So, I think that's going to be my solution to avoid any further issues. My best guess at this point (as you mentioned), is that plink.exe is doing _something_ network-related that LocalSystem doesn't have the privileges to do - what exactly it is, I have no idea. I may play around with it some more later, but running the service under an admin account should be a perfectly acceptable solution. Also, I will be writing other Python apps that the service will be executing - so it goes without saying that I'll be including a log to file option :) Thanks again for all your guys' help! I'm not sure if this has been said already, but a reasonably common approach to services is to create a user specifically for the service and grant it exactly the privs / perms it needs (once you work out what they are). You then assign it a generated password, eg a GUID which you don't even try to remember: simply cut-and-paste it in. Then create the service to run under that user. That way you don't have the service running under some local Administrator account with the associated risk of its being subverted and gaining more control than you want. Nor do you have it running as a real user whose password might change for any reason, leaving you with a service which won't start up. I don't remember at this moment whether such a user's profile is automatically loaded in the process when the service starts or whether you have to do the LoadUserProfile thing. TJG -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: obfuscate
Gregory Ewing wrote: Actually I gather it had a lot to do with the fact that the Germans made some blunders in the way they used the Enigma that seriously compromised its security. There was reportedly a branch of the German forces that used their Enigmas differently, avoiding those mistakes, and the British never managed to crack any of their messages. IIRC some versions of the Enigma weren't cracked because they used a different setup and different daily keys. The predecessor of the Enigma was cracked by Polish scientists years before WW2 started. Some flaws in the instructions and a known plain text attack made the crack of the Enigma practical. It took the British scientists merely hours rather than days or weeks to decipher the daily key with some smart tricks. For example they started fake attacks on ships or cities just to have the names in some encrypted reports. -- http://mail.python.org/mailman/listinfo/python-list
how to improve this cycle (extracting data from structured array)?
Hello guys, I am just wondering if there is a quick way to improve this algorithm [N is a structured array which hold info about the nodes n of a finite element mesh, and n is about 300.000). I need to extract info from N and put it in to a 3*n matrix NN which I reshape then with numpy. I think to append is quite unefficient: *** N = odb.rootAssembly.instances['PART-1-1'].nodes NN=[] B=[0,0,0] #auxsiliar vector for i in range(len(N)): B[0] = N[i].label B[1] = N[i].coordinates[0] B[2] = N[i].coordinates[1] NN = append(NN,B) NN=NN.reshape(-1,3) Many Thanks in advance! Alex -- http://mail.python.org/mailman/listinfo/python-list
Re: how to improve this cycle (extracting data from structured array)?
Alexzive wrote: I am just wondering if there is a quick way to improve this algorithm [N is a structured array which hold info about the nodes n of a finite element mesh, and n is about 300.000). I need to extract info from N and put it in to a 3*n matrix NN which I reshape then with numpy. I think to append is quite unefficient: *** N = odb.rootAssembly.instances['PART-1-1'].nodes NN=[] B=[0,0,0] #auxsiliar vector for i in range(len(N)): B[0] = N[i].label B[1] = N[i].coordinates[0] B[2] = N[i].coordinates[1] NN = append(NN,B) Usually this would be written with a list-comprehension, something like nn = [(x.label, x.coordinates[0], x.coordinates[1]) for x in N] or if you really need lists-of-lists instead of lists-of-tuples: nn = [[x.label, x.coordinates[0], x.coordinates[1]] for x in N] -tkc -- http://mail.python.org/mailman/listinfo/python-list
Bizarre arithmetic results
Can someone explain to me what python is doing here? Python 3.1.1 (r311:74480, Feb 3 2010, 13:36:47) [GCC 4.3.4] on linux2 Type help, copyright, credits or license for more information. -0.1 ** 0.1 -0.7943282347242815 a = -0.1; b = 0.1 a ** b (0.7554510437117542+0.2454609236416552j) -abs(a ** b) -0.7943282347242815 Why does the literal version return the signed magnitude and the variable version return a complex? Cheers, Terrence -- http://mail.python.org/mailman/listinfo/python-list
Re: Re: sqlite3 bug?
Thank you It just highlights that when your tired things can easily be missed and maybe you should leave things until the morning to view things with fresh eyes =) -- http://mail.python.org/mailman/listinfo/python-list
Re: Modifying Class Object
Alf P. Steinbach al...@start.no writes: [...] That's bullshit. [...] not any that you know about. [...] yet another ad hominem attack [...] It also reflects rather badly on you. [...] - Alf Alf, The above was extracted from the last post from you but I could have picked almost any of your recent endeavours. I've come to the conclusion that you're not a cute furry alien with a long nose. You're a big bad troll! -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: obfuscate
Daniel Fetchinson wrote: It also turned out that everybody mostly writes his/her own obfuscation routine. Hey, it gives you the additional advantage of obfuscation by obscurity! -- Greg -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: obfuscate
Gregory Ewing greg.ew...@canterbury.ac.nz writes: Actually I gather it had a lot to do with the fact that the Germans made some blunders in the way they used the Enigma that seriously compromised its security. There was reportedly a branch of the German forces that used their Enigmas differently, avoiding those mistakes, and the British never managed to crack any of their messages. I think you are thinking of the Kriegsmarine (naval) Enigma. Yes they were more careful with procedures, but the machine was also harder to crack because it had four rotors instead of three. IIRC, the Brits were eventually (1942?) able to capture one by shooting up a German submarine and boarding it to get the machine while the sub was sinking; a British sailor wasn't able to get out in time and drowned during that operation. Getting the rotor settings off the captured unit (they may have had to do it more than once) was enough to get a foothold into the code. My memory is hazy on this by now so I may have some parts wrong, but David Kahn's book Seizing the Enigma tells the story (I read it many years ago). A fictionalized version appears in Neil Stephenson's novel Cryptonomicon. -- http://mail.python.org/mailman/listinfo/python-list
Unicode strings
Excellent! But what about the unicode -- http://mail.python.org/mailman/listinfo/python-list
Re: Bizarre arithmetic results
On Thu, Feb 11, 2010 at 1:44 AM, Terrence Cole list-s...@trainedmonkeystudios.org wrote: Can someone explain to me what python is doing here? Python 3.1.1 (r311:74480, Feb 3 2010, 13:36:47) [GCC 4.3.4] on linux2 Type help, copyright, credits or license for more information. -0.1 ** 0.1 -0.7943282347242815 a = -0.1; b = 0.1 a ** b (0.7554510437117542+0.2454609236416552j) -abs(a ** b) -0.7943282347242815 Why does the literal version return the signed magnitude and the variable version return a complex? It's an issue of precedence of operators: -0.1 ** 0.1 is interpreted as -(0.1 ** 0.1) and not as (-0.1) ** 0.1 -- André Engels, andreeng...@gmail.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Bizarre arithmetic results
On Feb 11, 12:44 am, Terrence Cole list- s...@trainedmonkeystudios.org wrote: Can someone explain to me what python is doing here? -0.1 ** 0.1 -0.7943282347242815 Here you're computing -(0.1 ** 0.1). The exponentiation operator binds more strongly than the negation operator. a = -0.1; b = 0.1 a ** b (0.7554510437117542+0.2454609236416552j) Here you're computing (-0.1) ** 0.1. -- Mark -- http://mail.python.org/mailman/listinfo/python-list
Re: Bizarre arithmetic results
Terrence Cole wrote: Can someone explain to me what python is doing here? Python 3.1.1 (r311:74480, Feb 3 2010, 13:36:47) [GCC 4.3.4] on linux2 Type help, copyright, credits or license for more information. -0.1 ** 0.1 -0.7943282347242815 a = -0.1; b = 0.1 a ** b (0.7554510437117542+0.2454609236416552j) -abs(a ** b) -0.7943282347242815 Why does the literal version return the signed magnitude and the variable version return a complex? Operator precedence. -0.1**0.1 -0.7943282347242815 (-0.1)**0.1 (0.7554510437117542+0.2454609236416552j) Quoting http://docs.python.org/3.1/reference/expressions.html: The power operator binds more tightly than unary operators on its left; it binds less tightly than unary operators on its right. Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: Bizarre arithmetic results
Do you really believe that -0.1 ** 0.1 is a valid computational problem ? Can you raise a negative number to a fractional power ? Output on my console (python 2.6) -.1 ** .1 -0.79432823472428149 a,b = -.1,.1 a**b Traceback (most recent call last): File stdin, line 1, in module ValueError: negative number cannot be raised to a fractional power -abs(a**b) Traceback (most recent call last): File stdin, line 1, in module ValueError: negative number cannot be raised to a fractional power There is a little issue here that ' -.1 ** .1' should give you error message. That is it. On Thu, Feb 11, 2010 at 6:14 AM, Terrence Cole list-s...@trainedmonkeystudios.org wrote: Can someone explain to me what python is doing here? Python 3.1.1 (r311:74480, Feb 3 2010, 13:36:47) [GCC 4.3.4] on linux2 Type help, copyright, credits or license for more information. -0.1 ** 0.1 -0.7943282347242815 a = -0.1; b = 0.1 a ** b (0.7554510437117542+0.2454609236416552j) -abs(a ** b) -0.7943282347242815 Why does the literal version return the signed magnitude and the variable version return a complex? Cheers, Terrence -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Bizarre arithmetic results
Terrence Cole wrote: -0.1 ** 0.1 -0.7943282347242815 a = -0.1; b = 0.1 a ** b (0.7554510437117542+0.2454609236416552j) -abs(a ** b) -0.7943282347242815 Why does the literal version return the signed magnitude and the variable version return a complex? The binary power operator has a higher precedence than the unary negative operator. -0.1 ** 0.1 is equal to -(0.1**0.1) Christian -- http://mail.python.org/mailman/listinfo/python-list
Re: Bizarre arithmetic results
Just realized my flaw .1**.1 0.79432823472428149 (-.1)**(.1) Traceback (most recent call last): File stdin, line 1, in module ValueError: negative number cannot be raised to a fractional power - a ** b = - (a ** b) and not (-a) ** b, Thats why -.1**.1 giving you -0.79432823472428149 since .1 ** .1 = 0.79432823472428149 and minus sign is appended prior to it. On Thu, Feb 11, 2010 at 6:01 PM, Shashwat Anand anand.shash...@gmail.comwrote: Do you really believe that -0.1 ** 0.1 is a valid computational problem ? Can you raise a negative number to a fractional power ? Output on my console (python 2.6) -.1 ** .1 -0.79432823472428149 a,b = -.1,.1 a**b Traceback (most recent call last): File stdin, line 1, in module ValueError: negative number cannot be raised to a fractional power -abs(a**b) Traceback (most recent call last): File stdin, line 1, in module ValueError: negative number cannot be raised to a fractional power There is a little issue here that ' -.1 ** .1' should give you error message. That is it. On Thu, Feb 11, 2010 at 6:14 AM, Terrence Cole list-s...@trainedmonkeystudios.org wrote: Can someone explain to me what python is doing here? Python 3.1.1 (r311:74480, Feb 3 2010, 13:36:47) [GCC 4.3.4] on linux2 Type help, copyright, credits or license for more information. -0.1 ** 0.1 -0.7943282347242815 a = -0.1; b = 0.1 a ** b (0.7554510437117542+0.2454609236416552j) -abs(a ** b) -0.7943282347242815 Why does the literal version return the signed magnitude and the variable version return a complex? Cheers, Terrence -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Bizarre arithmetic results
Terrence Cole writes: Can someone explain to me what python is doing here? Python 3.1.1 (r311:74480, Feb 3 2010, 13:36:47) [GCC 4.3.4] on linux2 Type help, copyright, credits or license for more information. -0.1 ** 0.1 -0.7943282347242815 a = -0.1; b = 0.1 a ** b (0.7554510437117542+0.2454609236416552j) -abs(a ** b) -0.7943282347242815 Why does the literal version return the signed magnitude and the variable version return a complex? The minus sign is not part of the literal syntax. Python takes the expression as -(0.1 ** 0.1), the binary operator binding tighter than the unary. Try (-0.1) ** 0.1, and try a = 0.1, then -a ** 0.1. -- http://mail.python.org/mailman/listinfo/python-list
Re: Bizarre arithmetic results
Terrence Cole wrote: Can someone explain to me what python is doing here? Python 3.1.1 (r311:74480, Feb 3 2010, 13:36:47) [GCC 4.3.4] on linux2 Type help, copyright, credits or license for more information. -0.1 ** 0.1 -0.7943282347242815 a = -0.1; b = 0.1 a ** b (0.7554510437117542+0.2454609236416552j) -abs(a ** b) -0.7943282347242815 Why does the literal version return the signed magnitude and the variable version return a complex? I think this recently showed up on the list and the answer involved the order of operations and precedence of - vs. **. To check, try (-0.1) ** 0.1 -(0.1 ** 0.1) The first one is what the assignment-to-variables gains you, but I think ** has a higher precedence than the unary-- so it gets performed first. I don't have Py3 on my machine here, and 2.5 rejects the first form: Python 2.5.4 (r254:67916, Nov 19 2009, 19:46:21) [GCC 4.3.4] on linux2 Type help, copyright, credits or license for more information. -(0.1**0.1) -0.79432823472428149 (-0.1)**0.1 Traceback (most recent call last): File stdin, line 1, in module ValueError: negative number cannot be raised to a fractional power But perhaps Py3 changes evaluation, returning an complex number. -tkc -- http://mail.python.org/mailman/listinfo/python-list
Re: Bizarre arithmetic results
On 2/11/10, Terrence Cole list-s...@trainedmonkeystudios.org wrote: Can someone explain to me what python is doing here? Python 3.1.1 (r311:74480, Feb 3 2010, 13:36:47) [GCC 4.3.4] on linux2 Type help, copyright, credits or license for more information. -0.1 ** 0.1 -0.7943282347242815 a = -0.1; b = 0.1 a ** b (0.7554510437117542+0.2454609236416552j) -abs(a ** b) -0.7943282347242815 Why does the literal version return the signed magnitude and the variable version return a complex? Try this and think about operator precedence: Python 3.1.1 (r311:74480, Dec 13 2009, 16:50:25) [GCC 4.4.2 20091027 (Red Hat 4.4.2-7)] on linux2 Type help, copyright, credits or license for more information. (-0.1)**0.1 (0.7554510437117542+0.2454609236416552j) I.e. -0.1**0.1 is not the same as (-0.1)**0.1, because it's first 0.1**0.1 and then a minus sign. HTH, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Executing Commands From Windows Service
On 02/07/10 19:02, T wrote: I have a script, which runs as a Windows service under the LocalSystem account, that I wish to have execute some commands. Specifically, the program will call plink.exe to create a reverse SSH tunnel. Right now I'm using subprocess.Popen to do so. When I run it interactively via an admin account, all is well. However, when I'm running it via service, no luck. I'm assuming this is to do with the fact that it's trying to run under the LocalSystem account, which is failing. What would be the best way around this? Thanks! All being said about LS account not having the appropriate rights to access the necessary devices/files. Could it be so simple that the network is plain simply not available at all? For wireless connections I believe the connection/authentication by default is made in user space. I would save the output of an ipconfig run as the LS account to a file and see what is happening. Perhaps followed by a ping. -- mph -- http://mail.python.org/mailman/listinfo/python-list
Re: SimpleXMLRPCServer and client address
Stephen Hansen wrote: On Wed, Feb 10, 2010 at 5:36 PM, Jean-Michel Pichavant jeanmic...@sequans.com mailto:jeanmic...@sequans.com wrote: I don't know exactly what you are trying to do, but if your server requires informations from the client, it would be better to ask explicitly the client for those informations. For instance, if a method requires te client IP address, then the IP address is definitely a parameter of the method. I can't answer the OP, as I don't know the answer to his specific question-- but er, asking a client to provide one's IP address is not really a very workable solution. There's no way to really determine your own IP address in a reliable way. All the usual methods (e.g., socket.gethostbyname(socket.gethostname())) can fail and/or be wrong in some not terribly uncommon situations. The only reliable way to get such a piece of information is to connect to a server, and ask that server what address you were connecting to them as. Even then, that IP may not be the same as an IP you use to connect to say, a different server (on a different network) --S You're probably right. But my point covered only the fact that if a method needs something it should ask it explicitly throught parameters, not taking the opportunity to guess it since it happens that it's a xmlrpc server and that the information could be deduced from the client IP address. My feeling is that the OP needed something else than the client IP address, and was trying at the server side to map client IPs with the data he effectively needs. I could be wrong though. JM -- http://mail.python.org/mailman/listinfo/python-list
exception in Tkinter on Ubtunu...
...hey guys, I posted this over on the Ubuntu forums with no luck. I'm running Ubuntu 9.10 and python 2.5. In Idle when I type in a function I get this error... Exception in Tkinter callback Traceback (most recent call last): File /usr/lib/python2.5/lib-tk/Tkinter.py, line 1417, in __call__ return self.func(*args) File /usr/lib/python2.5/idlelib/MultiCall.py, line 151, in handler r = l[i](event) File /usr/lib/python2.5/idlelib/CallTips.py, line 55, in try_open_calltip_event self.open_calltip(False) File /usr/lib/python2.5/idlelib/CallTips.py, line 79, in open_calltip self.calltip.showtip(arg_text, sur_paren[0], sur_paren[1]) File /usr/lib/python2.5/idlelib/CallTipWindow.py, line 66, in showtip self.position_window() File /usr/lib/python2.5/idlelib/CallTipWindow.py, line 35, in position_window self.parencol)) File /usr/lib/python2.5/lib-tk/Tkinter.py, line 2860, in bbox self.tk.call((self._w, 'bbox') + args)) or None File /usr/lib/python2.5/lib-tk/Tkinter.py, line 1033, in _getints return tuple(map(getint, self.tk.splitlist(string))) ValueError: invalid literal for int() with base 10: '(167,' testNestEggFixed( ...I've tried reinstalling, and am not sure where to go from here. I also get a 2nd small windows about 2X2 with 'idle' in the title, and nothing in the box, and I cannot use the mouse if I open a Python program from Idle. Any ideas? -- http://mail.python.org/mailman/listinfo/python-list
Re: Your beloved python features
$ python -c import this -- http://mail.python.org/mailman/listinfo/python-list
Re: Bizarre arithmetic results
Tim Chase python.l...@tim.thechases.com wrote: But perhaps Py3 changes evaluation, returning an complex number. Yes, the change is documented at http://docs.python.org/3.1/reference/expressions.html#the-power-operator If it is in any of the What's new in Python x.xx documents or in a PEP somewhere I haven't spotted it. -- Duncan Booth http://kupuguy.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
base32hex support in python?
Hi, One of the modules that I am currently working on requires base32hex encoding as defined by RFC 4648, section 7. I checked base64 module which has base32encode/decode functionality but not with extended hex alphabet. Is there a module, currently available, that provides this? As far as I see, it looks fairly simple to add support for base32hex. It differs from the base32 encoding only in the alphabet used. I am willing to provide a patch. Just to note, map01 argument won't be applicable to base32hexdecode as this encoding uses both 0 (zero) and O (oh) in its alphabet. Looking at the section 13 of RFC 4648, I think, adding base32hex support would make it conform to RFC 4648. - Vishal DISCLAIMER == This e-mail may contain privileged and confidential information which is the property of Persistent Systems Ltd. It is intended only for the use of the individual or entity to which it is addressed. If you are not the intended recipient, you are not authorized to read, retain, copy, print, distribute or use this message. If you have received this communication in error, please notify the sender and delete all copies of this message. Persistent Systems Ltd. does not accept any liability for virus infected mails. -- http://mail.python.org/mailman/listinfo/python-list
Re: how to improve this cycle (extracting data from structured array)?
On Feb 11, 1:08 pm, Tim Chase python.l...@tim.thechases.com wrote: Alexzive wrote: I am just wondering if there is a quick way to improve this algorithm [N is a structured array which hold info about the nodes n of a finite element mesh, and n is about 300.000). I need to extract info from N and put it in to a 3*n matrix NN which I reshape then with numpy. I think to append is quite unefficient: *** N = odb.rootAssembly.instances['PART-1-1'].nodes NN=[] B=[0,0,0] #auxsiliar vector for i in range(len(N)): B[0] = N[i].label B[1] = N[i].coordinates[0] B[2] = N[i].coordinates[1] NN = append(NN,B) Usually this would be written with a list-comprehension, something like nn = [(x.label, x.coordinates[0], x.coordinates[1]) for x in N] or if you really need lists-of-lists instead of lists-of-tuples: nn = [[x.label, x.coordinates[0], x.coordinates[1]] for x in N] -tkc yeah, much better thanks! Alex -- http://mail.python.org/mailman/listinfo/python-list
Re: Bizarre arithmetic results
On Feb 11, 1:38 pm, Duncan Booth duncan.bo...@invalid.invalid wrote: Tim Chase python.l...@tim.thechases.com wrote: But perhaps Py3 changes evaluation, returning an complex number. Yes, the change is documented athttp://docs.python.org/3.1/reference/expressions.html#the-power-operator If it is in any of the What's new in Python x.xx documents or in a PEP somewhere I haven't spotted it. Not in the 'what's new' documents, as far as I can tell, but this change was introduced as part of implementing PEP 3141. http://www.python.org/dev/peps/pep-3141/ Here's an extract from the PEP, describing the 'Complex' abstract base class: class Complex(Number): Complex defines the operations that work on the builtin complex type. In short, those are: conversion to complex, bool(), .real, .imag, +, -, *, /, **, abs(), .conjugate(), ==, and !=. If it is given heterogenous arguments, and doesn't have special knowledge about them, it should fall back to the builtin complex type as described below. snip lots of other abstractmethods here @abstractmethod def __pow__(self, exponent): a**b; should promote to float or complex when necessary. raise NotImplementedError -- Mark -- http://mail.python.org/mailman/listinfo/python-list
python crash on windows but not on linux
To all, I am running an EDI translator, and doing stress tests. When processing a test with a (relatively) big EDI file(s) on windowsXP I get a crash: 'sorry for the inconvenience' etc (so no clues about what is causing the problem) This happens with python 2.4, 2.5, 2.6 It does not happen in the same setuptests on linux. (while the linux machine has only half of the RAM of the windows machine). I am quite sure it is not some external module; there's no GUI (apart from 'print'), no network connections. Actually, the crash is not predictablethe crash occurs most of the time...but at different points. So basically I am wondering how to proceed. Is it related to a memory problem? (which does not occur on Linux) any pointer is very welcome, henk-jan -- http://mail.python.org/mailman/listinfo/python-list
Re: method names nounVerb or verbNoun
On 05-Feb-10 14:53 PM, Wanderer wrote: Which is the more accepted way to compose method names nounVerb or verbNoun? For example voltageGet or getVoltage? getVoltage sounds more normal, but voltageGet is more like voltage.Get. I seem to mix them and I should probably pick one way and stick with it. Thanks I prefer verbNoun. Let's remember that PEP 8 is a guide, not a set of rules. Colin W. -- http://mail.python.org/mailman/listinfo/python-list
Re: Bizarre arithmetic results
On 2010-02-11 06:31 AM, Shashwat Anand wrote: Do you really believe that -0.1 ** 0.1 is a valid computational problem ? Can you raise a negative number to a fractional power ? Output on my console (python 2.6) -.1 ** .1 -0.79432823472428149 a,b = -.1,.1 a**b Traceback (most recent call last): File stdin, line 1, in module ValueError: negative number cannot be raised to a fractional power -abs(a**b) Traceback (most recent call last): File stdin, line 1, in module ValueError: negative number cannot be raised to a fractional power There is a little issue here that ' -.1 ** .1' should give you error message. That is it. No, fractional powers of negative numbers are perfectly valid mathematically. The result is a complex number. In Python 3 (what the OP is using), this has been implemented, but not in Python 2.6. -- 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: Modifying Class Object
Alf P. Steinbach wrote: * Steve Holden: [...] In this particular part of the thread I am attempting, unsuccessfully, to convince you that a change in *your* behavior would lead to less hostility directed towards the way you present your ideas. You apparently feel it is quite acceptable to tell people to learn to read, I have not used that expression. However I have suggest and emphasized that it might help to *read* whatever one quotes, when the quoted material (such as one paragraph) has not been read. Telling someone to learn to read is a Steve Holden'sk way to imply that the person is an ignoramus who hasn't bothered to learn to read. Telling a person to read something that's obviously not been read is quite another matter. So, you are misrepresenting -- again -- and in a quite revealing way, sorry. Pardon me? You used it on December 16 in a response to Mensanator in message hgbri8$e1...@news.eternal-september.org M : How about devoting a section on downloading the source files M : and compiling it on a Mac? AS: Learn to read. AS: At the top of every second page it tells you that this is an AS: introduction based on Windows. I am sure you will have some glib response as to why this wasn't rude at all. Allow me to correct you - it was, and rudeness is not welcomed on comp.lang.python. That doesn't mean it doesn't happen (why, I have even been known to be rude myself - we are none of us perfect, after all). I have already given ample evidence that when I am wrong I will admit it. You, contrariwise, maintain that you will admit when you are wrong (I believe 40% of the time was the figure you used) but I fail to remember any single incident when you made such an admission. and calling their assertions bullshit, Yes, in this group, but only for personal attacks. Such as yours. I think I've shown extreme restraint in the face of bullying from you and some followers, and calling the insinuations bullshit is quite mild. I don't have followers. Assertions I make are my own, and stand alone without the need of support. Calling them bullshit is indeed quite mild, but doesn't invalidate them. You can only do that by engaging, but instead you hysterically shout ad hominem whenever anyone makes a personal remark. but when we try to point out aspects of your behavior that are either undesirable or unacceptable we are indulging in ad hominem attacks. That is an untrue and extremely misleading description of what you've been doing. I'll let that be judged on the record. You have consistently refused to accept, despite assertions from several individuals (presumably those you choose to characterize as my followers, thereby allowing you to write them off without seriously considering what they say - at least that is how it looks from the outside) that criticism of your behavior is not, in fact, an ad hominem attack but an attempt to engage you in debate and have you modify that behavior. So, for the final time: remarks about personal characteristics only constitute ad hominem attacks ONLY when they are made for the purpose of invalidating other (typically, in this group, technical) arguments. If we met in person at a conference (God help us both) and you sat in an open space session picking your nose, would you deem it an ad hominem attack if I told you to stop? It sounds like it, even though I would tell you to stop not so that others would respect your technical arguments any less, but because by departing from the accepted standards of behavior you would offend others. In your terms, your accusing me of bullying behavior is an ad hominem attack on me, so I won't bother to respond further. You're complaining about the person you're hitting saying clearly what you did. If some truthful words about bullying can get you straight I'm for it. Even if it means getting down to your level (and yes, I did). Nope, I'm not complaining at all. That's your tactic: look, Steve is hitting me. You are entitled to write what you like on this newsgroup, but you have to accept that it will have consequences. I am simply pointing out that what's sauce for the goose is sauce for the gander. regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 PyCon is coming! Atlanta, Feb 2010 http://us.pycon.org/ Holden Web LLC http://www.holdenweb.com/ UPCOMING EVENTS:http://holdenweb.eventbrite.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Modifying Class Object
Alf P. Steinbach wrote: * Steven D'Aprano: [...] accusing them of lying for having an opinion that differs from yours, That is untrue. Well, that says it all really. regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 PyCon is coming! Atlanta, Feb 2010 http://us.pycon.org/ Holden Web LLC http://www.holdenweb.com/ UPCOMING EVENTS:http://holdenweb.eventbrite.com/ -- http://mail.python.org/mailman/listinfo/python-list
Any way to turn off exception handling? (debugging)
Hello everyone, I'm getting an exception (on socket) handled in a program I'm trying to debug. I have trouble locating where exactly that happens. In such situation turning exception handling off could be useful, bc unhandled exception stack trace is precisely what I'm trying to obtain. Anybody knows of such possibility? Regards, mk -- http://mail.python.org/mailman/listinfo/python-list
Re: method names nounVerb or verbNoun
On 02/05/10 19:53, Wanderer wrote: Which is the more accepted way to compose method names nounVerb or verbNoun? For example voltageGet or getVoltage? getVoltage sounds more normal, but voltageGet is more like voltage.Get. I seem to mix them and I should probably pick one way and stick with it. Thanks For me personally I do the following: spam_get/spam_set; might be preferred if you have more spam_* functions (i.e. spam_del, spam_eat, etc.) set_spam/get_spam; is I think reasonable if you have also a *_ham function (i.e. set_ham, get_ham). Funny thing for me is that when I have both spam_* *_ham naming, I usually rethink my approach and split it out to separate classes/modules. Please note that this is at the moment a personal, uneducated, never really thought about it, preference. Meaning it is very likely that with some more insight there is a good chance that I find my approach in retrospect flawed. -- mph -- http://mail.python.org/mailman/listinfo/python-list
Re: Bizarre arithmetic results
Robert Kern writes: On 2010-02-11 06:31 AM, Shashwat Anand wrote: There is a little issue here that ' -.1 ** .1' should give you error message. That is it. No, fractional powers of negative numbers are perfectly valid mathematically. The result is a complex number. In Python 3 (what the OP is using), this has been implemented, but not in Python 2.6. Perhaps it should raise a MisleadingSpacingError at compile time. The error message could recommend - .1**.1, or better -(.1 ** .1). -- http://mail.python.org/mailman/listinfo/python-list
Re: Any way to turn off exception handling? (debugging)
mk wrote: Hello everyone, I'm getting an exception (on socket) handled in a program I'm trying to debug. I have trouble locating where exactly that happens. In such situation turning exception handling off could be useful, bc unhandled exception stack trace is precisely what I'm trying to obtain. Anybody knows of such possibility? Regards, mk If the exception is currently being trapped by a handler in your code you could just insert a raise statement at the start of that handler. This will re-raise the same exception, which will presumably not be caught a second time? regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 PyCon is coming! Atlanta, Feb 2010 http://us.pycon.org/ Holden Web LLC http://www.holdenweb.com/ UPCOMING EVENTS:http://holdenweb.eventbrite.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Need debugging knowhow for my creeping Unicodephobia
kj wrote:
I have read a *ton* of stuff on Unicode. It doesn't even seem all
that hard. Or so I think. Then I start writing code, and WHAM:
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position 0: ordinal
not in range(128)
(There, see? My Unicodephobia just went up a notch.)
Here's the thing: I don't even know how to *begin* debugging errors
like this. This is where I could use some help.
a=u'\u0104'
type(a)
type 'unicode'
nu=a.encode('utf-8')
type(nu)
type 'str'
See what I mean? You encode INTO string, and decode OUT OF string.
To make matters more complicated, str.encode() internally DECODES from
string into unicode:
nu
'\xc4\x84'
type(nu)
type 'str'
nu.encode()
Traceback (most recent call last):
File stdin, line 1, in module
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc4 in position 0:
ordinal not in range(128)
There's logic to this, although it makes my brain want to explode. :-)
Regards,
mk
--
http://mail.python.org/mailman/listinfo/python-list
Re: Dreaming of new generation IDE
catonano a écrit : (snip) Today, I tried to understand the twisted.web.client code and I found 3 methods I couldn't find by who were called. I asked on the mailing list and they suggested me where they were called and that the tool for such thing is grep. So, you grep, you get a list of files, you open each one of them and keep scrolling May I suggest reading grep's FineManual ? with proper options, you'll get not only the file, but also the exact lines (and lineno) where the expression appears. If it's this, then it's not experimental at all, it's been done already and been put apart. Crap won :-( Ever read worst is better ?-) Now, image-based systems like Smalltalk do have their share of quirks and drawbacks too. Also, Smalltalk's toolbox can only be used by and for Smalltalk. A bit autistic, he ? I'm doing mostly web development nowadays. That means that I'm constantly switching between server-side code (mostly Python or PHP but can be almost any other language), shell scripts, SQL, html + whatever templating language is used by this project, javascript and css. And of course quite a few configuration file formats... So well, as far as I'm concerned, not having to learn 42+ different toolboxes is a big plus (having to remember 42+ different languages is already hard enough) - I can use a same code editor (Emacs) and standard unix/linux text-handling tools on all my codebase. -- http://mail.python.org/mailman/listinfo/python-list
Re: Terminating threaded programs
In article mailman.1961.1265383809.28905.python-l...@python.org, mk mrk...@gmail.com wrote: I have a problem with a threaded program: it frequently hangs on sys.exit. The problem is that my program uses threads which in turn use paramiko library, which itself is threaded. I try to gracefully close the threads (below), but it doesn't always work, if paramiko calls happen to be at stage of negotiating ssh connection or smth similar. The only workable solution I have is a program sending itself SIGKILL, which makes it terminated by OS (I think so). You can also use os._exit(). -- Aahz (a...@pythoncraft.com) * http://www.pythoncraft.com/ At Resolver we've found it useful to short-circuit any doubt and just refer to comments in code as 'lies'. :-) -- http://mail.python.org/mailman/listinfo/python-list
Re: Any way to turn off exception handling? (debugging)
Steve Holden wrote: I'm getting an exception (on socket) handled in a program I'm trying to debug. I have trouble locating where exactly that happens. If the exception is currently being trapped by a handler in your code It's not my code. you could just insert a raise statement at the start of that handler. This will re-raise the same exception, which will presumably not be caught a second time? I don't know where the handler is, that is precisely a problem. I'm trying to locate that handler. Regards, mk -- http://mail.python.org/mailman/listinfo/python-list
Re: Any way to turn off exception handling? (debugging)
On 11 February 2010 16:17, mk mrk...@gmail.com wrote: I'm getting an exception (on socket) handled in a program I'm trying to debug. I have trouble locating where exactly that happens. In such situation turning exception handling off could be useful, bc unhandled exception stack trace is precisely what I'm trying to obtain. Anybody knows of such possibility? Not as far as I know. Besides, the chances are that if you were to be able to turn off exception handling altogether your code wouldn't make it as far as the code you are interested in anyway. Is there some way you could monkey patch the exception class to add some logging in there or something? -- Cheers, Simon B. -- http://mail.python.org/mailman/listinfo/python-list
Re: Any way to turn off exception handling? (debugging)
Simon Brunning wrote: Not as far as I know. Besides, the chances are that if you were to be able to turn off exception handling altogether your code wouldn't make it as far as the code you are interested in anyway. Sure, but I could deal with that, jerry-rigging the code as exceptions go by, finally reaching the exception I care about. With all the problems, this would still be much better than nothing. As thing are, the only way to do this is guessing and turning particular try / except blocks off. (a really nifty solution would be turning exceptions on or off per module / file basis). IIRC Lua and/or C++ do have this ability, why not Python? I smell material for a PEP. Is there some way you could monkey patch the exception class to add some logging in there or something? Sure I can, but how do I get out of Python the info *what called particular class/instance*? That is, how do I know who's the caller? Regards, mk -- http://mail.python.org/mailman/listinfo/python-list
Re: Dreaming of new generation IDE
I can't believe the code editing situation today is in a such sorry
state.
I can't believe an old coder is feeling so sorry for himself.
Today, I tried to understand the twisted.web.client code and I found 3
methods I couldn't find by who were called.
I asked on the mailing list and they suggested me where they were
called and that the tool for such thing is grep.
So, you grep, you get a list of files, you open each one of them and
keep scrolling and switching from one file to another... endlessly.
Maybe I'm getting old, but I tend to get lost in the process.
Maybe the relevant lesson to be taken from Smalltalk is *not*
put it all in one image
but instead
write code to solve problems, e.g., reading code
I suggest defining a few shell functions to *automate* the search, for
example in zsh
function allf () {
# Recursively find files with suffix matching comma-separated list
in $1.
# For example, allf cpp,hpp finds all *.cpp and *.hpp.
find . -type f | grep -E \.(${1//,/|})$
}
function src () {
# Similar to allf, then search for a regex among the results.
find . -type f -print0 | grep -zE \.(${1//,/|})$ | xargs -0 grep -
lE $2
}
function srcl () {
# Similar to src (see above),
# then search for a pattern among the results,
# and pass matching files to less.
src $1 $2 | xargs less -p $2
}
Smalltalk's images are cool. But they are such a huge hammer, and
they impose so many additional requirements! The costs outweigh the
cool.
-- FC
--
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Re: Need debugging knowhow for my creeping Unicodephobia
In mailman.2379.1265906673.28905.python-l...@python.org mk mrk...@gmail.com writes: To make matters more complicated, str.encode() internally DECODES from string into unicode: nu '\xc4\x84' type(nu) type 'str' nu.encode() Traceback (most recent call last): File stdin, line 1, in module UnicodeDecodeError: 'ascii' codec can't decode byte 0xc4 in position 0: ordinal not in range(128) There's logic to this, although it makes my brain want to explode. :-) Thanks for pointing this one out! It could have easily pushed my Unicodephobia into the incurable zone... ~K -- http://mail.python.org/mailman/listinfo/python-list
Re: Any way to turn off exception handling? (debugging)
On Thu, Feb 11, 2010 at 9:32 AM, mk mrk...@gmail.com wrote: Simon Brunning wrote: Not as far as I know. Besides, the chances are that if you were to be able to turn off exception handling altogether your code wouldn't make it as far as the code you are interested in anyway. Sure, but I could deal with that, jerry-rigging the code as exceptions go by, finally reaching the exception I care about. With all the problems, this would still be much better than nothing. As thing are, the only way to do this is guessing and turning particular try / except blocks off. (a really nifty solution would be turning exceptions on or off per module / file basis). IIRC Lua and/or C++ do have this ability, why not Python? I smell material for a PEP. Um, Lua has nothing even vaguely like Python's exceptions. It has errors, and you can catch them only by doing a protected call. Otherwise they halt the entire interpreter. Python exceptions are pervasive. I don't think you fully understand HOW pervasive they are-- turning off exceptions would utterly break a -vast- amount of Python code. Exceptions are not errors: exceptions are the uncommon, the exceptional, case. If one could somehow turn off exceptions, you can't even do a for loop: every for loop would become infinite-- exceptions are how Python signals the end of an iterator. Think about that, *every* for loop in Python suddenly breaks. They're also used in countless other areas which are simply not errors. Is there some way you could monkey patch the exception class to add some logging in there or something? Sure I can, but how do I get out of Python the info *what called particular class/instance*? That is, how do I know who's the caller? Um... run your code in a debugger. That's what debugger's are -for-. pdb is a simple one. Various IDE's have more advanced ones. I think you're better served showing us what, I'm getting an exception (on socket) handled... actually means, what is actually happening with real code and output, and getting pointers on where to look, then trying to gather material to support an honestly impossible change :) --S -- http://mail.python.org/mailman/listinfo/python-list
Re: Need debugging knowhow for my creeping Unicodephobia
mk wrote:
kj wrote:
I have read a *ton* of stuff on Unicode. It doesn't even seem all
that hard. Or so I think. Then I start writing code, and WHAM:
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position
0: ordinal not in range(128)
(There, see? My Unicodephobia just went up a notch.)
Here's the thing: I don't even know how to *begin* debugging errors
like this. This is where I could use some help.
a=u'\u0104'
type(a)
type 'unicode'
nu=a.encode('utf-8')
type(nu)
type 'str'
See what I mean? You encode INTO string, and decode OUT OF string.
Traditionally strings were string of byte-sized characters. Because they
were byte-sided they could also be used to contain binary data.
Then along came Unicode.
When working with Unicode in Python 2, you should use the 'unicode' type
for text (Unicode strings) and limit the 'str' type to binary data
(bytestrings, ie bytes) only.
In Python 3 they've been renamed to 'str' for Unicode _strings_ and
'bytes' for binary data (bytes!).
To make matters more complicated, str.encode() internally DECODES from
string into unicode:
nu
'\xc4\x84'
type(nu)
type 'str'
nu.encode()
Traceback (most recent call last):
File stdin, line 1, in module
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc4 in position 0:
ordinal not in range(128)
There's logic to this, although it makes my brain want to explode. :-)
Strictly speaking, only Unicode can be encoded.
What Python 2 is doing here is trying to be helpful: if it's already a
bytestring then decode it first to Unicode and then re-encode it to a
bytestring.
Unfortunately, the default encoding is ASCII, and the bytestring isn't
valid ASCII. Python 2 is being 'helpful' in a bad way!
--
http://mail.python.org/mailman/listinfo/python-list
Re: ANN: obfuscate
Christian Heimes wrote: Gregory Ewing wrote: Actually I gather it had a lot to do with the fact that the Germans made some blunders in the way they used the Enigma that seriously compromised its security. There was reportedly a branch of the German forces that used their Enigmas differently, avoiding those mistakes, and the British never managed to crack any of their messages. IIRC some versions of the Enigma weren't cracked because they used a different setup and different daily keys. The predecessor of the Enigma was cracked by Polish scientists years before WW2 started. Some flaws in the instructions and a known plain text attack made the crack of the Enigma practical. It took the British scientists merely hours rather than days or weeks to decipher the daily key with some smart tricks. For example they started fake attacks on ships or cities just to have the names in some encrypted reports. In some cases the British had decoded the messages before the intended recipient! The Americans decoded Japanese messages about an planned attack on an island, but didn't know which one because of the fake names, so they instructed their bases to report certain problems in a way that the Japanese could decode. Midway reported a shortage of water, the Japanese decoded it and sent a message about it, the Americans decoded their message and discovered that island's fake name, and thus found out that Midway was the intended target of the attack. -- http://mail.python.org/mailman/listinfo/python-list
Re: Any way to turn off exception handling? (debugging)
the uncommon, the exceptional, case. If one could somehow turn off exceptions, you can't even do a for loop: every for loop would become infinite-- exceptions are how Python signals the end of an iterator. Think about that, *every* for loop in Python suddenly breaks. Ouch. Sure I can, but how do I get out of Python the info *what called particular class/instance*? That is, how do I know who's the caller? Um... run your code in a debugger. ..except the code in question is multithreaded and pdb is no good for that, and last time I checked, yappi was broken. That's what debugger's are -for-. pdb is a simple one. Various IDE's have more advanced ones. I tried using pdb on paramiko and my own threaded code, lost some hair in the process, and gave up. It's good for tracing the main thread, basically, not for threading.Threads. I think you're better served showing us what, I'm getting an exception (on socket) handled... actually means, what is actually happening with real code and output, and getting pointers on where to look, then trying to gather material to support an honestly impossible change :) I'm using a threaded library paramiko (probably by now half of this group is sick of hearing me saying this again). 2 of (rather broken) hosts (Solaris, Linux) are really, really slow when responding over SSH, like a minute for a key exchange. In paramiko, timeout doesn't work bc the timeout specified there is timeout for a socket and not for SSH. When calling transport.socket.close() via threading.Timer like this: def printandclose(self): print \ntrying to close transport.sock self.trans.sock.close() self.flag = True self.flag = False timer = threading.Timer(4, self.printandclose) timer.start() self.trans.start_client() timer.cancel() ... I'm getting this on the console: ERROR (9, 'Bad file descriptor') According to a guy who is very knowledgable on the library (thanks for all the help, James) this is result of catching socket.error somewhere in paramiko code, like except socket.error. I need to find that place. On top of lack of proper handling of timeouts, this is important bc when calling paramiko SSHClient.connect() (which in turn uses the same machinery as transport.start_client IIRC) paramiko uses close to 100% of CPU when negotiating with such broken or unresponsive hosts. For my reasons, I need to get this fixed. Regards, mk -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: obfuscate
Paul Rubin wrote: Gregory Ewing greg.ew...@canterbury.ac.nz writes: Actually I gather it had a lot to do with the fact that the Germans made some blunders in the way they used the Enigma that seriously compromised its security. There was reportedly a branch of the German forces that used their Enigmas differently, avoiding those mistakes, and the British never managed to crack any of their messages. I think you are thinking of the Kriegsmarine (naval) Enigma. Yes they were more careful with procedures, but the machine was also harder to crack because it had four rotors instead of three. IIRC, the Brits were eventually (1942?) able to capture one by shooting up a German submarine and boarding it to get the machine while the sub was sinking; a British sailor wasn't able to get out in time and drowned during that operation. Getting the rotor settings off the captured unit (they may have had to do it more than once) was enough to get a foothold into the code. My memory is hazy on this by now so I may have some parts wrong, but David Kahn's book Seizing the Enigma tells the story (I read it many years ago). A fictionalized version appears in Neil Stephenson's novel Cryptonomicon. U-559? I think that's the one where Hollywood made a film about it, but portraying it as a purely American action. That didn't go down too well in the UK! -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: obfuscate
Paul Rubin wrote: Gregory Ewing greg.ew...@canterbury.ac.nz writes: Actually I gather it had a lot to do with the fact that the Germans made some blunders in the way they used the Enigma that seriously compromised its security. There was reportedly a branch of the German forces that used their Enigmas differently, avoiding those mistakes, and the British never managed to crack any of their messages. I think you are thinking of the Kriegsmarine (naval) Enigma. Yes they were more careful with procedures, but the machine was also harder to crack because it had four rotors instead of three. IIRC, the Brits were eventually (1942?) able to capture one by shooting up a German submarine and boarding it to get the machine while the sub was sinking; a British sailor wasn't able to get out in time and drowned during that operation. Getting the rotor settings off the captured unit (they may have had to do it more than once) was enough to get a foothold into the code. My memory is hazy on this by now so I may have some parts wrong, but David Kahn's book Seizing the Enigma tells the story (I read it many years ago). A fictionalized version appears in Neil Stephenson's novel Cryptonomicon. U-559? I think that's the one where Hollywood made a film about it, but portraying it as a purely American action. That didn't go down too well in the UK! -- http://mail.python.org/mailman/listinfo/python-list
Re: Any way to turn off exception handling? (debugging)
mk mrk...@gmail.com writes: Um... run your code in a debugger. ..except the code in question is multithreaded and pdb is no good for that, and last time I checked, yappi was broken. Try winpdb.org. -- http://mail.python.org/mailman/listinfo/python-list
Re: Any way to turn off exception handling? (debugging)
Stephen Hansen wrote: the uncommon, the exceptional, case. If one could somehow turn off exceptions, you can't even do a for loop: every for loop would become infinite-- exceptions are how Python signals the end of an iterator. Think about that, *every* for loop in Python suddenly breaks. Hmm what if one could turn off exception handling for particular exception classes? -- http://mail.python.org/mailman/listinfo/python-list
Re: Any way to turn off exception handling? (debugging)
mk wrote: the uncommon, the exceptional, case. If one could somehow turn off exceptions, you can't even do a for loop: every for loop would become infinite-- exceptions are how Python signals the end of an iterator. Think about that, *every* for loop in Python suddenly breaks. Ouch. Sure I can, but how do I get out of Python the info *what called particular class/instance*? That is, how do I know who's the caller? Um... run your code in a debugger. ..except the code in question is multithreaded and pdb is no good for that, and last time I checked, yappi was broken. That's what debugger's are -for-. pdb is a simple one. Various IDE's have more advanced ones. I tried using pdb on paramiko and my own threaded code, lost some hair in the process, and gave up. It's good for tracing the main thread, basically, not for threading.Threads. I think you're better served showing us what, I'm getting an exception (on socket) handled... actually means, what is actually happening with real code and output, and getting pointers on where to look, then trying to gather material to support an honestly impossible change :) I'm using a threaded library paramiko (probably by now half of this group is sick of hearing me saying this again). 2 of (rather broken) hosts (Solaris, Linux) are really, really slow when responding over SSH, like a minute for a key exchange. In paramiko, timeout doesn't work bc the timeout specified there is timeout for a socket and not for SSH. When calling transport.socket.close() via threading.Timer like this: def printandclose(self): print \ntrying to close transport.sock self.trans.sock.close() self.flag = True self.flag = False timer = threading.Timer(4, self.printandclose) timer.start() self.trans.start_client() timer.cancel() ... I'm getting this on the console: ERROR (9, 'Bad file descriptor') According to a guy who is very knowledgable on the library (thanks for all the help, James) this is result of catching socket.error somewhere in paramiko code, like except socket.error. I need to find that place. On top of lack of proper handling of timeouts, this is important bc when calling paramiko SSHClient.connect() (which in turn uses the same machinery as transport.start_client IIRC) paramiko uses close to 100% of CPU when negotiating with such broken or unresponsive hosts. For my reasons, I need to get this fixed. You could try to shadow the exception class with None: ZeroDivisionError = None try: ... 1/0 ... except ZeroDivisionError: ... print caught ... Traceback (most recent call last): File stdin, line 2, in module ZeroDivisionError: integer division or modulo by zero Applying that technique on a module containing try: ... except socket.error: ... #untested import socket class SocketWrapper: def __getattr__(self, name): return getattr(socket, name) error = None import module_using_socket module_using_socket.socket = SocketWrapper() Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: Any way to turn off exception handling? (debugging)
mk wrote: Stephen Hansen wrote: the uncommon, the exceptional, case. If one could somehow turn off exceptions, you can't even do a for loop: every for loop would become infinite-- exceptions are how Python signals the end of an iterator. Think about that, *every* for loop in Python suddenly breaks. Hmm what if one could turn off exception handling for particular exception classes? An extension of the warnings mechanism might be the easiest way to play with an implementation ... regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 PyCon is coming! Atlanta, Feb 2010 http://us.pycon.org/ Holden Web LLC http://www.holdenweb.com/ UPCOMING EVENTS:http://holdenweb.eventbrite.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: obfuscate
Christian Heimes wrote: Gregory Ewing wrote: Actually I gather it had a lot to do with the fact that the Germans made some blunders in the way they used the Enigma that seriously compromised its security. There was reportedly a branch of the German forces that used their Enigmas differently, avoiding those mistakes, and the British never managed to crack any of their messages. IIRC some versions of the Enigma weren't cracked because they used a different setup and different daily keys. The predecessor of the Enigma was cracked by Polish scientists years before WW2 started. Some flaws in the instructions and a known plain text attack made the crack of the Enigma practical. It took the British scientists merely hours rather than days or weeks to decipher the daily key with some smart tricks. For example they started fake attacks on ships or cities just to have the names in some encrypted reports. I believe that all of Enigma was eventually cracked cos of two major flaws. 1) A letter could never be sent as itself. 2) The Luftwaffe were very poor when compared to the Wehrmacht or Kriegsmarine about security so they were a major leak of data regarding the other organisations. 3) The users instead of using random three letter combinations kept using the same ones. HIT LER and BER LIN were popular, but the most famous one at Bletchley Park was the name of the guy's girlfriend. Further, the far more powerful Geheimscreiber was also cracked at Bletchley by using Colossus. Sorry some years since I read the book about this so can't remember the title or author. Regards. Mark Lawrence. -- http://mail.python.org/mailman/listinfo/python-list
Re: Terminating threaded programs
On Feb 11, 2010, at 11:43 AM, Aahz wrote: In article mailman.1961.1265383809.28905.python-l...@python.org, mk mrk...@gmail.com wrote: I have a problem with a threaded program: it frequently hangs on sys.exit. The problem is that my program uses threads which in turn use paramiko library, which itself is threaded. I try to gracefully close the threads (below), but it doesn't always work, if paramiko calls happen to be at stage of negotiating ssh connection or smth similar. The only workable solution I have is a program sending itself SIGKILL, which makes it terminated by OS (I think so). You can also use os._exit(). This just came up on the Twisted IRC channel last night and came to the same conclusion. Python's going to wait for threads to terminate and if they're not going to, neither is Python. os._exit() came up as the 'last resort' way out of the app. S -- http://mail.python.org/mailman/listinfo/python-list
Re: Any way to turn off exception handling? (debugging)
Paul Rubin wrote: mk mrk...@gmail.com writes: Um... run your code in a debugger. ..except the code in question is multithreaded and pdb is no good for that, and last time I checked, yappi was broken. Try winpdb.org. This is a treasure! In minutes I've had this attached to remote process and debugging threads. Muchos gracias Paul! Regards, mk -- http://mail.python.org/mailman/listinfo/python-list
python and http POST
Hey All,
Been teaching myself Python for a few weeks, and am trying to write a
program that will go to a url, enter a string in one of the search
fields, submit the search, and return the contents of the search
result.
I'm using httplib2.
My two particular questions:
1) When I set my 'body' var, (i.e. 'body = {'query':'search_term'}),
how do I know what the particular key should be? In other words, how
do I tell python which form on the web page I'm visiting I'd like to
fill in? Do I simply go to the webpage itself and look at the html
source? But if that's the case, which tag tells me the name of the
key?
2) Even once python fills in the form properly, how can I tell it to
'submit' the search?
Thanks all!
Matt
--
http://mail.python.org/mailman/listinfo/python-list
Re: Any way to turn off exception handling? (debugging)
Peter Otten wrote: try: ... except socket.error: ... #untested import socket class SocketWrapper: def __getattr__(self, name): return getattr(socket, name) error = None import module_using_socket module_using_socket.socket = SocketWrapper() Very interesting solution. Thanks! Regards, mk -- http://mail.python.org/mailman/listinfo/python-list
Re: python crash on windows but not on linux
On Feb 11, 7:01 pm, Peter Otten __pete...@web.de wrote: hjebbers wrote: On Feb 11, 5:45 pm, M3RT mgul...@gmail.com wrote: The problem may be related to how you treat the EDI file or lets say DATA. Also your coding style is important. Can you provide more info? Yes, a whole lot more; but I do not want to bother you with that now. I was just wondering if it is possible that the same setup gives a CRASH! on windows and just works on linux. (where is the bug?) In the platform-specific code ;) Even on alt.haruspicy they cannot do much without a liver now and then... if it is in the platform-specific code should I make this into a bugreport? (because the crash does not appear at the same place in my code (when doing the same test-run) it will be quite hard to point down) henk-jan -- http://mail.python.org/mailman/listinfo/python-list
Re: python crash on windows but not on linux
On Feb 11, 7:01 pm, Peter Otten __pete...@web.de wrote: hjebbers wrote: On Feb 11, 5:45 pm, M3RT mgul...@gmail.com wrote: The problem may be related to how you treat the EDI file or lets say DATA. Also your coding style is important. Can you provide more info? Yes, a whole lot more; but I do not want to bother you with that now. I was just wondering if it is possible that the same setup gives a CRASH! on windows and just works on linux. (where is the bug?) In the platform-specific code ;) Even on alt.haruspicy they cannot do much without a liver now and then... if it is in the platform-specific code should I make this into a bugreport? (because the crash does not appear at the same place in my code (when doing the same test-run) it will be quite hard to point down) henk-jan -- http://mail.python.org/mailman/listinfo/python-list
MODULE FOR I, P FRAME
Hello! I am currently developing a simple video player in python, and my problem is that i can't find a module which has a function that can determine if frame(image) is I or P coded (MPEG coding). I have been using PIL but I couldnt find anything that could help me with that problem. Thanks for sugestions! -- http://mail.python.org/mailman/listinfo/python-list
Re: python crash on windows but not on linux
On Thu, Feb 11, 2010 at 9:32 AM, hjebbers hjebb...@gmail.com wrote: To all, I am running an EDI translator, and doing stress tests. When processing a test with a (relatively) big EDI file(s) on windowsXP I get a crash: 'sorry for the inconvenience' etc (so no clues about what is causing the problem) You need to give us more information if we're going to be able to help. At the very least, you'll need to copy paste the actual error message. It would be even better if you could show us some of your code, and better yet if you could give us a small bit of code that is self contained and reproduces the problem you're experiencing. -- Jerry -- http://mail.python.org/mailman/listinfo/python-list
Re: python crash on windows but not on linux
On Feb 11, 7:01 pm, Peter Otten __pete...@web.de wrote: hjebbers wrote: On Feb 11, 5:45 pm, M3RT mgul...@gmail.com wrote: The problem may be related to how you treat the EDI file or lets say DATA. Also your coding style is important. Can you provide more info? Yes, a whole lot more; but I do not want to bother you with that now. I was just wondering if it is possible that the same setup gives a CRASH! on windows and just works on linux. (where is the bug?) In the platform-specific code ;) Even on alt.haruspicy they cannot do much without a liver now and then... if it is in the platform-specific code should I make this into a bugreport? (because the crash does not appear at the same place in my code (when doing the same test-run) it will be quite hard to point down) henk-jan -- http://mail.python.org/mailman/listinfo/python-list
PExpect Cross-Platform Alternative
Hello Community, Recently I've been automating lots of network operations tasks via simple python scripts. Originally, I utilized paramiko but found that the module had issues working with cisco equipment. I switched to pexpect and things have worked wonderfully since (I've been running this scripts in a Linux environment). However, I was just tasked to get these scripts running in a windows environment and to my dismay very quickly realized that pexpect is not cross platform compatible. Am I stuck, or are there solutions out there? Cheers! Nathan -- The men the American people admire most extravagantly are the most daring liars; the men they detest most violently are those who try to tell them the truth. -- H. L. Mencken -- http://mail.python.org/mailman/listinfo/python-list
Re: Modifying Class Object
* Steve Holden: Alf P. Steinbach wrote: * Steven D'Aprano: [...] accusing them of lying for having an opinion that differs from yours, That is untrue. Well, that says it all really. You seem to insinuate that I'm saying that Steven is lying, and/or that Steven is lying. From context and your earlier similar behavior, I presume the former only. Anyway that's a *very* dirty insinuation. And ... It seems you *do not understand* the difference between an incorrect statement and a lie. Which is very telling, I'm sorry. And you have yet again concentrated on a personal attack via insinuation etc., diversion, which also is very telling, sorry. Cheers, - Alf -- http://mail.python.org/mailman/listinfo/python-list
Re: python and http POST
Use tamperdata to view and modify HTTP/HTTPS headers and post
parameters...
https://addons.mozilla.org/en-US/firefox/addon/966
Enjoy,
Ken
galileo228 wrote:
Hey All,
Been teaching myself Python for a few weeks, and am trying to write a
program that will go to a url, enter a string in one of the search
fields, submit the search, and return the contents of the search
result.
I'm using httplib2.
My two particular questions:
1) When I set my 'body' var, (i.e. 'body = {'query':'search_term'}),
how do I know what the particular key should be? In other words, how
do I tell python which form on the web page I'm visiting I'd like to
fill in? Do I simply go to the webpage itself and look at the html
source? But if that's the case, which tag tells me the name of the
key?
2) Even once python fills in the form properly, how can I tell it to
'submit' the search?
Thanks all!
Matt
--
http://mail.python.org/mailman/listinfo/python-list
Re: PExpect Cross-Platform Alternative
Nathan Farrar wrote: Hello Community, Recently I've been automating lots of network operations tasks via simple python scripts. Originally, I utilized paramiko but found that the module had issues working with cisco equipment. I switched to pexpect and things have worked wonderfully since (I've been running this scripts in a Linux environment). However, I was just tasked to get these scripts running in a windows environment and to my dismay very quickly realized that pexpect is not cross platform compatible. Am I stuck, or are there solutions out there? It works pretty well under Cygwin (which also improves your Windows scripting environment no end). Any chance you would be allowed to install that? regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 PyCon is coming! Atlanta, Feb 2010 http://us.pycon.org/ Holden Web LLC http://www.holdenweb.com/ UPCOMING EVENTS:http://holdenweb.eventbrite.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Modifying Class Object
* Steve Holden: Alf P. Steinbach wrote: * Steve Holden: [...] In this particular part of the thread I am attempting, unsuccessfully, to convince you that a change in *your* behavior would lead to less hostility directed towards the way you present your ideas. You apparently feel it is quite acceptable to tell people to learn to read, I have not used that expression. However I have suggest and emphasized that it might help to *read* whatever one quotes, when the quoted material (such as one paragraph) has not been read. Telling someone to learn to read is a Steve Holden'sk way to imply that the person is an ignoramus who hasn't bothered to learn to read. Telling a person to read something that's obviously not been read is quite another matter. So, you are misrepresenting -- again -- and in a quite revealing way, sorry. Pardon me? You used it on December 16 in a response to Mensanator in message hgbri8$e1...@news.eternal-september.org M : How about devoting a section on downloading the source files M : and compiling it on a Mac? AS: Learn to read. AS: At the top of every second page it tells you that this is an AS: introduction based on Windows. I am sure you will have some glib response as to why this wasn't rude at all. Allow me to correct you - it was, and rudeness is not welcomed on comp.lang.python. That doesn't mean it doesn't happen (why, I have even been known to be rude myself - we are none of us perfect, after all). I have already given ample evidence that when I am wrong I will admit it. You, contrariwise, maintain that you will admit when you are wrong (I believe 40% of the time was the figure you used) No, 40% of contested cases. But that was sort of a white lie. I'm not that often wrong, and anyway it doesn't apply to me in [comp.lang.python] so far. It only applies to groups where only things that might be incorrect are challenged. but I fail to remember any single incident when you made such an admission. Your memory seems to be very very bad, since I've stated I've been wrong also in direct debates with you. But one person who /does/ have severe trouble admitting that he's wrong, going to the extreme of ad hominem attacks and using terms such as wring to avoid saying it (it's quite amazing, almost unbelievable) is Steve Holden. Anyway, I was wrong about not having used that phrase learn to read. I'm not sure if I ever apologized directly to Mensanator for that, and now it's history, but what I do know I did was to follow up on that comment of his, making changes, and to acknowledge him for that in the [ack.txt] listing. Any reader might draw conclusions from that, e.g. what I positively did or what I possibly forgot to do -- we're not perfect beings any of us. [Steve Holden rambling with personal characterizations circular logic snipped] Cheers hth., - Alf -- http://mail.python.org/mailman/listinfo/python-list
Re: Terminating threaded programs
Stephen Hansen wrote: I use threads all the time (well, for certain types of workloads) and have never seen this. Are your threads daemon threads? The only time I've seen sys.exit() not close out my program is when I'm launching non-daemon threads on accident. The snag is that my program is using calls to another threaded library (paramiko) which does lots of stuff with sockets and communication (SSH). Paramiko in turn calls Crypto which has compiled C extensions. I really don't know what's going on in there, just guessing that this might trigger this behavior. Now, I do get some slightly random errors on close due to threads doing stuff or returning from doing stuff while the shutdown procedure is going on, but I don't really care, cuz, well, I'm shutting everything down and nothing worth knowing is going on in the rest of the program. Same as me, except I get lots of exceptions in threads if I shut down with sys.exit. SIGTERM somehow gets around this problem. I'll try os._exit. Regards, mk -- http://mail.python.org/mailman/listinfo/python-list
Re: Terminating threaded programs
Aahz wrote: You can also use os._exit(). Thanks! -- http://mail.python.org/mailman/listinfo/python-list
Re: Terminating threaded programs
Aahz wrote: You can also use os._exit(). Yes! It works cleanly! Thanks a million! OTOH, if I use sys.exit(), it's just hanging there. Regards, mk -- http://mail.python.org/mailman/listinfo/python-list
Re: Is a merge interval function available?
On Feb 10, 3:23 pm, Peng Yu pengyu...@gmail.com wrote:
I'm wondering there is already a function in python library that can
merge intervals. For example, if I have the following intervals ('['
and ']' means closed interval as
inhttp://en.wikipedia.org/wiki/Interval_(mathematics)#Excluding_the_end...)
[1, 3]
[2, 9]
[10,13]
[11,12]
I want to get the following merged intervals.
[1,9]
[10,13]
Could somebody let me know if there is a function in the python
library?
I vaguely recall a similar question a long time ago. Peng, is this a
homework assignment?
Perhaps we should add a standard module called homework. It can have
functions for all the different homework assignments we see on
c.l.python. We can simply point people to this module and then can
include the code in their answers.
--
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Re: Is a merge interval function available?
* Jonathan Gardner:
On Feb 10, 3:23 pm, Peng Yu pengyu...@gmail.com wrote:
I'm wondering there is already a function in python library that can
merge intervals. For example, if I have the following intervals ('['
and ']' means closed interval as
inhttp://en.wikipedia.org/wiki/Interval_(mathematics)#Excluding_the_end...)
[1, 3]
[2, 9]
[10,13]
[11,12]
I want to get the following merged intervals.
[1,9]
[10,13]
Could somebody let me know if there is a function in the python
library?
I vaguely recall a similar question a long time ago. Peng, is this a
homework assignment?
Perhaps we should add a standard module called homework. It can have
functions for all the different homework assignments we see on
c.l.python. We can simply point people to this module and then can
include the code in their answers.
If it's possible, there was/is this guy over in clc.c++ who responded/responds
to homework questions with the most advanced, convoluted and, except for
misleading names, technically correct solutions.
Cheers,
- Alf
--
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Re: Need debugging knowhow for my creeping Unicodephobia
MRAB wrote: When working with Unicode in Python 2, you should use the 'unicode' type for text (Unicode strings) and limit the 'str' type to binary data (bytestrings, ie bytes) only. Well OK, always use u'something', that's simple -- but isn't str what I get from files and sockets and the like? In Python 3 they've been renamed to 'str' for Unicode _strings_ and 'bytes' for binary data (bytes!). Neat, except that the process of porting most projects and external libraries to P3 seems to be, how should I put it, standing still? Or am I wrong? But that's the impression I get? Take web frameworks for example. Does any of them have serious plans and work in place to port to P3? Strictly speaking, only Unicode can be encoded. How so? Can't bytestrings containing characters of, say, koi8r encoding be encoded? What Python 2 is doing here is trying to be helpful: if it's already a bytestring then decode it first to Unicode and then re-encode it to a bytestring. It's really cumbersome sometimes, even if two libraries are written by one author: for instance, Mako and SQLAlchemy are written by the same guy. They are both top-of-the line in my humble opinion, but when you connect them you get things like this: 1. you query SQLAlchemy object, that happens to have string fields in relational DB. 2. Corresponding Python attributes of those objects then have type str, not unicode. 3. then I pass those objects to Mako for HTML rendering. Typically, it works: but if and only if a character in there does not happen to be out of ASCII range. If it does, you get UnicodeDecodeError on an unsuspecting user. Sure, I wrote myself a helper that iterates over keyword dictionary to make sure to convert all str to unicode and only then passes the dictionary to render_unicode. It's an overhead, though. It would be nicer to have it all unicode from db and then just pass it for rendering and having it working. (unless there's something in filters that I missed, but there's encoding of templates, tags, but I didn't find anything on automatic conversion of objects passed to method rendering template) But maybe I'm whining. Unfortunately, the default encoding is ASCII, and the bytestring isn't valid ASCII. Python 2 is being 'helpful' in a bad way! And the default encoding is coded in such way so it cannot be changed in sitecustomize (without code modification, that is). Regards, mk -- http://mail.python.org/mailman/listinfo/python-list
calculating a string equation
Hi,
I have some variables in my script that looks like this:
vars = {'var_a':'10','var_b':'4'}
eqat = (var_a/2.0) = var_b
result = (var_a+var_b)/7
What I'm trying to do is to plug in var_a and var_b's values from vars
into eqat and see if eqat returns true or false as well as getting the
value of result if these variables were plugged in. How do I do this?
I'm also expecting eqat and result to contain various python
mathematical operators like **, and compounded ()'s.
I'm not sure how to convert the equation; if I have to make a bunch of
if-statements or if there is a python function that already does
something like this.
Thanks for any help.
Cheers
Astan
--
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Re: Need debugging knowhow for my creeping Unicodephobia
On 2010-02-11 15:43 PM, mk wrote: MRAB wrote: Strictly speaking, only Unicode can be encoded. How so? Can't bytestrings containing characters of, say, koi8r encoding be encoded? I think he means that only unicode objects can be encoded using the .encode() method, as clarified by his next sentence: What Python 2 is doing here is trying to be helpful: if it's already a bytestring then decode it first to Unicode and then re-encode it to a bytestring. -- 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: calculating a string equation
Astan Chee astan.c...@al.com.au writes:
Hi,
I have some variables in my script that looks like this:
vars = {'var_a':'10','var_b':'4'}
eqat = (var_a/2.0) = var_b
result = (var_a+var_b)/7
What I'm trying to do is to plug in var_a and var_b's values from vars
into eqat and see if eqat returns true or false as well as getting the
value of result if these variables were plugged in. How do I do
this?
I'm also expecting eqat and result to contain various python
mathematical operators like **, and compounded ()'s.
I'm not sure how to convert the equation; if I have to make a bunch of
if-statements or if there is a python function that already does
something like this.
Yes: eval()
vars = {'var_a':10 ,'var_b':4}
eqat = (var_a/2.0) = var_b
result = (var_a+var_b)/7
eval(eqat, vars)
False
eval(result, vars)
2
(Note that I have slightly modified your vars dictionary)
See a recent thread about the dangers of eval().
--
Arnaud
--
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Re: Modifying Class Object
On 2/11/2010 1:37 AM, Alf P. Steinbach wrote: Consider just the assert( t is not s ) t = s Does this change anything at all in the computer's memory? By 'computer', do you mean 'anything that computes' (including humans) or specifically 'electronic computer'? But since it does have an effect, a memory change has been effected. Agreed, in whatever 'memory' the 'computer' is using. You describe that memory change as that t has been bound to the same object as s. I prefer to use the word 'associated': namespaces are a many-to-one association between names and objects. By which you mean that henceforth, until the next assignment to t, t *refers* to the same object as s. T and s are both associated with the same object. That explanation in terms of refers is necessary. I disagree No beginner knows what it means that a name is bound to something means, until it's been explained. I agree, which is why I am trying to avoid 'bound', etc, in favor of 'associated'. One problem of 'bind' is that it sometimes raises the question of which is bound to which. 'Associated' avoids that. The explanation is necessarily in terms of refers to. I have given an alternative, even if you still prefer yours. When something A refers to something B, then by definition A is a *reference* to B. I presume you agree that the name 'Alf P. Steinbach' refers to you. Do you then consider it to be a 'reference' to you? In either case, the Python definition uses 'refers to' in the same way that names refer to people, and did even before names were used in electro-mechanical computer programming. Steven D'Aprano: My version describes what happens at the level of high-level Python code, which is the defined semantics of the language. It makes no assumptions about the implementation, completely unlike yours which is entirely implementation- specific. My description is equally valid whether Python is being executed by the CPython virtual machine on an Intel-compatible processor, or hand-simulated with pencil and paper, or something completely different. Yours is not. About 13 years ago, I noticed that electronically executable Python was very similar to some of the designed-for-human-reading algoritm languages (pseudocode) that were not. I then coined the oxymoron 'executable pseudocode' for Python. I see the difference between the descriptions as reflecting the difference between Python, the executable algorithm language and Python, the machine programming language. I describe the high-level language, you describe one implementation. Neither view is *wrong*, per se, but one describes the semantics of the language while the other describes the implementation. I think anyone writing books using Python should at least understand the abstract view even if he prefers to write from the more concrete view. Terry Jan Reedy -- http://mail.python.org/mailman/listinfo/python-list
Re: Modifying Class Object
* Terry Reedy: On 2/11/2010 1:37 AM, Alf P. Steinbach wrote: Consider just the assert( t is not s ) t = s Does this change anything at all in the computer's memory? By 'computer', do you mean 'anything that computes' (including humans) or specifically 'electronic computer'? In this context I mean the virtual machine that a Python language assumes. Doesn't matter if it's electronic or a pen-and-pencil simulation. But since it does have an effect, a memory change has been effected. Agreed, in whatever 'memory' the 'computer' is using. You describe that memory change as that t has been bound to the same object as s. I prefer to use the word 'associated': namespaces are a many-to-one association between names and objects. By which you mean that henceforth, until the next assignment to t, t *refers* to the same object as s. T and s are both associated with the same object. That explanation in terms of refers is necessary. I disagree No beginner knows what it means that a name is bound to something means, until it's been explained. I agree, which is why I am trying to avoid 'bound', etc, in favor of 'associated'. One problem of 'bind' is that it sometimes raises the question of which is bound to which. 'Associated' avoids that. The explanation is necessarily in terms of refers to. I have given an alternative, even if you still prefer yours. Associated is just less precise than refers. Associated is two-way. Anyway it's just a term, and if you define it to mean a one-way reference, then nothing substantial is changed except more room for misunderstanding. When something A refers to something B, then by definition A is a *reference* to B. I presume you agree that the name 'Alf P. Steinbach' refers to you. Do you then consider it to be a 'reference' to you? Yes, and that's irrelevant, because you can't change a name. It's a slightly different meaning. But a name edit field with my name in it most probably refers to me. In either case, the Python definition uses 'refers to' in the same way that names refer to people, and did even before names were used in electro-mechanical computer programming. That's so subtle a distinction that it appears meaningless to me. It says refers to but doesn't mean refers to? Steven D'Aprano: My version describes what happens at the level of high-level Python code, which is the defined semantics of the language. It makes no assumptions about the implementation, completely unlike yours which is entirely implementation- specific. My description is equally valid whether Python is being executed by the CPython virtual machine on an Intel-compatible processor, or hand-simulated with pencil and paper, or something completely different. Yours is not. About 13 years ago, I noticed that electronically executable Python was very similar to some of the designed-for-human-reading algoritm languages (pseudocode) that were not. I then coined the oxymoron 'executable pseudocode' for Python. I see the difference between the descriptions as reflecting the difference between Python, the executable algorithm language and Python, the machine programming language. I describe the high-level language, you describe one implementation. Neither view is *wrong*, per se, but one describes the semantics of the language while the other describes the implementation. I think anyone writing books using Python should at least understand the abstract view even if he prefers to write from the more concrete view. It seems to me that you lack an understanding of the abstract here, going into imagined and not concretely discussed differences between refers to and refers to. Until or if (but I think it unlikely) you can explain clearly what that difference between refers to and refers to is, it's just wordplay. Cheers hth., - Alf -- http://mail.python.org/mailman/listinfo/python-list
Re: Need debugging knowhow for my creeping Unicodephobia
mk wrote: MRAB wrote: When working with Unicode in Python 2, you should use the 'unicode' type for text (Unicode strings) and limit the 'str' type to binary data (bytestrings, ie bytes) only. Well OK, always use u'something', that's simple -- but isn't str what I get from files and sockets and the like? Yes, which is why you need to know what encoding was used to create it. In Python 3 they've been renamed to 'str' for Unicode _strings_ and 'bytes' for binary data (bytes!). Neat, except that the process of porting most projects and external libraries to P3 seems to be, how should I put it, standing still? Or am I wrong? But that's the impression I get? No, it's probably not going as quickly as you would like, but it's certainly not standing still. Some of these libraries are substantial works, and there were changes to the C API that take quite a bit of work to adapt existing code to. Take web frameworks for example. Does any of them have serious plans and work in place to port to P3? There have already been demonstrations of partially-working Python 3 Django. I can't speak to the rest. Strictly speaking, only Unicode can be encoded. How so? Can't bytestrings containing characters of, say, koi8r encoding be encoded? It's just terminology. If a bytestring contains koi8r characters then (as you unconsciously recognized by your use of the word encoding) it already *has* been encoded. What Python 2 is doing here is trying to be helpful: if it's already a bytestring then decode it first to Unicode and then re-encode it to a bytestring. It's really cumbersome sometimes, even if two libraries are written by one author: for instance, Mako and SQLAlchemy are written by the same guy. They are both top-of-the line in my humble opinion, but when you connect them you get things like this: 1. you query SQLAlchemy object, that happens to have string fields in relational DB. 2. Corresponding Python attributes of those objects then have type str, not unicode. Yes, a relational database will often return ASCII, but nowadays people are increasingly using encoded Unicode. In that case you need to be aware of the encoding that has been used to render the Unicode values into the byte strings (which in Python 2 are of type str) so that you can decode them into Unicode. 3. then I pass those objects to Mako for HTML rendering. Typically, it works: but if and only if a character in there does not happen to be out of ASCII range. If it does, you get UnicodeDecodeError on an unsuspecting user. Well first you need to be clear what you are passing to Mako. Sure, I wrote myself a helper that iterates over keyword dictionary to make sure to convert all str to unicode and only then passes the dictionary to render_unicode. It's an overhead, though. It would be nicer to have it all unicode from db and then just pass it for rendering and having it working. (unless there's something in filters that I missed, but there's encoding of templates, tags, but I didn't find anything on automatic conversion of objects passed to method rendering template) Some database modules will distinguish between fields of type varchar and nvarchar, returning Unicode objects for the latter. You will need to ensure that the module knows which encoding is used in the database. This is usually automatic. But maybe I'm whining. Nope, just struggling with a topic that is far from straightforward the first time you encounter it. Unfortunately, the default encoding is ASCII, and the bytestring isn't valid ASCII. Python 2 is being 'helpful' in a bad way! And the default encoding is coded in such way so it cannot be changed in sitecustomize (without code modification, that is). Yes, the default encoding is not always convenient. regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 PyCon is coming! Atlanta, Feb 2010 http://us.pycon.org/ Holden Web LLC http://www.holdenweb.com/ UPCOMING EVENTS:http://holdenweb.eventbrite.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: python crash on windows but not on linux
On Feb 11, 8:42 pm, Jerry Hill malaclyp...@gmail.com wrote: On Thu, Feb 11, 2010 at 9:32 AM, hjebbers hjebb...@gmail.com wrote: To all, I am running an EDI translator, and doing stress tests. When processing a test with a (relatively) big EDI file(s) on windowsXP I get a crash: 'sorry for the inconvenience' etc (so no clues about what is causing the problem) You need to give us more information if we're going to be able to help. At the very least, you'll need to copy paste the actual error message. It would be even better if you could show us some of your code, and better yet if you could give us a small bit of code that is self contained and reproduces the problem you're experiencing. -- Jerry the error is a windows thing, I can make a screenshot of it, but I can not copy/paste text. how do I upload a png-file? problem is that the same error happens over and over (I can reproduce it), but not at the same place (the is a logging in the application so that is quite easy to see.) but I can show you my code. it's an open source EDI application. but it is not a small bit of code I am more than will to show you how to reproduce the error. kind regards, henk-jan -- http://mail.python.org/mailman/listinfo/python-list
Re: python crash on windows but not on linux
On Feb 11, 8:42 pm, Jerry Hill malaclyp...@gmail.com wrote: On Thu, Feb 11, 2010 at 9:32 AM, hjebbers hjebb...@gmail.com wrote: To all, I am running an EDI translator, and doing stress tests. When processing a test with a (relatively) big EDI file(s) on windowsXP I get a crash: 'sorry for the inconvenience' etc (so no clues about what is causing the problem) You need to give us more information if we're going to be able to help. At the very least, you'll need to copy paste the actual error message. It would be even better if you could show us some of your code, and better yet if you could give us a small bit of code that is self contained and reproduces the problem you're experiencing. -- Jerry the error is a windows thing, I can make a screenshot of it, but I can not copy/paste text. how do I upload a png-file? problem is that the same error happens over and over (I can reproduce it), but not at the same place (the is a logging in the application so that is quite easy to see.) but I can show you my code. it's an open source EDI application. but it is not a small bit of code I am more than will to show you how to reproduce the error. kind regards, henk-jan -- http://mail.python.org/mailman/listinfo/python-list
Re: Bizarre arithmetic results
On 2/11/2010 11:23 AM, Jussi Piitulainen wrote: Robert Kern writes: On 2010-02-11 06:31 AM, Shashwat Anand wrote: There is a little issue here that ' -.1 ** .1' should give you error message. That is it. No, fractional powers of negative numbers are perfectly valid mathematically. The result is a complex number. In Python 3 (what the OP is using), this has been implemented, but not in Python 2.6. Perhaps it should raise a MisleadingSpacingError at compile time. You forgot the smiley ;-). The error message could recommend - .1**.1, or better -(.1 ** .1). The compiler would never see the difference between -.1 ** .1 and the first and probably no difference with the second either. -- http://mail.python.org/mailman/listinfo/python-list
Re: python crash on windows but not on linux
On Feb 11, 2:39 pm, hjebbers hjebb...@gmail.com wrote: On Feb 11, 8:42 pm, Jerry Hill malaclyp...@gmail.com wrote: On Thu, Feb 11, 2010 at 9:32 AM, hjebbers hjebb...@gmail.com wrote: To all, I am running an EDI translator, and doing stress tests. When processing a test with a (relatively) big EDI file(s) on windowsXP I get a crash: 'sorry for the inconvenience' etc (so no clues about what is causing the problem) You need to give us more information if we're going to be able to help. At the very least, you'll need to copy paste the actual error message. It would be even better if you could show us some of your code, and better yet if you could give us a small bit of code that is self contained and reproduces the problem you're experiencing. -- Jerry the error is a windows thing, I can make a screenshot of it, but I can not copy/paste text. how do I upload a png-file? problem is that the same error happens over and over (I can reproduce it), but not at the same place (the is a logging in the application so that is quite easy to see.) but I can show you my code. it's an open source EDI application. but it is not a small bit of code I am more than will to show you how to reproduce the error. People coming here ask for help will vary in the amount of detail given, but I've rarely seen anyone as reluctant as you. It's like walking into an auto repair shop and asking the mechanic what's wrong with your car by trying to imitate the noise it makes. If your code is very largre, you're not going to get out of this without doing some of your own legwork. I'm sorry. Do this: Take your code, make a copy of it. Start removing code from the copy (in a controlled way) until the problem disappears. When you remove code don't worry about whether it produces anything useful, the object is to try to identify what's causing the error. Whatever code you removed when the error disappears should give you a clue what's causing it. Then, if need be, you can come back and post details. If you manage to get the program to a small size without eliminating the problem, you can post it here. Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
Re: python crash on windows but not on linux
On 2/11/2010 9:32 AM, hjebbers wrote: To all, I am running an EDI translator, and doing stress tests. When processing a test with a (relatively) big EDI file(s) on windowsXP I get a crash: 'sorry for the inconvenience' etc (so no clues about what is causing the problem) This happens with python 2.4, 2.5, 2.6 It does not happen in the same setuptests on linux. (while the linux machine has only half of the RAM of the windows machine). I am quite sure it is not some external module; there's no GUI (apart from 'print'), no network connections. Actually, the crash is not predictablethe crash occurs most of the time...but at different points. So basically I am wondering how to proceed. Is it related to a memory problem? (which does not occur on Linux) any pointer is very welcome, Are you using a 3rd-party extension (compiled-C) module? If so, I would suspect something platform specific in that. -- http://mail.python.org/mailman/listinfo/python-list
Re: python crash on windows but not on linux
On 2/11/2010 6:32 AM hjebbers said... To all, I am running an EDI translator, ... let's say bots :) and doing stress tests. When processing a test with a (relatively) big EDI file(s) on windowsXP I get a crash: 'sorry for the inconvenience' etc (so no clues about what is causing the problem) ... and it's running directly under python... I use textpad. It allows me to launch a script from a command window under its control, which when python subsequently crashes, commonly leaves the traceback in the textpad launched command window. Perhaps that'll help? Emile --also on the bots list and will be digging in seriously over the next several weeks This happens with python 2.4, 2.5, 2.6 It does not happen in the same setuptests on linux. (while the linux machine has only half of the RAM of the windows machine). I am quite sure it is not some external module; there's no GUI (apart from 'print'), no network connections. Actually, the crash is not predictablethe crash occurs most of the time...but at different points. So basically I am wondering how to proceed. Is it related to a memory problem? (which does not occur on Linux) any pointer is very welcome, henk-jan -- http://mail.python.org/mailman/listinfo/python-list
Re: python and http POST
On 2/11/2010 2:11 PM, galileo228 wrote:
Hey All,
Been teaching myself Python for a few weeks, and am trying to write a
program that will go to a url, enter a string in one of the search
fields, submit the search, and return the contents of the search
result.
I'm using httplib2.
My two particular questions:
1) When I set my 'body' var, (i.e. 'body = {'query':'search_term'}),
how do I know what the particular key should be? In other words, how
do I tell python which form on the web page I'm visiting I'd like to
fill in? Do I simply go to the webpage itself and look at the html
source? But if that's the case, which tag tells me the name of the
key?
2) Even once python fills in the form properly, how can I tell it to
'submit' the search?
This
http://groups.csail.mit.edu/uid/sikuli/
*might* help you.
--
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Re: Is a merge interval function available?
On Feb 12, 8:03 am, Jonathan Gardner jgard...@jonathangardner.net
wrote:
On Feb 10, 3:23 pm, Peng Yu pengyu...@gmail.com wrote:
I'm wondering there is already a function in python library that can
merge intervals. For example, if I have the following intervals ('['
and ']' means closed interval as
inhttp://en.wikipedia.org/wiki/Interval_(mathematics)#Excluding_the_end...)
[1, 3]
[2, 9]
[10,13]
[11,12]
I want to get the following merged intervals.
[1,9]
[10,13]
Could somebody let me know if there is a function in the python
library?
I vaguely recall a similar question a long time ago. Peng, is this a
homework assignment?
Perhaps we should add a standard module called homework. It can have
functions for all the different homework assignments we see on
c.l.python. We can simply point people to this module and then can
include the code in their answers.
Good idea - that would (also) give the teachers a convenient place to
check for what assignments have been solved by this list so they can
propose something else.
They can also grade the submissions against the code kept in this area
- exact copies could receive an F (for example :-))
Peter
--
http://mail.python.org/mailman/listinfo/python-list
Re: Need debugging knowhow for my creeping Unicodephobia
On 2/11/2010 4:43 PM, mk wrote: Neat, except that the process of porting most projects and external libraries to P3 seems to be, how should I put it, standing still? What is important are the libraries, so more new projects can start in 3.x. There is a slow trickly of 3.x support announcements. But maybe I'm whining. Or perhaps explaining why 3.x unicode improvements are needed. tjr -- http://mail.python.org/mailman/listinfo/python-list
Re: MODULE FOR I, P FRAME
On Thu, 11 Feb 2010 19:31:52 -, DANNY danijel.gv...@gmail.com wrote: Hello! I am currently developing a simple video player in python, and my problem is that i can't find a module which has a function that can determine if frame(image) is I or P coded (MPEG coding). I have been using PIL but I couldnt find anything that could help me with that problem. How are you reading the video? PIL doesn't claim to do more than identify MPEG files. Also, which MPEG encoding, in which container format? If you aren't just putting a wrapper around something like ffmpeg, I rather suspect you'll have to decode the bitstream yourself. That could be rather painful if you're talking about MPEG-4/10. -- Rhodri James *-* Wildebeeste Herder to the Masses -- http://mail.python.org/mailman/listinfo/python-list
Please help with MemoryError
I have been using Python for several years now and have never run into memory errors… until now. My Python program now consumes over 2 GB of memory and then I get a MemoryError. I know I am reading lots of files into memory, but not 2GB worth. I thought I didn't have to worry about memory allocation in Python because of the garbage collector. On this note I have a few questions. FYI I am using Python 2.6.4 on my Mac. 1.When I pass a variable to the constructor of a class does it copy that variable or is it just a reference/pointer? I was under the impression that it was just a pointer to the data. 2.When do I need to manually allocate/deallocate memory and when can I trust Python to take care of it? 3.Any good practice suggestions? Thanks, Jeremy -- http://mail.python.org/mailman/listinfo/python-list
Re: Function attributes
En Thu, 11 Feb 2010 00:25:00 -0300, Terry Reedy tjre...@udel.edu escribió: On 2/10/2010 4:49 PM, Gabriel Genellina wrote: I've written a decorator for injecting a __function__ name into the function namespace, but I can't find it anywhere. I think I implemented it by adding a fake additional argument and replacing LOAD_GLOBAL with LOAD_NAME in the bytecode. The decorator only needs to replace the defaults args tuple. It does not even need to know the parameter name, just that it is the only (or last) with a default . def f(n, me=None): if n 0: return n*me(n-1) elif n==0: return 1 f.__defaults__ = (f,) # 3.1 print(f(5)) This is simple to implement, but requires changing the function definition. My goal was to keep the original code unchanged, that is, leave it as: def f(n): if n 0: return n*f(n-1) elif n==0: return 1 (like a normal, recursive function), and make the 'f' inside the function body magically refer to the function itself. Of course, user could still screw up recursion by providing another value for 'me'. This strikes me as about a likely (low) as a user screwing up recursion in a library module function by rebinding the name in the imported module. Well, if people really want to shoot themselves in the foot, there's nothing we can do to avoid that... -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Please help with MemoryError
On Thu, Feb 11, 2010 at 3:39 PM, Jeremy jlcon...@gmail.com wrote: My Python program now consumes over 2 GB of memory and then I get a MemoryError. I know I am reading lots of files into memory, but not 2GB worth. I thought I didn't have to worry about memory allocation in Python because of the garbage collector. On this note I have a few questions. FYI I am using Python 2.6.4 on my Mac. Is this pure-python, or are you using extension modules? Its possible a C extension has a memory leak. Its also possible you're keeping references to objects far longer then you need. 1.When I pass a variable to the constructor of a class does it copy that variable or is it just a reference/pointer? I was under the impression that it was just a pointer to the data. The question doesn't precisely make sense in terms of Python, but I think I see what you're getting at. Python doesn't implicitly copy anything: you have to explicitly copy an object to end up with two of them. That said, it sort of depends on what you're doing. When you pass objects into a class, if that class stores a reference to those objects, they'll live as long as the class does. More details would require you showing some examples of what you're doing. 2.When do I need to manually allocate/deallocate memory and when can I trust Python to take care of it? Generally, you can trust Python-- and you can't manually allocate/deallocate even if you wanted to. If you're suffering a memory leak, it almost certainly comes from one of two places: 1. Your code is keeping references somewhere to objects that you don't need anymore, or 2. Some C extension you are using has some ref-counting bugs. Once upon a time, reference cycles would also cause memory leaks, but the cyclic GC breaks them now. 3.Any good practice suggestions? Look over your code: look at places where you bind objects to any names that aren't local. Look for lists or dictionaries that you're putting stuff into without really meaning to keep it forever, and maybe you aren't purging. Global vars are worth a close look too. This may be useful: http://www.lshift.net/blog/2008/11/14/tracing-python-memory-leaks --S -- http://mail.python.org/mailman/listinfo/python-list
