🌐 Mailman 3 January 2004 - Python-list - python.org

Re: HowTo Search in nested lists
by Rich Krauter Jan. 30, 2004

Jan. 30, 2004

I'm still learning too; this is how I would do it, but there are probably better ways: If you require the data structure to be lists, and the lists are relatively small, this approach is probably ok - it returns a list of tuples of indices where the value is found: Suppose you were trying to find the location of the value 5: a = [1,2,3] b = [4,5,6] c = [7,8,9] t = [a,b,c] >>> [(x,y) for (x,n) in enumerate(t) for y in range(len(n)) if n[y] == 5] [(1,1)] You can replace the 5 in the above expression with whatever you want to search for. If you need to do many look-ups, where you are asking "Does this value occur at any position in my array?", and the lists are very, very large, I would consider a different way using dicts instead of lists; looping through the lists every time you need to check if a value is present is not very efficient. Build up a dict out of the table, using tuples of indices as keys d = {} d[(0,0)] = 1 d[(1,0)] = 2 # etc # build up the "reverse" dict dd = {} for k,v in d.items(): dd.setdefault(v,[]).append(k) (You can just make dd{} directly from original table using some other method, without the intermediate step of making d{}; that step doesn't really provide any benefit to you, other than allowing you to build up dd{} using above snippet.) Then you can look up a table value using tuples of indices as keys to d{}. Also, you can check for membership and/or original index locations of a value by using it as a key to dd{}. The look-up should be much faster than the list comprehension method for very large lists. Rich __________________________________ Do you Yahoo!? Yahoo! SiteBuilder - Free web site building tool. Try it! http://webhosting.yahoo.com/ps/sb/

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Tcp/ip programs in python
by M.Dikmen Jan. 30, 2004

Jan. 30, 2004

Do you now a source about socket programming in python? or some source codes, demo programs? i really need them

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RE: PEP 327: Decimal Data Type
by Batista, Facundo Jan. 30, 2004

Jan. 30, 2004

Stephen Horne wrote: #- My concern is that many people will use a decimal type just #- because it #- is there, without any consideration of whether they actually need it. Speed considerations are raised. You'll *never* get the performance of using floats or ints (unless you have a coprocessor that handles this). #- I don't know what the solution should be, but I do think it needs to #- be considered. (In my dreams) I want to "float" to be decimal. Always. No more binary. Maybe in ten years the machines will be as fast as is needed to make this posible. Or it'll be implemented in hardware. Anyway, until then I'm happy having decimal floating point as a module. . Facundo

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Re: newbie py2exe difficulty
by Thomas Heller Jan. 30, 2004

Jan. 30, 2004

"Mike C. Fletcher" <mcfletch(a)rogers.com> writes: [a great detailed explanation how to run the py2exe setup script snipped] Mike, I took the freedom to enter this text in the py2exe wiki: <http://starship.python.net/crew/theller/moin.cgi/RunningSetup> Thanks, Thomas

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HowTo Search in nested lists
by Florian Lindner Jan. 30, 2004

Jan. 30, 2004

Hello, I've two nested lists which are representing a table or matrix. A = [1, 2, 3] B = [4, 5, 6] C = [7, 8, 9] t = [A, B, C] print t[0][2] # Prints 3 Now I found to search for certain values in a certain column. For example: column 1, search for 5, return 1, because 5 is found in the first column of the second element of t I hope I could explain what I want. Is there any way to do that except: for i in len(t): if t[i][1] == "phrase": found = i break Thx, Florian

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Source specific multicast implementation..
by Manoj K Pandey Jan. 30, 2004

Jan. 30, 2004

hi All, Do we have Source Sepcific Multicast, SSM implemented in python... Does anyone have any API for it, which they would like to share? thnx in advance, manoj ****************************** Manoj Pandey, PhD student, #207C, Network Research Lab, Deschutes, Computer and Information Science, University of Oregon, Phone# 541-346-0892 [Office], www.cs.uoregon.edu/~manoj ******************************

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Your message to bug-gs awaits moderator approval
by bug-gs-bounces＠ghostscript.com Jan. 30, 2004

Jan. 30, 2004

Your mail to 'bug-gs' with the subject hi Is being held until the list moderator can review it for approval. The reason it is being held: SpamAssassin identified this message as possible spam Either the message will get posted to the list, or you will receive notification of the moderator's decision. If you would like to cancel this posting, please visit the following URL: http://www.ghostscript.com/mailman/confirm/bug-gs/c960d6e9894865ef4d202f784…

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RE: How to start a DTS Package on MS-SQL-Server?
by Tim Golden Jan. 30, 2004

Jan. 30, 2004

>-----Original Message----- >From: usenet(a)mail-2-me.com [mailto:usenet@mail-2-me.com] >Sent: 30 January 2004 12:48 >To: python-list(a)python.org >Subject: How to start a DTS Package on MS-SQL-Server? > > >Hi! > >Does anybody know how to start a DTS-Package on a MS-SQL-Server out of >a Python-Script? > >Thanks for your help! > >Dirk Haven't tried it, but there is a dtsrun executable (C:\Program Files\Microsoft SQL Server\80\Tools\BINN\dtsrun.EXE) in my setup, which seems hopeful. There is also a DTS COM library which might do something. TJG ________________________________________________________________________ This e-mail has been scanned for all viruses by Star Internet. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________

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Re: easiest transition for a PHP website to move to Python?
by Diez B. Roggisch Jan. 30, 2004

Jan. 30, 2004

> I've got a database-driven website that's written entirely in PHP. > > It's all pretty MVC : NOT embedded little calls inside HTML, but > rather little controller apps in the webroot that merge data with > HTML templates on the fly. > > But for various reasons (mostly fun) I want to rewrite it in Python. > > There are so many different approaches, though! Zope, Twisted, > mod_python, clearsilver, and all the goodies in standard library. Regardless my answer to Lothar's posting (which is about zope not beeing python), I agree with him that webware appears to be close to what you are expecting from a web-framework. So the transition to webware might be the easiest, if you want to do it as straight-forward as possible. Mind you, I never worked with webware so far, but it looks promising. However, ZOPE has a different approach. Its outstanding feature is the built-in database ZODB. This is a hierarchical strucured object-orientied database with versioning. It stores everything - app-logic, templates and data. Together with CMF/Plone or ZMS, there exist nice and clean dublin-core aware data-from-layout-abstractions. Setting up a blog or even much more complicated, content driven website is only a matter of a few clicks. All editing of content is done via the webbrowser, and as zope comes with its own user-model, its easy for you as admin to create new accounts and grant fine-grained access to your sites for their respective authors/editors/whatever. So I would definitly advise you to take a look at zope - install it and play around with it, especially with plone or zms. But as said before - if you are actually seeking for the smoothest transition, you might be better off with webware. Regards, Diez

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Re: Simple list question
by Stefan Axelsson Jan. 30, 2004

Jan. 30, 2004

In article <mailman.1047.1075478440.12720.python-list(a)python.org>, Dave Brueck wrote: > How about: > >>>> nod = ['1','+','2'] >>>> for i in range(len(nod)): > ... try: > ... nod[i] = float(nod[i]) > ... except ValueError: pass > ... >>>> nod > [1.0, '+', 2.0] Perhaps minor style issue; I'd use 'map' (even though Guido isn't crazy about it), or perhaps a list comprehension. Like so: >>> def tofloat(x): ... try: ... return float(x) ... except ValueError: return x ... >>> map(tofloat, nod) [1.0, '+', 2.0] Stefan, -- Stefan Axelsson (email at http://www.cs.chalmers.se/~sax)

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