🌐 Mailman 3 August 2000 - Python-list - python.org

signal
by Thomas Thiele Aug. 1, 2000

Aug. 1, 2000

I want to do this under WinNT (under UNIX it works fine bur NT did know SIGALRM: def Loop_Init(self): signal.signal(signal.SIGALRM, self.LoopSignalHandler) signal.alarm(self.updatetime) def LoopSignalHandler(self, signum, frame): self.Update() signal.alarm(self.updatetime) I need a functionality to update some things periodically and I don't want rto use an extra thread for this. Any ideas?

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problems with telnetlib
by jtoy Aug. 1, 2000

Aug. 1, 2000

I have tried several sample scripts including the oses at python.org, but I can't get any of the scripts to work properly. I have Python 1.5.2 on Linux 2.2.15. All I want to do is write a script that telnets into a machine and executes '/etc/email'. I can safely get up to the password prompt with: from telnetlib import Telnet tn = Telnet('192.168.0.254') tn.read_until('login: ') tn.write('someuser\n') tn.read_until('password: ') tn.write('password\n') tn.read_until('$ ') then I get error in line 224 read_very_lazy and in 300 read_very_lazy My exact login prompt after a normail telnetsession is: [user@localnet user]$ So reading until '$' should be write. Also, after I type tn.read_until('password: '), thr python prompt freezes for 30 seconds but continues normally after, why is this? -- Jason Toy toyboy(a)toy.eyep.net jtoy(a)tcgfinancial.com http://toy.eyep.net

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Difference between double and single quotes
by pauljolly＠my-deja.com Aug. 1, 2000

Aug. 1, 2000

Dear All, Please can someone tell me whether Python distinguishes between double and single quotes in any way? This was brought to my attention by a friend who queried my use of double and single quotes, saying that in the UNIX shell a distinction is made. Many thanks in advance. Regards Paul Jolly Sent via Deja.com http://www.deja.com/ Before you buy.

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Playing with pyesd.
by Aaron Berg Aug. 1, 2000

Aug. 1, 2000

Index: esd.swig =================================================================== RCS file: /usr/local/cvsroot/pyesd/esd.swig,v retrieving revision 1.1.1.1 diff -u -r1.1.1.1 esd.swig --- esd.swig 1999/07/23 16:07:44 1.1.1.1 +++ esd.swig 2000/08/01 00:49:16 @@ -43,6 +43,12 @@ } esd_sample_info_list_t; static int has_error; + +int esd_open_sound_local() + { + return esd_open_sound(NULL); + } + %} %except(python) @@ -166,6 +172,12 @@ rate, format = (bits | channels | stream | func) */ int esd_open_sound( const char *host ); + +/* + Like esd_open_sound(), but does not require the specification of server, + automatically connects to the server on the local system. +*/ +int esd_open_sound_local(); /* lock/unlock will disable/enable foreign clients from connecting */ Index: esd_class.py =================================================================== RCS file: /usr/local/cvsroot/pyesd/esd_class.py,v retrieving revision 1.1.1.1 diff -u -r1.1.1.1 esd_class.py --- esd_class.py 1999/07/23 16:07:44 1.1.1.1 +++ esd_class.py 2000/08/01 00:50:47 @@ -35,6 +35,11 @@ from StringIO import StringIO from types import StringType +class ComError(Exception): + """ + Raised when unable to connect to the ESD server. + """ + class Sample: """ @@ -112,9 +117,10 @@ typically consisting of `ESD_STEREO` or `ESD_MONO`, `ESD_BITS8` or `ESD_BITS16` or'd together. """ - ServerConnection.__init__(self, - esd_play_stream(format, rate, host, name) - ) + sock = esd_play_stream(format, rate, host, name) + if sock < 0: + raise ComError('Unable to c5onnect to ESD server on %s' % host) + ServerConnection.__init__(self, sock) class ServerSession(ServerConnection): @@ -123,8 +129,17 @@ Allows you to query server information and manage samples. """ - def __init__(self, host): - ServerConnection.__init__(self, esd_open_sound(host)) + def __init__(self, host = None): + if host: + sock = esd_open_sound(host) + else: + sock = esd_open_sound_local() + + if sock < 0: + raise ComError('Unable to connect to ESD server on %s' % + host and host or '<local>' + ) + ServerConnection.__init__(self, sock) def lock(self): """ Index: esdtest =================================================================== RCS file: /usr/local/cvsroot/pyesd/esdtest,v retrieving revision 1.1.1.1 diff -u -r1.1.1.1 esdtest --- esdtest 1999/07/23 16:07:44 1.1.1.1 +++ esdtest 2000/08/01 00:51:05 @@ -50,7 +50,7 @@ ) print 'connecting to daemon' -s = esd.ServerSession('localhost') +s = esd.ServerSession() print 'caching bell sample in server' sampleId = s.cacheSample(bellwave, 'pyesd bell sample')

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Re: Content of the Perl6 talk
by Conrad Schneiker Aug. 1, 2000

Aug. 1, 2000

Hi, Andreas Otto wrote: > Guido van Rossum wrote: > > > > Dan Kuchler <kuchler(a)ajubasolutions.com> writes: > > > > > If done correctly, only the perl front end would have to be > > > implemented, but it would give others the opportunity for trying to > > > write some new syntax (which could be like tcl, python, etc.) that > > > would work with the existing perl backend. <snip> > On some time in the future the discussion will come to the point > that it is nessecarry to work together and *all* languages will > benefit. > > To write a generic computer language which do > > perl,phyton,tcl ==> META code ==> perl,phyton,tcl,bytecode,c ... > > you need 2 *big* brain guys for every language and ~6 month's > full time (6*12 hours) work. While Guido pointed out some problems with a common runtime in <URL:http://deja.com/=dnc/getdoc.xp?AN=652175964>, I don't see why this precludes adding features that would be useful to Python, Tcl, and Ruby to it, if the Perl6 people were cooperative. They might well want to eventually (somehow) make such capabilities accessible from Perl6+. Big question: is anyone discussing these sorts of things with anyone directly involved in the Perl6 effort? Does anyone know of any good prospects for ambassadors out there? (I think that developing Perl6 in such a way that its core could be "the .Net of the leading open source languages" might have some sort of meta-appeal for Larry Wall's post-modern language outlook. :-) -- Conrad Schneiker (This note is unofficial and subject to improvement without notice.)

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popen under nt?
by Thomas Thiele Aug. 1, 2000

Aug. 1, 2000

Hi! I'm looking for a functinality like popen but under nt. It meands starting a new programm in a new "process" and read stdout and stderr.

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Re: Why make a language case sensitive?
by unknown＠example.com Aug. 1, 2000

Aug. 1, 2000

As a VB freak (or ex-thereof), I need to point out that the VB IDE will attempt to make all variables and keywords use the same case. So, for example, "if" is always 'converted' as "If" and if you declare a variable as such: Dim m_Spam As Long (which, BTW, the IDE would have 'fixed' the words 'Dim', 'As' and 'Long') and then you need to refer to m_Spam, you can type it without any capitals, and when you move the cursor to another line, the IDE will look up the declaration and match the case of the new instance of the variable with that of the declaration... For example, I type: m_spam = M_SPAM + 42 <ENTER> and it becomes: m_Spam = m_Spam + 42 ...which keeps the readability. (doesn't it?) Also, now that I have this line of code, if I go back to the declaration and change 'm_Spam' to 'm_SpAm', all the references 'm_Spam' will now read 'm_SpAm'... So, I can't say that I agree with you when you say that forcing the user to type the name correctly will improve readability, especially in the case of Pyton when a mis-typed variable name results in a new binding being created, and not a compile-time error, like in C. I once read an "article" (more like a joke) on how to write really bad (obfuscated) C code, and one of the "tips" was to mix the cases of the letters making up variable names.... If you have a pre-processor or a powerful IDE (more like a compiler built into an IDE), you can achieve readability that is customized to the person reading and making a change in the "readability" of a name does not require doing a [case-sensitive] find/replace. Let the user have only to remember the sequence of characters and let the computer find out (in a previous declaration or usage) how they should be capitalized. I love Python. I hope case sensitivity doesn't stay around for too long. All it *really* allows you to have is something like a previous post, where a file requires a close method with a small C and for a DB connection, a close method with a capital C: aFile.close() aConnection.Close() ...which just seems pretty silly to me, especially if you're someone trying to use code from two different sources, and they have adopt similar conventions, except the case is different. People just don't think like computers: 'a' and 'A' are the same letter, and you bring up a good example in your last paragaph... -- ---------------------------------------------------------------------- Olivier A. Dagenais - Carleton University - Computer Science III "Anders Eggers-Krag" <aek(a)aek.dk> wrote in message news:jbPb5.1245$bb.28195@news101.telia.com... > I would say that it improves syntax consequense, leading to more readable > code > for others, you are never in doubt about what to look for when looking for a > keyword, > > in VB you might look for IF, If or if, and they look very different, and it > becomes a lot harder > to read somebody elses code. > > the case insensitivity is nice when I am the only one to read my code as I > could then choose my > own obscure notation such as mYmetOd() and keep it consequent writing dEf, > claSs, If eTc. > wheras case sensitivity makes it more natural to keep a more sensitive > manner such as myMethod() > MyMethod() or my_method() throughout that everyone can agree on, I believe > that case sensitivity > leads to more uniform code, that again makes it easier to read your > collegues code. And i think it should > seem natural to everyone, after all books are written in case sensitive... > you can't write: "i Am the wisEst > One of aLl." and be taken seriously > > But it depends on which kind of access is needed to the system ie it would > be dreadfull if DNS > or SMTP servers were case sensitive and user enters MicroSoft.com and gets > nowhere because > he should have written microsoft.com. > > > -- > Anders Eggers - Krag > > > "Peter Timaratz" <timaratz(a)lisco.com> wrote in message > news:000801bfeda1$fcd99a20$6cb745c6@timaratz... > > I can't think of any advantages to a case sensitive language. Python is a > > very well-designed language though, so I imagine there is a good reason > that > > it is case sensitive. So what are the advantages of a case sensitive > > language? > > > > > >

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Convoluted question
by Daley, Mark W Aug. 1, 2000

Aug. 1, 2000

I am a little frustrated by this situation. I have written some code to take an indeterminate number of server names to create a column of check buttons: from Tkinter import * import dbi, odbc, time, os, sys, Pmw servername = ['Server1', 'Server2', 'Server3', ..., 'Servern'] for item in range(len(servername)): b1 = Checkbutton(root, text = servername[item], variable = var) b1.grid(row = item, column = 0, sticky = W) I am at a loss for how to differentiate the variable names in the loop. One suggestion was to use a dictionary, although there were no details involved in that suggestion. Another was to do something like this (pseudocode, thank you, Michal): btnLst = [] for x in range(whatever): newBtn = SomeButton() # just create the widget btnValue = SomeValue() # read from a list, maybe? newBtn.pack() # or whatever to get it on the screen list.append((newBtn,btnValue) and later on: for button in btnLst: if button.isChecked: DoWhatever() I attempted to use a list of variable names to be assigned as needed when creating the checkbuttons, but I keep getting NameErrors when I go to print the values: servername = ['Server1', 'Server2', 'Server3', ..., 'Servern'] varlist = ['var0', 'var1', 'var2', ..., 'varn'] for item in range(len(servername)): b1 = Checkbutton(root, text = servername[item], variable = varlist[item]) b1.grid(row = item, column = 0, sticky = W) Exception in Tkinter callback Traceback (innermost last): File "C:\Program Files\Python\Lib\lib-tk\Tkinter.py", line 764, in __call__ return apply(self.func, args) File "C:\PYTHON\gui.py", line 14, in showvalues print var0 NameError: var0 I think this comes from the fact that I didn't define the names in varlist as variables. It seems to me that there should be an easy way to assign variable names for each check button in an automated way, and an easy way to return the status of a check button. I haven't found either after almost a full day of coding and poring over different texts, such as 'Python Essential Reference' and 'Python and Tkinter Programming'. Is what I want possible, or do I have to use what seems to me to be a more 'brute force' method? TIA - Mark ---------------------------------------------- The opinions expressed are mine, and are not necessarily those of my employer.

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Python-C++ Connection (CXX) demo project for Visual C++
by Phlip Aug. 1, 2000

Aug. 1, 2000

Newsgroupies I downloaded CXX and tried to compile its demo project with VC++6. My compiling efforts fizzled out with just a handful of linker errors; notably 'Py::operator<<' was missing. I searched my drive for it. Does anyone have the DSP file for VC++ for any trivial or demo CXX project ready to go? Or should I continue to hammer on these few but weird linker errors? -- Phlip ======= http://users.deltanet.com/~tegan/home.html =======

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Python & AI
by rhymes Aug. 1, 2000

Aug. 1, 2000

Do u know something on the net related to Artificial Intelligence and Python Language?? Thanx in advance. Lawrence Oluyede rhymes(a)tiscalinet.it "Per cambiare, per diventare un' altra cosa dobbiamo prima sapere cosa siamo" Bruce Lee

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