Re: unicode issue
On Sep 30, 3:34 am, gentlestone tibor.b...@hotmail.com wrote:
Why don't work this code on Python 2.6? Or how can I do this job?
_MAP = {
# LATIN
u'À': 'A', u'Á': 'A', u'Â': 'A', u'Ã': 'A', u'Ä': 'A', u'Å': 'A',
u'Æ': 'AE', u'Ç':'C',
u'È': 'E', u'É': 'E', u'Ê': 'E', u'Ë': 'E', u'Ì': 'I', u'Í': 'I',
u'Î': 'I',
u'Ï': 'I', u'Ð': 'D', u'Ñ': 'N', u'Ò': 'O', u'Ó': 'O', u'Ô': 'O',
u'Õ': 'O', u'Ö':'O',
u'Ő': 'O', u'Ø': 'O', u'Ù': 'U', u'Ú': 'U', u'Û': 'U', u'Ü': 'U',
u'Ű': 'U',
u'Ý': 'Y', u'Þ': 'TH', u'ß': 'ss', u'à':'a', u'á':'a', u'â': 'a',
u'ã': 'a', u'ä':'a',
u'å': 'a', u'æ': 'ae', u'ç': 'c', u'è': 'e', u'é': 'e', u'ê': 'e',
u'ë': 'e',
u'ì': 'i', u'í': 'i', u'î': 'i', u'ï': 'i', u'ð': 'd', u'ñ': 'n',
u'ò': 'o', u'ó':'o',
u'ô': 'o', u'õ': 'o', u'ö': 'o', u'ő': 'o', u'ø': 'o', u'ù': 'u',
u'ú': 'u',
u'û': 'u', u'ü': 'u', u'ű': 'u', u'ý': 'y', u'þ': 'th', u'ÿ': 'y',
# LATIN_SYMBOLS
u'©':'(c)',
# GREEK
u'α':'a', u'β':'b', u'γ':'g', u'δ':'d', u'ε':'e', u'ζ':'z',
u'η':'h', u'θ':'8',
u'ι':'i', u'κ':'k', u'λ':'l', u'μ':'m', u'ν':'n', u'ξ':'3',
u'ο':'o', u'π':'p',
u'ρ':'r', u'σ':'s', u'τ':'t', u'υ':'y', u'φ':'f', u'χ':'x',
u'ψ':'ps', u'ω':'w',
u'ά':'a', u'έ':'e', u'ί':'i', u'ό':'o', u'ύ':'y', u'ή':'h',
u'ώ':'w', u'ς':'s',
u'ϊ':'i', u'ΰ':'y', u'ϋ':'y', u'ΐ':'i',
u'Α':'A', u'Β':'B', u'Γ':'G', u'Δ':'D', u'Ε':'E', u'Ζ':'Z',
u'Η':'H', u'Θ':'8',
u'Ι':'I', u'Κ':'K', u'Λ':'L', u'Μ':'M', u'Ν':'N', u'Ξ':'3',
u'Ο':'O', u'Π':'P',
u'Ρ':'R', u'Σ':'S', u'Τ':'T', u'Υ':'Y', u'Φ':'F', u'Χ':'X',
u'Ψ':'PS', u'Ω':'W',
u'Ά':'A', u'Έ':'E', u'Ί':'I', u'Ό':'O', u'Ύ':'Y', u'Ή':'H',
u'Ώ':'W', u'Ϊ':'I', u'Ϋ':'Y',
# TURKISH
u'ş':'s', u'Ş':'S', u'ı':'i', u'İ':'I', u'ç':'c', u'Ç':'C',
u'ü':'u', u'Ü':'U',
u'ö':'o', u'Ö':'O', u'ğ':'g', u'Ğ':'G',
# RUSSIAN
u'а':'a', u'б':'b', u'в':'v', u'г':'g', u'д':'d', u'е':'e',
u'ё':'yo', u'ж':'zh',
u'з':'z', u'и':'i', u'й':'j', u'к':'k', u'л':'l', u'м':'m',
u'н':'n', u'о':'o',
u'п':'p', u'р':'r', u'с':'s', u'т':'t', u'у':'u', u'ф':'f',
u'х':'h', u'ц':'c',
u'ч':'ch', u'ш':'sh', u'щ':'sh', u'ъ':'', u'ы':'y', u'ь':'',
u'э':'e', u'ю':'yu', u'я':'ya',
u'А':'A', u'Б':'B', u'В':'V', u'Г':'G', u'Д':'D', u'Е':'E',
u'Ё':'Yo', u'Ж':'Zh',
u'З':'Z', u'И':'I', u'Й':'J', u'К':'K', u'Л':'L', u'М':'M',
u'Н':'N', u'О':'O',
u'П':'P', u'Р':'R', u'С':'S', u'Т':'T', u'У':'U', u'Ф':'F',
u'Х':'H', u'Ц':'C',
u'Ч':'Ch', u'Ш':'Sh', u'Щ':'Sh', u'Ъ':'', u'Ы':'Y', u'Ь':'',
u'Э':'E', u'Ю':'Yu', u'Я':'Ya',
# UKRAINIAN
u'Є':'Ye', u'І':'I', u'Ї':'Yi', u'Ґ':'G', u'є':'ye', u'і':'i',
u'ї':'yi', u'ґ':'g',
# CZECH
u'č':'c', u'ď':'d', u'ě':'e', u'ň':'n', u'ř':'r', u'š':'s',
u'ť':'t', u'ů':'u',
u'ž':'z', u'Č':'C', u'Ď':'D', u'Ě':'E', u'Ň':'N', u'Ř':'R',
u'Š':'S', u'Ť':'T', u'Ů':'U', u'Ž':'Z',
# POLISH
u'ą':'a', u'ć':'c', u'ę':'e', u'ł':'l', u'ń':'n', u'ó':'o',
u'ś':'s', u'ź':'z',
u'ż':'z', u'Ą':'A', u'Ć':'C', u'Ę':'e', u'Ł':'L', u'Ń':'N',
u'Ó':'o', u'Ś':'S',
u'Ź':'Z', u'Ż':'Z',
# LATVIAN
u'ā':'a', u'č':'c', u'ē':'e', u'ģ':'g', u'ī':'i', u'ķ':'k',
u'ļ':'l', u'ņ':'n',
u'š':'s', u'ū':'u', u'ž':'z', u'Ā':'A', u'Č':'C', u'Ē':'E',
u'Ģ':'G', u'Ī':'i',
u'Ķ':'k', u'Ļ':'L', u'Ņ':'N', u'Š':'S', u'Ū':'u', u'Ž':'Z'
}
def downcode(name):
downcode(uŽabovitá zmiešaná kaša)
u'Zabovita zmiesana kasa'
for key, value in _MAP.iteritems():
name = name.replace(key, value)
return name
Though C Python is pretty optimized under the hood for this sort of
single-character replacement, this still seems pretty inefficient
since you're calling replace for every character you want to map. I
think that a better approach might be something like:
def downcode(name):
return ''.join(_MAP.get(c, c) for c in name)
Or using string.translate:
import string
def downcode(name):
table = string.maketrans(
'ÀÁÂÃÄÅ...',
'AA...')
return name.translate(table)
--
http://mail.python.org/mailman/listinfo/python-list
Re: OK to memoize re objects?
On Sep 21, 11:02 am, Nobody nob...@nowhere.com wrote: On Mon, 21 Sep 2009 07:11:36 -0700, Ethan Furman wrote: Looking in the code for re in 2.5: _MAXCACHE = 100 On the other hand, I (a re novice, to be sure) have only used between two to five in any one program... it'll be a while before I hit _MAXCACHE! Do you know how many REs import-ed modules are using? The cache isn't reserved for __main__. Based on this, I'd say that the best policy would be that if you only have a handful of simple REs that are used only on occasion, it's probably not worth using re.compile--even if they fall out of cache, it shouldn't take a noticeable amount of time to recompile them. If, however, these are either complex REs, or REs that are being used very frequently, say in a loop, might as well save the compiled RE somewhere just to be sure it doesn't have to be recompiled at any point. -- http://mail.python.org/mailman/listinfo/python-list
Re: easy question, how to double a variable
On Sep 22, 9:57 am, Grant Edwards inva...@invalid.invalid wrote: On 2009-09-22, Mel mwil...@the-wire.com wrote: Tim Roberts wrote: daggerdvm dagger...@yahoo.com wrote: carl banks.you are a dork What are you, eleven years old? Look, you asked us to answer for you what is CLEARLY a homework question. It is unethical for you to ask that, and it is unethical for us to answer it. Forget ethical. We can do his homework for him, we can perhaps pass exams for him, maybe graduate for him, and then with our luck, he'll get a job in our office and we get to do his work for him. No, no, no. The plan is to do his homework for him so that he's incompetent when he graduates and won't be competition for the rest of us who did do our homework. Well, while they may not be as much competition come promotion time, I think Mr. Finney had it right that these people *do* still somehow get hired, and then the rest of us end up having to do enough work for multiple people. Sometimes spending more time redoing other peoples' shoddy work than it would have taken to do ourselves in the first place. Annoying for the programmer, but really bad for business. -- http://mail.python.org/mailman/listinfo/python-list
Re: An assessment of the Unicode standard
On Sep 14, 5:05 am, Christopher Culver crcul...@christopherculver.com wrote: Hyuga hyugaricd...@gmail.com writes: I just wanted to add, in defense of the Chinese written language ... that I think it would make a fairly good candidate for use at least as a universal *written* language. Particularly simplified Chinese since, well, it's simpler. The advantages are that the grammar is relatively simple, and it can be used to illustrate concepts independently of the writer's spoken language. Musings about the universality of the Chinese writing system, once so common among Western thinkers, nevertheless do not square with reality. The Chinese writing system is in fact deeply linked to the Chinese language, even to the specific dialect being spoken. See Defrancis' _The Chinese Language: Fact and Fantasy_ (Honolulu: University of Hawaii Press, 1984): http://preview.tinyurl.com/rbyuuk Oh, certainly! I thought I said as much in my original post, but maybe I didn't stress that enough. I'm a lot stronger in Japanese than I am in Chinese, but even Japanese uses various Chinese characters in ways that have deep cultural ties that may not translate well (and in many cases that are completely different from those characters' implications in any Chinese language). I guess the reason I didn't stress that enough is that I'm in no way implying that they be used as is. I just think they could be taken as the basis for a standardized universal written language. One might argue that it would make more sense to come up with a new character set for that, but here we have one that so many people are already familiar with in some form or another. And the radical system makes them much easier to remember than many people realize. -- http://mail.python.org/mailman/listinfo/python-list
Re: An assessment of the Unicode standard
On Aug 29, 8:20 pm, John Machin sjmac...@lexicon.net wrote: On Aug 30, 8:46 am, r rt8...@gmail.com wrote: Take for instance the Chinese language with it's thousands of characters and BS, it's more of an art than a language. Why do we need such complicated languages in this day and time. Many languages have been perfected, (although not perfect) far beyond that of Chinese language. The Chinese language is more widely spoken than English, is quite capable of expression in ASCII (r tongzhi shi sha gua) and doesn't have those pesky it's/its problems. The A-Z char set is flawless! ... for expressing the sounds of a very limited number of languages, and English is *NOT* one of those. I'd say don't feel the troll, but too late for that I guess. I just wanted to add, in defense of the Chinese written language (in case this hasn't already been added--I'm probably not going to bother reading this entire thread) that I think it would make a fairly good candidate for use at least as a universal *written* language. Particularly simplified Chinese since, well, it's simpler. The advantages are that the grammar is relatively simple, and it can be used to illustrate concepts independently of the writer's spoken language. Sure it's tied somewhat to the Chinese language, but it can certainly be mapped more easily to any other language than phonetically-based written language. -- http://mail.python.org/mailman/listinfo/python-list
Re: are user defined classes hashable?
On Jul 20, 10:53 pm, a...@pythoncraft.com (Aahz) wrote: In article 373d6c69-6965-4a88-bdd2-8028ef850...@k6g2000yqn.googlegroups.com, Hyuga hyugaricd...@gmail.com wrote: Regardless, Nicolas's example can be applied to the class too: class Foo(object): pass hash(Foo) 11443104 id(Foo) 11443104 class objects are just objects of type 'type'. Not quite. They certainly default that way, but changing the metaclass changes a class's type:: class M(type): pass class C(object): pass class C2(object): __metaclass__ = M print type(C) print type(C2) Well, okay, you got me there. But the OP wasn't asking about classes with different metaclasses. And besides, type(type(C2)) is still type ;) -- http://mail.python.org/mailman/listinfo/python-list
Re: are user defined classes hashable?
On Jul 19, 11:39 am, Nicolas Dandrimont nicolas.dandrim...@crans.org wrote: * Alan G Isaac alan.is...@gmail.com [2009-07-19 14:46:12 +]: Again, my question is about the class not its instances, but still, checking as you suggest gives the same answer. That's what I get for answering before my coffee! Regardless, Nicolas's example can be applied to the class too: class Foo(object): pass hash(Foo) 11443104 id(Foo) 11443104 class objects are just objects of type 'type'. -- http://mail.python.org/mailman/listinfo/python-list
Re: Perl's @foo[3,7,1,-1] ?
On Jun 13, 6:22 pm, Brian Quinlan br...@sweetapp.com wrote: MRAB wrote: Brian Quinlan wrote: kj wrote: In slrnh37t2p.63e.n...@irishsea.home.craig-wood.com Nick Craig-Wood n...@craig-wood.com writes: However I can't think of the last time I wanted to do this - array elements having individual purposes are usually a sign that you should be using a different data structure. In the case I was working with, was a stand-in for the value returned by some_match.groups(). The match comes from a standard regexp defined elsewhere and that captures more groups than I need. (This regexp is applied to every line of a log file.) kj The common idiom for this sort of thing is: _, _, _, val1, _, _, _, val2, ..., val3 = some_match.groups() Alternatively: val1, val2, val3 = some_match.group(4, 8, something) Actually, now that I think about it, naming the groups seems like it would make this code a lot less brittle. I was about to suggest that too, but it sounds like the OP has little or no control, in this case, over the RE itself. Another thing I would suggest is using the (?:) syntax--it allows creating a syntactic group that isn't returned in the list of match groups. -- http://mail.python.org/mailman/listinfo/python-list
Re: matplotlib - overlaying plots.
On May 14, 7:41 am, Ant ant...@gmail.com wrote: Hi All, I am trying to get matplotlib to overlay a couple of graphs, but am getting nowhere. I originally thought that the following may work: x = [1,2,3,4,5] y = [2,4,6,8,10] y2 = [1,4,9,16,25] plot(x, y) plot(x, y2) Now this works as desired, however, the actual case I have is more like this: x = [1,2,3,4,5] y = [2,4,6,8,10] y2 = [.0001, .0002, .0003, .0004, .0005] Now the graph is useless, since the results are plotted on the same axis. What I really want is two different sets of axes, each scaled appropriately, but overlayed. The data I actually have, is one set of axes plotting distance against elevation, and a second plotting distance against speed. The former has (y-coord) units in the range 0-2000 ft and the latter 0 - 0.01 miles/second. I want them on the same graph, so points can be easily correlated, but overlayed so that each line has a different scale on the y-axis. The closest I can get is to have two subplots, one above the other. Thanks in advance, Ant. Just scale up the y-axis values of your second graph 200,000 times, and specify in label that the y-axis for the second graph is velocity scaled up 20x for comparison purposes. Nothing wrong with that-- it's done all the time. On the other hand, I just took a peek at the matplotlib example gallery, which is very diverse, and it has an example that I think is exactly what you're looking for: http://matplotlib.sourceforge.net/examples/api/two_scales.html -- http://mail.python.org/mailman/listinfo/python-list
Re: need to start a new project , can python do all that ?
On Apr 15, 10:54 am, Deep_Feelings doctore...@gmail.com wrote: On Apr 15, 4:05 pm, Tim Rowe digi...@gmail.com wrote: 2009/4/15 Deep_Feelings doctore...@gmail.com: I want to start programming a new program (electronic health care center) in python and before start learning python i wanna make sure that python does have all the features i need to accomplish this project so i wanna ask you does python able to support these features : 1- cross platform (windows + linux) 2- mysql database access 3- 2D graphs (curves) 4- support of international languages 5- can access a scanner and input pictures from it. and possibly be able to import data from labratory machines (such as CBC machines) to automatically register patient investigations result into the system (not mandatory) What are the safety and security requirements? If you're handling patient investigation results then there are certainly security issues because of patient confidentiality, and there may be safety issues (could a software fault contribute to a patient receiving incorrect treatment, or failing to receive necessary treatment?) You almost certainly need to contact the appropriate regulatory authority to check whether they have any requirements for languages in such applications (and for specific development processes), or you could find yourself either with an application you can't use or a very big lawsuit and possibly jail if it goes wrong. thank you so much ,rest assured that the code will me tested very well (in real world situation) before using it. I'm not too assured... What are the actual requirements for this software? Is this intended for real world use in health care? I'm not too comfortable with a single individual with apparently limited experience in Python developing something like that. Not that it's any of my business...or for all I know it may be! You might as well have started this post I want to start programming a new program (air traffic control system) in python and before start learning python... -- http://mail.python.org/mailman/listinfo/python-list
Re: setup.py install and bdist_egg
On Mar 13, 4:41 pm, Jasiu jasi...@gmail.com wrote: Hey, I work at a company where I'm lucky enough to write web apps using Python and WSGI :). We develop more and more stuff in Python and it's becoming a mess of dependencies, so we thought we would create a guideline for developers that describes the whole process of deploying a Python app on a server. Since all of our servers run Debian, all of our software has to be installed as Debian packages - other departments that don't use Python (shame on them! :D) already follow this policy. Here is what we have figured so far: 1) Write your code. 2) Prepare setup.py, and put names of required eggs in there. 3) Write a Debian wrapper that uses CDBS Python class, and put names of required Debian packages in there. 4) Build Debian package. 5) Done! Deploy on server and have fun :). This guideline already works pretty well for us, but I thought I could tweak it a little. I want to make the Debian package wrapper as thin as possible so that if we ever stop using Debian, we will still be able to deploy all of our software as eggs. This goal turned to be pretty challenging. I have a few questions. Glad to see I'm not the only one with this sort of challenge. Though it sounds like you're already a step ahead of me in that you're properly maintaining requirements/dependencies for your Python packages. When I build my Debian packages I make sure that *they* have the correct dependencies. But my setup.py files do not have all their dependencies listed, so it's a pain to get everything set up correctly when not doing it through the Debian package system. 1) Debian has a debian/dirs file where you can list all the directories that the package should create, for example those in /var/ log, /var/lib . I already figured out that I can use setup.py 'install_data' keyword for that, even for empty directories. Then I can use 'setup.py install' command and things work great. But... How about eggs? I'd like my egg to somehow contain or create such directories. For example, I have a config file that I want to place in /etc directory. I can do that using 'setup.py install', but 'setup.py bdist_egg' will just create an egg containing etc/ directory. Can I do something about it? Also, why doesn't an egg contain empty dirs that I place in install_data? My approach to this has been to use a postinst script to copy files out of the eggs (or when I'm not installing as an egg, from /usr/ share) to the correct locations in /etc. However, this doesn't work so well if you're not using a Debian package. But see below: 2) What about file permissions? Can they be set by setup.py? My software runs as www-data user and so /var/log and /var/lib directories should have proper owner, group and permissions. I didn't figure out a way to change permissions using setup.py. In Debian I can use postinst script for that. I'm also using a postinst script for configuring my system, but I want to move away from that. I already have a command-line tool for easily administering certain aspects of the system. So my plan is to implement a deploy command that creates all the directories with the correct permissions, generates the config files, and performs all the configuration my postinst script currently does. Then the postinst script simply needs to call the deploy command. That way I can take advantage of debconf without being dependent on it. If anything sounds unclear, blame my bad english :). Sounds perfectly clear to me! -- http://mail.python.org/mailman/listinfo/python-list
Re: Guidance on writing a top-like console
On Feb 27, 6:08 pm, ntwrkd ntw...@gmail.com wrote: I am interested in writing an application that functions like a Unix or Linux top in the way it displays data. It should be command-line based but dynamically refreshing. I'm not sure what I should take into account or how I might go about implementing this? Any suggestions are appreciated. OT Do by any chance play TF2? I've seen someone with the username 'ntwrkd' before. Not that it's necessarily an uncommon username, but it was the first thing I thought of when I saw this post. /OT -- http://mail.python.org/mailman/listinfo/python-list
Re: Will multithreading make python less popular?
On Feb 16, 4:34 am, rushen...@gmail.com wrote: Hi everybody, I am an engineer. I am trying to improve my software development abilities. I have started programming with ruby. I like it very much but i want to add something more. According to my previous research i have designed a learning path for myself. It's like something below. 1. Ruby (Mastering as much as possible) 2. Python (Mastering as much as possible) 3. Basic C++ or Basic Java And the story begins here. As i search on the net, I have found that because of the natural characteristics of python such as GIL, we are not able to write multi threaded programs. Oooops, in a kind of time with lots of cpu cores and we are not able to write multi threaded programs. That is out of fashion. How a such powerful language doesn't support multi threading. That is a big minus for python. But there is something interesting, something like multi processing. But is it a real alternative for multi threading. As i searched it is not, it requires heavy hardware requirements (lots of memory, lots of cpu power). Also it is not easy to implement, too much extra code... After all of that, i start to think about omiting python from my carrier path and directly choosing c++ or java. But i know google or youtube uses python very much. How can they choose a language which will be killed by multi threading a time in near future. I like python and its syntax, its flexibility. What do you think about multi threading and its effect on python. Why does python have such a break and what is the fix. Is it worth to make investment of time and money to a language it can not take advantage of multi cores? Though I'm sure this has already been shot to death, I would just add that maybe the better question would be: Will Python make multithreading less popular? My answer would be something along the lines of, that would be nice, but it just depends on how many people adopt Python for their applications, realize they can't use threads to take advantage of multiple CPUs, ask this same bloody question for the thousandth time, and are told to use the multiprocessing module. -- http://mail.python.org/mailman/listinfo/python-list
Re: I always wonder ...
On Dec 22, 1:51 pm, Grant Edwards inva...@invalid wrote: On 2008-12-22, s...@pobox.com s...@pobox.com wrote: ... shouldn't people who spend all their time trolling be doing something else: studying, working, writing patches which solve the problems they perceive to exist in the troll subject? I think you misunderstand the point of trolling. The author of a troll post doesn't actually care about the problems (and may not even genuinely perceive them as problems). Is there some online troll game running where the players earn points for generating responses to their posts? Yup. It's called Usenet. a.k.a. multi-player Emacs in deathmatch mode on nightmare difficulty. ;) -- http://mail.python.org/mailman/listinfo/python-list
Re: Python 3 __cmp__ semantic change?
On Nov 21, 4:09 am, Duncan Booth [EMAIL PROTECTED] wrote: Johannes Bauer [EMAIL PROTECTED] wrote: Seems it was removed on purpose - I'm sure there was a good reason for that, but may I ask why? Instead of the sleek __cmp__ function I had earlier, I now have code like: def __lt__(self, other): return self.__cmp__(other) 0 def __le__(self, other): return self.__cmp__(other) 0 I hope you actually have = here. def __gt__(self, other): return self.__cmp__(other) 0 def __ge__(self, other): return self.__cmp__(other) = 0 Does anyone know the reason why __cmp__ was discarded? I think it was because __cmp__ was the backward compatible fallback for the newer rich comparison methods and Python 3 cleans up a lot of stuff left in just for backward compatibility. In this case it is a cleanup too far as in most cases (i.e. those cases where you don't need the full complexity of the rich comparisons) __cmp__ is a much simpler solution. Seehttp://mail.python.org/pipermail/python-dev/2003-March/034073.html for Guido's original thoughts. Also, once upon a time pep-3000 referred to the removal of __cmp__ but I can't find it in any of the current peps. Seehttp://mail.python.org/pipermail/python-checkins/2004-August/042959.html andhttp://mail.python.org/pipermail/python-checkins/2004-August/042972.html where the reference to removal of __cmp__ became Comparisons other than ``==`` and ``!=`` between disparate types will raise an exception unless explicitly supported by the type and the reference to Guido's email about removing __cmp__ was also removed. Guido's primary argument for removing it seems to be that the code for supporting both __cmp__ and the rich comparisons is hairy and that it felt really satisfying to remove. I don't think that's a good enough argument. It was hairy because there are a lot of cases to check, but I wouldn't say it was crufty. It made sense, and the way it worked seemed logical enough. I never ran into any problems with it. And by and far the most common case is to implement some total ordering for a class. Now, as has been pointed out, all you really need to define total ordering, at least for sorting, is __eq__ and __lt__, which isn't too bad. But you still lose the ability to make any other sort of comparison without implementing all the other comparison operators too. Perhaps the code could be made somewhat simpler like this: If rich comparisons are defined, use those and *only* those operators that are defined, and don't try to fall back on __cmp__ otherwise. If no rich comparisons are defined, just look for __cmp__. -- http://mail.python.org/mailman/listinfo/python-list
Re: Boolean tests [was Re: Attack a sacred Python Cow]
On Jul 30, 3:53 am, Russ P. [EMAIL PROTECTED] wrote: Fair enough. I have no dog in this particular fight. I just think it wouldn't hurt to add an isempty() or isnonempty() method to the list type, and let people use it if they wish, or continue using if x if that's what they prefer. Go right on ahead. You could implement it like this: class superenhancedlist(list): def isempty(self): return not self a = superenhancedlist() a.isempty() True a.append(1) a.isempty() False Amazingly useful! Go ahead and use that in all your code. Anyone else who comes along and looks at it or tries to maintain it will really love you for it. -- http://mail.python.org/mailman/listinfo/python-list
Re: regarding SWIG
On Jul 22, 5:34 am, Anish Chapagain [EMAIL PROTECTED] wrote: Hi.. I'm new to SWIG and need to create Wrapper for C code, so, I have installed the SWIG already but doesnot know how to run it for generating Interface file... My C code is in message.c so what do i need to do the first step..uisng SWIG..i read the documentation but cannot grasp creating interface file. thank's anish Not sure where you're having trouble. I can understand if there's a language barrier, but I think that the introductory SWIG documentation is pretty darn straightforward, even if you just look at the code, so I don't think there's anything that could be said here that's any more clear, as far as the basics are concerned. You'd have to explain exactly what it is you're stuck on. -- http://mail.python.org/mailman/listinfo/python-list
Re: Iterate creating variables?
On Jun 13, 11:34 am, Reedick, Andrew [EMAIL PROTECTED] wrote: -Original Message- From: [EMAIL PROTECTED] [mailto:python- [EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Friday, June 13, 2008 11:11 AM To: [EMAIL PROTECTED] Subject: Iterate creating variables? I have twenty-five checkboxes I need to create (don't ask): self.checkbox1 = ... self.checkbox2 = ... . . . self.checkbox25 = ... Right now, my code has 25 lines in it, one for each checkbox, since these are all variables. Is there a way to write a loop so that I can have fewer lines of code but still keep the variables? I've tried: for o in xrange(25): self.checkbox[o] = ... which didn't work, and for o in xrange(25): self.checkbox[''%d'%(o)] = ... which also didn't work. Both give the error message: Attribute error: Main.App has no attribute checkbox, which clearly indicates that I'm not keeping the variability aspect I want. Is there a way? I appreciate any and all answers! Either store the checkboxes in an array or hash/dictionary. If that's not practical, then You can use strings to build the code and use eval to execute the string as code. Ex: for i in range(10): code = %d + %d % (i, i) print eval(code) Don't do this. You want for idx in range(10): setattr(self, 'checkbox_%i' % idx) -- http://mail.python.org/mailman/listinfo/python-list
Re: Setting Focus
On Jun 12, 11:04 pm, Gandalf [EMAIL PROTECTED] wrote:
You know these application like ICQ or winamp which stay at the front
of the desktop as long as the user doesn't minimize it. I wont to do
the same with my application in python.
I still didn't manage to make pywinauto to auto set my window frame in
focus reliability so I was hoping this will solve my problem.
I'm working with WX lib on 2.5 python on Microsoft Windows XP
if any one {know / heard /think he know /thunk he heard/ sow once
article that shows} how to do it I will be happy to know
thank you in advance
I'm not sure if there's a way to do this purely in wx, as it's sort of
a Windows-specific functionality as far as I know. I know in win32
you can use SetWindowPos() and pass it HWND_TOP (see
http://msdn.microsoft.com/en-us/library/ms633545(VS.85).aspx). So you
might have to use win32gui to use SetWindowPos(). You can use
wxWindow.getHandle() to get the HWND reference to pass as the first
argument to SetWindowPos.
Erik
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Re: Setting Focus
On Jun 13, 9:34 am, Hyuga [EMAIL PROTECTED] wrote: On Jun 12, 11:04 pm, Gandalf [EMAIL PROTECTED] wrote: You know these application like ICQ or winamp which stay at the front of the desktop as long as the user doesn't minimize it. I wont to do the same with my application in python. I still didn't manage to make pywinauto to auto set my window frame in focus reliability so I was hoping this will solve my problem. I'm working with WX lib on 2.5 python on Microsoft Windows XP I'm not sure if there's a way to do this purely in wx, as it's sort of a Windows-specific functionality as far as I know. I know in win32 you can use SetWindowPos() and pass it HWND_TOP (seehttp://msdn.microsoft.com/en-us/library/ms633545(VS.85).aspx). So you Sorry, I meant you actually want HWND_TOPMOST as the second argument to SetWindowPos(). That puts the window above all other windows and keeps it there. Erik -- http://mail.python.org/mailman/listinfo/python-list
Re: Grabbing previous iteration in a dict
On May 9, 5:10 am, [EMAIL PROTECTED] wrote:
I have a dictionary of which i'm itervalues'ing through, and i'll be
performing some logic on a particular iteration when a condition is
met with trusty .startswith('foo'). I need to grab the previous
iteration if this condition is met. I can do something with an extra
var to hold every iteration while iterating, but this is hacky and not
elegant.
Why is that so terrible?
previous = None
for key in mydict:
if key.starswith('foo') and previous is not None:
# ...do stuff...
previous = key
Doesn't seem too ugly to me.
Is there a mechanism whereby I can just index the dict value
subscripts like in an array? I could just rewind by 1 if so.
You can't rely on the keys in a dictionary being in any specific
order. But if you want a list of the keys you can just call
mydict.keys() which will give a copy of the dictionary's keys in a
list. Then you can iterate that and use it however you would use any
other list. Note that it's a copy though. It might help if you
better explained exactly what you need to do.
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Re: first time use of swig, python and c++ .. it's a mess ... please advice
On Feb 26, 3:38 pm, Eric von Horst [EMAIL PROTECTED] wrote:
Hi,
we have a third-party product that has a C++ api on HP-UX.
I would like be able to use the API in Python (as I remember Python is
good at doing this).
I have no experience with this so I Googled and tried to find some
info on what I had to do.
So, I installed Python 2.4.4 and Swig 1.3.33
The header file to the library is '/opt/OV/include/opcsvcapi.h'.
I created a SWIG file with the following content:
%module opcsvcapi
%{
/* Includes the header in the wrapper code */
#include /opt/OV/include/opcsvcapi.h
%}
/* Parse the header file to generate wrappers */
%include /opt/OV/include/opcsvcapi.h
Then I ran the cmd:
# swig -c++ -python opcsvcapi.i
with output:
/opt/OV/include/opcsvcapi.h:41: Warning(362): operator= ignored
/opt/OV/include/opcsvcapi.h:46: Warning(503): Can't wrap 'operator
Type' unless renamed to a valid identifier.
The result are two files:
opcsvcapi.py
opcsvcapi_wrap.cxx
I created a 'setup.py' file with the following content:
import distutils
from distutils.core import setup, Extension
setup(name = opcsvcapi,
version = 1.0,
ext_modules = [Extension(_opcsvcapi,
[opcsvcapi.i,opcsvcapi.cxx])])
Then I run: python setup.py build
This results in an extra file:
opcsvcapi_wrap.c and a 'build' directory
and the following errors:
running build
running build_ext
building '_opcsvcapi' extension
swigging opcsvcapi.i to opcsvcapi_wrap.c
swig -python -o opcsvcapi_wrap.c opcsvcapi.i
creating build
creating build/temp.hp-ux-B.11.11-9000-800-2.4
gcc -pthread -fno-strict-aliasing -DNDEBUG -g -O3 -Wall -Wstrict-
prototypes -fPIC -I/usr/local/include/python2.4 -c opcsvcapi_wrap.c -o
build/temp.hp-ux-B.11.11-9000-800-2.4/opcsvcapi_wrap.o
In file included from /usr/local/include/python2.4/Python.h:8,
from opcsvcapi_wrap.c:118:
/usr/local/include/python2.4/pyconfig.h:851:1: warning:
_POSIX_C_SOURCE redefined
command line:1:1: warning: this is the location of the previous
definition
In file included from opcsvcapi_wrap.c:2490:
/opt/OV/include/opcsvcapi.h:12:18: error: vector: No such file or
directory
In file included from opcsvcapi_wrap.c:2490:
/opt/OV/include/opcsvcapi.h:15: error: expected '=', ',', ';', 'asm'
or '__attribute__' before 'SvcAPI'
opcsvcapi_wrap.c: In function 'Swig_var_SvcAPI_set':
opcsvcapi_wrap.c:2505: error: 'SvcAPI' undeclared (first use in this
function)
opcsvcapi_wrap.c:2505: error: (Each undeclared identifier is reported
only once
opcsvcapi_wrap.c:2505: error: for each function it appears in.)
opcsvcapi_wrap.c:2505: error: 'namespace' undeclared (first use in
this function)
opcsvcapi_wrap.c:2505: error: expected expression before ')' token
opcsvcapi_wrap.c: In function 'init_opcsvcapi':
opcsvcapi_wrap.c:3064: error: 'Swig_var_SvcAPI_get' undeclared (first
use in this function)
error: command 'gcc' failed with exit status 1
and that's it.
Any idea what I am doing wrong?
Any help much appreciated
Kris
Well, the errors you got from the compiler are just confusing to me,
but I suspect it goes back to the warning you got from SWIG. Some
class in there is overriding the = operator, but since that can't be
done in Python, you need to give it some special instructions on how
to handle that.
For example, if you have Foo::operator=, in your SWIG header include a
line like:
%rename(assign) Foo::operator=
Then in the Python module, the Foo class will have an assign method.
Hyuga
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Re: Double underscores -- ugly?
On Feb 19, 4:01 am, Duncan Booth [EMAIL PROTECTED] wrote: Berwyn [EMAIL PROTECTED] wrote: Is it just me that thinks __init__ is rather ugly? Not to mention if __name__ == '__main__': ...? That ugliness has long been my biggest bugbear with python, too. The __name__ == '__main__' thing is something I always have to look up, every time I use it, too ... awkward. I'd settle for: hidden def init(self): # which could be extended to work for everything hidden x=3 ... And for __name__ == '__main__' how about: if sys.main(): ... Or even: @hidden def init(self): ... @main def mymainfunc(): ... I'd much rather type a few underscores than have to constantly use decorators. I don't see what's so ugly about __init__. To me it just looks like it's underscored, though maybe that comes from having worked with a lot of wikis. But I really don't find it an encumbrance, and the fact that it requires no special handling from the parser is just part of the beautiful simplicity of Python. Hyuga -- http://mail.python.org/mailman/listinfo/python-list
Re: re question
On Feb 7, 1:47 pm, Amit Gupta [EMAIL PROTECTED] wrote:
On Feb 7, 10:38 am, Amit Gupta [EMAIL PROTECTED] wrote:
Python'ites
I searched around google to find the answer to this question, but I
can't:
I have a named regexp : x = re.compile((?Pme[a-z]+))
What I want is an iterator, that can return me both the groupname
and the matched string, e.g:
m = x.search(aa)
Somehow, I want to get
{me : aa}, either as dictionary or some iterable form.
All I found is, I need to know the groupname to get the
corresponding match. Any help is appreciated.
A
Got It. re.search() has a function groupdict(), doing precisely that.
Just to be pedantic so that no one else who might read this does not
get confused, re.search() does not [have] a function groupdict().
re.search(), like many function in the re module returns a match
object. Match objects have a groupdict() method.
Hyuga
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Re: How to autorun a python script when a specific user logs on?
You know, I'm all for responsible parenting, and teaching kids about about responsible computer use, and even to an extent checking out things like browser history to make sure they're up to no good. But this is outright spying--a total invasion of privacy. Might as well put a hidden web cam in their room to make sure they aren't doing naughty things like looking at old-media porn or masturbating. Your friend should talk to his kids, not automatically assume their guilt. On Feb 5, 2:57 am, jack trades [EMAIL PROTECTED] wrote: I wrote a simple keylogger for a friend of mine that wants to keep track of his kid's (12 and 14 yr old boys) computer usage to make sure they aren't getting into the naughty parts of the web. The logger works great (source attached at bottom) but I ran into some troubles getting it to autorun on login. The method I tried was to add a registry entry using the function below. def autostartProgram(): Registers program with the windows registry to autostart on login os.system(r'reg add HKLM\software\microsoft\windows\currentversion\run /v logger /t REG_SZ /d C:\keylogger\logger.py') This starts the program on login, no problem. However I noticed that after logging out and back in on my dev (xp pro) machine that My Network Places was gone from my start menu. I restored the registry and tried again. It happened over and over. I also had problems with Winamp/Media Player after doing this (grrr I hate Windoze). Also I noticed that when you switch users using this method, it shows that there is 1 program running. While I'm not trying to be stealthy I don't want the kids poking around in his system (probably destroying it) trying to find the program that's running. How would I SAFELY start the program at login time for a specific user? I've been reading google about this for the past 5 hours and I'm stuck, please help. Note: I thought about registering it as a system service, but wouldn't that make the program start for any user that logs on? Thanks for sparing some time, Jack Trades PS. The source for the logger is below. I'll post the source for the reader when I'm finished if anyone's interested (I'll also post it to uselesspython when they're back up). Note: Currently this program must be stored in a folder named C:\keylogger\ (I won't post to uselesspython until I fix this, but it seems necessary when autostarting the program through the registry.) ## Windows Only Script!!! # ## logger.py | 2008-02-04 | Logs keystrokes and screenshots to disk ## ##Copyright (C) 2008, Jack Trades ## ##This program is free software: you can redistribute it and/or modify ##it under the terms of the GNU General Public License as published by ##the Free Software Foundation, either version 3 of the License, or ##(at your option) any later version. ## ##This program is distributed in the hope that it will be useful, ##but WITHOUT ANY WARRANTY; without even the implied warranty of ##MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ##GNU General Public License for more details. ## ##You should have received a copy of the GNU General Public License ##along with this program. If not, see http://www.gnu.org/licenses/ ## ## Recent Changes: ## Added quality setting to grabScreen ## Wrapped all functions in try/except blocks to silently pass over errors ## ## TODO: ## Write function to send data to secure ftp server in local network ## Write any errors to a text file # ## Requires: pyHook, win32all, PIL import pyHook import pythoncom import ImageGrab from time import time from threading import Timer # ## Start-Up # ## The full path is required when started automatically through windows registry ## Need to find a fix to allow relative paths (this way is UGLY!) folder = 'C:\\keylogger\\' filename = folder+'data\\'+str(time()) ## Each program start creates a new file skippedKeys = set( (0,) ) def offloadData(): Every time the program starts it should offload its log file and screenshots to another computer. pass # ## Keylogger # ## The logger skips over keys defined in the global variable *skippedKeys* def writeData(eventWindow, ascii): Appends each keystroke to file *filename* as defined at the top try: eventTime = time() f = open(filename, 'a') f.write(str( (ascii, eventTime, eventWindow) )+',') f.close() except: pass def onKeyboardEvent(event):
Re: Help needed
On Jan 10, 9:15 pm, tijo [EMAIL PROTECTED] wrote: Hi mate i need o do a python program to connect 2 systems using TCP/IP and UDP. Also i need to check the performance of these two protocols (how many bytes received and how much time took). I havent worked in python earlier and have no idea of this. Could someone pls help me. I created a program which can connect between 2 systems using these UDP and TCP/ IP protocols. I dont know how to check the rest like how many bytes send or how much time taken since this is part of my course work could someone please help me thanks in advance. tijo The standard library documentation, while lacking in some areas, is very much your friend here: From http://docs.python.org/lib/socket-objects.html (emphasis mine) send(string[, flags]) Send data to the socket. The socket must be connected to a remote socket. The optional flags argument has the same meaning as for recv() above. *Returns the number of bytes sent.* recv(bufsize[, flags]) Receive data from the socket. The return value is a string representing the data received. For timing you can probably use the timeit module (http:// docs.python.org/lib/module-timeit.html) but I'm not really sure how you're defining performance. I mean, I can already tell you that overall UDP will be faster, as it has much less overhead. Surely your course has covered this... Hyuga -- http://mail.python.org/mailman/listinfo/python-list
Re: Help with Scons
On Jan 11, 5:20 am, anush [EMAIL PROTECTED] wrote: Can anybody tell how I could go about running python scripts with scons. Have you tried reading the SCons user guide (http://www.scons.org/doc/ production/HTML/scons-user.html)? It's actually pretty good. I'm not too clear on what you're asking though. SCons scripts are written in Python (as is SCons itself)... Hyuga -- http://mail.python.org/mailman/listinfo/python-list
Re: help parsing ipv6 addresses and subnets
On Nov 8, 3:11 am, Thorsten Kampe [EMAIL PROTECTED] wrote: * Prabhu Gurumurthy (Wed, 07 Nov 2007 22:34:14 -0800) I would like to parse IPv6 addresses and subnet using re module in python. Just don't:http://pypi.python.org/pypi?%3Aaction=searchterm=ipv6 submit=search And even if you do end up doing the IPv6 parsing yourself (which you shouldn't), regular expressions would be the wrong approach--there's no way an RE can deal with replacing a :: with the correct number of zeroes, among other complications. Hyuga -- http://mail.python.org/mailman/listinfo/python-list
Re: python project ideas
On Oct 25, 12:09 am, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: hi to everyone I wondered if this might be the right place to ask for some ideas for python project for university. I'd like it to be something useful and web-based. And the project must be complete in 2-3 months by 2-3 person group. May be something useful for open source or python community ... Well, just post what you think could be appropriate ... Write a good, clean web-based music library/jukebox. This is something I've been thinking of doing for a while, but I welcome someone to beat me to the punch. There are a few such things out there already--the most active is probably Jinzora, but I find it to be bloated and slow, with a horribly cluttered interface. And I think there are some other projects out there, but most of them are abandoned. A simple, attractive interface would be good, with a built- in flash player, and UTF-8 support throughout. (and though this is a relatively minor detail, for god's sake if a file has both ID3v1 and ID3v2 tags, use the ID3v2 tags by default. Jinzora doesn't didn't do this last I tried and it was quite obnoxious). -- http://mail.python.org/mailman/listinfo/python-list
Re: Pull Last 3 Months
On Oct 18, 12:25 am, Gabriel Genellina [EMAIL PROTECTED] wrote: I prefer the calendar module in that case: py import locale py locale.setlocale(locale.LC_ALL, '') 'Spanish_Argentina.1252' py py import calendar py calendar.month_abbr[12] 'Dic' py def prev_months(since, howmany): ... return [calendar.month_abbr[(since.month-i-2) % 12 + 1] for i in range(how many)] ... py import datetime py prev_months(datetime.datetime(2005,2,10), 4) ['Ene', 'Dic', 'Nov', 'Oct'] py prev_months(datetime.datetime(2005,10,17), 3) ['Sep', 'Ago', 'Jul'] Ah, you beat me to it. I was going to point out that if you're going to be using month strings, you should use calendar, since it can also use the correct locale. Plus, it offers a ridiculously simple solution to this problem compared to all the others. Hyuga -- http://mail.python.org/mailman/listinfo/python-list
Re: Python module for making Quicktime or mpeg movies from images
On Oct 12, 3:53 pm, jeremito [EMAIL PROTECTED] wrote: NodeBox; nodebox.org GUI application that creates either PDFs or Quicktime vids from python code. Unix/Linux/MacOS. I actually found NodeBox in my googling. This seems to be a stand alone application. I need to be able to convert my images to a movie from my code I wrote myself. Why? Whether you're using a library or an external application, it's not code that you wrote yourself. There's shouldn't be any reason you couldn't call an application like mencoder from your program. Either way you're certainly not going to find anything written in pure Python for encoding video. -- http://mail.python.org/mailman/listinfo/python-list
Re: Howto Launch a windows application ?
On Oct 3, 5:39 pm, stef mientki [EMAIL PROTECTED] wrote: from subprocess import * cmd =[] cmd.append ( 'D:\\PIC-tools\\JALxxx\\jalv2_3.exe' ) cmd.append ( '-long-start' ) cmd.append ( '-d') cmd.append ( '-clear' ) cmd.append ( '-sD:\\PIC-tools\\JAL\\libs2' ) cmd.append ( 'd:\\pic-tools\\jal\\programs\\test_rs232\\test_rs232_hw.jal' ) cmd.append ( 'd:\\data_actueel\\d7_test_browser\\temp.log' ) This is sort of aside from your original question, but I should also point out how unnecessary all those 'cmd.append's are. You can initialize the list all at once simply like so: cmd =['D:\\PIC-tools\\JALxxx\\jalv2_3.exe', '-long-start', '-d', '-clear', '-sD:\\PIC-tools\\JAL\\libs2', 'd:\\pic-tools\\jal\\programs\\test_rs232\\test_rs232_hw.jal', 'd:\\data_actueel\\d7_test_browser\\temp.log'] Hyuga -- http://mail.python.org/mailman/listinfo/python-list
Re: Asking all python programmers.
On Aug 29, 11:09 am, sjpiii [EMAIL PROTECTED] wrote: You mean use correct spelling and grammar? But what about all the time we've spent creating cutesy little non-words like l8er? Actually, I'm less tolerant of those than of normal spelling and grammar errors because of the number of posters here for whom english is not their native language. What I find worst of all, however, are people for whom English is not their first language, *and* they write in lazy, slangy AOL-speak. Making mistakes is fine, and even being completely incomprehensible is bearable if it looks like an effort was made to use the language correctly. I don't know about anyone else, but when I'm learning a new language, spoken or programming, I try my best to use it is correctly as possible given my level of experience with it. Using slang and shorthand correctly really requires you to know what you're doing--sort of like optimizing. -- http://mail.python.org/mailman/listinfo/python-list
Re: self extracting zipefile (windows) and (standard module) zipefile
First of all, there's really no such thing as a self extracting zipefile. I mean, obviously you have to do something to unzip it. A file doesn't just execute itself. What you're dealing with is not a _zip file_. It's an executable that has a zip file bundled with it, and the code to unzip it, most likely into your current directory (though some such executables allow you to provide a path to unzip to). You'll have to execute it--there's no way you can operate on it like a normal zip file. On Aug 29, 7:53 am, Werner [EMAIL PROTECTED] wrote: Hi, I try to read (and extract) some self extracting zipefiles on a Windows system. The standard module zipefile seems not to be able to handle this. fName = rC:\tmp\mySelfExtratingFile.exe import zipfile zipefile.is_zipfile(fName)) False Is there a wrapper or has some one experience with other libaries to extract those files? Thanks in advance Werner -- http://mail.python.org/mailman/listinfo/python-list
Re: How to optimise this code?
On Aug 22, 4:52 am, David N Montgomery [EMAIL PROTECTED] wrote: unittest is the best choice for my needs and works perfectly in Eclipse. Unfortunately though it (and many other things) does not work under the application we have to use to run our python scripts. This leaves me with 'functionToCall = getattr(self, testCase%s % tc)'. This achieves the optimisation/simplification I had been looking for. Thank you once again. Just out of curiosity, what about your environment prevents you from using unittest? Hyuga -- http://mail.python.org/mailman/listinfo/python-list
Re: Symbolic Link
On Aug 19, 4:29 pm, mosscliffe [EMAIL PROTECTED] wrote: The source file is in an area which python can see, but not the browser. I am trying to make a link in a browser friendly area so I can use it to display an image file. You might want to try using an .htaccess file. Place a file called .htaccess in the browser friendly area and place in it the line: Options +FollowSymLinks Assuming your hosting service will allow that, then it should work. If not, then why not just copy the image files? Storage is cheap these days. Hyuga -- http://mail.python.org/mailman/listinfo/python-list
Re: i am new to python-Please somebody help
On Aug 2, 8:51 am, Steven D'Aprano [EMAIL PROTECTED] wrote: On Thu, 02 Aug 2007 09:31:43 +, cool.vimalsmail wrote: [snip] You would be better off actually writing a sensible subject line instead of grovelling. Subject: How to use gzip in Python? [beginner] Then, having written a good subject line, it might have suggested a good search string for Google: gzip python http://www.google.com.au/search?q=gzip+python The first two links found will answer your question. -- Steven. OT Unlike gregarican, I mostly agree with the content of your post. Except for your subject line suggestion. Why on earth would you recommend someone use the obnoxious How to __ ? question format? Yes, I know it's extremely common, but it's completely nonsensical English. Just try saying it out loud with an inquiring inflection on the last word. Sounds ridiculous doesn't it? At least without the question mark it means that the thread is on the topic of How to _. /OT -- http://mail.python.org/mailman/listinfo/python-list
Re: sqlite3 bug??
On Jun 17, 9:16 am, mark carter [EMAIL PROTECTED] wrote: Should I also explicitly close the cursor and connection, or is that taken care of automagically? Somebody correct me if I'm wrong, but I'm pretty sure that the Cursor and Connection objects properly clean themselves up when deallocated (when their reference count reaches 0), so not explicitly closing them isn't a terrible thing. In fact, I have code in which references to a db connection are passed around, so I have to be careful about explicitly closing the connection, lest it be in use by some other method somewhere. Maybe people will frown on this, but it's not uncommon. Hyuga -- http://mail.python.org/mailman/listinfo/python-list
Re: sqlite3 bug??
On Jun 18, 11:01 am, Hyuga [EMAIL PROTECTED] wrote: In fact, I have code in which references to a db connection are passed around, so I have to be careful about explicitly closing the connection, lest it be in use by some other method somewhere. Hate to reply to myself, but I should clarify that passing around a handle to an existing DB connection is necessary as a means of allowing multiple methods that write to the DB to operate atomically before calling commit(). So again, if you're doing something like that, you want to be absolutely certain before you close your connection that it's not in use elsewhere. Hyuga -- http://mail.python.org/mailman/listinfo/python-list
Re: otsu threshold in python
On Jun 6, 7:49 am, azrael [EMAIL PROTECTED] wrote: the otsu filter is a filter that takes a image and from its histogram calculates the values at which the image should be thresholded to acomplish an optimal seperation of a foregtround and background object. So I learned from the PDF I linked you to. Take a good look at it. The equation is fairly simple to begin with, and the paper shows how to simplify the calculation quite a bit. Also, the Wikipedia article at http://en.wikipedia.org/wiki/Otsu's_method even gives a simple pseudo-code implementation. I've tried it myself in Python, and it seems give good results. I didn't hear about, but I used it through the ImageJ tool. It gave me optimal results. I'm working on a project for my clases, and the last thing I need to accomplish my goal is this filter. Is there anyone who implemented it. Thanks Hyuga On Jun 5, 6:02 pm, Hyuga [EMAIL PROTECTED] wrote: On Jun 5, 10:19 am, azrael [EMAIL PROTECTED] wrote: Hy guys. I'd like to ask you for a favour. I tried several times to implement the otsu threshold filter in python. but I failed every time. I found the soucre code i n Java from the ImageJ project but I never worked in Java and there have been used some built in Java functions which I don't know how they behave. I also found the otsu threshold in the ia636 python module and would like only this filter and don't want to import this library. Is there anyone who wold like to help me. I need a function that takes a list of 256 elements as an argument and returns the threshold values for the threshold according to Otsu. In addvance, I don't expect someone to do my homework. I really tried it, I have been googling and didn't find a standalone function. I wasn't able write a standalone function because I don't understand the Otsu method. I just know that it works well and that I need it. If there is no one that wants to help me with this problem, can someone at least explain me in a detailed way how to implement it. Thanks What is the whole assignment meant to accomplish? Is the assignment to implement the Otsu method? If so, you shouldn't be trying to find library functions. Or is it just something you need for some larger task? I would ask exactly what problems you're running into, but: it, I have been googling and didn't find a standalone function. I wasn't able write a standalone function because I don't understand the Otsu method. I just know that it works well and that I need it. How do you know you need it? Did you learn about this in class? And if so, are you expected to understand it? I've never even heard of it, but I googled it, and found the fourth hit pretty good:http://homepages.inf.ed.ac.uk/rbf/CVonline/LOCAL_COPIES/MORSE/thresho... This gives a reasonable explanation. I couldn't tell you *exactly* why it works, but it's understandable enough from that that I can see that it should work, and to see how to implement it. Not to mention that the above PDF basically *gives* you the implementation for free (just make sure not to miss the recurrence relations at the end of the section on the Otsu method, or else you'll be screwing yourself). So give that a look and see if it helps. Hyuga -- http://mail.python.org/mailman/listinfo/python-list
Re: otsu threshold in python
On Jun 5, 10:19 am, azrael [EMAIL PROTECTED] wrote: Hy guys. I'd like to ask you for a favour. I tried several times to implement the otsu threshold filter in python. but I failed every time. I found the soucre code i n Java from the ImageJ project but I never worked in Java and there have been used some built in Java functions which I don't know how they behave. I also found the otsu threshold in the ia636 python module and would like only this filter and don't want to import this library. Is there anyone who wold like to help me. I need a function that takes a list of 256 elements as an argument and returns the threshold values for the threshold according to Otsu. In addvance, I don't expect someone to do my homework. I really tried it, I have been googling and didn't find a standalone function. I wasn't able write a standalone function because I don't understand the Otsu method. I just know that it works well and that I need it. If there is no one that wants to help me with this problem, can someone at least explain me in a detailed way how to implement it. Thanks What is the whole assignment meant to accomplish? Is the assignment to implement the Otsu method? If so, you shouldn't be trying to find library functions. Or is it just something you need for some larger task? I would ask exactly what problems you're running into, but: it, I have been googling and didn't find a standalone function. I wasn't able write a standalone function because I don't understand the Otsu method. I just know that it works well and that I need it. How do you know you need it? Did you learn about this in class? And if so, are you expected to understand it? I've never even heard of it, but I googled it, and found the fourth hit pretty good: http://homepages.inf.ed.ac.uk/rbf/CVonline/LOCAL_COPIES/MORSE/threshold.pdf This gives a reasonable explanation. I couldn't tell you *exactly* why it works, but it's understandable enough from that that I can see that it should work, and to see how to implement it. Not to mention that the above PDF basically *gives* you the implementation for free (just make sure not to miss the recurrence relations at the end of the section on the Otsu method, or else you'll be screwing yourself). So give that a look and see if it helps. Hyuga -- http://mail.python.org/mailman/listinfo/python-list
