Re: CPython on the Web
On Jan 3, 10:11 pm, John Nagle wrote: > On 1/1/2011 11:26 PM, azakai wrote: > > > Hello, I hope this will be interesting to people here: CPython running > > on the web, > > >http://syntensity.com/static/python.html > > > That isn't a new implementation of Python, but rather CPython 2.7.1, > > compiled from C to JavaScript using Emscripten and LLVM. For more > > details on the conversion process, seehttp://emscripten.org > > It's a cute hack, but it's about 1000 times slower than CPython. > > Try > > def cnt(n) : > j = 0 > for i in xrange(n) : > j = j + 1 > return(j) > > print(cnt(100)) > > with this. It will take 30 seconds or so to count to a million. > > John Nagle Yes, as I said, "the code isn't optimized (so don't expect good performance)" :) It can get much faster with more work. - azakai -- http://mail.python.org/mailman/listinfo/python-list
Re: Interrput a thread
On Jan 3, 6:17 pm, Adam Skutt wrote: > On Jan 3, 5:24 pm, Jean-Paul Calderone > wrote: > > > Of course. The whole point here is not about threads vs processes. > > It's about shared memory concurrency vs non-shared memory > > concurrency. You can implement both with threads and both with > > processes, but threads are geared towards shared memory and processes > > are geared towards non-shared memory. So what most people mean by > > "use processes" is "don't use shared memory". > > This is entirely my presumption, but I think if the OP were keenly > aware of the differences between thread and processes, it's pretty > likely he wouldn't have asked his question in the first place. > Fair enough. :) > Also, I've written lots and lots of "use processes" code on multiple > platforms, and much of it has used some sort of shared memory > construct. It's actually pretty common, especially in code bases with > a lot of history. Not all the world is Apache. > Hee hee, Apache. :) > Adam -- http://mail.python.org/mailman/listinfo/python-list
Re: CPython on the Web
On 1/1/2011 11:26 PM, azakai wrote: Hello, I hope this will be interesting to people here: CPython running on the web, http://syntensity.com/static/python.html That isn't a new implementation of Python, but rather CPython 2.7.1, compiled from C to JavaScript using Emscripten and LLVM. For more details on the conversion process, see http://emscripten.org It's a cute hack, but it's about 1000 times slower than CPython. Try def cnt(n) : j = 0 for i in xrange(n) : j = j + 1 return(j) print(cnt(100)) with this. It will take 30 seconds or so to count to a million. John Nagle -- http://mail.python.org/mailman/listinfo/python-list
Re: list 2 dict?
"Octavian Rasnita" writes: > If I want to create a dictionary from a list... > l = [1, 2, 3, 4, 5, 6, 7, 'a', 8, 'b'] dict(l[i:i+2] for i in xrange(0,len(l),2)) seems simplest to me. -- http://mail.python.org/mailman/listinfo/python-list
Re: CPython on the Web
FYI, The example http://syntensity.com/static/python.html works fine in Safari 4.1.3 on MacOS X Tiger (10.4.11). /Jean On Jan 3, 5:59 pm, azakai wrote: > On Jan 3, 12:23 pm, Gerry Reno wrote: > > > > > > > On 01/03/2011 03:10 PM, azakai wrote: > > > > On Jan 2, 5:55 pm, Gerry Reno wrote: > > > >> I tried printing sys.path and here is the output: > > > >> ['', '/usr/local/lib/python27.zip', '/usr/local/lib/python2.7/', > > >> '/usr/local/lib/python2.7/plat-linux2', > > >> '/usr/local/lib/python2.7/lib-tk', '/usr/local/lib/python2.7/lib-old', > > >> '/usr/local/lib/lib-dynload'] > > > >> Now, those paths must be on your machine because they are not on my > > >> client machine. But the interpreter is now running on MY machine. Well > > >> in a sandbox really. So how is that going to work? > > > > Yeah, those are the paths on the machine where the binary was compiled > > > (so, they are the standard paths on ubuntu). > > > > Anyhow the filesystem can't (and shouldn't) be accessed from inside a > > > browser page. > > > Well, the local filesystem could be accessible with the user's > > permission and this should be an option. > > Hmm, I think this might be possible with the HTML5 File API. Would > definitely be useful here. > > - azakai -- http://mail.python.org/mailman/listinfo/python-list
Re: list 2 dict?
An adaptation to Hrvoje Niksic's recipe
Use a dictionary comprehention instead of a list comprehension or
function call:
lyst = [1, 2, 3, 4, 5, 6, 7, 'a', 8, 'b']
it = iter( lyst )
dyct = {i:it.next() for i in it} # I'm using {} and not [] for those
with tiny fonts.
#print dyct
{8: 'b', 1: 2, 3: 4, 5: 6, 7: 'a'}
Of course check for an "even" number of elements to the original list
to avoid exceptions or dropping the last element on traps.
--
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Re: CPython on the Web
FireFox 3.6.13 on MacOS X Tiger (10.4.11) fails: Error: too much recursion Error: Modules is not defined Source File: http://synthensity.com/static/python.html /Jean On Jan 2, 11:26 pm, Wolfgang Strobl wrote: > azakai : > > >On Jan 2, 4:58 pm, pyt...@bdurham.com wrote: > >> Azakai/Gerry, > > >> > Errors when using Firefox 3.6.3: > > >> I'm running Firefox 3.6.1.3 and the interpreter is running fine. > > I guess that meant FIrefox 3.6.13 (without the last dot), the current > stable version. > > I'm using Firefox 3.6.13 (german) on Windowx XP (32bit, german) here, > and the interpreter is running fine, too. Same for Chrome 8.0.552.224. > > -- > Wir danken f r die Beachtung aller Sicherheitsbestimmungen -- http://mail.python.org/mailman/listinfo/python-list
Re: Python comparison matrix
On Mon, 3 Jan 2011, Alex Willmer wrote: > I've created a spreadsheet that compares the built ins, features and > modules of the CPython releases so far. For instance it shows: [...] > I gathered the data from the documentation at python.org. It's work in > progress so there are plenty of rough edges and holes, but I'd like to > get your opinions, feedback and suggestions. > - Would you find such a document useful? Yes, definitely. Great idea, thanks for doing this. > - What format(s) would be most useful to you (e.g. spreadsheet, pdf, web > page(s), database, wall chart, desktop background)? I would vote for html/web pages with pdf as an option (i.e. a link), if you find it easy enough to make. This probably means you would like to have the source in a form that allows generation of both pages and pdf without much trouble. In this case, it seems there are more than few options to choose from. Perhaps in a form of Python code doing the job, with data in hashtables? That would be so Pythonish :-). > - Are there other aspects/pages that you'd like to see included? > - Do you know of source(s) for which versions of CPython supported which > operating systems (e.g. the first and last Python release that works on > Windows 98 or Mac OS 9)? The best I've found so far is PEP 11 Nothing comes to my head ATM. Regards, Tomasz Rola -- ** A C programmer asked whether computer had Buddha's nature. ** ** As the answer, master did "rm -rif" on the programmer's home** ** directory. And then the C programmer became enlightened... ** ** ** ** Tomasz Rola mailto:tomasz_r...@bigfoot.com ** -- http://mail.python.org/mailman/listinfo/python-list
Re: String building using join
On Mon, Jan 3, 2011 at 3:07 AM, gervaz wrote:
> On 2 Gen, 19:14, Emile van Sebille wrote:
>>
>>
>> class Test:
>> def __init__(self, v1, v2):
>> self.v1 = v1
>> self.v2 = v2
>>
>> t1 = Test("hello", None)
>> t2 = Test(None, "ciao")
>> t3 = Test("salut", "hallo")
>> t = [t1, t2, t3]
>>
>> "\n".join([y for x in t for y in [x.v1,x.v2] if y])
>>
>>
>>
>
>
> Thanks Emile, despite that now the solution runs in quadratic time I
> guess. I could also provide a __str__(self) representation, but in my
> real code I don't have access to the class. Also using str() on an
> empty object (i.e. None), the representation is 'None'.
>
Since no one else has mentioned it, I'll just point out that Emile's
solution does not run in quadratic time. It has the same number of
operations as the originally posted code.
That str(None) results in "None" is not a problem because of the "if
y" test in the list comprehension.
--
regards,
kushal
--
http://mail.python.org/mailman/listinfo/python-list
Re: Multiple instances and wrong parental links
Mere are my ramblings of a novice (bad) Hobbyst programmer. You mentioned that your having a hard time coming up with a solution to your complex problem. Complex means you are doing lots of different things to different things all over the place where timing is an issue. First it seems you are trying to simplify your problem by creating a generic class you might call Element which is held in an ElementList class. Right? Or is it you would like you to create a new class for each unique element? If this is the case it would be because each unique element - behaves- differently. Is this the case? Or do all XML elements basically behave the same? If they behave the same you're confusing your design. A class represents a unique behavior. Remember instances can have unique attributes like "code" or "title". But I'm digressing. For example in your other discussion you posted at: https://groups.google.com/forum/#!topic/comp.lang.python/K9PinAbuCJk/discussion you say: So, an element like: Writers of the Future Or is the element structure?: "some value" Or is it like this? value Or like this? value value ... Or this, typical XML? value value ... value value ... And is nested or only one "sub" deep? Ask yourself why do you need to have a different class for each unique element type? Or in other words, why do you need a new class for each XML tag pair? If your elements are nested to some unknown depth, perhaps broaden your idea of your ElementList into an ElementTree. Take a look at the section "Basic Usage" midway down at url: http://effbot.org/zone/element-index.htm Or change you Market Class stucture(in your other discussion) to make it more dimensional by adding a tag attribute which would mark it as if it were a certain "class". class ElementNode(objec): def__init__(self, parent, elem) self.parent = parent# another elementNode object or None self.elem = elem # entire text block or just do offsets (i.e. file line numbers) self.tag = self.get_tag(elem) # market tag==class self.token = self.get_token(self) # "code" or whatever if variable self.sub_elems= self.get_subs(elem) # recursive ElementNodes; return a list or dict self.root = self.get_root(parent) # optional but handy # I like to use the root as the XML source; sometimes an XML file self.next = None # because I love double link lists # probably useful for that ObjectListView wxPython widget If in your case each Element does behave differently (ie has unique methods) then perhaps you should be looking at some other solution. Perhaps class factories or meta classes. I can't help you there. -- http://mail.python.org/mailman/listinfo/python-list
Re: CPython on the Web
On Jan 3, 12:23 pm, Gerry Reno wrote: > On 01/03/2011 03:10 PM, azakai wrote: > > > > > > > > > > > On Jan 2, 5:55 pm, Gerry Reno wrote: > > >> I tried printing sys.path and here is the output: > > >> ['', '/usr/local/lib/python27.zip', '/usr/local/lib/python2.7/', > >> '/usr/local/lib/python2.7/plat-linux2', > >> '/usr/local/lib/python2.7/lib-tk', '/usr/local/lib/python2.7/lib-old', > >> '/usr/local/lib/lib-dynload'] > > >> Now, those paths must be on your machine because they are not on my > >> client machine. But the interpreter is now running on MY machine. Well > >> in a sandbox really. So how is that going to work? > > > Yeah, those are the paths on the machine where the binary was compiled > > (so, they are the standard paths on ubuntu). > > > Anyhow the filesystem can't (and shouldn't) be accessed from inside a > > browser page. > > Well, the local filesystem could be accessible with the user's > permission and this should be an option. > Hmm, I think this might be possible with the HTML5 File API. Would definitely be useful here. - azakai -- http://mail.python.org/mailman/listinfo/python-list
Re: Python comparison matrix
Thank you Antoine, I've fixed those errors. Going by the docs, I have VMSError down as first introduced in Python 2.5. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python comparison matrix
On Tuesday, January 4, 2011 12:54:24 AM UTC, Malcolm wrote: > Alex, > > I think this type of documentation is incredibly useful! Thank you. > Is there some type of key which explains symbols like !, *, f, etc? There is a key, it's the second tab from the end, '!' wasn't documented and I forgot why I marked bytes() thusly, so I've removed it. -- http://mail.python.org/mailman/listinfo/python-list
Re: CPython on the Web
On Jan 3, 12:13 pm, de...@web.de (Diez B. Roggisch) wrote: > A fun hack. Have you bothered to compare it to the PyPy javascript > backend - perfomance-wise, that is? > Gerry already gave a complete and accurate answer to the status of this project in comparison to PyPy and pyjamas. Regarding performance, this hack is not currently fast, primarily because the code is not optimized yet. But through a combination of optimizations on the side of Emscripten (getting all LLVM optimizations to work when compiling to JS) and on the side of the browsers (optimizing accesses on typed arrays in JS, etc.), then I hope the code will eventually run quite fast, even comparably to C. - azakai -- http://mail.python.org/mailman/listinfo/python-list
Re: Python comparison matrix
Alex, I think this type of documentation is incredibly useful! Is there some type of key which explains symbols like !, *, f, etc? Thanks for sharing this work with the community. Malcolm -- http://mail.python.org/mailman/listinfo/python-list
Re: Python comparison matrix
On Mon, 3 Jan 2011 16:17:00 -0800 (PST) Alex Willmer wrote: > I've created a spreadsheet that compares the built ins, features and modules > of the CPython releases so far. For instance it shows: A couple of errors: - BufferError is also in 3.x - IndentationError is also in 3.x - object is also in 3.x - NotImplemented is not an exception type, it's a built-in singleton like None - you forgot VMSError (only on VMS) :-) Regards Antoine. -- http://mail.python.org/mailman/listinfo/python-list
Python comparison matrix
I've created a spreadsheet that compares the built ins, features and modules of the CPython releases so far. For instance it shows: - basestring was first introduced at version 2.3 then removed in version 3.0 - List comprehensions (PEP 202) were introduced at version 2.0. - apply() was a built in throughout the 1.x and 2.x series, but was deprecated in from 2.3 and removed in 3.0 - Generator functions were first introduced in 2.2 with __future__ import, from 2.3 they were fully supported https://spreadsheets.google.com/pub?key=0At5kubLl6ri7dHU2OEJFWkJ1SE16NUNvaGg2UFBxMUE The current version covers CPython 1.5 - 3.2 on these aspects: - Built in types and functions - Keywords - Modules - Interpreter switches and environment variables - Platforms, including shipped Python version(s) for major Linux distributions - Features/PEPs (incomplete) I gathered the data from the documentation at python.org. It's work in progress so there are plenty of rough edges and holes, but I'd like to get your opinions, feedback and suggestions. - Would you find such a document useful? - What format(s) would be most useful to you (e.g. spreadsheet, pdf, web page(s), database, wall chart, desktop background)? - Are there other aspects/pages that you'd like to see included? - Do you know of source(s) for which versions of CPython supported which operating systems (e.g. the first and last Python release that works on Windows 98 or Mac OS 9)? The best I've found so far is PEP 11 Regards and thanks, Alex -- http://mail.python.org/mailman/listinfo/python-list
Re: CPython on the Web
On Jan 2, 4:58 pm, pyt...@bdurham.com wrote: > Azakai/Gerry, > > > Errors when using Firefox 3.6.3: > firefox 3.6.13 openbsd i386 4.8 -current error console has some errors: editor not defined module not define too much recursion nothing interested happened on the web page, but wonderful project anyway -- http://mail.python.org/mailman/listinfo/python-list
Re: SUNLisp 2: Josh vs. Kenny Flamewars Galore!!
kenny crossposted bullshit over 5 newsgroups again: > […] JFTR: *PLONK* -- http://mail.python.org/mailman/listinfo/python-list
Re: Interrput a thread
On Jan 3, 5:24 pm, Jean-Paul Calderone wrote: > Of course. The whole point here is not about threads vs processes. > It's about shared memory concurrency vs non-shared memory > concurrency. You can implement both with threads and both with > processes, but threads are geared towards shared memory and processes > are geared towards non-shared memory. So what most people mean by > "use processes" is "don't use shared memory". > This is entirely my presumption, but I think if the OP were keenly aware of the differences between thread and processes, it's pretty likely he wouldn't have asked his question in the first place. Also, I've written lots and lots of "use processes" code on multiple platforms, and much of it has used some sort of shared memory construct. It's actually pretty common, especially in code bases with a lot of history. Not all the world is Apache. Adam -- http://mail.python.org/mailman/listinfo/python-list
Re: CPython on the Web
On 01/03/2011 05:55 PM, Diez B. Roggisch wrote: > Gerry Reno writes: > > >> On 01/03/2011 03:13 PM, Diez B. Roggisch wrote: >> >>> A fun hack. Have you bothered to compare it to the PyPy javascript >>> backend - perfomance-wise, that is? >>> >>> Diez >>> >>> >> I don't think that exists anymore. Didn't that get removed from PyPy >> about 2 years ago? >> > Ah, didn't know that. I was under the impression pyjamas was done with > it. Apparently, that's wrong: > > http://pyjs.org/ > > But then I re-phrase my question: how does this relate to pyjamas/pyjs? > > Diez > >From what I've seen so far: Pyjamas is taking your python code and converting it into javascript so that your python code (converted to javascript) can run in a browser. CPotW is taking the whole python interpreter and converting the interpreter into javascript so that the python interpreter runs in the browser. Your python code remains as python code. Regards, Gerry -- http://mail.python.org/mailman/listinfo/python-list
Re: Interrput a thread
On Jan 3, 5:05 pm, gervaz wrote: > Regarding the case pointed out by Adam I think the best way to > deal with it is to create a critical section so that the shared memory > will be updated in an atomic fashion. Ok, so if the OS kills the process between taking the lock and releasing it, what are you going to do? Handled naively, you can end up in a deadlock situation[1]. If a process has locked a semaphore and then terminates, the semaphore retains its current value: all other processes waiting on the semaphore will still be waiting, and any new processes that access the semaphore will wait as well. In short, if a process holding a semaphore dies, you have to manually unlock it. For signals that the process intends to handle, you can always disable them before taking the lock and reenable them after releasing it. Or, you can install signal handlers in each process that ensure everything is properly cleaned up when the signal is delivered. Which solution is right depends on what you're doing. For signals you don't intend to handle (SIGSEGV) or cannot handle (SIGKILL) there's not much you can do. It's potentially dangerous to continue on after a child has received such a signal, so the right solution may be to literally do nothing and let the deadlock occur. If you must do cleanup, it must be done carefully. The key thing to understand is that the problems with killing threads haven't gone away: delivering the "please die" message isn't the hard part; it's safely cleaning up the thread in such a way it doesn't break the rest of the application! This problem still exists if you replace threads with processes (assuming you're using shared memory). As such, the better thing to do, if possible, is to avoid shared memory and use constructs like pipes and sockets for I/O. They have much better defined failure semantics, and do allow you a modicum of fault isolation. At the very least, graceful shutdown is much easier. HTH, Adam [1] For SIGINT from the terminal, the "right thing" /might/ happen. Strong emphasis on the might. -- http://mail.python.org/mailman/listinfo/python-list
Re: Interrput a thread
gervaz writes: > On 3 Gen, 22:17, Adam Skutt wrote: >> On Jan 3, 4:06 pm, Jean-Paul Calderone >> wrote: >> >> >> >> > > Multiple processes, ok, but then regarding processes' interruption >> > > there will be the same problems pointed out by using threads? >> >> > No. Processes can be terminated easily on all major platforms. See >> > `os.kill`. >> >> Yes, but that's not the whole story, now is it? It's certainly much >> more reliable and easier to kill a process. It's not any easier to do >> it and retain defined behavior, depending on exactly what you're >> doing. For example, if you kill it while it's in the middle of >> updating shared memory, you can potentially incur undefined behavior >> on the part of any process that can also access shared memory. >> >> In short, taking a program that uses threads and shared state and >> simply replacing the threads with processes will likely not gain you a >> thing. It entirely depends on what those threads are doing and how >> they do it. >> >> Adam > > As per the py3.1 documentation, os.kill is only available in the Unix > os. Regarding the case pointed out by Adam I think the best way to > deal with it is to create a critical section so that the shared memory > will be updated in an atomic fashion. Btw it would be useful to take a > look at some actual code/documentation in order to understand how > others dealt with the problem... There is the multiprocessing module. It's a good start, and works cross-platform. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: CPython on the Web
Gerry Reno writes: > On 01/03/2011 03:13 PM, Diez B. Roggisch wrote: >> >> A fun hack. Have you bothered to compare it to the PyPy javascript >> backend - perfomance-wise, that is? >> >> Diez >> > > I don't think that exists anymore. Didn't that get removed from PyPy > about 2 years ago? Ah, didn't know that. I was under the impression pyjamas was done with it. Apparently, that's wrong: http://pyjs.org/ But then I re-phrase my question: how does this relate to pyjamas/pyjs? Diez -- http://mail.python.org/mailman/listinfo/python-list
SUNLisp 2: Josh vs. Kenny Flamewars Galore!!
All they agree on is Common Lisp! Come join the Yobbos of MCNA at the Frog & Toad for booze, vino, and great food and knock down drag out debates galore on everything from Cells to Lisp IDEs: When: Tomorrow Tuesday, at 7pm Where: http://www.thefrogandtoadpub.com/ HK -- http://mail.python.org/mailman/listinfo/python-list
Re: Interrput a thread
On Jan 3, 4:17 pm, Adam Skutt wrote: > On Jan 3, 4:06 pm, Jean-Paul Calderone > wrote: > > > > > > Multiple processes, ok, but then regarding processes' interruption > > > there will be the same problems pointed out by using threads? > > > No. Processes can be terminated easily on all major platforms. See > > `os.kill`. > > Yes, but that's not the whole story, now is it? It's certainly much > more reliable and easier to kill a process. It's not any easier to do > it and retain defined behavior, depending on exactly what you're > doing. For example, if you kill it while it's in the middle of > updating shared memory, you can potentially incur undefined behavior > on the part of any process that can also access shared memory. Then don't use shared memory. > > In short, taking a program that uses threads and shared state and > simply replacing the threads with processes will likely not gain you a > thing. It entirely depends on what those threads are doing and how > they do it. > Of course. The whole point here is not about threads vs processes. It's about shared memory concurrency vs non-shared memory concurrency. You can implement both with threads and both with processes, but threads are geared towards shared memory and processes are geared towards non-shared memory. So what most people mean by "use processes" is "don't use shared memory". Jean-Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: Interrput a thread
On 3 Gen, 22:17, Adam Skutt wrote: > On Jan 3, 4:06 pm, Jean-Paul Calderone > wrote: > > > > > > Multiple processes, ok, but then regarding processes' interruption > > > there will be the same problems pointed out by using threads? > > > No. Processes can be terminated easily on all major platforms. See > > `os.kill`. > > Yes, but that's not the whole story, now is it? It's certainly much > more reliable and easier to kill a process. It's not any easier to do > it and retain defined behavior, depending on exactly what you're > doing. For example, if you kill it while it's in the middle of > updating shared memory, you can potentially incur undefined behavior > on the part of any process that can also access shared memory. > > In short, taking a program that uses threads and shared state and > simply replacing the threads with processes will likely not gain you a > thing. It entirely depends on what those threads are doing and how > they do it. > > Adam As per the py3.1 documentation, os.kill is only available in the Unix os. Regarding the case pointed out by Adam I think the best way to deal with it is to create a critical section so that the shared memory will be updated in an atomic fashion. Btw it would be useful to take a look at some actual code/documentation in order to understand how others dealt with the problem... Ciao, Mattia -- http://mail.python.org/mailman/listinfo/python-list
Re: CPython on the Web
On 01/03/2011 03:13 PM, Diez B. Roggisch wrote: > > A fun hack. Have you bothered to compare it to the PyPy javascript > backend - perfomance-wise, that is? > > Diez > I don't think that exists anymore. Didn't that get removed from PyPy about 2 years ago? Regards, Gerry -- http://mail.python.org/mailman/listinfo/python-list
Re: Interesting bug
On Jan 2, 12:22 am, Daniel Fetchinson wrote: > An AI bot is playing a trick on us. Yes, it appears that the mystery is solved: Mark V. Shaney is alive and well and living in Bangalore :-) -- http://mail.python.org/mailman/listinfo/python-list
Re: CPython on the Web
On 01/03/2011 03:10 PM, azakai wrote: > On Jan 2, 5:55 pm, Gerry Reno wrote: > >> I tried printing sys.path and here is the output: >> >> ['', '/usr/local/lib/python27.zip', '/usr/local/lib/python2.7/', >> '/usr/local/lib/python2.7/plat-linux2', >> '/usr/local/lib/python2.7/lib-tk', '/usr/local/lib/python2.7/lib-old', >> '/usr/local/lib/lib-dynload'] >> >> Now, those paths must be on your machine because they are not on my >> client machine. But the interpreter is now running on MY machine. Well >> in a sandbox really. So how is that going to work? >> >> > Yeah, those are the paths on the machine where the binary was compiled > (so, they are the standard paths on ubuntu). > > Anyhow the filesystem can't (and shouldn't) be accessed from inside a > browser page. Well, the local filesystem could be accessible with the user's permission and this should be an option. Regards, Gerry -- http://mail.python.org/mailman/listinfo/python-list
Re: Interrput a thread
On Jan 3, 4:06 pm, Jean-Paul Calderone wrote: > > > Multiple processes, ok, but then regarding processes' interruption > > there will be the same problems pointed out by using threads? > > No. Processes can be terminated easily on all major platforms. See > `os.kill`. > Yes, but that's not the whole story, now is it? It's certainly much more reliable and easier to kill a process. It's not any easier to do it and retain defined behavior, depending on exactly what you're doing. For example, if you kill it while it's in the middle of updating shared memory, you can potentially incur undefined behavior on the part of any process that can also access shared memory. In short, taking a program that uses threads and shared state and simply replacing the threads with processes will likely not gain you a thing. It entirely depends on what those threads are doing and how they do it. Adam -- http://mail.python.org/mailman/listinfo/python-list
Re: Interrput a thread
On Jan 3, 3:22 pm, gervaz wrote: > On 3 Gen, 17:47, de...@web.de (Diez B. Roggisch) wrote: > > > > > gervaz writes: > > > On 31 Dic 2010, 23:25, Alice Bevan–McGregor > > > wrote: > > >> On 2010-12-31 10:28:26 -0800, John Nagle said: > > > >> > Even worse, sending control-C to a multi-thread program > > >> > is unreliable in CPython. See "http://blip.tv/file/2232410"; > > >> > for why. It's painful. > > > >> AFIK, that has been resolved in Python 3.2 with the introduction of an > > >> intelligent thread scheduler as part of the GIL release/acquire process. > > > >> - Alice. > > > > Ok, but then suppose I have multiple long running threads that I want > > > to delete/suspend because they are tooking too much time, which > > > solution do you propose? > > > If possible, use multiple processes instead. > > > Diez- Nascondi testo citato > > > - Mostra testo citato - > > Multiple processes, ok, but then regarding processes' interruption > there will be the same problems pointed out by using threads? > No. Processes can be terminated easily on all major platforms. See `os.kill`. Jean-Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: Interrput a thread
On 3 Gen, 17:47, de...@web.de (Diez B. Roggisch) wrote: > gervaz writes: > > On 31 Dic 2010, 23:25, Alice Bevan–McGregor > > wrote: > >> On 2010-12-31 10:28:26 -0800, John Nagle said: > > >> > Even worse, sending control-C to a multi-thread program > >> > is unreliable in CPython. See "http://blip.tv/file/2232410"; > >> > for why. It's painful. > > >> AFIK, that has been resolved in Python 3.2 with the introduction of an > >> intelligent thread scheduler as part of the GIL release/acquire process. > > >> - Alice. > > > Ok, but then suppose I have multiple long running threads that I want > > to delete/suspend because they are tooking too much time, which > > solution do you propose? > > If possible, use multiple processes instead. > > Diez- Nascondi testo citato > > - Mostra testo citato - Multiple processes, ok, but then regarding processes' interruption there will be the same problems pointed out by using threads? Mattia -- http://mail.python.org/mailman/listinfo/python-list
Re: CPython on the Web
azakai writes: > Hello, I hope this will be interesting to people here: CPython running > on the web, > > http://syntensity.com/static/python.html > > That isn't a new implementation of Python, but rather CPython 2.7.1, > compiled from C to JavaScript using Emscripten and LLVM. For more > details on the conversion process, see http://emscripten.org A fun hack. Have you bothered to compare it to the PyPy javascript backend - perfomance-wise, that is? Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: CPython on the Web
On Jan 2, 5:55 pm, Gerry Reno wrote: > I tried printing sys.path and here is the output: > > ['', '/usr/local/lib/python27.zip', '/usr/local/lib/python2.7/', > '/usr/local/lib/python2.7/plat-linux2', > '/usr/local/lib/python2.7/lib-tk', '/usr/local/lib/python2.7/lib-old', > '/usr/local/lib/lib-dynload'] > > Now, those paths must be on your machine because they are not on my > client machine. But the interpreter is now running on MY machine. Well > in a sandbox really. So how is that going to work? > Yeah, those are the paths on the machine where the binary was compiled (so, they are the standard paths on ubuntu). Anyhow the filesystem can't (and shouldn't) be accessed from inside a browser page. I think we will implement a minimal virtual filesystem here, just enough for stuff to work. The actual implementation would use HTML5 features like local storage etc. - azakai -- http://mail.python.org/mailman/listinfo/python-list
Re: Interrput a thread
gervaz writes: > On 31 Dic 2010, 23:25, Alice Bevan–McGregor > wrote: >> On 2010-12-31 10:28:26 -0800, John Nagle said: >> >> > Even worse, sending control-C to a multi-thread program >> > is unreliable in CPython. See "http://blip.tv/file/2232410"; >> > for why. It's painful. >> >> AFIK, that has been resolved in Python 3.2 with the introduction of an >> intelligent thread scheduler as part of the GIL release/acquire process. >> >> - Alice. > > Ok, but then suppose I have multiple long running threads that I want > to delete/suspend because they are tooking too much time, which > solution do you propose? If possible, use multiple processes instead. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there anyway to run JavaScript in python?
crow writes: > Hi, I'm writing a test tool to simulate Web browser. Is there anyway > to run JavaScript in python? Thanks in advance. Not really. Yes, you can invoke spidermonkey. But the crucial point about running JS is not executing JS, it's about having the *DOM* of the browser available. Which spidermonkey obviously hasn't. So, I recommend using Selenium. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: String building using join
Hello, On Sun, Jan 02, 2011 at 10:11:50AM -0800, Alex Willmer wrote: > def prg3(l): > return '\n'.join([str(x) for x in l if x]) just one fix (one fix one fix one fix): return '\n'.join([str(x) for x in l if x is not None]) -- With best regards, xrgtn -- http://mail.python.org/mailman/listinfo/python-list
Arisingsoft provides the Norton antivirus all in one security suite.
hai, Uses : The package includes a personal firewall, phishing protection and the ability to detect and remove malware. Norton 360 is compatible with 32-bit editions of Windows XP and 32-bit or 64-bit editions of Windows Vista.Windows 7 support has been added. Reviews cited Norton 360's low resource usage, relative to Norton Internet Security 2007, and phishing protection. http://www.arisingsoft.com/2010_11_14_archive.html http://www.arisingsoft.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: list 2 dict?
On Jan 2, 3:18 pm, "Octavian Rasnita" wrote:
> Hi,
>
> If I want to create a dictionary from a list, is there a better way than the
> long line below?
>
> l = [1, 2, 3, 4, 5, 6, 7, 'a', 8, 'b']
>
> d = dict(zip([l[x] for x in range(len(l)) if x %2 == 0], [l[x] for x in
> range(len(l)) if x %2 == 1]))
>
> print(d)
>
> {8: 'b', 1: 2, 3: 4, 5: 6, 7: 'a'}
>
> Thanks.
>
> Octavian
this is efficient
l = [1,2,3,4,5,6]
>>> dict(izip(islice(l,0,len(l),2),islice(l,1,len(l),2)))
{1: 2, 3: 4, 5: 6}
--
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A quesstion with matplotlib
Dear all, I have a quesstion about change the width of the ylabel.You know the width of the ylabel is relaete to the x axi,how can i change the width of the ylabel not depend on the width of the x-axis? Thank you! George -- http://mail.python.org/mailman/listinfo/python-list
Re: Tkinter: The good, the bad, and the ugly!
From: "Hank Fay" Subject: Re: Tkinter: The good, the bad, and the ugly! > That (the desktop app issue) was the big game-change for me. It looks like a > desktop app, it acts like a desktop app, and our enterprise customers would > be delighted to a) have no installs to do for fat clients; or b) not have to > run a TS or Citrix farm. > It looks like a desktop app, but it doesn't fully act like a desktop app. Not all the computer users are using a mouse and not all of them can see, but the good desktop apps are very accessible for those users who can't do those things. Octavian -- http://mail.python.org/mailman/listinfo/python-list
