🌐 Mailman 3 August 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. 15, 2005

Nov. 15, 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. 12, 2005

Nov. 12, 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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Website Retrieval Program
by Daniel Watkins Sept. 16, 2005

Sept. 16, 2005

I'm currently trying to write a script that will get all the files necessary for a webpage to display correctly, followed by all the intra-site pages and such forth, in order to try and retrieve one of the many sites I have got jumbled up on my webspace. After starting the writing, someone introduced me to wget, but I'm continuing this because it seems like fun (and that statement is the first step on a slippery slope :P). My script thus far reads: """ import re import urllib source = urllib.urlopen("http://www.aehof.org.uk/real_index2.html") next = re.findall('src=".*html"',source.read()) print next """ This returns the following: "['src="nothing_left.html"', 'src="testindex.html"', 'src="nothing_right.html"']" This is a good start (and it took me long enough! :P), but, ideally, the re would strip out the 'src=' as well. Does anybody with more re-fu than me know how I could do that? Incidentally, feel free to use that page as an example. In addition, I am aware that this will need to be adjusted and expanded later on, but it's a start. Thanks in advance, Dan

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Program to lock folders under win32
by Mark Kels Sept. 4, 2005

Sept. 4, 2005

Hi list. I want to make a program to lock folders (so the user can only access them if he knows the password) under win32, the only problem is that I have no idea how to start or what to do. Do you guys have any ideas of how to do it? Thanks! -- 1. The day Microsoft makes something that doesn't suck is probably the day they start making vacuum cleaners. 2. Unix is user friendly - it's just picky about it's friends. 3. Documentation is like sex: when it is good, it is very, very good. And when it is bad, it is better than nothing. - Dick Brandon

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Generate 8 digit random number
by Alberto Troiano Sept. 3, 2005

Sept. 3, 2005

Hey Tutors I saw a lot of responses...After analyze them I have resumed two approaches 1.- Generate a random number from 0 to 99999999 and fill this number with zeros (Almost everyone's approach) 2.- Generate 8 random numbers and join them (Pietro and someone else) Which one of this is more randomic? I mean which one of these has lower chances to get duplicates? Until now I'm using approach number 2.......Unless anyone has something against it... Please, let me know what do you think about them Thanks to all for the tremendous help (at least it is tremendous for me) Alberto

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Invoking bash from within a python program
by joe_schmoe Sept. 2, 2005

Sept. 2, 2005

Hi Pythoneers I'm sure that somewhere in the dim and distant past this was asked, but I'll be b***ered if I can find reference to it, and google searches haven't been too illuminating yet. Anyway, how do I call bash to run a program - e.g. slocate - from within a python program. I believe that I have to import the OS first (or do I?) and I was thinking something like: ... sh slocate file_name > python_defined_list ... This is to populate a list which would then become the filename list for the remove file command to iterate through sequentially and delete, as in: for i in python_defined_list: rm -fr i How the heck do I set that kind of interaction between bash and python and the user home directory content up? Any thoughts? /j

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PYTHON????
by luckygoodluck＠optonline.net Sept. 1, 2005

Sept. 1, 2005

Dear Python, How does a calculator multiply? I want to create a computer software that can multiply. How do I program the computer to multiply?

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Counting help
by Scott Oertel Sept. 1, 2005

Sept. 1, 2005

I have extracted a list of names, i.e. "Joe Smith" "Joe Smith" "Jack Smith" "Sam Love" "Joe Smith" I need to be able to count the occurances of these names and I really don't have any idea where to begin. Any ideas? excuse me this is my first post to this list, I hope I included enough information. -Scott Oertel

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Sort a Set
by Jonas Melian Aug. 31, 2005

Aug. 31, 2005

I get a list of repeated numbers [24, 24, 24, 16, 16, 15, 15 ] Is possible get it without repeated numbers, without using set()? If I use set, then the list is unsorted and i cann't sorting it. For get the values i use: [x[0] for x in cardTmp] or: from itertools import imap for i in imap(lambda x: x[0], cardTmp): print i A idea it would be create a generator that will return elements one by one, and then it would be possible know if that element is in the new list. But generators are in 2.4 Python 2.3.5

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