Re: Python IDE like NetBeans/Delphi IDE
Hello! WingIDE (commercial, slower than PythonWin but has many features) You can use and reactivate a trial licence for WingIDE for a realy long term, give it a try, i bought a licence last week and realy love it! Lg, AXEL. -- Aber naja, ich bin eher der Forentyp. Wolfibolfi's outing in http://www.informatik-forum.at/showpost.php?p=206342postcount=10 -- http://mail.python.org/mailman/listinfo/python-list
Re: specialdict module
Georg Brandl wrote: Georg Brandl wrote: Hello, in follow-up to the recent dictionary accumulator thread, I wrote a little module with several subclassed dicts. Comments (e.g. makes it sense to use super), corrections, etc.? Is this PEP material? Docstrings, Documentation and test cases are to be provided later. So, no further interest in this? Or should I write a PEP before? I'd personally like to see a PEP. It'd give people a chance to come up with some use cases that really justify adding such specialized dicts to the standard library. The only use cases I can come up with would be better served by functions that take a sequence and produce a dict (e.g. by counting items or by grouping items into lists). Once the dict is built, I usually have no more need for the default-specialized methods. I'm sure there are some good use cases out there for such dicts, but before I get behind this, I wouldn't mind seeing a few of them. =) STeVe -- http://mail.python.org/mailman/listinfo/python-list
Re: boring the reader to death (wasRe: Lambda: the Ultimate Design Flaw
Sunnan == Sunnan [EMAIL PROTECTED] writes: Sunnan It's just that I'm having a hard time matching that quote Sunnan to what I though python was about. I thought boring code Sunnan was considered a virtue in python. (Explicit is better Sunnan than implicit, sparse is better than dense.) Boring code is code that numbs your senses with constant flow of boilerplate crap, memory management and redundant type declarations and general blah blah that you skip when you are trying to figure out what a piece of code does. It's a code that you wish you could train a monkey to write for you while you go for lunch. Think C++ or Java. -- Ville Vainio http://tinyurl.com/2prnb -- http://mail.python.org/mailman/listinfo/python-list
Re: boring the reader to death (wasRe: Lambda: the Ultimate DesignFlaw
Sunnan == Sunnan [EMAIL PROTECTED] writes: Sunnan languages. I'm not sure whether I'd consider python Sunnan particularly terse, though, but I don't know enough about Sunnan it yet. (I've read a Read up on list comprehensions and generator expressions. You'll see the terse side of Python (and genexps look kinda poetic too ;-). -- Ville Vainio http://tinyurl.com/2prnb -- http://mail.python.org/mailman/listinfo/python-list
Re: Best editor?
Hello ChinStrap, When not using the interactive prompt, what are you using? I keep hearing everyone say Emacs, but I can't understand it at all. I keep trying to learn and understand why so many seem to like it because I can't understand customization even without going through a hundred menus that might contain the thing I am looking for (or I could go learn another language just to customize!). Emacs (or VIm in my case) takes time to learn. However when you start to understand it and know you way around it'll do things no other editor will do for you. Personally I like SciTE, it has everything I think a midweight editor should: code folding, proper python support, nice colors out of the box, hotkey access to compile (I'm sure emacs does this, but I couldn't figure out for the life of me how), etc. If you're happy with SciTE stay with it. Opinions on what the best is? Or reading I could get to maybe sway me to Emacs (which has the major advantage of being on everyone's system). Everyone has his/her/it own favorite editor. It's very individual, I'm hooked on VIm while others won't touch it. HTH. -- Miki Tebeka [EMAIL PROTECTED] http://tebeka.bizhat.com The only difference between children and adults is the price of the toys pgpztuUvZUl8y.pgp Description: PGP signature -- http://mail.python.org/mailman/listinfo/python-list
Re: cross platform printing
Hello David, Alan Isaac [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] I'd like to try personal financial management using Python. I just found PyCheckbook, but it does not support check printing. Is there a Python check printing application kicking around? wxPython is a cross platfom UI framework which has printing support. Maybe you can cook something. HTH. -- Miki Tebeka [EMAIL PROTECTED] http://tebeka.bizhat.com The only difference between children and adults is the price of the toys pgpEIgHIJHs3H.pgp Description: PGP signature -- http://mail.python.org/mailman/listinfo/python-list
Re: Best editor?
Hello! What do you think all about ActiveState Komodo? Michael George Lerner wrote: Aahz [EMAIL PROTECTED] wrote: Use vim. 80% of the power of emacs at 20% of the learning curve. A system administrator said this to me about unix a long time ago, but it applies equally well to emacs: Emacs is a great place to live, but I'd hate to visit. -michael, an (x)emacs user -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Google Server
vegetax wrote: Fuzzyman wrote: Of course - sorry. Thanks for the fix. Out of interest - why are you using this... just for curiosity, or is it helpful ? because is fun to surf on the google cache, =) Ha - cool ! The bizarre thing is, that for me it's actually useful. I doubt anyone else will be in the same situation though. Best Regards, Fuzzy http://www.voidspace.org.uk/python -- http://mail.python.org/mailman/listinfo/python-list
How to detect windows shutdown
I wrote a program running on windows. I put the link of the program in Start up folder and let it executed minimized. Every time when I open the computer, my program will be running in system tray. But if the user would like to shutdown the computer, the OS will show an error about exception. At first, I think windows will terminate all processes when it shutdown. So, if python has the way to dectect shutdown process, I can kill the process in advance. Thanks a lot. -- http://mail.python.org/mailman/listinfo/python-list
Re: Best editor?
Miki == Miki Tebeka [EMAIL PROTECTED] writes: Miki Emacs (or VIm in my case) takes time to learn. However when Miki you start to understand it and know you way around it'll do Miki things no other editor will do for you. Other editors also do stuff Emacs won't do. Code completion is a killer feature and emacs sucks at it (yes, w/ Cedet too). Emacs is pretty good for Python if you can't wait for something like Eclipse+pydev to start (which is a good choice, and worth learning). Emacs is not necessarily worth learning unless you are an emacs user already. Emacs also looks so horrible in Linux that I tend to go for Kate when I'm at home. -- Ville Vainio http://tinyurl.com/2prnb -- http://mail.python.org/mailman/listinfo/python-list
Re: A ClientForm Question
John J. Lee wrote, See second bullet point under Why does .click()ing on a button not work for me?. Thanks for you advice. However, after read through the FAQs, I have not managed to find a solution for my problem. I belive my button is coupled with some Java script which mess thing up and there is no a easy solution. Am I right? - narke -- http://mail.python.org/mailman/listinfo/python-list
Re: Decorator Base Class: Needs improvement.
On Wed, 06 Apr 2005 02:31:05 GMT, Ron_Adam [EMAIL PROTECTED] wrote: On Tue, 05 Apr 2005 19:38:38 -0400, Steve Holden [EMAIL PROTECTED] wrote: So what you are saying is that you would like to be able to use arbitrarily complex expressions after the :at sign, as long as they return a decorator? If so, you've been pronounced :-) regards Steve No not at all, I never said that. But.. ;-) If we get into what I would like, as in my personal wish list, that's a whole other topic. g I would have preferred the @ symbol to be used as an inline assert introducer. Which would have allowed us to put debug code anywhere we need. Such as @print total @. Then I can switch on and off debugging statements by setting __debug__ to True or False where ever I need it. And as far as decorators go. I would of preferred a keyword, possibly wrap, with a colon after it. Something like this. I don't understand your seeming fixation with wrappers and wrapping. That's not the only use for decorators. See Raymond Hettinger's optimizing decorators in the cookbook for instance. Decorators are something like metaclasses for functions, with much more general possibilities than wrapping, IMO. def function_name(x): return x wrap function_name: wrapper1() wrapper2() wrapper3() A wrap command could more directly accomplish the wrapping, so that def statements within def statements aren't needed. (Unless you want'ed too for some reason.) I think you'll have to show some convincing use cases showing a clear advantage over current decoration coding if you want converts ;-) And as far as arbitrary complex expressions go.. Actually I think that it's quite possible to do as it is. ;-) Yes and no. You can always write @deco and refer to an arbitrarily complex callable deco ..., but the actual @-line expression has to abide by the language grammar, and that does not allow arbitrary expressions. But it does provide enough rope. E.g. see my most recent reply to El Pitonero. But this is just a few of my current thoughts which may very well change. It's an ever changing list. g I can see that ;-) Regards, Bengt Richter -- http://mail.python.org/mailman/listinfo/python-list
Re: Does IronPython indicate MS interest in dynamic languages?
On Tue, 05 Apr 2005 23:34:25 -0400, Thomas Gagne [EMAIL PROTECTED] wrote: Cameron Laird wrote: snip And now, for something completely different, I'll tender a personal view: I think Mr. Gates and Python are actually destined to get along uncharacteristically well. Roughly, I suspect the habits and motivations of the two are so skew, that the usual embrace and extend simply won't obtain. I soberly expect IronPython to work out well for both Microsoft and Python. The techweb.com article said something interesting. Python is an open-source dynamic language; dynamic languages enable developers to produce applications more efficiently by reducing the amount of complexity in the code they write, Jason Matusow, program manager of Microsoft's Shared Source Initiative, writes on his blog. Microsoft's IronPython project demonstrates the benefits of putting the Python dynamic language on the .NET Common Language Runtime. Assuming (I don't know for certain) that MS's PR approves all messages that leave the building, I'm wondering if this foray into dynamic languages doesn't signal something greater on MS' part. While Sun and Java (and C# for the most part) have remained statically-typed, do you think IronPython might indicate a new direction for MS language development? If there is to be an MSPython, how long 'til Mozilla FirePython? ;-) Regards, Bengt Richter -- http://mail.python.org/mailman/listinfo/python-list
Re: Best editor?
[EMAIL PROTECTED] wrote:
On Tuesday 05 April 2005 11:22 am, ChinStrap wrote:
I keep hearing everyone say Emacs, but I can't understand it at all.
Both emacs and vi suffer from the fact that they can not be used by ordinary
humans.
My my my... I'm sorry to learn I'm not an ordinary human :(
Thus, I recommend using either to impress your friends.
Err... most of my friend not being coders, they don't even have a clue
about what are emacs and vim, so they're not really impressed. The other
are coders and use either vim or emacs or both, so they're not really
impressed either...
--
bruno desthuilliers
python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
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Re: Does IronPython indicate MS interest in dynamic languages?
Bengt Richter wrote: If there is to be an MSPython, how long 'til Mozilla FirePython? ;-) Regards, Bengt Richter 'Reclaim your runtime' I can't wait... -- -- Ola Natvig [EMAIL PROTECTED] infoSense AS / development -- http://mail.python.org/mailman/listinfo/python-list
Establishing connection SSH
Hello all, I have one computer and 1 server. I have login and password. The only way I can connect to server is using SSH protocol. I usually use Winscp3 to connect to the server (by providing login and password). Now I would like to connect to the server directly using python code. How can I establish connection ? Can I run something in the server and take the result back? Sincerely Yours, Pujo -- http://mail.python.org/mailman/listinfo/python-list
Re: Does IronPython indicate MS interest in dynamic languages?
On Apr 6, 2005 5:25 AM, Mike Rovner [EMAIL PROTECTED] wrote: Sun abandoned dynamic approach (Tcl) in favor of Java. Sun appear to be very interested in dynamic languages these days: http://www.tbray.org/ongoing/When/200x/2004/12/08/DynamicJava -- Cheers, Simon B, [EMAIL PROTECTED], http://www.brunningonline.net/simon/blog/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Web application toolkit recommendation?
You can also take a look at Karrigell (http://karrigell.sourceforge.net). You can write pure Python scripts or use a PHP-like syntax, and it is shipped with gadfly, an SQL engine, and with KirbyBase, a database engine which uses a Pythonic syntax. As for all the web frameworks, you can also work with the APIs available for almost any database under the sun -- http://mail.python.org/mailman/listinfo/python-list
Re: regexp weirdness (bug?)
it's line #159 here, but it did work! thanks. so it IS a bug? -- http://mail.python.org/mailman/listinfo/python-list
Re: Class, object question.
What I am wondering is if I have a 2nd init or something similar to create a vector. Such as what follows and if I can how do I go about implementing it? Class vector(point): def __init___(self, point1, point2): self.i = point2.get_x() - point1.get_x() self.j = point2.get_y() - point1.get_y() self.k = point2.get_z() - point1.get_z() def __init___(self, i, j, k): self.i = i self.j = j self.k = k That way I can define a vector either using 2 points or if I have the vector data itself? Well, what you want to do -- polymorphism of function signatures -- can be implemented like this: class vector_1(point) : def __init__(self,*args) : if len(args) == 2 and isinstance(args[0],point) and isinstance(args[1],point) : self.i = args[0].get_x() - args[1].get_x() self.j = args[0].get_y() - args[1].get_y() self.k = args[0].get_z() - args[1].get_z() elif len(args) == 3 : self.i,self.j,self.k = args else : raise ValueError, wrong arguments for instance initialization You can also find a nice implementation by Guido van Rossum using decorators at Artima (look for multimethods). However, I would prefer to avoid this sort of polymorphism because it only obfuscates your code. IMHO, there should be exactly one clear way to initialize an instance. Therefore, I suggest the provide a class method that serves as a special instance factory: class vector_2(point) : def __init__(self,i,j,k) : self.i = i self.j = j self.k = k @classmethod def difference(cls,point1,point2) : return cls( point1.get_x() - point2.get_x(), point1.get_y() - point2.get_y(), point1.get_z() - point2.get_z() ) # how to use it: point1 = Point(4,5,6) point2 = Point(1,2,3) vec = vector_2.difference(point1,point2) I wonder, why your vector inherits from point though. And of course, class is written lower case. Cheers, - harold - -- Es ist schon längst alles gesagt worden -- aber noch nicht von jedem. -- Karl Valentin -- http://mail.python.org/mailman/listinfo/python-list
Re: boring the reader to death (wasRe: Lambda: the Ultimate DesignFlaw
Ville Vainio wrote: Read up on list comprehensions and generator expressions. You'll see the terse side of Python (and genexps look kinda poetic too ;-). I am familiar with lc:s/genexps, I usually program in scheme which also has them (srfi-42). They're very nice and I use them a lot. -- http://mail.python.org/mailman/listinfo/python-list
THE GREATEST NEWS EVER !
http://www.print-it.blogspot.com The Greatest News Ever! -- http://mail.python.org/mailman/listinfo/python-list
Re: boring the reader to death (wasRe: Lambda: the Ultimate Design Flaw
Ville Vainio wrote: Boring code is code that numbs your senses with constant flow of boilerplate crap, memory management and redundant type declarations and general blah blah that you skip when you are trying to figure out what a piece of code does. The python code I've read so far has looked like that. Not type declarations, but lng class declarations. Also, Guido recently urged people to explicitly write recursions rather than to use reduce - which I thought was completely in line with what I've seen as python's goals: readability/understandability as more important than terseness/non-boringness. It's a code that you wish you could train a monkey to write for you while you go for lunch. Think C++ or Java. Oh, yes. C++ and Java can be super boring. C++ can also be pretty hard to understand - it's not all boilerplate. I'm not saying Python is always boring (maybe I've just been in an easily bored mood when I've read Python stuff), and I'm not saying that boring is always bad. Yesterday, I read some marketing prop describing a proprietary IDE (don't remember what language) as exciting, and I went Ugh, no thanks! Give me calm computing. And then I thought - wait: I just ranted about boringness on comp.lang.python. Can't boring and calm sometimes mean the same thing? -- http://mail.python.org/mailman/listinfo/python-list
ignoring keywords on func. call
Hi !
If I define 'f' like this
def f(a):
print a
then, the call with keywords
f(1, optional=2)
fails. I have to change 'f' to
def f(a, **kwrds):
print a
to ignore optional parameters.
BUT..
Q: Can you call 'f' with keywords that will be
ignored, without changing 'f's definition ?
I would like to avoid code like this:
k = {}
k['optional'] = 2
try:
f(1, **k)
except TypeError:
f(1)
Also, the problem is that I don't know if the TypeError
was caused by calling 'f' with keywords or somewhere
inside f.
You can also say that I need to specify optional parameters
on caller side (not called side).
BranoZ
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Re: boring the reader to death (wasRe: Lambda: the Ultimate Design Flaw
Sunnan == Sunnan [EMAIL PROTECTED] writes: Sunnan Ville Vainio wrote: Sunnan Also, Guido recently urged people to explicitly write Sunnan recursions rather than to use reduce - which I thought was Sunnan completely in line with what I've seen as python's goals: Sunnan readability/understandability as more important than Sunnan terseness/non-boringness. The problem w/ reduce is that it's not intuitive. You'll have to stop to think what the code w/ reduce does - effectively converting it to a normal loop (not recursion!) in your head. It's a net loss when you compare it to just reading an explicit loop as written in code. Sunnan Yesterday, I read some marketing prop describing a Sunnan proprietary IDE (don't remember what language) as Sunnan exciting, and I went Ugh, no thanks! Give me calm Sunnan computing. And then I thought - wait: I just ranted about Sunnan boringness on comp.lang.python. Can't boring and calm Sunnan sometimes mean the same thing? Not for me at least. 'Boring' implies a certain sense of frustration, not getting anywhere and generally feeling like you are wasting your time. Human attention is a limited resource, and being bored leads to loss of attention. -- Ville Vainio http://tinyurl.com/2prnb -- http://mail.python.org/mailman/listinfo/python-list
Re: ignoring keywords on func. call
Brano Zarnovican wrote:
Q: Can you call 'f' with keywords that will be
ignored, without changing 'f's definition ?
no.
I would like to avoid code like this:
k = {}
k['optional'] = 2
try:
f(1, **k)
except TypeError:
f(1)
why would you write code like this? what's the use case?
Also, the problem is that I don't know if the TypeError
was caused by calling 'f' with keywords or somewhere
inside f.
You can also say that I need to specify optional parameters
on caller side (not called side).
you can use reflection mechanisms to check the target function
signature, but I won't tell you how to do that until you show me
a reasonable use case ;-)
/F
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Re: regexp weirdness (bug?)
Sergey Schetinin wrote: it's line #159 here, but it did work! thanks. so it IS a bug? sure looks like one. please report it here: http://sourceforge.net/tracker/?group_id=5470atid=105470 /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Semi-newbie, rolling my own __deepcopy__
Michael Spencer wrote:
[EMAIL PROTECTED] wrote:
[snip]
Anyway, my present problem is that I want to make copies of
instances
of my own custom classes. I'm having a little trouble
understanding
the process. Not that I think that it matters -- but in case it
does,
I'll tell you that I'm running Python 2.3.4 on a Win32 machine.
[snip]
If you google for:
python __deepcopy__ cookbook
you will find a couple of examples of this method in use, among them:
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/259179
1 class deque(object):
2
3 def __init__(self, iterable=()):
4 if not hasattr(self, 'data'):
5 self.left = self.right = 0
6 self.data = {}
7 self.extend(iterable)
[...snip methods...]
8def __deepcopy__(self, memo={}):
9from copy import deepcopy
10result = self.__class__()
11memo[id(self)] = result
12result.__init__(deepcopy(tuple(self), memo))
13return result
HTH
Michael
Hi, Michael,
I was indeed finding code like this in my web searches, though not this
particular example. I'm glad that you cut out code that is irrelevant
to the deepcopy operation. Still, I want to understand what is going
on here, and I don't. I've numbered the lines in your example.
So, entering deepcopy, I encounter the first new concept (for me) on
line 10. We obtain the class/type of self. On line 11 we create a
dictionary item in memo, [id(self):type(self)]. So now I'm confused as
to the purpose of memo. Why should it contain the ID of the *original*
object?
Things get even stranger for me on line 12. Working from the inside of
the parentheses outward, an attempt is made to convert self to a tuple.
Shouldn't this generate a TypeError when given a complex, non-iterable
item like the deque class? I just tried running one of my programs,
which assigns the name x to one of my custom objects, and when I
execute tuple(x), a TypeError is what I get.
Anyway, I like what I think I see when you finally call __init__ for
the copied object, on lines 4-6. If __deepcopy__ calls __init__, then
the new deque object should already have a data attribute. So data
is only initialized if it doesn't already exist.
I do not understand whether the iterable variable, which appears on
lines 3 and 7, is relevant to the copying operation. Line 12 calls
__init__ with a single argument, not two, so iterable should be
declared as an empty tuple. Again I see what I think should generate a
TypeError on line 7, when an attempt is made to extend the non-sequence
object self with the iterable tuple.
Is there another section of the Python docs that will clarify all this
for me? I got hung up on all the static, public, etc. declarations
in Java early on. Python has taken me an awful lot farther, but
perhaps I'm hitting the conceptual wall again.
--
Rainforest laid low.
Wake up and smell the ozone,
Says man with chainsaw.
John J. Ladasky Jr., Ph.D.
--
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Re: boring the reader to death (wasRe: Lambda: the Ultimate Design Flaw
Sunnan: The python code I've read so far has looked like that. Not type declarations, but lng class declarations. What do you mean? Lots of repetitive self.variable=variable in the __init__ method? Use of classes when you would use closures? Or maybe you are comparing with CLOS classes, which are pretty slim, since the (multi)methods are defined outside them? Michele Simionato -- http://mail.python.org/mailman/listinfo/python-list
Re: ignoring keywords on func. call
Q: Can you call 'f' with keywords that will be ignored, without changing 'f's definition ? no. OK. Thank you for an answer. what's the use case? I have extended the dict class, so that my __getitem__ accepts an optional parameter class MyTree(dict): def __getitem__(self, key, **k): .. def lookup(self, seq): node = self for k in seq: node = node.__getitem__(k, someoption=True) lookup takes a sequence of keys to lookup in hierarchy of Tree nodes. But I would like lookup to work also on objects that are not subclasses of Tree. It has to work on any dict-like class. If a user defines a custom class, he will intuitively define __getitem__ like this: def MyNode(??): def __getitem__(self, key): .. I could check in 'lookup' if isinstance(node, Tree): node = node.__getitem__(k, someoption=True) else: node = node.__getitem__(k) But it still doesn't guarantee that __getitem__ accepts keywords. (What if somebody will extend the Tree class and overlook the definition of __getitem__ and define a classic one) BranoZ -- http://mail.python.org/mailman/listinfo/python-list
how to parse system functions output
Dear all,
I want to parse the system functions output
but I couldn't do it. Kindly assist me in this
task.
eg) bytesused = os.system('du -sh /Users/enmail')
if I print this bytesused variable the output of
bytesused variable is the below
14M /Users/enmail
0
Now From this Output I want only '14M I cannot split
this output by space. If anyone know regarding this
mail me ASAP
regards
Prabahar
Yahoo! India Matrimony: Find your life partner online
Go to: http://yahoo.shaadi.com/india-matrimony
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Harvestman install not working
Hi, I previously had Harvestman installed and working okay, but somehow the latest version won't install. I have Python23 installed. When I attempt to execute the py2exesetup.bat file (on Windows XP), I get: -- E:\zips\internet\utilities\HarvestMan-1.4\HarvestMan-1.4.tar\HarvestMan-1.4\Harv estManrem Batch file for creating py2exe executable for Harvestman usage: install.py [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...] or: install.py --help [cmd1 cmd2 ...] or: install.py --help-commands or: install.py cmd --help error: option --force-imports not recognized Press any key to continue . . . -- Any suggestions? Thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: A ClientForm Question
Hi, ClientForm and Mechanize like tools do not execute javascript . You will normally have to do them manually in your python code itself. In your case, if you have a button, which (and I assume) executes some javascript code that sets some hidden variable and/or changes the 'action' attribute of the form, you will have to change/assign those elements in your python code itself. ClientForm and mechanize can get tedious to use when one has a lot of JavaScript functionality in the form. Hope this answered your question... :-) regards, Satchit narke wrote: John J. Lee wrote, See second bullet point under Why does .click()ing on a button not work for me?. Thanks for you advice. However, after read through the FAQs, I have not managed to find a solution for my problem. I belive my button is coupled with some Java script which mess thing up and there is no a easy solution. Am I right? - narke -- http://mail.python.org/mailman/listinfo/python-list
formatting file
Hi, I am new to python hence posing this question. I have a file with the following format: test11.1-1 installed test11.1-1 update test22.1-1 installed test22.1-2 update I want the file to be formatted in the following way: test11.1-1 1.1-2 test22.1-1 2.1-2 How can I achieve this? I am stuck here. Thanks in advance. spj __ Yahoo! Messenger Show us what our next emoticon should look like. Join the fun. http://www.advision.webevents.yahoo.com/emoticontest -- http://mail.python.org/mailman/listinfo/python-list
Re: check interpreter version before running script
Peter Otten wrote: rbt wrote: Is there a recommended or 'Best Practices' way of checking the version of python before running scripts? I have scripts that use the os.walk() feature (introduced in 2.3) and users running 2.2 who get errors. Instead of telling them, 'Upgrade you Python Install, I'd like to use sys.version or some other way of checking before running. I like import os try: os.walk except AttributeError: # implement fallback No need to remember in which version the desired feature came to be. Peter Thanks for all the tips. I found this tip from Peter the best for my situation. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to detect windows shutdown
Programs that start at boot, run until shutdown and run in background all the time under Windows are good candidates for being turned into Windows Services. They respond to shutdown commands properly and can be fine-grained scheduled as well. For tutorial pick of a copy of Python Programming on Win32 (Hammond and Robinson) and use Mark Hammonds Python Windows extension library. Larry Bates Austin wrote: I wrote a program running on windows. I put the link of the program in Start up folder and let it executed minimized. Every time when I open the computer, my program will be running in system tray. But if the user would like to shutdown the computer, the OS will show an error about exception. At first, I think windows will terminate all processes when it shutdown. So, if python has the way to dectect shutdown process, I can kill the process in advance. Thanks a lot. -- http://mail.python.org/mailman/listinfo/python-list
Erroneous line number error in Py2.4.1 [Windows 2000+SP3]
For some reason Python 2.3.5 reports the error in the following program correctly: File C:\Temp\problem.py, line 7 SyntaxError: unknown decode error ..whereas Python 2.4.1 reports an invalid line number: File C:\Temp\problem.py, line 2 SyntaxError: unknown decode error - problem.py starts - # -*- coding: ascii -*- Foo bar # Ä is not allowed in ascii coding - problem.py ends - Does anyone have a clue what is going on? Without the encoding declaration both Python versions report the usual deprecation warning (just like they should be doing). My environment: Windows 2000 + SP3. BR, Timo -- http://mail.python.org/mailman/listinfo/python-list
Re: Lambda: the Ultimate Design Flaw
[Aahz] [François] Many of us are using Python today, week after week, year long. So let's be pragmatic. Python is what it became and now is. Let's not define it as a memory from the past nor as a futuristic dream. You're free to continue using 1.5.2. [...] Sure, of course. Yet, our friendly argument is sliding away from was it originally was. The point was about not asserting in this forum that Python has only one way to do it, because this is not true anymore. The principle has been, it may be back in some distant future, but now it is not. -- François Pinard http://pinard.progiciels-bpi.ca -- http://mail.python.org/mailman/listinfo/python-list
shebang in cross platform scripts
Haven't tested this on Windows yet... thought I'd ask here: Does the line below have any negative impact on Windows machines? I develop and test mostly on Unix, but my scripts are often used on Win systems too. #!/usr/bin/env python Many thanks, rbt -- http://mail.python.org/mailman/listinfo/python-list
Re: authentication in zope server Python
I'm sorry -- http://mail.python.org/mailman/listinfo/python-list
Re: shebang in cross platform scripts
On Apr 6, 2005 2:37 PM, rbt [EMAIL PROTECTED] wrote: Does the line below have any negative impact on Windows machines? I develop and test mostly on Unix, but my scripts are often used on Win systems too. #!/usr/bin/env python Nope. On Windows it's just a comment. -- Cheers, Simon B, [EMAIL PROTECTED], http://www.brunningonline.net/simon/blog/ -- http://mail.python.org/mailman/listinfo/python-list
Re: shebang in cross platform scripts
rbt wrote: Haven't tested this on Windows yet... thought I'd ask here: Does the line below have any negative impact on Windows machines? I develop and test mostly on Unix, but my scripts are often used on Win systems too. #!/usr/bin/env python Thanks to the # being the comment sign in python, it will be silently discarded by windows. -- Regards, Diez B. Roggisch -- http://mail.python.org/mailman/listinfo/python-list
Re: optparse and negative numbers as positional arguments
Grant Edwards wrote: On 2005-04-05, Tomi Silander [EMAIL PROTECTED] wrote: How is one supposed to give negative numbers as positional arguments when using optparse? ./mitvit.py -- -1.1 Thank you, this works. I saw it in the source, but apparently did not properly pay attention; all the args after -- are considered positional if I read this right. ts. -- http://mail.python.org/mailman/listinfo/python-list
Re: shebang in cross platform scripts
On Apr 6, 2005 9:37 AM, rbt [EMAIL PROTECTED] wrote: Haven't tested this on Windows yet... thought I'd ask here: Does the line below have any negative impact on Windows machines? I develop and test mostly on Unix, but my scripts are often used on Win systems too. #!/usr/bin/env python What the others have said already is true, that it will be ignored on windows, with one caveat. The shebang is interpreted by Apache if your script is a CGI script. So, if your script is a CGI, you will need to have a windows version and a nix version. Peace Bill Mill bill.mill at gmail.com -- http://mail.python.org/mailman/listinfo/python-list
Re: How to detect windows shutdown
Austin wrote: I wrote a program running on windows. I put the link of the program in Start up folder and let it executed minimized. Every time when I open the computer, my program will be running in system tray. But if the user would like to shutdown the computer, the OS will show an error about exception. Important missing information: is this a GUI program or a console program, and if it's a GUI program, what framework did you use to write it (wxPython, PyQt, other...)? Also, what is the exception that you got? (Always report the specific error: we can't guess what exception you got, and the answer could well point directly to a cause that is different than you think it is.) -Peter -- http://mail.python.org/mailman/listinfo/python-list
Resticted mode still active (error?)
I thought restricted mode had been removed from Python but it seems to be active for Python 2.3.5 +. I'm using the JEP product which allows integration of Java with Python (see http://jepp.sourceforge.net) via starting a Python interpreter in the same process as the JVM. This integrates with python via the C interface, allowing the user to 'eval' python code (amongst other features). It seems that since Python 2.3.5 any threads (using the threading module) created via code that has been evaluated through the jep.eval() interface (i.e.Python C interface )are executed in restricted mode and cannot, for example, create files. Code that is just evaled (i.e not in a subthread) thread has no restrictions. The error reported is: IOError: file() constructor not accessible in restricted mode (see http://sourceforge.net/forum/forum.php? thread_id=1247793forum_id=376782) - I've given a JEP specific example here. There seems to be a similar problem with mod_python (see http://www.modpython.org/pipermail/mod_python/2005- January/017129.html) Reading through the release notes for Python 2.3.5 I see: Bug #754449: threading.Thread will no longer mask exceptions raised during interpreter shutdown with another exception caused by attempting to output the initial exception. This fix also includes a backport of rev. 1.41 from HEAD. This might be the problem as it seems to involve the porting of 2.4 threading code back to the 2.3 tree. The error output is: Exception in thread Thread-1: Traceback (most recent call last): File C:\Python24\Lib\threading.py, line 442, in __bootstrap File string, line 5, in run IOError: file() constructor not accessible in restricted mode 2.4.1c1 (#63, Mar 10 2005, 10:36:41) [MSC v.1310 32 bit (Intel)] Creating file from main thread... Done Creating file from sub thread... Done Has anyone got any ideas about this? Thanks in advance, Max -- http://mail.python.org/mailman/listinfo/python-list
Re: how to parse system functions output
praba kar wrote:
eg) bytesused = os.system('du -sh /Users/enmail')
if I print this bytesused variable the output of
bytesused variable is the below
14M /Users/enmail
0
It's unlikely this is the contents of bytesused,
because os.system() does not return the output
of the program that is run, it returns only the
exit value. (See the doc.) The 14M ... part
is actually being printed by the du command
as it runs. bytesused contains only the 0
that you show above.
Now From this Output I want only '14M I cannot split
this output by space. If anyone know regarding this
mail me ASAP
You are looking for either os.popen() or the newer,
more flexible subprocess module (available in
Python 2.4). Again, check the docs for details and
examples for both of these.
Basically you would do this:
result = os.popen('du -sh /Users/enmail').read()
# now parse result...
-Peter
--
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Re: formatting file
SPJ wrote: I have a file with the following format: test11.1-1 installed test11.1-1 update test22.1-1 installed test22.1-2 update I want the file to be formatted in the following way: test11.1-1 1.1-2 test22.1-1 2.1-2 Please verify that you made an error about the second version value for test1: the before (1.1-1) and the after (1.1-2) values do not match. Also, is it fair to assume the file is guaranteed to contain even numbers of lines, always with both an installed line and an update line, and that the order is as shown above, etc... in other words, how robust does the solution need to be? (You might also show a little bit of your own attempt, if nothing else so we don't get the idea this is homework that we're doing for you. :-) ) -Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: Gnuplot.py and, _by far_, the weirdest thing I've ever seen on my computer
Ok yall, here's my summary. Thanks again for all the help. Most importantly, upgrading to gnuplot-py 1.7 fixes this problem. In gnuplot-py 1.6, this is the bottom line... Does not fix: Gnuplot.GnuplotOpts.prefer_fifo_data = 0 Fixes: Gnuplot.GnuplotOpts.prefer_inline_data = 1 Fixes: (placed between setting output and plot) while 1: if os.path.isfile(myGraph.png): break time.sleep(1) As for matplotlib, I checked it out. Looks amazing! I really, really like what demos I tried. HOWEVER, I could not find a good way to do smoothing. I like the gnuplot bezier smoothing. This wouldn't be the hardest thing in the world to code, but I was a little disappointed. If yall have any ideas, bring em on! :) -- http://mail.python.org/mailman/listinfo/python-list
Re: formatting file
SPJ wrote: Hi, I am new to python hence posing this question. I have a file with the following format: test11.1-1 installed test11.1-1 update test22.1-1 installed test22.1-2 update I want the file to be formatted in the following way: test11.1-1 1.1-2 test22.1-1 2.1-2 How can I achieve this? I am stuck here. I suspect you need to a) remove the error in your specification (should there not be a 1.1-2 somewhere in the input) and/or b) explain the exact intent in a little more detail - we aren't psychic, and while the problem may be very obvious to you, we aren't inside your head with it! regards Steve -- Steve Holden+1 703 861 4237 +1 800 494 3119 Holden Web LLC http://www.holdenweb.com/ Python Web Programming http://pydish.holdenweb.com/ -- http://mail.python.org/mailman/listinfo/python-list
(no subject)
#! rnews 4875 Newsgroups: comp.lang.python Path: news.xs4all.nl!newsspool.news.xs4all.nl!transit.news.xs4all.nl!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!nntp.abs.net!attws2!ip.att.net!NetNews1!xyzzy!nntp From: Harry George [EMAIL PROTECTED] Subject: Re: Best editor? X-Nntp-Posting-Host: cola2.ca.boeing.com Content-Type: text/plain; charset=us-ascii Message-ID: [EMAIL PROTECTED] User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3 Lines: 106 Sender: [EMAIL PROTECTED] Organization: The Boeing Company References: [EMAIL PROTECTED] Mime-Version: 1.0 Date: Wed, 6 Apr 2005 14:22:57 GMT Xref: news.xs4all.nl comp.lang.python:371122 ChinStrap [EMAIL PROTECTED] writes: When not using the interactive prompt, what are you using? I keep hearing everyone say Emacs, but I can't understand it at all. I keep trying to learn and understand why so many seem to like it because I can't understand customization even without going through a hundred menus that might contain the thing I am looking for (or I could go learn another language just to customize!). Personally I like SciTE, it has everything I think a midweight editor should: code folding, proper python support, nice colors out of the box, hotkey access to compile (I'm sure emacs does this, but I couldn't figure out for the life of me how), etc. Opinions on what the best is? Or reading I could get to maybe sway me to Emacs (which has the major advantage of being on everyone's system). The key (as others have said) is to know your editor and be effective with it. As long as it can handle ASCII, does autoindent, and knows tab-is-4-chars, then it is a viable choice. Since you asked specifically about emacs, and whether or not it is worthwhile... I've used emacs for 15 years, and am still learning useful new tricks at a rate of about one per 6 months. But I've also found that the essentials can be taught in a 2 hour session and mastered in about 2 weeks of use. I've taught dozens of people using this Essential Emacs approach. We find that emacs is for people who will be doing serious editing all day long (e.g., programmers). I like that comment from another poster: Emacs is a good place to live, but I wouldn't want to visit there. For people who will just be editing an occassional file (and no python code), we recommend notepad or nedit. Now then, how do we use emacs? 1. Proper setup is essential. Assuming you have python-mode.el and .elc in emacs's program-modes dir, then your .emacs needs: ;---python--- (load python-mode) (setq auto-mode-alist (cons '(\\.py$ . python-mode) auto-mode-alist)) (setq interpreter-mode-alist (cons '(python . python-mode) interpreter-mode-alist)) (autoload 'python-mode python-mode Python editing mode. t) (add-hook 'python-mode-hook 'turn-on-font-lock) (setq python-mode-hook 'python-initialise) (defun python-initialise () (interactive) (setq default-tab-width 4) (setq indent-tabs-mode nil) ) 2. I almost never use the interactive prompt. There are people here who do, but as soon as the script is more than a couple lines long, it takes longer to reenter the code (even copy-and-paste) than to edit-save-run a dummy batch script. When I'm doing Extreme Programming with such people, I insist on using a stopwatch and checking which approach is more efficient -- they usually come over to my approach. 3. I run emacs with split windows: a) Edit the working code b) Edit the unittest code c) Run a shell script, where I (re)run the go_test script by doing alt-p ret In another frame (same emacs process, different frame) I keep the oracle (known good) and test outputs in split windows, and maybe do ediff-buffers on them if the deltas are not obvious. For each module under consideration (view or edit), I use a separate emacs process in a similar manner. In normal work, that means 1-4 emacs processes running, each with its own shell and own test cycles. 4. Elsewhere I'm running emacs rmail all day, and run emacs gnus several times a day (like now). 5. When I do Extreme Programming, the other author(s) tend to be using emacs, vim, or nedit. We don't let people use notepad for python becuause it doesn't know proper formatting. IDE's tend to want to own the whole show, which makes cross-tool Extreme Programming a pain. As long as the other programmers have set their editors for auto-indention and tab-is-4-chars, then we get along fine. [I do notice a sizeable delay when vim people search for the appropriate shell windows, instead of having them in a (joined-at-the-hip) split window. This has more to do with bookkeeping than with editors per se, but it is a data point.] 6. On IDE's and code-completion: If you are going to be typing the same thing over and over, why not use a function, or maybe code generation? -- [EMAIL PROTECTED] 6-6M21 BCA CompArch Design Engineering Phone: (425) 294-4718 -- http://mail.python.org/mailman/listinfo/python-list
Re: optparse and negative numbers as positional arguments
On 2005-04-06, Tomi Silander [EMAIL PROTECTED] wrote: Grant Edwards wrote: On 2005-04-05, Tomi Silander [EMAIL PROTECTED] wrote: How is one supposed to give negative numbers as positional arguments when using optparse? ./mitvit.py -- -1.1 this works. Yes, I know. :) I saw it in the source, but apparently did not properly pay attention; all the args after -- are considered positional if I read this right. That's the way it's traditionally been done. I just assumed that optparse did it that way, and when I tried it with optparse it seemed to work the same. It's not mentioned in the optparse documentation anywhere (it probably should be). -- Grant Edwards grante Yow! .. are the STEWED at PRUNES still in the HAIR visi.comDRYER? -- http://mail.python.org/mailman/listinfo/python-list
Re: Semi-newbie, rolling my own __deepcopy__
[EMAIL PROTECTED] wrote:
Michael Spencer wrote:
[EMAIL PROTECTED] wrote:
[snip]
Anyway, my present problem is that I want to make copies of
instances
of my own custom classes. I'm having a little trouble
understanding
the process. Not that I think that it matters -- but in case it
does,
I'll tell you that I'm running Python 2.3.4 on a Win32 machine.
[snip]
If you google for:
python __deepcopy__ cookbook
you will find a couple of examples of this method in use, among them:
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/259179
1 class deque(object):
2
3 def __init__(self, iterable=()):
4 if not hasattr(self, 'data'):
5 self.left = self.right = 0
6 self.data = {}
7 self.extend(iterable)
[...snip methods...]
8def __deepcopy__(self, memo={}):
9from copy import deepcopy
10result = self.__class__()
11memo[id(self)] = result
12result.__init__(deepcopy(tuple(self), memo))
13return result
So, entering deepcopy, I encounter the first new concept (for me) on
line 10. We obtain the class/type of self. On line 11 we create a
dictionary item in memo, [id(self):type(self)]. So now I'm confused as
to the purpose of memo. Why should it contain the ID of the *original*
object?
Note that you obtain *and then call* the class/type of self:
py i, s = 100, 'string'
py i.__class__, s.__class__
(type 'int', type 'str')
py i.__class__(), s.__class__()
(0, '')
So you've created a new object calling the constructor with no
arguments. So 'result' is a new instance of the class.
Things get even stranger for me on line 12. Working from the inside of
the parentheses outward, an attempt is made to convert self to a tuple.
Shouldn't this generate a TypeError when given a complex, non-iterable
item like the deque class? I just tried running one of my programs,
which assigns the name x to one of my custom objects, and when I
execute tuple(x), a TypeError is what I get.
tuple(x) works on any object that defines __iter__:
py class C(object):
... def __iter__(self):
... yield 1
... yield 2
... yield 5
...
py tuple(C())
(1, 2, 5)
So line 12 is making a tuple of the values in the object, and then
calling result's __init__ again, this time with (a deepcopied) tuple as
an argument. This adds the content to the previously uninitialized object.
HTH,
STeVe
--
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Re: Resticted mode still active (error?)
Is there a script that causes this problem, without using mod_python or jepp? If so, please attach it to the sourceforge bug. http://sourceforge.net/tracker/index.php?func=detailaid=1163563group_id=5470atid=105470 pgpiWdvwwFmcD.pgp Description: PGP signature -- http://mail.python.org/mailman/listinfo/python-list
Re: formatting file
SPJ wrote:
I am new to python hence posing this question.
I have a file with the following format:
test11.1-1 installed
test11.1-1 update
test22.1-1 installed
test22.1-2 update
I want the file to be formatted in the following way:
test11.1-1 1.1-2
test22.1-1 2.1-2
For data that has a clear tree structure with keys, a quick solution
is often a dictionary, or dictionary of dictionaries. The setdefault
idiom below is very handy for this sort of thing. The test name
test1
is key to the top dict. The operation update is the key to the sub
dictionary. Setdefault returns the dict for the specified test, or a
new dict if there is none.
.d={}
.for line in open('tests.txt'):
.test,version,operation = l.split()
.d.setdefault(test,{})[operation] = version
.for test,d in d.items():
.print test, d['installed'], d['update']
[BWT, your given test data appears to have been
wrong test11.1-1 update; please be careful not to waste
people's time who try to help...]
-- George
--
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Re: shebang in cross platform scripts
Hi All-- Simon Brunning wrote: On Apr 6, 2005 2:37 PM, rbt [EMAIL PROTECTED] wrote: Does the line below have any negative impact on Windows machines? I develop and test mostly on Unix, but my scripts are often used on Win systems too. #!/usr/bin/env python Nope. On Windows it's just a comment. It works fine using cygwin, uwin, mks and pdksh, all available for Windows. Google is your friend. Symbolic links also work under uwin (don't know for sure about the others). That means you can install a link in /usr/bin to whereever python lives, and expect #!/usr/bin/python to work just fine. Metta, Ivan -- Ivan Van Laningham God N Locomotive Works http://www.andi-holmes.com/ http://www.foretec.com/python/workshops/1998-11/proceedings.html Army Signal Corps: Cu Chi, Class of '70 Author: Teach Yourself Python in 24 Hours -- http://mail.python.org/mailman/listinfo/python-list
Re: formatting file
SPJ wrote: Hi, I am new to python hence posing this question. I have a file with the following format: test11.1-1 installed test11.1-1 update test22.1-1 installed test22.1-2 update I want the file to be formatted in the following way: test11.1-1 1.1-2 test22.1-1 2.1-2 How can I achieve this? I am stuck here. py import itertools as it py for line1, line2 in it.izip(f, f): ... line1, line2 = [line.split() for line in [line1, line2]] ... print '\t'.join(line1[:2] + line2[1:2]) ... test1 1.1-1 1.1-2 test2 2.1-1 2.1-2 where f is the file containing your data. I assumed it looked like: py import StringIO as strio py f = strio.StringIO(\ ... test11.1-1 installed ... test11.1-2 update ... test22.1-1 installed ... test22.1-2 update ... ) STeVe -- http://mail.python.org/mailman/listinfo/python-list
Re: regexp weirdness (bug?)
* Fredrik Lundh wrote: Sergey Schetinin wrote: it's line #159 here, but it did work! thanks. so it IS a bug? sure looks like one. please report it here: http://sourceforge.net/tracker/?group_id=5470atid=105470 done :) nd -- Das Verhalten von Gates hatte mir bewiesen, dass ich auf ihn und seine beiden Gefhrten nicht zu zhlen brauchte -- Karl May, Winnetou III Im Westen was neues: http://pub.perlig.de/books.html#apache2 -- http://mail.python.org/mailman/listinfo/python-list
Re: Best editor?
[Harry George] 5. When I do Extreme Programming, the other author(s) tend to be using emacs, vim, or nedit. [...] Speaking of, when everybody uses Emacs, there is a way for Emacs for allowing many users, each on a different networked machine, all on the very same buffer, simultaneously. This sharing has been useful to us in a number of occasions, and we had scripts for quickly initiating such collaboration at any time (resolving `xauth' matters, for example). Note that it requires a lot of confidence between the collaborating users, as they all have extended powers on the editing session. -- François Pinard http://pinard.progiciels-bpi.ca -- http://mail.python.org/mailman/listinfo/python-list
Re: Does IronPython indicate MS interest in dynamic languages?
Bengt Richter wrote: If there is to be an MSPython, how long 'til Mozilla FirePython? ;-) Mexico has already designed the flag for that, I think. --Scott David Daniels [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: Lambda: the Ultimate Design Flaw
Aahz wrote: You just can't have your cake and eat it, too. I've always wondered about this turn of phrase. I seldom eat a cake at one sitting. -Scott David Daniels [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: Lambda: the Ultimate Design Flaw
On Apr 6, 2005 4:42 PM, Scott David Daniels [EMAIL PROTECTED] wrote: I've always wondered about this turn of phrase. I seldom eat a cake at one sitting. Clearly you're just not trying. ;-) -- Cheers, Simon B, [EMAIL PROTECTED], http://www.brunningonline.net/simon/blog/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Calling a Perl Module from Python
On Apr 6, 2005 8:23 AM, gf gf [EMAIL PROTECTED] wrote: I've recently made the switch. Wow, is Python great! One thing which I haven't been able to do is replace Perl's great lib collection (HTML::Parser, for instance, can do a lot that Soup just can't). You've just discovered the only limitation of Python (in my view) - it doesn't have a module repository to rival CPAN. AFAIK, there isn't any reliable way to call Perl modules from Python. -- Swaroop C H Blog: http://www.swaroopch.info Book: http://www.byteofpython.info -- http://mail.python.org/mailman/listinfo/python-list
Re: Decorator Base Class: Needs improvement.
Bengt Richter wrote: On 5 Apr 2005 19:28:55 -0700, El Pitonero [EMAIL PROTECTED] wrote: Scott David Daniels wrote: Ron_Adam wrote: ... def tweakdoc(name): def decorator(function): function.__doc__ = 'Tweak(%s) %r' % (name, function.__doc__) return function return decorator What is confusing us about what you write is that you are referring to tweakdoc as a decorator, when it is a function returning a decorator. Decorator factory would be a shorter name for a function returning a decorator. True, but tweakdoc doesn't have to be a function, so IMO we need a better name for the @-line, unless you want to use many various specific names like factory. E.g., There are two things: (1) The tweadoc object in the example, which no doubt can be called a decorator factory. (2) The @-line, which you called a decorator expression and that's fine with me. My preference would be something like the decorator header. A more clear statement would be something like: a decorator header expression or the expression in the decorator header, though your proposed decorator expression would be clear enough, too. I was addressing (1). You jumped in with (2), which I was aware of and was not dissenting. -- http://mail.python.org/mailman/listinfo/python-list
Re: Decorator Base Class: Needs improvement.
Bengt Richter wrote: @deco.one def foo(): pass Ok, now what do you call this @-line? Freaky decorator factory invocation? Decoratoriferous expression? ;-) This one has a certain je ne sais quoi ;-), but I'd call deco.one the decorator function (since it _must_ evaluate to a function), and if it needs more clarity, of your non-oderiferous proposals, I'd take: Decorator expression for short? --Scott David Daniels [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: ignoring keywords on func. call
Brano Zarnovican wrote: But it still doesn't guarantee that __getitem__ accepts keywords. (What if somebody will extend the Tree class and overlook the definition of __getitem__ and define a classic one) I deem it more likely that that same somebody will not overlook it and dump your Tree class altogether for not adhering to a sensible convention. Why don't you just introduce a getitem_ex(self, key, all the options you like) method and define __getitem__() in terms of that method? E. g. def getitem_ex(self, key, some_option=None): # ... def __getitem__(self, key): return self.getitem_ex(key, some_option=True) Your docs could then recommend to override getitem_ex() instead of __getitem__() and you and somebody would live happily ever after (*). Peter (*) or at least without calling each other names right from the start. -- http://mail.python.org/mailman/listinfo/python-list
Re: unittest vs py.test?
py.test is awesome, but there is one slight flaw in it. It produces to much output. All I want to see when all tests pass is All X passes succeded! (or something similar). py.test's output can be distracting. -- mvh Björn -- http://mail.python.org/mailman/listinfo/python-list
Re: Calling a Perl Module from Python
Swaroop C H wrote: AFAIK, there isn't any reliable way to call Perl modules from Python. pyperl. pyperl. pyperl. +10 on making this a standard module for embrace+extend reasons *and* because perl is not that bad after all. jf -- http://mail.python.org/mailman/listinfo/python-list
Re: Best editor?
Well I would be more than willing to learn Emacs if it does all these things you speak of, but really I can't get started because the default scheme is so friggin ugly it isn't funny. Anyone want to send me a configuration setup with Python in mind, and decent colors? -- http://mail.python.org/mailman/listinfo/python-list
Re: HTML editor component?
You could try the (very) simple HTML editor I use for my CM project. It can only handle B, I, U and A, but then again, it was never meant to do more. It's written in wxPython, based on Scintilla and can probably be extended to fit your needs. You can find it here: http://sourceforge.net/project/showfiles.php?group_id=72786package_id=138707 BR /Johan Lindberg -- http://mail.python.org/mailman/listinfo/python-list
Re: Question about the Python Cookbook: How much of this is new?
Robert Kern [EMAIL PROTECTED] writes: So yeah, buy it. Seconded. My copy arrived from ORA yesterday and I'm still giddy with delight. Even if you have the first edition, the second includes a lot of recipes that leverage or demonstrate the new features in 2.3 and 2.4. Nick -- # sigmask (lambda deprecation version) 20041028 || feed this to a python print ''.join([chr(ord(x)-1) for x in 'Ojdl!Wbshjti!=ojdlAwbshjti/psh?']) -- http://mail.python.org/mailman/listinfo/python-list
Re: Establishing connection SSH
Try paramiko: http://www.lag.net/paramiko/ Grig -- http://mail.python.org/mailman/listinfo/python-list
Re: unittest vs py.test?
[EMAIL PROTECTED] wrote: py.test is awesome, but there is one slight flaw in it. It produces to much output. All I want to see when all tests pass is All X passes succeded! (or something similar). py.test's output can be distracting. I agree. -- http://mail.python.org/mailman/listinfo/python-list
Re: boring the reader to death (wasRe: Lambda: the Ultimate Design Flaw
Sunnan wrote:
Aahz wrote:
(snip)
print foo is, foo
Is the space added automatically? (Like awk does, if you add a comma.)
Yes. But you can also format it how you like:
print foo is %s and that's a good news, my friends % foo
--
bruno desthuilliers
python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
--
http://mail.python.org/mailman/listinfo/python-list
Using weakrefs instead of __del__
I know __del__ can't be relied on to do cleanup, so I'm thinking of using a globally reachable weakref to do the job, like so: import weakref class Foo: def __init__(self, *args, **kwargs): self.__realfoo = RealFoo(self, *args, **kwargs) def blah(self): return self.__realfoo.blah() class RealFoo: refs = set() def __init__(self, front): self.refs.add(weakref.ref(front, self.cleanup)) def blah(self): print Blah! def cleanup(self, ref): print Doing cleanup self.refs.remove(ref) Is there any reason why this wouldn't work? Can it be used as a general replacement for anything that needs __del__? Even in Jython or other alternative implementations? Some issues I know about: * The weakref must be globally reachable (as I do with the above code) to make sure it doesn't get deleted at the same time Foo does, because python would not call the callback if that were the case. * I can't use any getattr tricks to wrap .blah() because Foo().blah() would only use a method bound to RealFoo, thus allowing Foo to be deallocated and .cleanup() to be called before the method itself is. Unfortunately my metaclass-fu is too weak to figure out something without that problem. * I've no idea what will happen when the interpreter exits, but I don't imagine it would matter much for most uses. -- Adam Olsen, aka Rhamphoryncus -- http://mail.python.org/mailman/listinfo/python-list
Re: shebang in cross platform scripts
On Apr 6, 2005 11:06 AM, Ivan Van Laningham [EMAIL PROTECTED] wrote: Hi All-- Simon Brunning wrote: On Apr 6, 2005 2:37 PM, rbt [EMAIL PROTECTED] wrote: Does the line below have any negative impact on Windows machines? I develop and test mostly on Unix, but my scripts are often used on Win systems too. #!/usr/bin/env python Nope. On Windows it's just a comment. It works fine using cygwin, uwin, mks and pdksh, all available for Windows. Google is your friend. Symbolic links also work under uwin (don't know for sure about the others). That means you can install a link in /usr/bin to whereever python lives, and expect #!/usr/bin/python to work just fine. This works in cygwin as well; I didn't mention cygwin since the OP seemed to be asking about windows distribution, but it's a good point. Peace Bill Mill -- http://mail.python.org/mailman/listinfo/python-list
Problem with access to shared memory(W2K) / ORIGINALLY (win32) speedfan api control
Background information:
-
in order to monitor mainboard sensory data
as fan speeds, temperatures, applications
like SpeedFan http://www.almico.com/speedfan.php
or MBM http://mbm.livewiredev.com/
can be used.
Both of the mentioned apps expose data got
from the hardware in a shared memory area.
The goal to achieve:
---
is to supervise the motherboard sensory
data from within a Python script
The approach:
---
access to the shared memory area
exposed by motherboard hardware
querying apps from Python script.
The problem:
-
the below listed script code returns
always same values, what
leads to the conclusion, that something
is going wrong.
Can anyone help?
Thanks in advance
Claudio
The code
-
I use is provided also here:
http://www.codecomments.com/Python/message430495.html
http://mail.python.org/pipermail/python-list/2005-March/271853.html
(the mmap part of it doesn't work at all)
from ctypes import *
class Buffer(Structure):
# just to see if any useful data can be acquired
_fields_ = [
(Data0, c_longlong)
,(Data1, c_longlong)
,(Data2, c_longlong)
,(Data3, c_longlong)
,(Data4, c_longlong)
,(Data5, c_longlong)
,(Data6, c_longlong)
,(Data7, c_longlong)
,(Data8, c_longlong)
,(Data9, c_longlong)
,(DataA, c_longlong)
,(DataB, c_longlong)
,(DataC, c_longlong)
,(DataD, c_longlong)
,(DataE, c_longlong)
,(DataF, c_longlong)
]
szName = c_char_p(SFSharedMemory_ALM) # SpeedFan
szName = c_char_p($M$B$M$5$S$D$)# MBM
# szName = c_char_p(blabla) # not existing shared memory
FILE_MAP_ALL_ACCESS = 0xF001F
FALSE = 0
hMapObject = windll.kernel32.OpenFileMappingA(
FILE_MAP_ALL_ACCESS
,FALSE
,szName
)
if (hMapObject == 0):
print Could not open file mapping object
raise WinError()
pBuf = windll.kernel32.MapViewOfFile(
hMapObject
,FILE_MAP_ALL_ACCESS
,0
,0
,0
)
if (pBuf == 0):
print Could not map view of file
raise WinError()
else:
print repr(pBuf)
print repr(hMapObject)
pBuf_str = cast(pBuf, c_char_p)
print repr(pBuf_str.value)
print repr(pBuf_str)
pBuf_buf = cast(pBuf, Buffer)
print
print
print repr(pBuf_buf)
print
print repr(pBuf_buf.Data0)
print repr(pBuf_buf.Data1)
print repr(pBuf_buf.Data2)
print repr(pBuf_buf.Data3)
print repr(pBuf_buf.Data4)
print repr(pBuf_buf.Data5)
print repr(pBuf_buf.Data6)
print repr(pBuf_buf.Data7)
print repr(pBuf_buf.Data8)
print repr(pBuf_buf.Data9)
print repr(pBuf_buf.DataA)
print repr(pBuf_buf.DataB)
print repr(pBuf_buf.DataC)
print repr(pBuf_buf.DataD)
print repr(pBuf_buf.DataE)
print repr(pBuf_buf.DataF)
#:if/else (pBuf == 0)
windll.kernel32.UnmapViewOfFile(pBuf)
windll.kernel32.CloseHandle(hMapObject)
The output
--
is always the same:
13107200
80
''
c_char_p('')
__main__.Buffer object at 0x007E3570
13107200L
0L
0L
0L
0L
0L
0L
0L
0L
0L
0L
0L
0L
0L
0L
0L
--
http://mail.python.org/mailman/listinfo/python-list
richcmpfunc semantics
Hi all, I want to implement rich comparision in an extension class. Problem is I cannot find good documentation of the richcmpfunc semantics. Given the signature richcmpfunc compare(PyObject *,PyObject, int); I supposed the two objects passed are the ones to be compared. What is the meaning of the integer argument? Does it specify the kind of comparision operator (e.g. __eq__ or __le__), and if so, how? What is my richcmpfunc supposed to return? 0 or 1 indicating False or True? What has to be done, if the function is invoked for an operator I don't want to define? Maybe there is some good documentation available, but I cannot find it. So, any references or help is appreciated. Cheers, - harold - -- Scientist are very good in answering the questions they choose to answer. -- Richard Alley -- http://mail.python.org/mailman/listinfo/python-list
Re: (win32) speedfan api control
I have got the specs for SpeedFan from the SpeedFan author :-) , but ... inbetween I found, that full specs of the shared memory access to fan speeds, board, CPU temperature data are also exposed by the MBM application http://mbm.livewiredev.com and already published online (including C, VB, Delphi code examples). but ... I failed to get the data into a Python script :-( . For details see my other Problem with access to shared memory(W2K) / ORIGINALLY (win32) speedfan api control posting. Claudio Almico [EMAIL PROTECTED] schrieb im Newsbeitrag news:[EMAIL PROTECTED] Claudio Grondi [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED]... your script works ok on my W2K box :-). It makes me curious if I can get also the temperatures into Python script for further processing as easy as the setting of the checkbox is done? (I have not much experience with this kind of programming yet) May I ask how did you get the TJvXPCheckbox and the other values necessary to access the program GUI ? (as I can see, there is no source code of SpeedFan available) ? SpeedFan publishes a Shared Memory area. Drop SpeedFan's author (me :-)) an email to get its specs. -- http://mail.python.org/mailman/listinfo/python-list
Re: formatting file
SPJ wrote: test11.1-1 installed test11.1-1 update test22.1-1 installed test22.1-2 update I want the file to be formatted in the following way: test11.1-1 1.1-2 test22.1-1 2.1-2 The following program expects a sorted input file: import itertools from operator import itemgetter def pivot(infile, outfile, getkey=itemgetter(0), getvalue=itemgetter(1), sep=\t): if not hasattr(infile, read): infile = file(infile) if not hasattr(outfile, write): outfile = file(outfile, w) records = (line.split() for line in infile) for key, items in itertools.groupby(records, getkey): out_record = [key] out_record.extend(getvalue(item) for item in items) print outfile, sep.join(out_record) if __name__ == __main__: import sys infile, outfile = sys.argv[1:] if infile == -: infile = sys.stdin if outfile == -: outfile = sys.stdout pivot(infile, outfile) -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Cookbook, 2'nd. Edition is published
Larry Bates wrote: I received my copy on Friday (because I was a contributor). I wanted to thank Alex, Anna, and David for taking the time to put this together. I think it is a GREAT resource, especially for beginners. This should be required reading for anyone that is serous about learning Python. +1. The Python Cookbook is really great, and being included in the contributors, even if for a little tiny idea that got heavily refactored, feels wonderful. I'm really grateful to the python community. -- Ciao, Matteo -- http://mail.python.org/mailman/listinfo/python-list
Re: Semi-newbie, rolling my own __deepcopy__
[EMAIL PROTECTED] wrote: ... I see Steve Bethard has answered most of the points in your last eMail On line 11 we create a dictionary item in memo, [id(self):type(self)]...So now I'm confused as to the purpose of memo. Why should it contain the ID of the *original* object? No, you create memo[id(self):type(self)()] i.e., a mapping of the old object to a new object of the same type. This new object does not yet contain the data of the old one, because you called its __init__ method with no arguments. BTW, as I mentioned in a previous comment, I believe this would be more plainly written as type(self).__new__(), to emphasize that you are constructing the object without initializing it. (There is a explanation of __new__'s behaviour at http://www.python.org/2.2/descrintro.html#__new__). This works only for new-style classes (also explained in the same reference). For old-style 'classic' classes you would use new types.InstanceType ... Is there another section of the Python docs that will clarify all this for me? I got hung up on all the static, public, etc. declarations in Java early on. Python has taken me an awful lot farther, but perhaps I'm hitting the conceptual wall again. I assume you have seen http://docs.python.org/lib/module-copy.html which explains this topic and, in particular, why the memo dict is passed around. Hang in there. It's not an easy topic, and this example contains several subtleties as you have discovered. If you want further help, why not post the actual class you are working with, and your __deepcopy__ attempt. It would be much easier to react to something concrete than a general howto. Michael -- http://mail.python.org/mailman/listinfo/python-list
Re: A ClientForm Question
narke [EMAIL PROTECTED] writes: John J. Lee wrote, See second bullet point under Why does .click()ing on a button not work for me?. Thanks for you advice. However, after read through the FAQs, I have not managed to find a solution for my problem. I belive my button is coupled with some Java script which mess thing up and there is no a easy solution. Am I right? Yes. John -- http://mail.python.org/mailman/listinfo/python-list
Re: how to parse system functions output
Or if you run 2.4 you can use subprocess -- http://mail.python.org/mailman/listinfo/python-list
Re: Harvestman install not working
Hi Latest version of py2exe does not support the option --force-imports anymore I think. You can edit the .bat file to remove that option. It should work. -Anand -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem with access to shared memory(W2K) / ORIGINALLY (win32) speedfan api control
Claudio Grondi [EMAIL PROTECTED] writes: Background information: - in order to monitor mainboard sensory data as fan speeds, temperatures, applications like SpeedFan http://www.almico.com/speedfan.php or MBM http://mbm.livewiredev.com/ can be used. Both of the mentioned apps expose data got from the hardware in a shared memory area. The goal to achieve: --- is to supervise the motherboard sensory data from within a Python script The approach: --- access to the shared memory area exposed by motherboard hardware querying apps from Python script. For the mistake you made see below, hope that helps. For the general way to solve this problem you should know that you can access a shared memory area with a certain name also with Python's mmap module, although that is probably not documented very good. There was a recipe posted a few days ago which showed different ways to acces shared memory, with or without ctypes. The problem: - the below listed script code returns always same values, what leads to the conclusion, that something is going wrong. Can anyone help? Thanks in advance Claudio The code - I use is provided also here: http://www.codecomments.com/Python/message430495.html http://mail.python.org/pipermail/python-list/2005-March/271853.html (the mmap part of it doesn't work at all) from ctypes import * class Buffer(Structure): # just to see if any useful data can be acquired _fields_ = [ (Data0, c_longlong) ,(Data1, c_longlong) ,(Data2, c_longlong) ,(Data3, c_longlong) ,(Data4, c_longlong) ,(Data5, c_longlong) ,(Data6, c_longlong) ,(Data7, c_longlong) ,(Data8, c_longlong) ,(Data9, c_longlong) ,(DataA, c_longlong) ,(DataB, c_longlong) ,(DataC, c_longlong) ,(DataD, c_longlong) ,(DataE, c_longlong) ,(DataF, c_longlong) ] szName = c_char_p(SFSharedMemory_ALM) # SpeedFan szName = c_char_p($M$B$M$5$S$D$)# MBM # szName = c_char_p(blabla) # not existing shared memory FILE_MAP_ALL_ACCESS = 0xF001F FALSE = 0 hMapObject = windll.kernel32.OpenFileMappingA( FILE_MAP_ALL_ACCESS ,FALSE ,szName ) if (hMapObject == 0): print Could not open file mapping object raise WinError() pBuf = windll.kernel32.MapViewOfFile( hMapObject ,FILE_MAP_ALL_ACCESS ,0 ,0 ,0 ) if (pBuf == 0): print Could not map view of file raise WinError() else: print repr(pBuf) print repr(hMapObject) pBuf_str = cast(pBuf, c_char_p) print repr(pBuf_str.value) print repr(pBuf_str) pBuf_buf = cast(pBuf, Buffer) Here's the problem. pBuf is a pointer to a Buffer structure, not the buffer structure itself. Something like pBuf_buf = Buffer.from_address(pBuf) may work. Thomas -- http://mail.python.org/mailman/listinfo/python-list
Re: Semi-newbie, rolling my own __deepcopy__
Michael Spencer wrote: BTW, as I mentioned in a previous comment, I believe this would be more plainly written as type(self).__new__(), to emphasize that you are constructing the object without initializing it. (There is a explanation of __new__'s behaviour at http://www.python.org/2.2/descrintro.html#__new__). There is also now documentation in the standard location: http://docs.python.org/ref/customization.html And just to clarify Michael's point here, writing this as __new__ means that __init__ is not called twice: py class C(object): ... def __new__(cls): ... print '__new__' ... return super(C, cls).__new__(cls) ... def __init__(self): ... print '__init__' ... py c = C() __new__ __init__ py c2 = type(c)(); c2.__init__() __new__ __init__ __init__ py c3 = type(c).__new__(C); c3.__init__() __new__ __init__ But definitely check the docs for more information on __new__. Some of the interworkings are kind of subtle. STeVe -- http://mail.python.org/mailman/listinfo/python-list
Compiling extensions
I would like to compile extensions usig distutils. is there a way to set which compiler to use ? I am using windows and VC++ 7.1 comp. Åke -- http://mail.python.org/mailman/listinfo/python-list
Re: Lambda: the Ultimate Design Flaw
Simon Brunning [EMAIL PROTECTED] writes: On Apr 6, 2005 4:42 PM, Scott David Daniels [EMAIL PROTECTED] wrote: I've always wondered about this turn of phrase. I seldom eat a cake at one sitting. Clearly you're just not trying. ;-) :-))) John -- http://mail.python.org/mailman/listinfo/python-list
Re: Decorator Base Class: Needs improvement.
On Wed, 06 Apr 2005 08:10:22 GMT, [EMAIL PROTECTED] (Bengt Richter) wrote: I don't understand your seeming fixation with wrappers and wrapping. Fixated implies, I'm stuck on a single thing, but I'm not. I am learning as I go, and exploring some possibilities as well. :-) That's not the only use for decorators. See Raymond Hettinger's optimizing decorators in the cookbook for instance. Thanks, I'll look for it. Is it in the new edition? I haven't picked it up yet. Decorators are something like metaclasses for functions, with much more general possibilities than wrapping, IMO. I'm not sure I see the metaclass relation. What more general things can be done with Decorators, that can't be done with a wrapper? Wrapping, and the @decorator expressions, interest me because I see a lot of potential in it's use, and so I'm trying to learn them, and at the same time, there are things about the @ expression that seems (to me), that it's not the most practical way to do what it was intended for. On the plus side, it's kind of cute with the little curly thing propped up on top of the function. It's a neat trick that it does what it does with a minimal amount of changes to the language by taking advantage of pythons existing function perimeter and object passing properties. It saves a bit of typing because we don't have to retype the function name a few times. (Several people have referred to it as 'sugar', and now I am starting to agree with that opinion.) On the minus side, it's not intuitive to use. It is attached to the function definitions so they are limited, they can't be easily unwrapped and rewrapped without redefining the function also. The recursive nature of stacked @ statements is not visible. So my opinion of @ as a whole is currently: -1 I think you'll have to show some convincing use cases showing a clear advantage over current decoration coding if you want converts ;-) What about the following? :-) # Using this simple wrapper class: class wrapper(object): def __call__(self,x): # preprocess x x*=2 # Make a change so we can see it result = self.function(x) # postprocuess result return result # A function to apply the wrapper: def wrap(function,wrapper): w = wrapper() w.function = function return w # The function def fn(x): return x print fn(5) # Before # Wrapit. fn = wrap(fn,wrapper) print fn(5) # After # Unwrap it. fn = fn.function print fn(5) # And back again #prints #5 #10 #5 It has several advantages over @ expression. It doesn't need the triple nested defines to get the function name and argument list, the wrapper is simpler, It can be placed on a function and then removed, when and where it's needed, instead of at the point where the function is defined. The following behaves more closely to the existing @ expression in that it has the same nesting behavior for stacked wrappers. I'm looking into a way to do sequential non-nested stacked wrappers at this point, where the output of one goes to the input of the next. That can't be done currently with the @ decorator expression. This stacks a list of 10 wrappers on 10 different functions and reverses the order of the stack every other function. In this case they are all the same, but they could all be differnt. Cheers, Ron #---start--- class wrapper(object): def __call__(self,*x): # preprocess x = [x[0]+1,] print 'preprocess', x[0], self.args # call function result = self.function(*x) # postprocess result +=1 print 'postprocess', result, self.args return result def wrap(f,w,shape='forward'): if shape=='reverse': w.reverse() for ww in w: nw = wrapper() try: nw.args = ww[1] except TypeError: wf = ww[0] nw.function = f f = nw return f # Make a list of ten wrappers with an id number as an additional # wrapper perimeter. w = [] for n in xrange(10): w.append((wrapper,n)) # Wrap 10 functions, 10 times, in reversing order. def func0(x): return x def func1(x): return x def func2(x): return x def func3(x): return x def func4(x): return x def func5(x): return x def func6(x): return x def func7(x): return x def func8(x): return x def func9(x): return x func0 = wrap(func0,w) func1 = wrap(func1,w,'reverse') func2 = wrap(func2,w) func3 = wrap(func3,w,'reverse') func4 = wrap(func4,w) func5 = wrap(func5,w,'reverse') func6 = wrap(func6,w) func7 = wrap(func7,w,'reverse') func8 = wrap(func8,w) func9 = wrap(func9,w,'reverse') print func0(0) print func1(0) print func2(0) print func3(0) print func4(0) print func5(0) print func6(0) print func7(0) print func8(0) print func9(0) #--end-- -- http://mail.python.org/mailman/listinfo/python-list
Re: Best editor?
François Pinard [EMAIL PROTECTED] writes: [...] Overall, Vim is also cleaner than Emacs, and this pleases me. [...] Is this still true when comparing XEmacs vs. vim? (rather than GNU Emacs vs. vim) I've always used GNU Emacs, but I have got the impression that XEmacs is (was?) cleaner in some ways. John -- http://mail.python.org/mailman/listinfo/python-list
Re: Calling a Perl Module from Python ( future direction of Python)
Really! That's a pity... Instead of trying to recreate a repository the size of CPAN, a Python interface to Perl modules is really called for. Instead of fretting over decorator syntax and lispiness, might I suggest that development efforts be directed to this? Developers, are you listening? Guido? PS And I don't mean waiting for Perl 6 to condense... --- Swaroop C H [EMAIL PROTECTED] wrote: On Apr 6, 2005 8:23 AM, gf gf [EMAIL PROTECTED] wrote: I've recently made the switch. Wow, is Python great! One thing which I haven't been able to do is replace Perl's great lib collection (HTML::Parser, for instance, can do a lot that Soup just can't). You've just discovered the only limitation of Python (in my view) - it doesn't have a module repository to rival CPAN. AFAIK, there isn't any reliable way to call Perl modules from Python. -- Swaroop C H Blog: http://www.swaroopch.info Book: http://www.byteofpython.info __ Yahoo! Messenger Show us what our next emoticon should look like. Join the fun. http://www.advision.webevents.yahoo.com/emoticontest -- http://mail.python.org/mailman/listinfo/python-list
Re: Best editor?
ChinStrap [EMAIL PROTECTED] writes: When not using the interactive prompt, what are you using? I keep hearing everyone say Emacs, but I can't understand it at all. I keep trying to learn and understand why so many seem to like it because I can't understand customization even without going through a hundred menus that might contain the thing I am looking for (or I could go learn another language just to customize!). [...] Opinions on what the best is? Or reading I could get to maybe sway me to Emacs (which has the major advantage of being on everyone's system). Two reasons I use emacs: 1. For any question Can I do X with emacs, the answer is almost always yes, use this code that's already written and working 2. I already know it ;-) BTW, I use vi keybindings, and I imagine all other editors can do the same (though perhaps not as well as viper, the emacs package that does this -- see 1. above), so that's no reason in itself to use vim. John -- http://mail.python.org/mailman/listinfo/python-list
Re: Installing Python 2.4 on Linux
Edward Diener wrote: I can install Python 2.4 on the Fedora 3 Linux system, but after I do a number of Linux utilities and commands, like yum, stop working because they were dependent on the Python 2.3 installation. What happens is that Python 2.4 replaces the /usr/bin/python module with the Python 2.4 version. If I replace /usr/bin/python with the Python 2.3 version executable, which is still on my system, that all the aforesaid modules depend on, they start working again, but I can no longer execute modules, like IDLE, which was part of my Python 2.4 distribution. What is the solution to this ? The operating system was installed with Python 2.3 and the development libraries but no tools, doc, or otherwise. I have installed Python 2.4 with all the RPMs and copied down the Python 2.4 documentation to my machine ( since python24-docs.rpm gives one very little ). I would naturally like to use Python 2.4 without killing all the commands that depend on Python 2.3. No doubt these commands have their modules in the site libraries for Python 2.3. Of course I would love to update these dependencies to use Python 2.4 but newer RPMs for these commands do not exist. I do not know whether this is a Python problem or a Fedora 3 problem but I thought I would ask here first and see if anybody else had the same problem. I imagine the problem might exist on other Linux systems. Actually the Fedora RPMS supplied on the Python website are fine: http://www.python.org/2.4.1/rpms.html Quoting from that page: # Q) Is it safe to install these RPMs on a Red Hat system? Will they over-write the system python and cause problems with other Red Hat applications that expect a different version of Python? # A) The RPMs that start with python2.4 are built to not interfere with the system Python. They install as /usr/bin/python2.4 and will not conflict with the system Python unless you are running on a system that ships the a version of Python which has the same major/minor number. To invoke the interpreter with these packages, you will explicitly have to run python2.4. Note that all Python RPMs provided by Python.org and Red Hat provide a /usr/bin/python2.4 (or similar, with major/minor number), even if they also provide /usr/bin/python. So, yes, it should be safe. Note that you may need to build and install a second copy of any packages which you need access to with the supplemental version of Python. You can build packages of these files for the Python 2.4 interpreters for packages which use Distutils, by using the command python2.4 setup.py bdist_rpm. This is by far the preferred way to install a different version of Python to the default version provided with a distribution, as you don't then conflict with packages that require the default version. Also, it is better to do it like this using real packages than to rename files manually. I have used the above successfully on Fedora Core 3 (and other similar versions on other distro versions), if it doesn't work for you there is a source RPM available to rebuild from Hope that helps David -- http://mail.python.org/mailman/listinfo/python-list
Re: Best editor?
Ville Vainio [EMAIL PROTECTED] writes: Miki == Miki Tebeka [EMAIL PROTECTED] writes: Miki Emacs (or VIm in my case) takes time to learn. However when Miki you start to understand it and know you way around it'll do Miki things no other editor will do for you. Other editors also do stuff Emacs won't do. Code completion is a killer feature and emacs sucks at it (yes, w/ Cedet too). [...] I thought that too, but then I bound dabbrev-expand to F4, and it seems even better than 'proper' completion (for reducing keystrokes, anyway). John -- http://mail.python.org/mailman/listinfo/python-list
number conversion
I'm writing a program to read in raw data from a WAV file, and write it
to an IT file. I got this to work in C by reading the data into an
array of unsigned chars called RawDataAry, then converted it to
signed chars by doing the following:
signed char *CharAry = malloc(sizeof(signed char) * frames);
for (i = 0; i input_frames; i++)
CharAry[i] = (signed char)(((signed short)WavDataAry[i]) - 128);
It worked.
But when I tried to do this kind of conversion in Python, I got an
OverflowError exception.
First I read the data into an array of unsigned chars:
fmt = str(chunklen) + 'B'
fmtsize = struct.calcsize(fmt)
rawdata = struct.unpack(fmt, s[:fmtsize])
rawdata = list(rawdata)
Then I tried to convert it:
charary = array.array('b')
charary.fromlist(rawdata)
This last line threw the OverflowError exception, OverflowError:
signed char is greater than maximum.
Is there a way to do this?? Thanks a lot in advance!!
--Nick
--
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Re: Decorator Base Class: Needs improvement.
Ron_Adam wrote: On Wed, 06 Apr 2005 08:10:22 GMT, [EMAIL PROTECTED] (Bengt Richter) wrote: I don't understand your seeming fixation with wrappers and wrapping. Fixated implies, I'm stuck on a single thing, but I'm not. I am learning as I go, and exploring some possibilities as well. :-) That's not the only use for decorators. See Raymond Hettinger's optimizing decorators in the cookbook for instance. Thanks, I'll look for it. Is it in the new edition? I haven't picked it up yet. Decorators are something like metaclasses for functions, with much more general possibilities than wrapping, IMO. I'm not sure I see the metaclass relation. What more general things can be done with Decorators, that can't be done with a wrapper? Wrapping, and the @decorator expressions, interest me because I see a lot of potential in it's use, and so I'm trying to learn them, and at the same time, there are things about the @ expression that seems (to me), that it's not the most practical way to do what it was intended for. On the plus side, it's kind of cute with the little curly thing propped up on top of the function. It's a neat trick that it does what it does with a minimal amount of changes to the language by taking advantage of pythons existing function perimeter and object passing properties. It saves a bit of typing because we don't have to retype the function name a few times. (Several people have referred to it as 'sugar', and now I am starting to agree with that opinion.) On the minus side, it's not intuitive to use. It is attached to the function definitions so they are limited, they can't be easily unwrapped and rewrapped without redefining the function also. The recursive nature of stacked @ statements is not visible. So my opinion of @ as a whole is currently: -1 I think you'll have to show some convincing use cases showing a clear advantage over current decoration coding if you want converts ;-) What about the following? :-) # Using this simple wrapper class: class wrapper(object): def __call__(self,x): # preprocess x x*=2 # Make a change so we can see it result = self.function(x) # postprocuess result return result # A function to apply the wrapper: def wrap(function,wrapper): w = wrapper() w.function = function return w # The function def fn(x): return x print fn(5) # Before # Wrapit. fn = wrap(fn,wrapper) print fn(5) # After # Unwrap it. fn = fn.function print fn(5) # And back again #prints #5 #10 #5 It has several advantages over @ expression. It doesn't need the triple nested defines to get the function name and argument list, the wrapper is simpler, It can be placed on a function and then removed, when and where it's needed, instead of at the point where the function is defined. The following behaves more closely to the existing @ expression in that it has the same nesting behavior for stacked wrappers. I'm looking into a way to do sequential non-nested stacked wrappers at this point, where the output of one goes to the input of the next. That can't be done currently with the @ decorator expression. This stacks a list of 10 wrappers on 10 different functions and reverses the order of the stack every other function. In this case they are all the same, but they could all be differnt. Cheers, Ron #---start--- class wrapper(object): def __call__(self,*x): # preprocess x = [x[0]+1,] print 'preprocess', x[0], self.args # call function result = self.function(*x) # postprocess result +=1 print 'postprocess', result, self.args return result def wrap(f,w,shape='forward'): if shape=='reverse': w.reverse() for ww in w: nw = wrapper() try: nw.args = ww[1] except TypeError: wf = ww[0] nw.function = f f = nw return f # Make a list of ten wrappers with an id number as an additional # wrapper perimeter. w = [] for n in xrange(10): w.append((wrapper,n)) # Wrap 10 functions, 10 times, in reversing order. def func0(x): return x def func1(x): return x def func2(x): return x def func3(x): return x def func4(x): return x def func5(x): return x def func6(x): return x def func7(x): return x def func8(x): return x def func9(x): return x func0 = wrap(func0,w) func1 = wrap(func1,w,'reverse') func2 = wrap(func2,w) func3 = wrap(func3,w,'reverse') func4 = wrap(func4,w) func5 = wrap(func5,w,'reverse') func6 = wrap(func6,w) func7 = wrap(func7,w,'reverse') func8 = wrap(func8,w) func9 = wrap(func9,w,'reverse') print func0(0) print func1(0) print func2(0) print func3(0) print func4(0) print func5(0) print func6(0) print func7(0) print func8(0) print func9(0) #--end-- I find I am still left asking the question why would anyone want to do that?. The difference between a use case and an example is that a use case should demonstrate the solution of
Re: Calling a Perl Module from Python ( future direction of Python)
An interface to Perl already exists: http://www.python.org/moin/PyPerl -jjr -- http://mail.python.org/mailman/listinfo/python-list
Python sleep doesn't work right in a loop?
Just a simple bit of code to toggle between two state at intervals... import time for i in range(4): print 'On' time.sleep(1) print 'Off' time.sleep(1) ... SHOULD toggle On and Off four times with one-second pauses. When I run this, the loop pauses the full eight seconds then prints the Ons and Offs all at once. What's up with that? -- http://mail.python.org/mailman/listinfo/python-list
Re: Python sleep doesn't work right in a loop?
For me it works fine. It seems that for you stdout is not flushed correctly in your terminal. What kind of terminal are you writing to? -- http://mail.python.org/mailman/listinfo/python-list
