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

RE: syntactic sugar for filesystem access in Python
by Delaney, Timothy Sept. 29, 2000

Sept. 29, 2000

The main problem I see with the below suggestion is that it would *only* work with domain names. You couldn't do the following ... sock = internet.192.168.0.1['http'] However, this could be overcome by mapping internet.www.python.org (I prefer this ordering) to internet['www.python.org'] via a DNS lookup. This could then be the general form for the lookup. It would also be easier to code originally (only need to mess with __getitem__ rather than __getattr__). > >> How about extending it to include the Internet? ;) > >> > >> # First initialize the Internet ;) > >> internet = Internet() > > Better be careful you don't 'del internet' --- a lot of people will be > upset ;) > > >> sock = internet.org.python.www['http'] > >> > >> (although the bare sockets are probably not much fun, it > might be slightly > >> interesting if each "Address" object had method for > higher-level access to > >> protocols, e.g. something a la urllib.urlget(self.address).read()). > > > >Filesystem is cool and this is fabulous suggestion. > >- What would it take to get it working? > >- And where does this fit in with XML-RPC, SOAP and .NET ? > > I agree that it's a great suggestion. What would it take to get it > working? Somebody figuring out a decent way to map URLs into Python > namespace, and then implementing it --- probably not terribly tough, > although perhaps more than my one page of code for the > filesystem. How

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HELP!!! calling JPython from within Java
by shindich＠my-deja.com Sept. 29, 2000

Sept. 29, 2000

I'm trying to extend a Java application using JPython. And I'm having numerous problems going from Java into JPython. Has anyone done this? I have written a lot of Python code, but this is the first time I have touched JPython. Any working sample code on how to call a python function and pass it Java parameters would be appreciated. Thanks! Sent via Deja.com http://www.deja.com/ Before you buy.

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RE: Newbie question...
by shindich＠my-deja.com Sept. 29, 2000

Sept. 29, 2000

In article <mailman.970145388.3252.python-list(a)python.org>, =?iso-8859-1?Q?Max_M=F8ller_Rasmussen?= <maxm(a)normik.dk> wrote: > From: shindich(a)my-deja.com [mailto:shindich@my-deja.com] > > >Huh? Since when do you need to write separate functions for adding > >numbers and strings in Python? The buty of the language is that you can > >write template-like function easily. > >The following function will do the job: > > Shure can, but I was not trying to write clever code, I was trying to teach > a lesson. > > My experience from my teaching days has shown me that I don't come across > more clearly by showing the answer as a more complicated example than the > one the student allready had trouble understanding. > > If somebody has trouble understanding a problem, split it up in more simple > subproblems, don't show what can be done if you allready understand the > problem. > > Lecturing'ly yours - Max M > > I wasn't trying to write clever code either. If I were, I would have written something like: >>> def foo (**args): return reduce (lambda o1, o2: o1+o2, args.values ()) >>> foo (ugly='1', bad='2') '21' Sent via Deja.com http://www.deja.com/ Before you buy.

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tkInter - Achieving a particular control layout...
by Tobe Sept. 29, 2000

Sept. 29, 2000

Hi.. I have a tool bar in an app. of mine made from a frame in a window... I'd like to have the following button layout.. (Put your fixed width glasses on).... +---------------------------------+ |+--------+-------------+--------+| ||==== | ==== ==== | || ||=B1= | =B2= =B3= | || ||==== | ==== ==== | || |+--------+-------------+--------+| +---------------------------------+ My first thoughts were to have 3 frames within the toolbar in grid columns 0, 1 and 2 to separate the parent into 3 equal parts.. put a button in 0, sticky at W, 2 more in 1 and nothing in 2 then pack the toolbar with expand = X.. Unfortunately this doesn't seem to be working for me.. can anyone help me out here.. ?? Thanks.. t o b e Orchestream London

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smtp.sendmail and mail options
by Thomas Gagne Sept. 29, 2000

Sept. 29, 2000

The documentation says there's 4th and 5th arguments so I can specify mail options and receipt options. I'd like to specify "DeliveryMode=q" so I can send 400+ messages quickly without causing too many open fps in sendmail. Problem is, I keep getting an error when I try it: smtpServer.sendmail(fromAddr, toAddr, message, "DeliveryMode=q", "") I get: Traceback (innermost last): File "./notify.py", line 35, in ? smtpServer.sendmail("tgagne(a)efinnet.com", seller, sellerMessage, "DeliveryMode=q", "") File "/usr/lib/python1.5/smtplib.py", line 468, in sendmail raise SMTPSenderRefused(code, resp, from_addr) smtplib.SMTPSenderRefused: (501, '<tgagne(a)efinnet.com>... D parameter unrecognized', 'tgagne(a)efinnet.com') -- .tom

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continue statement: best way round a problem
by Steve Holden Sept. 29, 2000

Sept. 29, 2000

I'm trying to write a processing loop which, when any of a number of error conditions occurs, proceeds to the next iteration. This looked like an obvious case for continue, so my code reads (with extraneous elements removed) as follows: # # Iterate over database rows, processing each one in turn # donect = 0 for b in billings: try: # Some complicated stuff try: rtfstream = open("%(year)d/%(monthno)d/%(account)s" % bd).read() except: lf.log("??? Cannot find invoice file for %s" % bd["account"]) # # No invoice file means we should go on to next client # continue ######### no syntax error here # some more complicated stuff try: mxlist = MXlist(domain(bd["recipient"]), "ns2.i95.net") except KeyboardInterrupt: raise except: lf.log("an error message") lf.debug("a debugging message") # # No name servers means we should go on to the next client # continue ######### syntax error lf.log("an informative message"))) # A bit more complicated stuff except KeyboardInterrupt: print "Keyboard Interrupt" lf.log("??? Terminated by keyboard interrupt") break As the advanced reader may have already predicted, I get a syntax error with the second continue: SyntaxError: 'continue' not properly in loop (line [the second continue]) But I'm left trying to understand why the compiler isn't flagging an error for the first continue when it won't accept the second. In general, what's the accepted way of handling such cases? regards Steve PS The documentation is explicit that "continue" is valid inside an "except", but not in a "try" (due, as a footnote points out, to the implementor's laziness). Is this the problem? -- Helping people meet their information needs with training and technology. 703 967 0887 sholden(a)bellatlantic.net http://www.holdenweb.com/

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Re: Wholly unnecessary flame. (was Re: pyXML!)
by Grant Griffin Sept. 29, 2000

Sept. 29, 2000

Tim Peters wrote: > > [Tim] > > We Windows weenies are *all* major leeches off Mark Hammond's tireless > > multi-year Python Windows work, and he had no luck *begging* for help > > much of that time. > > [and among some similar replies, we have ...] > > [Max Møller Rasmussen] > > VC does not come installed on every windows machine you know. > > [[Monty Taylor] > > Which is a fairly appropriate summary as to why Open Source > > projects do tend to wither a bit on Windows. It's not quite so much > > fun to contribute if you have to pay for the priviledge. > > It's uncanny that, among tens of thousands of Windows Python users, a > handful just *knew* I was complaining about them specifically <wink>. > > It's a percentage game, Windows or not: the majority of users of any > project, regardless of platform, won't contribute anything tangible back. > That's fine; the game works that way for good & obvious reasons. But I > maintain that the percentage among Windows users is *remarkably* small, > after allowing for that relatively (compared to, say, Linux) few Windows > weenies have a usable compiler. It *appears* to be even worse on the Mac > (Classic OS), where Jack Jansen has been making Python fly seemingly all by > himself for years. > > Curious, isn't it? The availability of development tools isn't enough to > account for it; neither sheer number of users nor their platform expertise. > So don't think of it as an attack -- it's an invitation to ponder the > mysteries of human nature and how they manifest in choice of primary OS <0.9 > wink>. Hey waitaminute...are you suggesting that "techies"--who always gravitate toward "the best" technology--mostly seem to prefer the technology of Unix over the technology of Windows? And are you maybe suggesting that people who want to be a part of "The Open Source Movement" <getting teary eyed just thinking about it> would prefer an OS like "The GNU/Linux System" which is completely "open" (if not actually free in a "beer" sense <wink>) over Windows? in-that-case,-i-guess-i'm-stumped-too-<wink>-ly y'rs, =g2 -- _____________________________________________________________________ Grant R. Griffin g2(a)dspguru.com Publisher of dspGuru http://www.dspguru.com Iowegian International Corporation http://www.iowegian.com

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Newbie question...
by jhorn94＠my-deja.com Sept. 29, 2000

Sept. 29, 2000

I'm going thru the Learning Python book and am stumpped. The exercise calls for a function that accepts and arbitrary number of keyword arguments, then returns the sum of the values. I can step thru the arguments with a for statement, but I can't figure out how to accumlate a sum of the values. Any help is appreciated. def adder(**args): for x in args.keys(): y=y+x return y print adder(good=1, bad=2, ugly=3) print adder(good="a", bad="b", ugly="c") Traceback (most recent call last): File "C:\Python16\Pythonwin\pywin\framework\scriptutils.py", line 301, in RunScript exec codeObject in __main__.__dict__ File "C:\Python16\examples\lpython\sol\CH4EX4.PY", line 8, in ? print adder(good=1, bad=2, ugly=3) File "C:\Python16\examples\lpython\sol\CH4EX4.PY", line 4, in adder y=y+x UnboundLocalError: y Sent via Deja.com http://www.deja.com/ Before you buy.

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Re: basic python threading question
by Tom Sept. 29, 2000

Sept. 29, 2000

"matt" <matt(a)virtualspectator.com> wrote in message news:mailman.970172746.8175.python-list@python.org... > What is wrong with doing a deep copy? I was planning to do a deep copy, but then I looked at the code for it and found that it didn't really copy atomic objects. I figured this is because you can't really make a copy of an atomic object - until you change the copies' value, the interpreter would just double up on the original value. > And I thought atomic object were thread safe by definition, in so far as only > one processing cycle is required to execute it. If something is not thread > safe then it needs to be atomic such that in the more abstract sense a call on > it will have to go to completion before anything else gets a chance to use it. For 'processing cycle' I assume you mean Python byte code, and I'm not sure: does it only take one byte code to complete an operation on an atomic object? If so then I guess I've got my answer. > The other thing I am confused about is that I never really thought the object > itself could be thread-safe. Isn't thread safety only to do with how you > handle the methods that use an object, such that any methods that change an > object, and these should be part of the definition of the object, are the > things that are atomic. By a thead-safe object, I meant one that I could perform arbitrary operations on without having to lock it. If I can't make a real copy of it, then I hope it is 'thread-safe', or I'll have to do a lot of locking. But then again, I'm new to threading in Python so I could be wrong about all this. Tom. > > Matt > > On Fri, 29 Sep 2000, Tom wrote: > > I decided to give a thread its own copy of some data. But I gather that it > > is impossible to create a seperate copy of an atomic object (because the > > implementation is free to make both names bind to the same object). > > > > This would be a problem for threading, unless all atomic objects are > > thead-safe. Now, all atomic objects appear to me to be immutable. Are > > immutable objects inherently thread-safe in Python (even if the ref count > > change)? > > > > Thanks, > > > > Tom. > > > > > > > > > > -- > > http://www.python.org/mailman/listinfo/python-list >

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Re: [OT] python mailing list overhelpfullness
by drobinow＠my-deja.com Sept. 29, 2000

Sept. 29, 2000

In article <mailman.970156244.5188.python-list(a)python.org>, "Matthew Banham" <matb(a)photond.com> wrote: > This is a multi-part message in MIME format. > > ------=_NextPart_000_00E6_01C0296A.8AFB96B0 > This is not a flame but can users of the list please please please follow > discussions and respond if and only if they have something new to offer. > That way the world will be a little less noisy for us all :o) Sorry, but news transmittal is not instantaneous so it's quite common not to see previous responses. It goes with the territory. Could you try to avoid MIME and vcard. Sent via Deja.com http://www.deja.com/ Before you buy.

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