🌐 Mailman 3 December 2001 - Python-list - python.org

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Dec. 1, 2001

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sending ctrl-break signal or ctrl-c
by sshark97＠hotmail.com Dec. 1, 2001

Dec. 1, 2001

hi, i have used os.spawn*(...) to execute a windows application and want to programatically terminate this application using ctrl-C or ctrl-break . how do i that? or is there any windows specific python-API i should condider? thanks. /lim/

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MIT AI Mailing List
by Ron Stephens Dec. 1, 2001

Dec. 1, 2001

http://www.ai.mit.edu/~gregs/ll1-discuss-archive-html/threads.html The above is a link to recent archives of an MIT mailing list that I got on recently because of attending the LLL conference. I am finding it to be most interesting. Among many other things, Jeremy Hylton is participating in a thread discussing technical issues which were brought to his attention by academics at the conference having to do with garbage collection and other things. There is mostly though discussion on newer, more experimental academic languages, as well as Scheme, Lisp, Ruby, etc. etc. etc. The mailing list can be subscribed to as below::: LL1-Discuss(a)ai.mit.edu Mailing List There is a mailing list for continuing discussions started at the workshop. To subscribe, send mail to majordomo(a)ai.mit.edu with the command subscribe ll1-discuss in the body. For more help, send mail to majordomo(a)ai.mit.edu with the command help in the body, or send mail to owner-ll1-discuss(a)ai.mit.edu . Archives of the ll1-discuss list are available. ________ I hope some of you will enjoy this academic maling list as I do, even if some of it is above my head. Ron Stephens http://www.awaretek.com/plf Python web site for newbies and unregenerate code hackers, just for fun...

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Re: Database in a simple ascii file
by Don Arnold Dec. 1, 2001

Dec. 1, 2001

On 30-Nov-2001, Lucio Torre <lucio(a)movilogic.com> wrote: > Steve Holden wrote: > > >"Rafael Mentz Aquino" <pythonlist(a)zumnet.com.br> wrote ... > > > >>Hi, > >> > >>How many lines can I have in a simple ascii file before > >>I start to loose performance when I open this file and > >>put all the lines in a dict, turning the first column into the key > >>and the rest of the line into a list associated to that key. > >> > >>(my file has just 100 lines, but that question starts to bother me ;-) > >> > >You couls always do some testing ... > > > >In fact this is probably the fastest way to do it, for random keys and a > >file that will fit comfortably into memory. The dictionary implementation > >works hard to make sure that access time is roughly constant no matter > >what > >the size. > > > >Posters have in the past reported using dictionaries of 100,000 elements > >without problems, so your file has to grow some before you hit uncharted > >territory... > > > >regards > > Steve > >-- > >http://www.holdenweb.com/ > > > > I think that ZODB will allow you to have a dictionary bigger than your > memory. Is that so? Anyone tried it? Can't you accomplish this using the shelve module, more or less?

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Design tips requested for OOP forum system (using pickle)
by cs1spw＠bath.ac.uk Dec. 1, 2001

Dec. 1, 2001

I'm something of a Python newbie but I'm keen to learn so I've decided to throw myself in at the deep end. My objective is to "learn" python (or at least get to a stage where I feel confident writing larger applications in it) and at the same time get the hang of object orientated design for a "real" software system (I've been slowly learning OOP over the last few months and I'm itching to try it out). Anyway - I've decided to code a flat threaded web forum system (similar to UBB or vBulletin) in Python using pickled objects in flat files to store the data (rather than using a database or a delimited flat file format of some sort). I'm doing this primarily as a learning exercise, so performance and scalability aren't that important. I'm having trouble figuring out the best way to design the classes for the forum. Here's what I have so far: User - an object representing a single forum user account Forum - an object representing a forum (e.g "General Chat" or "Site Suggestions") Thread - an object representing a thread Post - an object representing an actual post In addition I'm keen on having Moderator and Admin classes which extend User and are used for forum accounts with extra ablities. Post objects will be held in an array within a Thread object (representing the thread the posts were posted on). Thread objects will be held in an array within a Forum object. One thing I haven't quite figured out yet is how to relate posts to the user object for the user that posted that post. Should I look at storing some kind of user ID and then searching through my user objects for an object with that ID stored within it every time I display a post? That sounds horribly inefficient - performance is not a major concern for this software as it's intended for personal small scale use but I don't want to write something that's virtually unusable due to performance problems... I'm also not entirely sure how to do things like ordering posts witin threads by date - should I ensure they are in order within the array or sort the objects by their date property (which I assume will require me to write my own ordering algorithm, presumably not hard but something I've never had to do before). My final problem (I think) is how to split pickled data up. Should I have an OverallForum object which contains ALL the objects (and data) within it and pickle/unpickle the whole thing for every page view (sounds inefficient) or pickle individual forums in their own files. If I store individual forums in their own file how will I maintain references to User objects possibly pickled elsewhere? Any tips / pointers / warnings that I'm going about this project completely the wrong way would be more than welcome :) Thanks, Simon

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Re: The Ideals of a Python Hacker (was: Poll Results)
by Bill Bell Dec. 1, 2001

Dec. 1, 2001

Jonathan Gardner <jgardn(a)alumni.washington.edu> wrote, in part: > [Python] really *is* easier, it really *is* useful, and it really > *is* debuggable, so why would you want to use C++ when you have > Python? Amen! > They'd have to be [young]. I can't seem to find a place to get paid to work in > Python yet. I can't imagine a guy with 3 kids trying to make a living > by programming python unless he is the rare guy that has a job in it. AHEM! I may be a statistical anomaly but I'm almost 55. I now have two paying Python projects on the go. True, one is funded by a university. However, the other one is for a purely commercial play. The president of the company, like me, is a some breed of anarchist. I plan to use Python to introduce some of the students in the one and only MBA course that I do to concepts like threads and sockets this winter. (The code is a lot easier to understand than equivalents in most other languages.) And I believe I've influenced at least one guy aged around 20 to take up this fantastic language. (He might even be reading this when he is supposed to be doing his schoolwork.) It's amazing what one can do when one sits in front of a screen and rests one's canes against a bookcase. :o) Peace and bliss, eh. Bill "It is the time that you have wasted for your rose that makes your rose so important."--St-Exupery

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