🌐 Mailman 3 September 2005 - Tutor - python.org

Postgresql+Python -tutorial?
by Olli Rajala Feb. 11, 2006

Feb. 11, 2006

Hi! I've been using MySQL up this day, but would like to convert my program to use Postgresql. There seems to be awful lots of tutorials for MySQL+Python, but not so many for Postgresql+Python. Where should I start? I'm not very good at database things, but have written some little programs with MySQL+Python/Php/Java. So, if you have some good tutorials or something else info, I'd be glad to know! Oh, I can install additional modules, but it would be great if Ubuntu had them... Thanks! -- Olli Rajala <>< Tampere, Finland http://www.students.tut.fi/~rajala37/ "In theory, Theory and Practice should be the same. But in practice, they aren't." - Murphy's Proverbs

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What does Python gain by having immutable types?
by Tony C Nov. 14, 2005

Nov. 14, 2005

A friend recently asked my this didn't modify his original string variable s1="this is a string" s1.replace("is a", "is a short") "this is a short string" print s1 "this is a string" After showing him to change it to this s1 = s1.replace("is a", "is a short") print s1 "this is a short string" He then asked Why is it that the sort operation modfies the original list variable? l1=[] l1.append(3) l1.append(44) l1.append(1) l1.append(22) l1 [3, 44, 1, 22] l1.sort() l1 [1, 3, 22, 44] I don't know, but I think it has something to do with strings being immutable, whiles lists are mutable. So, other than the non-informative answer " because that's how the language was written" are there any other reasons how Python benefits from immutable types? Does it really matter if s1 is a different object, so long as it contains the expected modified string? The list variable is the same object, and contains the sorted list, so why bother with the complexity of immutable types at all?

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Question about resetting values
by Nathan Pinno Nov. 11, 2005

Nov. 11, 2005

I am writing a Blackjack program, and was wondering how to reset the values to zero, e.g. cash = 0? Thanks, Nathan Pinno, Crew, Camrose McDonalds and owner/operator of Woffee

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Re: [Tutor] script question
by Kent Johnson Oct. 18, 2005

Oct. 18, 2005

Chris Hallman wrote: > > Thanks for all the input!!! I really appreciate it. I need to post a > correction to my script. What I sent was an early version. I made a few > minor modifications: You don't seem to have incorporated any of the suggestions that you have received! I doubt that a 4000-line ini file will be any problem at all. Kent > > import ConfigParser, string, sys, os > section = sys.argv[1] > interface = sys.argv[3] > INI=ConfigParser.ConfigParser() > INI.read("c:\utils\interfaces.ini") > interface_entries=[p for p in INI.options > (section)] > interface_list=[INI.get(section, pw) for pw in interface_entries] > for i in interface_list: > if i == interface: > os.system("d:\\tnd\\bin\\cawto.exe -cat NetNet -n l17aesm1 forward red held " + > sys.argv[1] + " " + sys.argv[2] + " " + sys.argv[3] + " " + sys.argv[4]) > > > I've researched what you all have suggested and I may need to switch to > reading the ini file line by line or using a different file parser. The > ini file is only 100 lines long now, but will likely grow to 500 line > and maybe to 4000 lines. To give you a better background of what I'm > doing with this script, it's running on a network management system that > receives traps. After some processing of the raw trap, messages get sent > to this script for further processing. These messages are for interface > down traps from routers and switches in our network. I use this script > to mitigate the number of interface down messages on our console. I need > to do this because we do not need to know when every port has gone down > (i.e. user ports). This script searches the ini file for a device name > match. Once it has found a match and if the interface matches as well, I > need to message forwarded to the console (the Windows command). If no > matching device or interface is found, then the script can just exit. > > > On 9/26/05, *Kent Johnson* <kent37(a)tds.net <mailto:kent37@tds.net>> wrote: > > Kent Johnson wrote: > > *TEST FIRST* Don't optimize until you know it is too slow and you > > have a test case that you can time to see if your 'optimizations' are > > making it faster. > > Pardon my shouting :-) > > Kent > > _______________________________________________ > Tutor maillist - Tutor(a)python.org <mailto:Tutor@python.org> > http://mail.python.org/mailman/listinfo/tutor > <http://mail.python.org/mailman/listinfo/tutor> > >

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Request for newbies :-)
by Michael Sparks Oct. 8, 2005

Oct. 8, 2005

[ This /may/ be very "off-netiquette" for the tutor list. If it is, I apologise in advance. ] Hi, One of the aims of the project I'm working on is that it aims to make writing programs which are inherently (and potentially) highly parallel/concurrent easy & safe to work with. We've tested our hypothesis so far with a pre-university trainee who had very little programming experience before joining our team (a little bit of visual basic, some Access). During his time with us he learnt python during his first week, and did learnt our system in his second week. In the remainder of his time with us he wrote a highly parallel program that simulated a digital TV decoder - using a shakespeare script as the data source, and doing things like scene detection, and displayed the script & characters using pygame (which was handled by other parts of the system.) That was a side project (20% style project if you like) whereas his main project he implemented during his short time with us was a system for going through an mpeg video, and sending snapshots every few seconds to a client running on a mobile phone (using python and our system). (An application of this could be browsing PVR content on a mobile). We've since also had a vacation trainee (who's just completed 2 years of his course) join us, and in his 6 weeks with us he learnt python, our system, and despite no prior networking knowledge implemented a system for joining multicast islands together and adding in reliability on top. (A possible application of this is "broadcast" of news over the internet) It's worth noting that the first trainee had very little experience of programming, networks, mobiles and so on, and that the second had no real knowledge of python, networks, concurrency, etc. The approach we took for teaching the system was to get people to implement a simple version of the core of the system itself. (After getting them to work through "How to think like a computer scientist" the week before). This implementation was guied by a simple tutorial that is formulated as a series of guided exercises (Standing, Walking, Talking, Conversing), with a couple of interludes discussing the implications of the results of the exercise. As a result this is where I come to a request. If there is anyone out there who is willing to do the following tutorial/exercises, could they please do so at their own pace and when they've done them please get in touch? * http://kamaelia.sourceforge.net/MiniAxon/ If you want a holding hand, I'm often on #kamaelia on irc on freenode. In order to do the tutorial you need to understand the following concepts: * classes, methods, functions, if/elif/else, while, try..except, for..in.., generators (yield), lists, dictionaries, tuples. If you're not clear on generators, this might be a good way of understanding what you can do with them :-) Thanks in advance to anyone willing to give this a go, and to others for their patience regarding this message! Best Regards, Michael. -- Michael Sparks, Senior R&D Engineer, Digital Media Group Michael.Sparks(a)rd.bbc.co.uk, http://kamaelia.sourceforge.net/ British Broadcasting Corporation, Research and Development Kingswood Warren, Surrey KT20 6NP This e-mail may contain personal views which are not the views of the BBC.

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Re: [Tutor] Embedding
by Joseph Quigley Oct. 5, 2005

Oct. 5, 2005

Hi, Ok, I'll try to convince them to try python... but still, would it be best to just: Program in C with Python and Java scripts Program in Python with a little bit of C? The game we're trying to make is a Super Mario type game (or super tux for you like linux games). I suppose pygame would make it a breeze for video, sound and graphics! My only problem is I haven't done any games withy pygame at all and can't find any pygame tutorials (when I google). Thanks, Joe

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Python equiv to PHP "include" ?
by Jay Loden Oct. 4, 2005

Oct. 4, 2005

I've not been able to find an answer to this conundrum anywhere: My current website is done in PHP with a setup something like this: ::PHP TEMPLATE CODE:: include('file.htm') ::PHP TEMPLATE CODE:: This way, I can have PHP embedded in my htm files and it will be processed as part of the script. For example, I can have a form that's written in HTML and processed in PHP, then simply 'include("form.htm")' and I have a form with processing that's ALSO wrapped in my site template. I can't figure out how one would approach this in Python (i'm using mod_python). There's no equivalent to the "include" function from PHP. I can't use import because then Python would try to parse the HTML from the imported file. I've looked at stuff like cheetah and PSP, but neither of those actually answers the question, which is how can I include dynamic content including PHP code directly into an existing script. Even if I started using PSP, I still can't "include" a PSP page into the middle of another PSP page. I'm definitely willing to consider any other solution for how I can make a form that processes its input but maintains my template code wrapped around it, so feel free to point out a "Pythonic" method. I just don't want to duplicate the template code, and I can't find a nice neat solution like what I've got in PHP. -Jay

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HTTP GET Request
by Jerl Simpson Oct. 3, 2005

Oct. 3, 2005

Hello, I have been looking through some of the HTTP projects and haven't quite found what I'm looking for. Basicall, what I need is a stand alone CGI. Instead of the program passing the data off to a CGI, I want it to parse and handle the request directly. The part I'm having trouble with is actually getting the request and parsing it. Let's say I have a URI that looks like: ?var1=val1&var2=val2&...varn=valn I'd like to find a way to get these into some datastructure so I can use them to generate my output. It seems like a simple thing, but as I'm new to python, I don't know where to start. Thank you for any help you can give. Jerl

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More than one thing at a time?
by Joseph Quigley Oct. 1, 2005

Oct. 1, 2005

Hi, I've got a problem: I've got a semi working IRC client. There's a function that is for receiving and one for sending. How can I have a loop where I can receive messages, yet still have a send prompt? Thanks, Joe

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Re: [Tutor] Alan's responce frustrated beginner (fwd)
by Danny Yoo Sept. 30, 2005

Sept. 30, 2005

[Rosalee] >>> I want to save this file, import it and make the changes, eggs = >>> toast, . spam = jelly and change the values if needed. [Danny] >> It sounds like you're still stuck trying to input programs into Python. >> Are you using a "programming text editor"? If not, then you may want >> to look at: http://hkn.eecs.berkeley.edu/~dyoo/python/idle_intro/ [Rosalee] > Thanks for your help, you guys are great!!! Also, a blessing to > programming illerates like me!!! Hi Rosalee, I'm forwarding this to the other tutors here too. In general, in replies to Tutor messages, try to make sure to "Reply to All" with your email client. That way, the others can see your thanks. *grin* Anyway, I'm glad you found things out. Please feel free to continue to ask questions on Tutor!

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