🌐 Mailman 3 August 2012 - Python-list - python.org

Re: Eclipse and the Python plugin
by lipska the kat Aug. 3, 2012

Aug. 3, 2012

On 03/08/12 13:10, Mark Lawrence wrote: > On 03/08/2012 12:34, lipska the kat wrote: >> A while ago someone asked me what I thought of the Eclipse plugin for >> python, snip >> > > My opinion of Eclipse is unchanged by your words, it's like trying to > run a legless carthorse in the Grand National or the Derby. :-)) There's this image in my mind ... jeez, get a grip. I'm sorry to hear that, what would you recommend. lipska -- Lipska the Kat: Troll hunter, sandbox destroyer and farscape dreamer of Aeryn Sun

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Re: Is Python a commercial proposition ?
by lipska the kat Aug. 3, 2012

Aug. 3, 2012

On 01/08/12 09:06, Mark Lawrence wrote: > On 01/08/2012 00:31, David wrote: >> On 01/08/2012, lipska the kat <lipska(a)yahoo.co.uk> wrote: >>> On 31/07/12 14:52, David wrote: >>>> >>>> [1] as in beer >>>> [2] for research purposes >>> >>> There's one (as in 1 above) in the pump for you. >> >> Great, more beer => better research => \o/\o/\o/ >> But, "pump" sounds a bit extreme .. I usually sip contentedly from a >> glass :p >> > > You complete ignoramus, if it gets poured in advance that's no good to > anybody as it'll go flat. Has to stay in the pump until you're ready to > drink it from the glass. Don't you know anything about the importance of > process and timing? :) > Heh heh, obviously never got drunk ... er I mean served behind the bar at uni/college/pub %-} lipska -- Lipska the Kat: Troll hunter, sandbox destroyer and farscape dreamer of Aeryn Sun

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The way to develope a graphical application to manage a Postgres database
by Csanyi Pal Aug. 2, 2012

Aug. 2, 2012

Hi, I'm new to python. I'm searching for a way to develope a Python graphical application for a Postgresql database. I have installed on my Debian GNU/Linux testing/sid system many python packages, among others: eric, geany, idle, ninja-ide, pida (it doesn't work here), python2.7, python-easygui, python-forgetsql, python-gasp, python-glade2, python-gobject-2, python-gtk2, python-pip, python-pygresql, python-pyside.qtsql, python-subversion, python-tk, python-wxglade, spyder, python3-psycopg2, python-psycopg2, XRCed. I did search in the Google but can't find any good tutorial except for wxpython tutorial: http://wiki.wxpython.org/FrontPage, wxGlade tutorial: http://wiki.wxpython.org/WxGladeTutorial There is a tutorial for using python-psycopg2 here: http://wiki.postgresql.org/wiki/Psycopg2_Tutorial Still I don't know how to put these all together? XRCed is the most interesting way for me. Can one advices me where to go? -- Regards from Pal

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Re: The way to develope a graphical application to manage a Postgres database
by Csanyi Pal Aug. 2, 2012

Aug. 2, 2012

Dennis Lee Bieber <wlfraed(a)ix.netcom.com> writes: > On Thu, 02 Aug 2012 20:24:36 +0200, Csanyi Pal <csanyipal(a)gmail.com> > declaimed the following in gmane.comp.python.general: >> >> I'm searching for a way to develope a Python graphical application for a >> Postgresql database. >> > A predefined database, or a general access module? A predefined, already existing database. >> I have installed on my Debian GNU/Linux testing/sid system many python >> packages, among others: >> eric, geany, idle, ninja-ide, pida (it doesn't work here), python2.7, >> python-easygui, python-forgetsql, python-gasp, python-glade2, >> python-gobject-2, python-gtk2, python-pip, python-pygresql, >> python-pyside.qtsql, python-subversion, python-tk, python-wxglade, >> spyder, python3-psycopg2, python-psycopg2, XRCed. >> > Well... I'd suggest figuring out which GUI toolkit you want to > use... You have GTK, Tk, I'd say Wx but you didn't list wxpython. You > also have two competing PostgreSQL adapters -- pick one... I just installed wxpython packages: wx2.8-i18n, python-wxgtk2.8, python-wxtools. > Eric, geany, and idle are all editor/development environments and > not directly related to what the application itself runs. > > For a predefined database, you may just want to explore Dabo. For a > general access (eg; one where you tell the program which PostgreSQL > database to connect to, and it extracts the schema information from the > database at run-time) you'll need to study the advanced features of the > database engine and adapter. I'm exploring now Dabo. -- Regards from Pal

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Creating a simple CGI Script
by Smaran Harihar Aug. 2, 2012

Aug. 2, 2012

Hi, I am trying to create a simple CGI Script and following this tutorials<http://pointlessprogramming.wordpress.com/2011/02/13/python-cgi-tutorial-1/>but unfortunately my output is only printing the cgi file as it is on the browser. I have already provided the py scripts with the executable functions. This is my server.py <http://dpaste.de/iEPTk/> and this is my test_cgi.py<http://dpaste.de/7SsAj/> -- Thanks & Regards Smaran Harihar

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Re: Pass data to a subprocess
by Grant Edwards Aug. 2, 2012

Aug. 2, 2012

On 2012-08-02, Laszlo Nagy <gandalf(a)shopzeus.com> wrote: > >> I still don't get it. shm_unlink() works the same way unlink() does. >> The resource itself doesn't cease to exist until all open file >> handles are closed. From the shm_unlink() man page on Linux: >> >> The operation of shm_unlink() is analogous to unlink(2): it >> removes a shared memory object name, and, once all processes >> have unmapped the object, de-allocates and destroys the >> contents of the associated memory region. After a successful >> shm_unlink(), attempts to shm_open() an object with the same >> name will fail (unless O_CREAT was specified, in which case a >> new, distinct object is created). >> >> Even if the parent calls shm_unlink(), the shared-memory resource >> will continue to exist (and be usable) until all processes that are >> holding open file handles unmap/close them. So not only will >> detached children not crash, they'll still be able to use the shared >> memory objects to talk to each other. Note that when I say the detached children will still be able to talk to each other using shared memory after the parent calls shm_unlink() and exit(), I'm talking about the general case -- not specifically about the multiprocessing module. There may be something else going on with the multiprocessing module. > I stand corrected. It should still be examined, what kind shared > memory is used under non-linux systems. System V on AIX? And what > about Windows? So maybe the general answer is still no. But I guess > that the OP wanted this to work on a specific system. > > Dear Andrea Crotti! Please try to detach two child processes, exit > from the main process, and communicate over a multiprocessing queue. > It will possibly work. Sorry for my bad advice. I'm not claiming it will work, since I don't know how the IPC in the multiprocessing module works. It may indeed break when a child process is detatched (which I'm assuming means being removed from the process group and/or detached from the controlling tty). But, I'm not aware of any underlying Unix IPC mechanism that breaks when a child is detached, so I was curious about what would cause multiprocessing's IPC to break. -- Grant Edwards grant.b.edwards Yow! I didn't order any at WOO-WOO ... Maybe a YUBBA gmail.com ... But no WOO-WOO!

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Re: Error help
by danielashiloh＠googlemail.com Aug. 2, 2012

Aug. 2, 2012

On Thursday, 2 August 2012 12:18:59 UTC+1, Peter Otten wrote: > danielashiloh(a)googlemail.com wrote: > > > > > This error has been bugging me for days. I know it's minor, but it's > > > really getting in the way of my programming. I'm programming a data > > > analysis programme for a psychology experiment which takes pickled data > > > from the experiment and produces averages. For some reason python is > > > insisting there is an indentation error on line 18. > > > > I can't confirm that, I get an error in line 8 > > > > > partifipant_info=data'Participant Info'] > > > > where you forgot the opening '['. > > > > Please post your actual code and don't forget to include a cut-and-paste > > version of the traceback you get. Thank you, everyone, for the replies. It does seem to stem from that missing bracket, indeed the error did start coming up when I first included that line. Do I feel silly! Incidentally, the error message I got was for an unexpected indent. All is resolved now.

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consistent input() for Python 2 and 3
by Ulrich Eckhardt Aug. 2, 2012

Aug. 2, 2012

Hi! I'm trying to write some code that should work with both Python 2 and 3. One of the problems there is that the input() function has different meanings, I just need the raw_input() behaviour of Python 2. My approach is to simply do this: try: # redirect input() to raw_input() like Python 3 input = raw_input except NameError: # no raw input, probably running Python 3 already pass What do you think? Any better alternatives? Uli

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Error help
by danielashiloh＠googlemail.com Aug. 2, 2012

Aug. 2, 2012

Hi all This error has been bugging me for days. I know it's minor, but it's really getting in the way of my programming. I'm programming a data analysis programme for a psychology experiment which takes pickled data from the experiment and produces averages. For some reason python is insisting there is an indentation error on line 18. I have untabified and retabified and nothing seems to work. Here is the full code: import cPickle, pickle print 'WELLCOME TO THE LIBET CLOCK EXPERIMENT DATA ANALYSIST' file=raw_input('\nPLEASE ENTER THE NAME OF THE FILE YOU WISH TO ANALYSE: ') pickle_file=open(file, 'r') data=cPickle.load(pickle_file) file_name=file-'pck' + 'txt' partifipant_info=data'Participant Info'] first_block_data=data['First block data'] second_block_data=data['Second block data'] first_block_estimates=first_block_data['Estimated times'] first_block_times=first_block_data['Actual times'] second_block_estimates=second_block_data['Estimated times'] second_block_times=second_block_data['Actual times'] def firstBlockDifferences(): print '\nCALCULATING AVERAGE DIFFERENCES FOR BLOCK 1' count=0 first_block_differences=[] total=0 while count<len(first_block_estimates): differences=float(first_block_estimates[count])-float(first_block_times[count]) if differences >= 180: differences-=360 elif differences <=-180: differences+=360 total+=differences differences=[differences] first_block_differences+=differences count+=1 average_diff_first_block=total/len(first_block_estimates) text_file.write('\nAverage differences for block 1: ', average_diff_first_block) def secondBlockDifferences(): print '\nCALCULATING AVERAGE DIFFERENCES FOR BLOCK 2' count=0 second_block_differences=[] total=0 while count<len(second_block_estimates): differences=float(second_block_estimates[count])-float(second_block_times[count]) if differences >= 180: differences-=360 elif differences <=-180: differences+=360 total+=differences differences=[differences] second_block_differences+=differences count+=1 average_diff_second_block=total/len(second_block_estimates) text_file.write('\nAverage differences for block 2: ', average_diff_second_block) text_file=open(file_name, 'w') text_file.write('\nParticipant info: ', participant_info) firstBlockDifferences() secondBlockDifferences() I apologise for the lack of annotation and it may be a little inefficient, but I am really only after a solution to the error on line 18. Thanks.

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Re: CRC-checksum failed in gzip
by Steven D'Aprano Aug. 2, 2012

Aug. 2, 2012

On Wed, 01 Aug 2012 14:01:45 +0100, andrea crotti wrote: > Full traceback: > > Exception in thread Thread-8: "DANGER DANGER DANGER WILL ROBINSON!!!" Why didn't you say that there were threads involved? That puts a completely different perspective on the problem. I *was* going to write back and say that you probably had either file system corruption, or network errors. But now that I can see that you have threads, I will revise that and say that you probably have a bug in your thread handling code. I must say, Andrea, your initial post asking for help was EXTREMELY misleading. You over-simplified the problem to the point that it no longer has any connection to the reality of the code you are running. Please don't send us on wild goose chases after bugs in code that you aren't actually running. > there seems to be no clear pattern and just randmoly fails. When you start using threads, you have to expect these sorts of intermittent bugs unless you are very careful. My guess is that you have a bug where two threads read from the same file at the same time. Since each read shares state (the position of the file pointer), you're going to get corruption. Because it depends on timing details of which threads do what at exactly which microsecond, the effect might as well be random. Example: suppose the file contains three blocks A B and C, and a checksum. Thread 8 starts reading the file, and gets block A and B. Then thread 2 starts reading it as well, and gets half of block C. Thread 8 gets the rest of block C, calculates the checksum, and it doesn't match. I recommend that you run a file system check on the remote disk. If it passes, you can eliminate file system corruption. Also, run some network diagnostics, to eliminate corruption introduced in the network layer. But I expect that you won't find anything there, and the problem is a simple thread bug. Simple, but really, really hard to find. Good luck. -- Steven

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