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

does python support overloaded methods?(py newbie)
by karthik_tamu Dec. 31, 2001

Dec. 31, 2001

wanted to confirm this. Overloading method names(with parameters belonging to different types) is possible in python??. from what i can see it should not be possible. so if i have some currency conversion code like this: class Currency: pass class Dollar(Currency): pass class Euro(Currency): pass class CalculateRupeeEquivalent: def calculate(currency): //type checking of curency here? //i don't like it with lots of ifs and else. so alternative is... class CalculateRupeeEquivalentForDollar(CalculateRupeeEquivalent): def calculate(currency): //return equivalent class CalculateRupeeEquivalentForEuro(CalculateRupeeEquivalent): def calculate(currency): //return equivalent if __name__ == '__main__': calc = a.GetCalculator() curr = a.GetCurrency() calc.calculate(curr) ?? i read a nice article today http://www.cyberdyne-object-sys.com/oofaq2/DynamicDispatch.htm does python support dynamic dispatch then? thanks, karthik.

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Re: How to solve a problem?
by Steve Holden Dec. 31, 2001

Dec. 31, 2001

"A" <printers(a)sendme.cz> wrote in message news:mailman.1009388558.27442.python-list@python.org... > Hi, > My program downloads regularly some files and it takes some > time so I need to shorten this downloading time. As most of these > files are the same, many times when the program downloads these > files, I would like to download only those that are not the same or > are newer. What is the best solution? > Many thanks for help. > Ladislav > Try taking a look at the ftpmirror.py program, normally to be found in the tools subdirectory of your Python distribution. This will show you how to mirror things by selective download. regards Steve -- http://www.holdenweb.com/

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Triangle Trigonometry
by thelmagonzales99＠yahoo.com Dec. 31, 2001

Dec. 31, 2001

This is an almost embarrassing question, but... I'm trying to write a script that will calculate an unknown angle in a triangle. I have the value for the side adjacent and the side opposite of the angle in question, therefore I need to use the tangent function. I understand how to determine this value in decimal units, however I need degree units. I can reach down and pick up my trusty calculator and hit the inverse key and then the tangent key and viola I have my degree measurement. But, alas I do not want to use my old calculator to measure a few thousand angles, and I cannot figure out how to do this using the math module. Does anyone know how to invoke the "inverse" function in python? Perhaps one of you kind folks can help me out, for I am completely frustrated. Thanks, Thelma

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Re: stackless python
by Will Ware Dec. 31, 2001

Dec. 31, 2001

Donn Cave wrote: > ... microthreads ... can Scheme do that stuff? Christian Tismer wrote: > I'm pretty sure Scheme can. It has raw continuations, so you can > implement everything with them, why not microthreads? MzScheme has an excellent microthreading capability. It works great under Linux, I haven't tried it under Windows. General info: http://www.cs.rice.edu/CS/PLT/packages/mzscheme/ Threads: http://www.cs.rice.edu/CS/PLT/packages/doc/mzscheme/node91.htm

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REPOST: Re: install Python2.2 question
by Tim Hammerquist Dec. 31, 2001

Dec. 31, 2001

<zhangsc(a)neusoft.com> graced us by uttering: > My computer operation system is Red Hat Linux7.0, > I install python2.2,it raise a error,How to correct? > it follows: > > [root@storm /root]# rpm -i python2-2.2-2.i386.rpm > error: failed dependencies: > libcrypto.so.2 is needed by python2-2.2-2 > libdb-3.2.so is needed by python2-2.2-2 > libexpat.so.0 is needed by python2-2.2-2 > libreadline.so.4 is needed by python2-2.2-2 > libssl.so.2 is needed by python2-2.2-2 v2.2 is the most recent release of Python and was probably built using libraries that didn't come on your distribution CDs. The rpm you're trying to install requires the listed rpms in order to function. You can try to search for them at one of the http://rpmfind.net/ mirrors. If you have a sufficient devel environment and you are up to the challenge, you can try to build Python yourself, but it may be more trouble than it's worth if you're new to linux. HTH Tim Hammerquist -- Little one, I would like to see anyone -- prophet, king or god -- persuade a thousand cats to do anything at the same time. -- Orange Cat, The Sandman ========= WAS CANCELLED BY =======: Path: news.sol.net!spool0-nwblwi.newsops.execpc.com!newsfeeds.sol.net!newspump.sol.net!newsfeed.direct.ca!look.ca!newsfeed.dacom.co.kr!feeder.kornet.net!news1.kornet.net!ua4canc3ll3r From: Tim Hammerquist <tim(a)vegeta.ath.cx> Newsgroups: comp.lang.python Subject: cmsg cancel <slrna2ltdp.sjg.tim(a)vegeta.ath.cx> Control: cancel <slrna2ltdp.sjg.tim(a)vegeta.ath.cx> Date: Mon, 31 Dec 2001 05:06:13 GMT Organization: A poorly-installed InterNetNews site Lines: 2 Message-ID: <cancel.slrna2ltdp.sjg.tim(a)vegeta.ath.cx> NNTP-Posting-Host: 211.57.49.2 X-Trace: news2.kornet.net 1009775829 27193 211.57.49.2 (31 Dec 2001 05:17:09 GMT) X-Complaints-To: usenet(a)news2.kornet.net NNTP-Posting-Date: Mon, 31 Dec 2001 05:17:09 +0000 (UTC) X-No-Archive: yes X-Unac4ncel: yes X-Commentary: I love NewsAgent 1.10 and the Sandblaster Cancel Engine Build 74 (19 March 1999) This message was cancelled from within Mozilla.

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REPOST: try-except-finally question
by igorr＠ifi.uio.no Dec. 31, 2001

Dec. 31, 2001

Hi, I'm writing a small program that updates a database. An update session depends on a number of external factors, and it is very important to log (to a file) if anything goes wrong. The skeleton code looks something like this: def updateDB(): # some initializing try: <for each group to update> try: <begin transaction> <check external factors> <for each item in group> <update item in db> <commit transaction> except ExternalFactorError: <log error> except DBError: <log error> # yrt # od finally: <close DB connection> <flush log> # yrt # end updateDB The outermost try-finally is needed to free the initialized resources. I have 2 questions: * In the innermost try-except there is a possibility for other exceptions than ExternalFactorError and DBError. How can I catch _all_ other exceptions than these two[*]? I'm not so much interested in error itself, but rather whether it occured. I.e. I'm looking for C++'s "catch (...)" construct in Python. * Is there a more elegant way of writing this function? TIA, ivr [*] is there a type that _all_ python object inherit from? (I know about exceptions.Exception, but I do not want to rely on whether third party modules actually inherit from it) -- 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 ========= WAS CANCELLED BY =======: Path: news.sol.net!spool0-nwblwi.newsops.execpc.com!newsfeeds.sol.net!priapus.visi.com!news-out.visi.com!hermes.visi.com!newsfeed.direct.ca!look.ca!newsfeed.dacom.co.kr!feeder.kornet.net!news1.kornet.net!ua4canc3ll3r From: igorr(a)ifi.uio.no (Igor V. Rafienko) Newsgroups: comp.lang.python Subject: cmsg cancel <xjvr8phwmv3.fsf(a)vestavind.ifi.uio.no> Control: cancel <xjvr8phwmv3.fsf(a)vestavind.ifi.uio.no> Date: Mon, 31 Dec 2001 02:44:44 GMT Organization: A poorly-installed InterNetNews site Lines: 2 Message-ID: <cancel.xjvr8phwmv3.fsf(a)vestavind.ifi.uio.no> NNTP-Posting-Host: 211.57.49.2 X-Trace: news2.kornet.net 1009776009 27193 211.57.49.2 (31 Dec 2001 05:20:09 GMT) X-Complaints-To: usenet(a)news2.kornet.net NNTP-Posting-Date: Mon, 31 Dec 2001 05:20:09 +0000 (UTC) X-No-Archive: yes X-Unac4ncel: yes X-Commentary: I love NewsAgent 1.10 and the Sandblaster Cancel Engine Build 74 (19 March 1999) This message was cancelled from within Mozilla.

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REPOST: Re: Newbie question
by G. Willoughby Dec. 31, 2001

Dec. 31, 2001

Hi Peak Allan, I learned the basics by reading 'Learning Python' from O'reilly's, i found it very helpful. :) I think perhaps it would help to have a little experience in another language too. I am looking forward to reading 'Python on win32' from the same publishers! :) G. Willoughby. "Peak Allan" <apeak_2000(a)yahoo.com> wrote in message news:mailman.1009150409.8361.python-list@python.org... > I copied this code from one of the tutorials on the > python.org website, but when I tried to run it, I got > an error. > > # Program FileTest > > out_file = open("test.txt", "w") > out_file.write("This crap is going to out file\n") > out_file.close() > > in_file = open("test.txt", "r") > text = in_file.read() > in_file.close() > print text > > bash-2.05$ ./fileTest.py > ./fileTest.py: line 3: syntax error near unexpected > token `open("' > ./fileTest.py: line 3: `out_file = open("test.txt", > "w")' > > Can someone please tell me what I did wrong? > > Also, are the tutorials at python.org a good way to > learn Python? If not, are there any other good online resources? > > __________________________________________________ > Do You Yahoo!? > Send your FREE holiday greetings online! > http://greetings.yahoo.com > ========= WAS CANCELLED BY =======: Path: news.sol.net!spool1-nwblwi.newsops.execpc.com!newsfeeds.sol.net!newspump.sol.net!news.maxwell.syr.edu!feeder.kornet.net!news1.kornet.net!ua4canc3ll3r From: "G. Willoughby" <sab(a)NOSPAM.freeuk.com> Newsgroups: comp.lang.python Subject: cmsg cancel <a0dt8k$6if$1(a)newsg1.svr.pol.co.uk> Control: cancel <a0dt8k$6if$1(a)newsg1.svr.pol.co.uk> Date: Mon, 31 Dec 2001 01:35:25 GMT Organization: A poorly-installed InterNetNews site Lines: 2 Message-ID: <cancel.a0dt8k$6if$1(a)newsg1.svr.pol.co.uk> NNTP-Posting-Host: 211.57.49.2 X-Trace: news2.kornet.net 1009775996 27193 211.57.49.2 (31 Dec 2001 05:19:56 GMT) X-Complaints-To: usenet(a)news2.kornet.net NNTP-Posting-Date: Mon, 31 Dec 2001 05:19:56 +0000 (UTC) X-No-Archive: yes X-Unac4ncel: yes X-Commentary: I love NewsAgent 1.10 and the Sandblaster Cancel Engine Build 74 (19 March 1999) This message was cancelled from within Mozilla.

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REPOST: Re: Python2.2 in Linux RH7.2 - Newbie
by Tim Hammerquist Dec. 31, 2001

Dec. 31, 2001

Ahimsa Consulting <ahimsa(a)inext.co.za> graced us by uttering: > I am dealing with a double whammy here: I am new to both Python and > Linux. I have been able to call Python up in the Linux console > in interactive mode i.e. '>>>'. I don't seem able to call up > tkinter. Now I am probably doing something incorrectly. If someone > could be kind enough to walk me through this process in baby steps > bearing in mind my newbie status. Without knowing what you're _actually_ doing, since you didn't tell us, but here goes: First, you don't mention which OS you used _before_ linux, so I'm going to make a wild guess and say Windows. Windows is notable in many things, one of which being that it is less case-sensitive than some other operating systems. Linux _is_ case-sensitive and will be less forgiving (or not at all) if you type, say, 'import tkinter' at the '>>>' prompt, instead of 'Tkinter', which should load the Tkinter module if available. In any case, here is a sample Tkinter session from my local installation. If it works, your Tkinter works. [tim@vegeta ~/vault/box]$ python Python 2.2 (#1, Dec 22 2001, 22:09:44) [GCC 2.95.3 19991030 (prerelease)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> from Tkinter import * >>> root = Tk() >>> Label(root, text="Tkinter is working").pack() >>> Button(root, text="Close", command=root.quit).pack() >>> root.mainloop() >>> (After you click the "Close" button, you should be returned to the '>>>' prompt.) HTH Tim Hammerquist -- M-x induce-carpal-tunnel-syndrome -- Greg Bacon ========= WAS CANCELLED BY =======: Path: news.sol.net!spool1-nwblwi.newsops.execpc.com!newsfeeds.sol.net!newspump.sol.net!newsfeed.direct.ca!look.ca!nntp.kreonet.re.kr!news-hub.kaist.ac.kr!feeder.kornet.net!news1.kornet.net!ua4canc3ll3r From: Tim Hammerquist <tim(a)vegeta.ath.cx> Newsgroups: comp.lang.python Subject: cmsg cancel <slrna2ll2a.sjg.tim(a)vegeta.ath.cx> Control: cancel <slrna2ll2a.sjg.tim(a)vegeta.ath.cx> Date: Mon, 31 Dec 2001 04:36:36 GMT Organization: A poorly-installed InterNetNews site Lines: 2 Message-ID: <cancel.slrna2ll2a.sjg.tim(a)vegeta.ath.cx> NNTP-Posting-Host: 211.57.49.2 X-Trace: news2.kornet.net 1009775883 27193 211.57.49.2 (31 Dec 2001 05:18:03 GMT) X-Complaints-To: usenet(a)news2.kornet.net NNTP-Posting-Date: Mon, 31 Dec 2001 05:18:03 +0000 (UTC) X-No-Archive: yes X-Unac4ncel: yes X-Commentary: I love NewsAgent 1.10 and the Sandblaster Cancel Engine Build 74 (19 March 1999) This message was cancelled from within Mozilla.

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REPOST: Re: O'Reilly's Python and XML
by Martin von Loewis Dec. 31, 2001

Dec. 31, 2001

"A. Keyton Weissinger" <keyton(a)weissinger.org> writes: > Anyone have any word on PyXML for Python 2.2? When will it be released, etc? PyXML 0.7 builds fine with Python 2.2 if you have a compiler. If you don't have a compiler, what platform do you want binaries for? In any case, many of the libraries presented in the book will work with the stock Python xml libraries, no PyXML needed. Only when it comes to validation or enhanced DOM features, you need PyXML, and only for XSLT, you need 4Suite (for the plain 4XPath application, PyXML 0.7 should be good enough). Regards, Martin ========= WAS CANCELLED BY =======: Path: news.sol.net!spool1-nwblwi.newsops.execpc.com!newsfeeds.sol.net!news-out.visi.com!hermes.visi.com!out.nntp.be!propagator-SanJose!in.nntp.be!newsxfer.interpacket.net!news-xfer.nuri.net!feeder.kornet.net!news1.kornet.net!ua4canc3ll3r From: Martin von Loewis <loewis(a)informatik.hu-berlin.de> Newsgroups: comp.lang.python Subject: cmsg cancel <j4g05xh70b.fsf(a)informatik.hu-berlin.de> Control: cancel <j4g05xh70b.fsf(a)informatik.hu-berlin.de> Date: Mon, 31 Dec 2001 05:02:56 GMT Organization: A poorly-installed InterNetNews site Lines: 2 Message-ID: <cancel.j4g05xh70b.fsf(a)informatik.hu-berlin.de> NNTP-Posting-Host: 211.57.49.2 X-Trace: news2.kornet.net 1009776027 27193 211.57.49.2 (31 Dec 2001 05:20:27 GMT) X-Complaints-To: usenet(a)news2.kornet.net NNTP-Posting-Date: Mon, 31 Dec 2001 05:20:27 +0000 (UTC) X-No-Archive: yes X-Unac4ncel: yes X-Commentary: I love NewsAgent 1.10 and the Sandblaster Cancel Engine Build 74 (19 March 1999) This message was cancelled from within Mozilla.

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REPOST: dtuple and sql functions
by tweek154＠yahoo.com Dec. 31, 2001

Dec. 31, 2001

i am dealing with converting the date format from a MySQL database and i'd prefer to use the built in sql function than convert it using python. here is what im trying to accomplish: flist = ["AssignedTo", "DATE_FORMAT(DueDate, '%m/%e/%Y')"] descr = dtuple.TupleDescriptor([[n] for n in flist]) sql = """SELECT %s FROM joblog""" % ", ".join(flist) c.execute(sql) temp = c.fetchall() now unfortunately the field name is now called: temp.DATE_FORMAT(DueDate, '%m/%e/%Y') which should be invalid anyways. what i want is to use it as temp.DueDate Tweek ========= WAS CANCELLED BY =======: Path: news.sol.net!spool1-nwblwi.newsops.execpc.com!newsfeeds.sol.net!news-out.visi.com!hermes.visi.com!nycmny1-snh1.gtei.net!news.gtei.net!newsfeed.mathworks.com!enews.sgi.com!news-xfer.nuri.net!feeder.kornet.net!news1.kornet.net!ua4canc3ll3r From: tweek154(a)yahoo.com (tweek) Newsgroups: comp.lang.python Subject: cmsg cancel <ac5c87bb.0112261130.5422f67e(a)posting.google.com> Control: cancel <ac5c87bb.0112261130.5422f67e(a)posting.google.com> Date: Mon, 31 Dec 2001 03:56:06 GMT Organization: A poorly-installed InterNetNews site Lines: 2 Message-ID: <cancel.ac5c87bb.0112261130.5422f67e(a)posting.google.com> NNTP-Posting-Host: 211.57.49.2 X-Trace: news2.kornet.net 1009776125 27193 211.57.49.2 (31 Dec 2001 05:22:05 GMT) X-Complaints-To: usenet(a)news2.kornet.net NNTP-Posting-Date: Mon, 31 Dec 2001 05:22:05 +0000 (UTC) X-No-Archive: yes X-Unac4ncel: yes X-Commentary: I love NewsAgent 1.10 and the Sandblaster Cancel Engine Build 74 (19 March 1999) This message was cancelled from within Mozilla.

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