🌐 Mailman 3 December 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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is there any tool like "run line or selection" in Pythonwin?
by linda.s Feb. 6, 2006

Feb. 6, 2006

is there any tool like "run line or selection" in Pythonwin? Thanks!

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Re: [Tutor] new to linux and I cannot find some python things
by Hans Dushanthakumar Jan. 2, 2006

Jan. 2, 2006

Anothet linux noobie here :) How do I uninstall python? I use the SimplyMepis flavor of linux. The reason I want to uninstall python is that its an old version (2.3). Not that I particularly want the new version, but the IDLE installation that I downloaded reports all kinds of errors because apparently its meant to work with python 2.4. -----Original Message----- From: tutor-bounces(a)python.org [mailto:tutor-bounces@python.org] On Behalf Of Brian van den Broek Sent: Thursday, 29 December 2005 12:58 p.m. To: Simon Gerber Cc: Tutor Subject: Re: [Tutor] new to linux and I cannot find some python things Simon Gerber said unto the world upon 28/12/05 05:12 PM: >>Hi all, >> >>I'm a week or so into having switched from WinXP to linux (ubuntu >>breezy). There is a lot to learn about the differences in the OS'es >>and that's just fine. > > > Excellent! Another Ubuntu Breezy user here. If there's anything Ubuntu > I can help you with, drop me an e-mail and I'll do what I can to help. Hi Simon, thanks for the reply and the offer :-) >>But, a couple of things have been in my way with Python. Most notably, >> I don't know how one browses the documentation. On Windows, I just >>fired up the .chm (I think cmh--at any rate, the compiled help file.) > > > Yeah, chm. Incidentally, there's a chm reader for Linux. Very > primative, but it works in a pinch. Look for 'xchm' in the Universe > repository. Thanks. A bit part of the difficulty in the transition is suddenly I don't know what program to use for what. Pointers help :-) > >>I have installed the docs on the linux side and they can be found by >>python: >> >> >>> help() >><snip welcome msg> >>help> NONE > > > Nah, that's part of core Python. Nothing to do with the 'python-doc' > package you installed. I beg to differ :-) Before I installed I got this: IDLE 1.1.2 >>> help() Welcome to Python 2.4! This is the online help utility. <snip basic interactive help instructions which include doing help topics for a list of available choices> help> topics Here is a list of available topics. Enter any topic name to get more help. ASSERTION DELETION LOOPING SEQUENCES <snip list> help> ASSERTION Sorry, topic and keyword documentation is not available because the Python HTML documentation files could not be found. If you have installed them, please set the environment variable PYTHONDOCS to indicate their location. On Debian GNU/{Linux,Hurd} systems you have to install the corresponding pythonX.Y-doc package, i.e. python2.3-doc. help> On windows, one has to download the html version of the documentation and point the PYDOCS (or something close) env. variable at them. On ubuntu, once I installed python2.4-doc, it worked as shown in my OP. (I did test by removing the python2.4-doc package to get the behaviour shown in this post, then reinstalling to get the original behaviour.) >>I assume there is some linux facility for documentation browsing that >>beats importing modules and accessing docstrings. I'd work it out >>eventually, but a timesaving pointer would be appreciated. > > > Firefox! > > file:///usr/share/doc/python2.4/html/index.html But shouldn't it be harder than that? :-) > The python-doc package is just an offline version of > http://www.python.org/doc/2.4.2/ > > You can also probably find a copy of the book 'Dive into Python' here: > file:///usr/share/doc/diveintopython/html/index.html > > I know Hoary installed it by default. Not sure about Breezy, since I > just did a dist-upgrade from Hoary. Yep, it was installed by default. I'd wondered where it lived. But, since I've the dead-tree version, I didn't get motivated enough to find out. Still, thanks. > As a rule, with Ubuntu (and most other Linux distros), the > documentation goes under /usr/share/doc/<whatever>. But you can always > check to see exactly what a package has put where. From the > command-line, just type 'dpkg -L python-doc'. > > Hope that helps, Thanks, it did. Especially that last bit. I've been learnign the various shell commands almost as quickly as I've been finding I want to know what command does foo. Thanks muchly, Brian vdB _______________________________________________ Tutor maillist - Tutor(a)python.org http://mail.python.org/mailman/listinfo/tutor

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Re: [Tutor] Extracting data from HTML files
by kevin7kal Dec. 31, 2005

Dec. 31, 2005

my 2 cents: I agree, BeutifulSoup is great for HTML parsing. It's a little weird and unintuitive at first, but once you get it, it's becomes quit an asset. >When you have time, do try going through a few examples with >BeautifulSoup. The web page there comes with some interesting examples, >and I don't think it's as bad as you might think. *grin* It's not >overkill: BeautifulSoup is explicitely designed to do the kind of data >extraction that you're doing right now. > >If you have questions about it, please feel free to ask. Best of wishes! > > > > >

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Multi-Dimensional Dictionary that contains a 12 element list.
by Paul Kraus Dec. 31, 2005

Dec. 31, 2005

I am trying to build a data structure that would be a dictionary of a dictionary of a list. In Perl I would build the structure like so $dictionary{key1}{key2}[0] = X I would iterate like so ... foreach my $key1 ( sort keys %dictionary ) { foreach my $key2 ( sort keys %{$dictionary{$key1}} ) { foreach my $element ( @{$dictionary{$key1}{$key2} } ) { print "$key1 => $key2 => $element\n"; } } } Sorry for the Perl reference but its the language I am coming from. I use data structures like this all the time. I don't always iterate them like this but If i can learn to build these and move through them in python then a good portion of the Perl apps I am using can be ported. Playing around I have come up with this but have no clue how to iterate over it or if its the best way. It seems "clunky" but it is most likely my lack of understanding. dictionary[(key1,key2)]=[ a,b,c,d,e,f,g ... ] This i think gives me a dictionary with two keys ( not sure how to doing anything usefull with it though) and a list. Now I am not sure how I can assign one element at a time to the list. here is the pseudo code. read text file. split line from text file into list of fields. One of the fields contains the date. Split the date into two fields Year and Month/Period. Build data structure that is a dictionary based on year, based on period, based on item code then store/increment the units sold based on period. dictionary[(year,period)] = [ jan, feb, mar, apr, may, jun, july, aug, sep, oct, nov ,dec] I would prefer to have the months just be an array index 0 through 11 and when it reads the file it increments the number contained there. TIA, -- Paul Kraus =-=-=-=-=-=-=-=-=-=-= PEL Supply Company Network Administrator 216.267.5775 Voice 216.267.6176 Fax www.pelsupply.com =-=-=-=-=-=-=-=-=-=-=

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SyntaxError while defining tuple : Guidance requested
by John Joseph Dec. 31, 2005

Dec. 31, 2005

Hi I am trying out learning python , using the book Python Programming for the absolute beginner by Michael Dawson I get File "page114.py", line 12 inventory = ("Sword","Armor","Shield","Healing Potion") ^ SyntaxError: invalid syntax when I run the program which I copied from the text , tried a lot to find the reason , I thought of sending it to the list , so that I get feed back on where I had gone worng ********************************************************** inventory() # treat the tuple as condition if not inventory: print "U are empty Handed." raw_input("\nPress the enter key to continue." #Create a tuple with some items inventory = ("Sword","Armor","Shield","Healing Potion") #print the tuple print "\n The Tuple inventory is: \n", inventory # print each element in the tuple print "\nYour Items:" for item in inventory: print item, ___________________________________________________________ To help you stay safe and secure online, we've developed the all new Yahoo! Security Centre. http://uk.security.yahoo.com

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Re: [Tutor] Extracting data from HTML files
by Kent Johnson Dec. 30, 2005

Dec. 30, 2005

motorolaguy(a)gmx.net wrote: > The HTML comes from a bunch of files which are saved in my computer.They > were generated by a php script and I want to extract certain fields for > insertion in to a MySQL db. > I`m trying to get the hang of correctly opening the files first :) > There are about a thousand of them so I have to use a loop in the script > since the files are named article1.html,article2.html,etc. > Thanks for the help! Try something like this: def process(data): # this is a function you define to process the data from one file maxFileIndex = ... # whatever the max count is for i in range(1, maxFileIndex+1): # i will take on each value # from 1 to maxFileIndex name = 'article%s.html' % i # make a file name f = open(name) # open the file and read its contents data = f.read() f.close() process(data) Kent PS Please reply to the list

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Re: [Tutor] Extracting data from HTML files
by Oswaldo Martinez Dec. 30, 2005

Dec. 30, 2005

> From: Danny Yoo <dyoo(a)hkn.eecs.berkeley.edu> > [...] > The Regular Expression HOWTO itself is pretty good and talks about some of > the stuff you've been running into, so here's a link to the base url that > you may want to look at: > > http://www.amk.ca/python/howto/regex/ Ah yes I`ve been reading that same doc and got confused on the use of the "r" I guess [......] > > I also found that on some of the strings I want to extract, when python > > reads them using file.read(), there are newline characters and other > > stuff that doesn`t show up in the actual html source. > > Not certain that I understand what you mean there. Can you show us? > read() should not adulterate the byte stream that comes out of your >files. >>> file = open("file1.html") >>> file.read() '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"\r\n"http://www.w3.org/TR/html4/loose.dtd">\r\n<html>\r\n<head>\r\n\r\n<script type="text/javascript">\r\n [...] That`s just a snippet from the html code.I`m guessing it won`t cause any problems since it`s just the newlines from reading the HTML code and not actually *in* the code. [...] > As an aside: the problems you're running into is very much why we > encourage folks not to process HTML with regular expressions: RE's also > come with their own somewhat-high learning curve. > > Good luck to you. Yes I`m seeing this right now hehe....but since all the files I have to process have the same structure (they were generated by a script) I think it might be easier to use RE`s here. Do you have any idea of what other tool I can use? I took a look at BeautifulSoup but it seemed a bit overkill and very much over my current python knowledge. Thanks! -- 10 GB Mailbox, 100 FreeSMS/Monat http://www.gmx.net/de/go/topmail +++ GMX - die erste Adresse f�r Mail, Message, More +++

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[OT] Python Tutor like java mailing list
by Guillermo Fernandez Castellanos Dec. 30, 2005

Dec. 30, 2005

Hi, After python I have to start learning Java. Do you know of any Tutor-like list for Java you could recommend? I've been looking and I've been unable to find any... and i miss it :-) Thanks, Guille

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identifier token parsing [was Re: (no subject)]
by w chun Dec. 29, 2005

Dec. 29, 2005

> hello everyone. i was looking at python docs and i came across this > > letter ::= > lowercase | uppercase > > what does ::= mean? you must be referring to identifiers and keywords page at http://docs.python.org/ref/identifiers.html take it as meaning, "may expand to." in other words, when you are trying to "parse" the language, meaning taking a look at the construct of a valid Python program with the following substitutions: identifier ::= (letter|"_") (letter | digit | "_")* letter ::= lowercase | uppercase lowercase ::= "a"..."z" uppercase ::= "A"..."Z" digit ::= "0"..."9" identifier expands to exactly one occurrence of (letter or _) followed by zero or more (*) occurrences of (letter or digit or _). so.... a variable such as 'testVar_123' matches the identifier token because it can be broken down in that fashion. for example, 't' is matched by letter -> lowercase -> 't' while 'estVar_123' is matched by zero or more occurrences of (letter or digit or _) --> (letter, letter, letter, letter, letter, letter, _, digit, digit, digit) -> lowercase, lowercase, lowercase, uppercase, lowercase, lowercase, _, '1', '2', '3') --> ('e', 's', 't', 'V', 'a', 'r', '_', '1', '2', '3'). you get the picture. hope this helps! -- wesley - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "Core Python Programming", Prentice Hall, (c)2006,2001 http://corepython.com wesley.j.chun :: wescpy-at-gmail.com cyberweb.consulting : silicon valley, ca http://cyberwebconsulting.com

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