xlutils 1.4.0 released!
Hi All, I'm pleased to announce a new release of xlutils. This is a small collection of utilities that make use of both xlrd and xlwt to process Microsoft Excel files. The changes for this release are as follows: - Add sheet density information and onesheet option to xlutils.margins. - Reduced the memory footprint of xlutils.filter.ColumnTrimmer at the expense of speed. - Fixed incorrect warnings about boolean cells in xlutils.filter.ErrorFilter. xlwt has always supported boolean cells. - xlutils.filter.BaseReader now opens workbooks with on_demand = True - Added support for xlrd Books opened with on_demand as True passed to open_workbook. - Fixed bug when copying error cells. - Requires the latest versions of xlrd (0.7.1) and xlwt (0.7.2). To find out more, please read here: http://www.simplistix.co.uk/software/python/xlutils In case you're not aware, xlrd and xlwt are two excellent pure-python libraries for reading and writing Excel files. They run on any platform and, likely, any implementation of Python without the need for horrific things like binding to Excel via COM and so needing a Windows machine. If you use any of xlrd, xlwt or xlutils, the following google group will be of use: http://groups.google.com.au/group/python-excel Hope some of this is of interest, I'd love to hear from anyone who ends up using it! cheers, Chris -- Simplistix - Content Management, Zope Python Consulting - http://www.simplistix.co.uk -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
[ANN] Pyjamas 0.6 Web Widget Set and python-to-javascript Compiler released
Pyjamas 0.6 is finally out: many thanks to everyone who has contributed. Special thanks to Kees Bos; Bernd, Bernd and Jurgen from LovelySystems.com; the people who showed an interest in Pyjamas at EuroPython 2009; and especially to everyone who has helped during the pre-releases, with testing and bugreports over the past few weeks. For a full list of contributors, see CREDITS. Downloads: - http://code.google.com/p/pyjamas/downloads http://pypi.python.org/pypi/Pyjamas http://sf.net/projects/pyjamas Pyjamas --- Pyjamas is a port of Google Web Toolkit to Python, and thus enables the development of Rich Media AJAX applications in Python, with no need for special browser plugins. Pyjamas contains a stand-alone python-to-javascript compiler, and also a Widget Set API that looks very similar to Desktop Widget Set APIs (such as PyQT4 or PyGTK2). For more information, see: http://pyjs.org http://pyjs.org/FAQ.html http://pyjs.org/features.html Known bugs: http://code.google.com/p/pyjamas/issues #227, #228, #229, #230 and #232 Pyjamas-Desktop --- Pyjamas runs your application in a Web Browser (as javascript); Pyjamas-Desktop runs exactly the same python application on the Desktop (as python) http://pyjd.org Release 0.6 of Pyjamas also incorporates Pyjamas-Desktop directly into the Pyjamas Distribution. To use Pyjamas-Desktop there are three choices, with more planned [MacOSX PyObjC; KDE's PyKHTML]. 1) - XULRunner install hulahop and python-xpcom. hulahop is distributed with both Debian and Ubuntu; python-xpcom is part of XULRunner and is also distributed with both Debian and Ubuntu. Other users should investigate the installation instructions for python-xpcom and hulahop for the operating system of their choice on the appropriate web sites. GNU/Linux, FreeBSD and other POSIX systems are strongly advised to use XULRunner for Pyjamas-Desktop: it is the most stable of the PyJD ports. 2) - PyWebKitGtk you will need a patched version of pywebkitgtk: http://code.google.com/p/pywebkitgtk/issues/detail?id=13 you will need a patched version of webkit: http://github.com/lkcl/webkit/16401.master Detailed build instructions are available here: http://wiki.github.com/lkcl/webkit/helping-with-16401master 3) - MSHTML (experimental!) For Windows users, all that's required, other than installing python and Internet Explorer, is one further package: Win32 comtypes. Win32 comtypes can be downloaded here: * http://sourceforge.net/projects/comtypes/ The MSHTML version primarily works. Reports using IE8's MSHTML engine would be appreciated. Known bugs: the use of Tab to cycle through Keyboard Focus elements is ineffective; onkeyup and onkeydown events are unresponsive, but oddly onkeypress event handling works. -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
Re: difference between 2 arrays
Re ! Juste pour signaler qu'il existe un newsgroup en français sur Python, qui permet de recevoir des réponses en français (donc plus complètes/détaillées). @-salutations -- Michel Claveau -- http://mail.python.org/mailman/listinfo/python-list
can't retrieve data from pyxml
well, i need to retrive data from the following line of xml. xs:element name=tblTreacherCollins.Microtia msdata:Caption=Microtia type=xs:string minOccurs=0 / i need the Caption and the type data. is any one out there help me doing that? thanks, Sakib -- http://mail.python.org/mailman/listinfo/python-list
Re: Using a Callback Function - ftplib
On Aug 18, 6:02 am, Nitebirdz nitebi...@sacredchaos.com wrote: On Mon, Aug 17, 2009 at 11:10:25AM -0700, seldan24 wrote: I didn't even notice the higher level methods. I changed the retrieval line to: ftp.nlst(testfile*.txt) This works great. The result is even captured in an array. I really have no idea what the difference between a LIST and NLST is within FTP. Never delved that deep into it. I did notice that an NLST will return a specific FTP code if a file doesn't exist, whereas a LIST doesn't. So, I ended up using NLST as that'll generate an ftplib.error_perm exception. Based on if the job cares if a file is not available or not (some do, some don't), I'll either exit, or continue on with the file loop. The following thread from a NetBSD mailing list may help clarify this issue: http://mail-index.netbsd.org/netbsd-users/2001/01/30/0016.html NLST returns a machine-readable list of names, while LIST returns a human-readable list. Hene the presence of the FTP code in the case of NLST. Nitebirdz, Thanks for the information. I knew it stood for 'named list' but had no idea how that differed from the standard. I appreciate the link. -- http://mail.python.org/mailman/listinfo/python-list
Re: can't retrieve data from pyxml
Sakib schrieb: well, i need to retrive data from the following line of xml. xs:element name=tblTreacherCollins.Microtia msdata:Caption=Microtia type=xs:string minOccurs=0 / i need the Caption and the type data. is any one out there help me doing that? That's not XML. It lacks namespace-declarations. So no XML-parser will (or should) grok it. Also, to get help here it's better to show what you already tried, instead of simply asking others to do your work for you. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: Code formatting question: conditional expression
BTW, from the (admittedly few) responses to my original post, it seems there's some sentiment that conditional expressions are a non-Pythonic misfeature. Interesting ... No. I love them. But not if they are so large that they stretch over several lines (or to many columns). foo = bar if cond else baz is more than fine for me. But foo = I_need_to_do_something_really_complicated_here() if cond else baz isn't, because one doesn't grasp as easily in one look that we're talking a ternary operator here. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: Need cleanup advice for multiline string
Simon Forman sajmik...@gmail.com writes: On Tue, Aug 18, 2009 at 8:42 PM, Ben Finneyben+pyt...@benfinney.id.au wrote: We're all unified by our humanity. Bringing any god into the picture is surely counter to any goals of unity. Unity in humanity is, to my way of thinking, the same as Unity in God. Then you're playing Humpty-Dumpty games with words. You know very well that “God” has established meanings entirely different from “humanity”, and those meanings played a part in your choice of that word. I maintain that you can't consistently make a declaration in favour of human unity and unfounded religious assertions. I think Unity, like None, is a built-in singleton, so to speak. This is white noise. We are one family. Agreed. 3 I think we can peaceably leave it at that. -- \“Spam will be a thing of the past in two years' time.” —Bill | `\ Gates, 2004-01-24 | _o__) | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: Code formatting question: conditional expression
Richard Brodie a écrit : John Posner jjpos...@optimum.net wrote in message news:mailman.26.1250604346.2854.python-l...@python.org... if total P.BASE: excessblk = Block(total - P.BASE, srccol, carry_button_suppress=True) else: excessblk = None I wonder if it is appropriate to replace the None sentinel with one that is an instance of Block() e.g. size = total - P.BASE excessblk = Block(size, srccol, carry_button_suppress=True, empty_block=(size = 0) ) In which case the last param is possibly redundant - the Block object knows its size, so it might be able to know by itself if it's empty. NB : please notice the 'possibly' and 'might' cautions !-) -- http://mail.python.org/mailman/listinfo/python-list
NOOB: Developing using python on two different computers
Hi there, Occasionally I have to develop on two different computers, and I was wondering if there was a way to copy the python environment from one to the other? Access to the data is trivial (networked database) but various packages etc exist on one computer, and I want to ensure I have everything package-wise on the other. Both are windows machines (native windows box and a Macbook with VMWare running XP)... Is it as simple as copying the Python directory, or is there a script I can run that will tell me what packages are installed on the native windows box and then I can use easy_install to update the VM partition on the Macbook? Much obliged for any help. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to create functors?
Terry Reedy a écrit :
Robert Dailey wrote:
I'm using Python 2.6. And using the legacy syntax in the lambda does
not work either. I want to avoid using a def if possible. Thanks.
In Python, writing
name = lambda arg: expr
instead of
def name(arg): return expr
is all negative and no positive and should be avoided.
Except that def is a statement, and as such can't be used as a named
params when calling a function expecting a callback, ie:
vroom = some_dead('parrot', name=lambda arg: exp)
(notice the 'name = lambda arg: exp' ?-)
Ok, nitpicking. Me ---[]
g
--
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Re: difference between 2 arrays
On Aug 19, 6:56 pm, Michel Claveau - MVPenleverlesx_xx...@xmclavxeaux.com wrote: See the module sets See especially the notice at the front of the current sets doc which says deprecated since 2.6 and the comparison down the end which explains why the built-in set() and frozenset() are better than the sets module. Starting now to use the sets module is not a good idea unless the OP is stuck on using Python 2.3 . -- http://mail.python.org/mailman/listinfo/python-list
Re: Help with libxml2dom
On 19 Aug, 13:55, Nuno Santos nuno.hespan...@gmail.com wrote: I have just started using libxml2dom to read html files and I have some questions I hope you guys can answer me. [...] table = body.firstChild table.nodeName u'text' #?! Why!? Shouldn't it be a table? (1) You answer this yourself just below. table = body.firstChild.nextSibling #why this works? is there a text element hidden? (2) table.nodeName u'table' Yes, in the DOM, the child nodes of elements include text nodes, and even though one might regard the whitespace before the first child element and that appearing after the last child element as unimportant, the DOM keeps it around in case it really is important. [...] It seems like sometimes there are some text elements 'hidden'. This is probably a standard in DOM I simply am not familiar with this and I would very much appreciate if anyone had the kindness to explain me this. Well, the nodes are actually there: they're whitespace used to provide the indentation in your example. I recommend using XPath to get actual elements: table = body.xpath(*)[0] # get child elements and then select the first Although people make a big song and dance about the DOM being a nasty API, it's quite bearable if you use it together with XPath queries. Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: Parallelization in Python 2.6
On 2009-08-19, Stefan Behnel stefan...@behnel.de wrote: Dennis Lee Bieber wrote: If they are number crunchers (CPU-bound) and don't make use of binary extension libraries that release the GIL (for the most common Python implementation), they'll run faster being called in sequence since you won't have the overhead of task switching. ... unless, obviously, the hardware is somewhat up to date (which is not that uncommon for number crunching environments) and can execute more than one thing at once. Even with multiple processors, it'll still be faster to call them sequentially in a single thread than run them sequentially in multiple threads with the GIL serializing them. -- Grant Edwards grante Yow! Gibble, Gobble, we at ACCEPT YOU ... visi.com -- http://mail.python.org/mailman/listinfo/python-list
Re: difference between 2 arrays
On Aug 19, 1:48 pm, Pierre pierre.gaill...@gmail.com wrote: Hello, I would like to know how to find the difference (set operation) between 2 arrays : a = array([1,2, 3,2,5,2]) b = array([1,2]) I want a - b = [3,5] Well, the equivalence of setdiff in matlab... I thought a.difference(b) could work, but no : AttributeError: 'numpy.ndarray' object has no attribute 'difference' Thanks ! Hi, Here I have given my logic, check whether it helps for you a = [1,2, 3,2,5,2] b = [1,2] j = 0 dif = [] for i in range(len(a)) : if a[i] not in b: dif.append(a[i]) j += 1 print dif[k] Thanks Baalu -- http://mail.python.org/mailman/listinfo/python-list
Re: difference between 2 arrays
On Aug 19, 1:48 pm, Pierre pierre.gaill...@gmail.com wrote: Hello, I would like to know how to find the difference (set operation) between 2 arrays : a = array([1,2, 3,2,5,2]) b = array([1,2]) I want a - b = [3,5] Well, the equivalence of setdiff in matlab... I thought a.difference(b) could work, but no : AttributeError: 'numpy.ndarray' object has no attribute 'difference' Thanks ! Hi, Here I have given my logic, check whether it helps for you a = [1,2, 3,2,5,2] b = [1,2] j = 0 dif = [] for i in range(len(a)) : if a[i] not in b: dif.append(a[i]) j += 1 print dif Thanks Baalu -- http://mail.python.org/mailman/listinfo/python-list
Re: difference between 2 arrays
Pierre (19.08.2009 10:48): Hello, I would like to know how to find the difference (set operation) between 2 arrays : a = array([1,2, 3,2,5,2]) b = array([1,2]) I want a - b = [3,5] What about set()? a = set([1,2, 3,2,5,2]) b = set([1,2]) a.difference(b) set([3, 5]) Matthias -- http://mail.python.org/mailman/listinfo/python-list
New message
Test -- http://mail.python.org/mailman/listinfo/python-list
Re: difference between 2 arrays
On Wed, Aug 19, 2009 at 4:48 AM, Pierrepierre.gaill...@gmail.com wrote: Hello, I would like to know how to find the difference (set operation) between 2 arrays : a = array([1,2, 3,2,5,2]) b = array([1,2]) I want a - b = [3,5] Well, the equivalence of setdiff in matlab... I thought a.difference(b) could work, but no : AttributeError: 'numpy.ndarray' object has no attribute 'difference' Thanks ! -- http://mail.python.org/mailman/listinfo/python-list import numpy a = numpy.array([1,2,3,2,5,2]) b = numpy.array([1,2]) c = list(set(a)-set(b)) # or c = numpy.array(list(set(a)-set(b))) if you want to continue w/ arrays print c -- http://mail.python.org/mailman/listinfo/python-list
Re: Read C++ enum in python
Neil Hodgson a écrit : For some headers I tried it didn't work until the .* was changed to a non-greedy .*? to avoid removing from the start of the first comment to the end of the last comment. file_data = ' '.join(re.split(r'\/\*.*?\*\/', file_data)) Thank you ! I adopt it ! Cheers. -- http://mail.python.org/mailman/listinfo/python-list
Re: difference between 2 arrays
baalu aanand wrote: On Aug 19, 1:48 pm, Pierre pierre.gaill...@gmail.com wrote: Hello, I would like to know how to find the difference (set operation) between 2 arrays : a = array([1,2, 3,2,5,2]) b = array([1,2]) I want a - b = [3,5] Well, the equivalence of setdiff in matlab... I thought a.difference(b) could work, but no : AttributeError: 'numpy.ndarray' object has no attribute 'difference' Thanks ! Hi, Here I have given my logic, check whether it helps for you a = [1,2, 3,2,5,2] b = [1,2] j = 0 dif = [] for i in range(len(a)) : if a[i] not in b: dif.append(a[i]) j += 1 print dif[k] EEEK, quadratic behavior!! Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: difference between 2 arrays
On 2009-08-19 01:48 AM, Pierre wrote: Hello, I would like to know how to find the difference (set operation) between 2 arrays : a = array([1,2, 3,2,5,2]) b = array([1,2]) I want a - b = [3,5] Well, the equivalence of setdiff in matlab... You will want to ask numpy questions on the numpy mailing list. http://www.scipy.org/Mailing_Lists Using set() is frequently a good option, but for large arrays, you will want to avoid the overhead of converting to and from sets and use numpy.setdiff1d(a, b): In [2]: a = array([1,2, 3,2,5,2]) In [3]: b = array([1,2]) In [4]: numpy.setdiff1d(a, b) Out[4]: array([3, 5]) -- Robert Kern I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth. -- Umberto Eco -- http://mail.python.org/mailman/listinfo/python-list
Re: How do I convert an iterator over bytes into a str?
On Aug 18, 6:52 pm, Jan Kaliszewski z...@chopin.edu.pl wrote: 19-08-2009 o 00:24:20 markscottwright markscottwri...@gmail.com wrote: What's the correct way to turn an iterator over bytes into a string? This works, but, ewww: In [8]: .join(iter(four score and seven years ago)) Out[8]: 'four score and seven years ago' But it is the correct way (and even recommended over s=s+t or s+=t, when applicable -- see: http://docs.python.org/library/stdtypes.html#sequence-types-str-unico...). Cheers, *j -- Jan Kaliszewski (zuo) z...@chopin.edu.pl Thanks Jan (and all other responders). I suppose I shouldn't be surprised - it's a known wart (http://wiki.python.org/moin/ PythonWarts), but it just looks so darn wrong. It is, as you point out, much faster than better looking alternatives, though - http://www.skymind.com/~ocrow/python_string/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Need cleanup advice for multiline string
In article mailman.18.1250595423.2854.python-l...@python.org, Jean-Michel Pichavant jeanmic...@sequans.com wrote: MRAB wrote: Carl Banks wrote: On Aug 17, 10:03 am, Jean-Michel Pichavant jeanmic...@sequans.com wrote: I'm no English native, but I already heard women/men referring to a group as guys, no matter that group gender configuration. It's even used for group composed exclusively of women. Moreover it looks like a *very* friendly form, so there is really nothing to worry about it. I like how being very friendly means calling people after a guy who tried to blow up the English Parliament. Guy Fawkes adopted the name Guido while fighting for the Spanish in the Low Countries: http://en.wikipedia.org/wiki/Guy_Fawkes I didn't get Carl's reference. The only thing I know about blowing the parliament is from the movie V for Vendetta (no comment please !). You should read the original comic book, it's much more interesting (and clearly mentions the Guy Fawkes connection). -- Aahz (a...@pythoncraft.com) * http://www.pythoncraft.com/ I saw `cout' being shifted Hello world times to the left and stopped right there. --Steve Gonedes -- http://mail.python.org/mailman/listinfo/python-list
Re: difference between 2 arrays
On 19 Aug, 01:48, Pierre pierre.gaill...@gmail.com wrote: Well, the equivalence of setdiff in matlab... That would be numpy.setdiff1d. -- http://mail.python.org/mailman/listinfo/python-list
Re: recording input from USB port and write to text file
On Aug 18, 7:33 pm, Allan af2...@gmail.com wrote:
Hi! I'm fairly new to Python. I understand the basics basics but I'm
been trying to write a simple python code that will let me read input
data (such as mouse movement) from my USB port and write it in a text
file and I am so lost. Can anyone help or direct me to some
resources? Thank you!
This isn't exactly what you were looking for, but maybe it will give
you some ideas:
from Tkinter import *
def printMotionEvents(event):
print mouse coords: %i x %i % (event.x, event.y)
t = Tk()
t.bind('Motion', printMotionEvents)
t.mainloop()
This script creates a little Tkinter window and then makes it so that
when you move the mouse over the window the mouse coordinates are
printed to stdout.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Database query execution times in Python?
In article mailman.108.1250247672.2903.python-l...@python.org, pwnedd keith.hugh...@gmail.com wrote: Look up EXPLAIN Thanks for the suggestion. I don't see any option to have EXPLAIN display the query time though? My suggestion was partly a gentle push toward a database forum to get more information -- this isn't really a Python question. Unless all you want to do is get the wall-clock time, in which case just use time.time(). -- Aahz (a...@pythoncraft.com) * http://www.pythoncraft.com/ Given that C++ has pointers and typecasts, it's really hard to have a serious conversation about type safety with a C++ programmer and keep a straight face. It's kind of like having a guy who juggles chainsaws wearing body armor arguing with a guy who juggles rubber chickens wearing a T-shirt about who's in more danger. --Roy Smith -- http://mail.python.org/mailman/listinfo/python-list
Re: Need cleanup advice for multiline string
On Aug 19, 12:05 am, Ben Finney ben+pyt...@benfinney.id.au wrote: Simon Forman sajmik...@gmail.com writes: On Tue, Aug 18, 2009 at 8:42 PM, Ben Finneyben+pyt...@benfinney.id.au wrote: We're all unified by our humanity. Bringing any god into the picture is surely counter to any goals of unity. Unity in humanity is, to my way of thinking, the same as Unity in God. Then you're playing Humpty-Dumpty games with words. You know very well that “God” has established meanings entirely different from “humanity”, and those meanings played a part in your choice of that word. I maintain that you can't consistently make a declaration in favour of human unity and unfounded religious assertions. I think Unity, like None, is a built-in singleton, so to speak. This is white noise. We are one family. Agreed. 3 I think we can peaceably leave it at that. Hear hear! (FWIW, I've always admired Humpty Dumpty's attitude to words. Have you ever read R.A. Wilson's Quantum Psychology?) Regards, ~Simon -- http://mail.python.org/mailman/listinfo/python-list
Re: httplib incredibly slow :-(
In article mailman.133.1250270175.2903.python-l...@python.org, Chris Withers ch...@simplistix.co.uk wrote: Aahz wrote: What do you need to know for a decent example? Simple download of a file from a url with some auth headers added would do me. Well, I've hacked up some sample code from my company's codebase: # !!! UNTESTED !!! c = pycurl.Curl() c.setopt(pycurl.URL, url) c.setopt(pycurl.USERPWD, %s:%s % (user, pwd)) c.setopt(pycurl.FOLLOWLOCATION, 1) c.setopt(pycurl.MAXREDIRS, 5) c.setopt(pycurl.CONNECTTIMEOUT, 30) f = StringIO() c.setopt(pycurl.WRITEDATA, f) c.perform() c.close() -- Aahz (a...@pythoncraft.com) * http://www.pythoncraft.com/ Given that C++ has pointers and typecasts, it's really hard to have a serious conversation about type safety with a C++ programmer and keep a straight face. It's kind of like having a guy who juggles chainsaws wearing body armor arguing with a guy who juggles rubber chickens wearing a T-shirt about who's in more danger. --Roy Smith -- http://mail.python.org/mailman/listinfo/python-list
Re: generate keyboard/mouse event under windows
On Aug 19, 2:07 pm, yaka gu.yakahug...@gmail.com wrote: Read this and see if it helps: http://kvance.livejournal.com/985732.html is there a way to generate a 'true' keyboard event? (works like user pressed a key on keyboard) not send the 'send keyboard event to application' ? -- http://mail.python.org/mailman/listinfo/python-list
Python and PHP encryption/decryption
I'm looking for a recommendation about encryption/decryption packages for Python. I'm working on a project that will require me to store some values in a database in encrypted format. I'll be storing them from a PHP script and retrieving them (decrypting them) using Python. I'm currently using PHP's mcrypt package to encrypt the values, and I'm using AES for encryption, so something AES-compatible would be ideal. However, the project is at the development stage so I can easily change how I'm encrypting things in PHP if there is a compelling reason on the Python side of things to do so. Many Thanks, Jean-Claude -- http://mail.python.org/mailman/listinfo/python-list
Re: Any way to adjust difflib algorithm?
In article fmqdncomnpg-jrjxnz2dnuvz_tti4...@posted.visi, Grant Edwards inva...@invalid wrote: On 2009-08-14, Grant Edwards inva...@invalid wrote: In my particular usage, no lines have ever been inserted/deleted, so perhaps I should be running diffs on individual lines instead? If I do that, I can't figure out how to generate HTML output. I ended up using the SequenceMatcher on individual pairs of lines and generating my own HTML based on the results of get_matching_blocks(). That produced the desired results. Good work! Note that IME most diff software shows changed lines as a delete-and-add. For example, diff -u -- Aahz (a...@pythoncraft.com) * http://www.pythoncraft.com/ Given that C++ has pointers and typecasts, it's really hard to have a serious conversation about type safety with a C++ programmer and keep a straight face. It's kind of like having a guy who juggles chainsaws wearing body armor arguing with a guy who juggles rubber chickens wearing a T-shirt about who's in more danger. --Roy Smith -- http://mail.python.org/mailman/listinfo/python-list
Re: NOOB: Developing using python on two different computers
On Aug 19, 6:50 am, Smeagol mczwhin...@yahoo.com wrote: Hi there, Occasionally I have to develop on two different computers, and I was wondering if there was a way to copy the python environment from one to the other? Access to the data is trivial (networked database) but various packages etc exist on one computer, and I want to ensure I have everything package-wise on the other. Both are windows machines (native windows box and a Macbook with VMWare running XP)... Is it as simple as copying the Python directory, or is there a script I can run that will tell me what packages are installed on the native windows box and then I can use easy_install to update the VM partition on the Macbook? Simple copy won't do it. Check out virtualenv (http://pypi.python.org/pypi/virtualenv). Reinstalling each env from scratch is usually the best bet. List your dependencies in your packages and all you have to do is easy_install your packages. -- http://mail.python.org/mailman/listinfo/python-list
Re: Any way to adjust difflib algorithm?
On 2009-08-19, Aahz a...@pythoncraft.com wrote: In article fmqdncomnpg-jrjxnz2dnuvz_tti4...@posted.visi, Grant Edwards inva...@invalid wrote: On 2009-08-14, Grant Edwards inva...@invalid wrote: In my particular usage, no lines have ever been inserted/deleted, so perhaps I should be running diffs on individual lines instead? If I do that, I can't figure out how to generate HTML output. I ended up using the SequenceMatcher on individual pairs of lines and generating my own HTML based on the results of get_matching_blocks(). That produced the desired results. Good work! Note that IME most diff software shows changed lines as a delete-and-add. For example, diff -u Right -- though difflib did show _some_ lines as changed rather than deleted/added, it wasn't obvious how it decided between the two. I suspect it used some sort of percentage-changed threshold. For this application both files had all the same lines (by definition), so what I was interested in was what parts of each line changed. -- Grant Edwards grante Yow! I just heard the at SEVENTIES were over!! And visi.comI was just getting in touch with my LEISURE SUIT!! -- http://mail.python.org/mailman/listinfo/python-list
Re: python doc available in emacs info format?
On Aug 17, 6:43 am, Xah Lee xah...@gmail.com wrote: btw, is there still [no] info format for python doc? i feel kinda sad [...] Part of this is due to [other peoples fault] Someone started a rst2info project (google it), maybe you want to help this guy out. Though, he might be a techgeeker, so watch out ! -ap -- http://mail.python.org/mailman/listinfo/python-list
Dictionary from a list
Hi all,
I need to create a dictionary out of a list.
Given the list [1, 2, 3, 4, 5, 6]
I need the dictionary: {1:2, 3:4, 5:6}
I'll appreciate your help
Thanks
iu2
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Re: Code formatting question: conditional expression
Diez wrote: No. I love them. But not if they are so large that they stretch over several lines (or to many columns). foo = bar if cond else baz is more than fine for me. But foo = I_need_to_do_something_really_complicated_here() if cond else baz isn't, because one doesn't grasp as easily in one look that we're talking a ternary operator here. But the right side of my brain (see Peter Keller's discussion in the recent importance of syntax thread) finds it quite easy to recognize this as a ternary op: foo = (I_need_to_do_something_really_complicated_here() if cond else baz) The whitespace below foo provides a visual hint, which is confirmed by the nearby appearance of if on the second line. De gustibus non est disputandum! (or not) Many thanks to all responders! -John -- http://mail.python.org/mailman/listinfo/python-list
Re: Dictionary from a list
iu2 schrieb:
Hi all,
I need to create a dictionary out of a list.
Given the list [1, 2, 3, 4, 5, 6]
I need the dictionary: {1:2, 3:4, 5:6}
dict(zip(l[::2], l[1::2]))
Diez
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Re: Python and PHP encryption/decryption
Jean-Claude Neveu schrieb: I'm looking for a recommendation about encryption/decryption packages for Python. I'm working on a project that will require me to store some values in a database in encrypted format. I'll be storing them from a PHP script and retrieving them (decrypting them) using Python. I'm currently using PHP's mcrypt package to encrypt the values, and I'm using AES for encryption, so something AES-compatible would be ideal. However, the project is at the development stage so I can easily change how I'm encrypting things in PHP if there is a compelling reason on the Python side of things to do so. With PyCrypto[1] you have a wide range of choices, amongst others AES. If that's the best algorithm, or even the best python-package to implement it, I don't know. [1] http://www.dlitz.net/software/pycrypto/ Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: recording input from USB port and write to text file
Simon Forman schrieb:
On Aug 18, 7:33 pm, Allan af2...@gmail.com wrote:
Hi! I'm fairly new to Python. I understand the basics basics but I'm
been trying to write a simple python code that will let me read input
data (such as mouse movement) from my USB port and write it in a text
file and I am so lost. Can anyone help or direct me to some
resources? Thank you!
This isn't exactly what you were looking for, but maybe it will give
you some ideas:
from Tkinter import *
def printMotionEvents(event):
print mouse coords: %i x %i % (event.x, event.y)
t = Tk()
t.bind('Motion', printMotionEvents)
t.mainloop()
This script creates a little Tkinter window and then makes it so that
when you move the mouse over the window the mouse coordinates are
printed to stdout.
If it has focus.
The overall problem is hard - see e.g. this:
http://www.wintellect.com/CS/blogs/jrobbins/archive/2008/08/30/so-you-want-to-set-a-windows-journal-recording-hook-on-vista-it-s-not-nearly-as-easy-as-you-think.aspx
Diez
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Re: Dictionary from a list
On Aug 19, 11:39 pm, Diez B. Roggisch de...@nospam.web.de wrote:
iu2 schrieb:
Hi all,
I need to create a dictionary out of a list.
Given the list [1, 2, 3, 4, 5, 6]
I need the dictionary: {1:2, 3:4, 5:6}
dict(zip(l[::2], l[1::2]))
Diez
Wow, this is cool!
thanks
iu2
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Re: recording input from USB port and write to text file
Diez B. Roggisch schrieb:
Simon Forman schrieb:
On Aug 18, 7:33 pm, Allan af2...@gmail.com wrote:
Hi! I'm fairly new to Python. I understand the basics basics but I'm
been trying to write a simple python code that will let me read input
data (such as mouse movement) from my USB port and write it in a text
file and I am so lost. Can anyone help or direct me to some
resources? Thank you!
This isn't exactly what you were looking for, but maybe it will give
you some ideas:
from Tkinter import *
def printMotionEvents(event):
print mouse coords: %i x %i % (event.x, event.y)
t = Tk()
t.bind('Motion', printMotionEvents)
t.mainloop()
This script creates a little Tkinter window and then makes it so that
when you move the mouse over the window the mouse coordinates are
printed to stdout.
If it has focus.
The overall problem is hard - see e.g. this:
http://www.wintellect.com/CS/blogs/jrobbins/archive/2008/08/30/so-you-want-to-set-a-windows-journal-recording-hook-on-vista-it-s-not-nearly-as-easy-as-you-think.aspx
But then, there is a solution :)
http://pypi.python.org/pypi/pyHook/1.4/
Diez
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What file is foo in package bar in ?
Hi - I think this is a pretty basic question but it's never worried me before. To improve my skills I'm reading the source code of a library written by someone else. I've come across a problem doing that. Commonly a function is called like this: thepackage.theclass.foo The problem is that 'theclass' is implemented in a file called nothingliketheclass.py so finding the implemention of foo is a bit boring. Now I can grep for foo and depending on how common the method name is that helps ... or not but I'm sure there must be a better way. Given an arbitary package is there some programmatic way to 'ask' what file the method/function is implemented in ? thanks R. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to create functors?
On Wed, 2009-08-19 at 15:56 +0200, Bruno Desthuilliers wrote:
Terry Reedy a écrit :
Robert Dailey wrote:
I'm using Python 2.6. And using the legacy syntax in the lambda does
not work either. I want to avoid using a def if possible. Thanks.
In Python, writing
name = lambda arg: expr
instead of
def name(arg): return expr
is all negative and no positive and should be avoided.
Except that def is a statement, and as such can't be used as a named
params when calling a function expecting a callback, ie:
vroom = some_dead('parrot', name=lambda arg: exp)
(notice the 'name = lambda arg: exp' ?-)
Which offers no added functionality over:
def name_func(arg):
return exp
vroom = some_dead('parrot', name=name_func)
except for confusion in debugging. :) (See other excessively long
threads on lambda for further discussion of the debugging headaches
caused by lambdas.
Ok, nitpicking. Me ---[]
g
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Re: What file is foo in package bar in ?
northof40 wrote: Given an arbitary package is there some programmatic way to 'ask' what file the method/function is implemented in ? Indeed, the inspect module contains several useful functions for the job, for example http://docs.python.org/library/inspect.html#inspect.getfile Christian -- http://mail.python.org/mailman/listinfo/python-list
#elements of seq A in seq B
What would be a time efficient way to count the number of occurrences of elements of sequence A in sequence B? (in this particular case, these sequences are strings, if that matters). -- http://mail.python.org/mailman/listinfo/python-list
Re: difference between 2 arrays
19-08-2009 o 10:56:20 Michel Claveau - MVPenleverLesX_XXmcX@xmclavxeaux.com wrote: (envoyé via news:\\news.wanadoo.fr\comp.lang.python) Hi! See the module sets No, see the builtin set type. Module sets is deprecated (removed in Py 3.x) -- Jan Kaliszewski (zuo) z...@chopin.edu.pl -- http://mail.python.org/mailman/listinfo/python-list
Re: What file is foo in package bar in ?
On Aug 20, 11:06 am, Christian Heimes li...@cheimes.de wrote: northof40 wrote: Given an arbitary package is there some programmatic way to 'ask' what file the method/function is implemented in ? Indeed, the inspect module contains several useful functions for the job, for examplehttp://docs.python.org/library/inspect.html#inspect.getfile Christian That's really great thanks - just what I was after. regards R. -- http://mail.python.org/mailman/listinfo/python-list
Re: Barcodes
On Wed, Aug 19, 2009 at 9:19 AM, Ronn Ross ronn.r...@gmail.com wrote: I was hoping that python would have a library to help me print my own bar codes? We will need labels in all sizes and most label printer just work with 1 or 2 sizes. I would like to just print a grid of different sizes on standard paper. Does python have a bar code printing library? On Mon, Aug 17, 2009 at 4:55 PM, Tim Chase python.l...@tim.thechases.comwrote: My company needs a small inventory management app. Does python have any libraries to help with reading and writing bar codes? I've written bar code apps and python really doesn't enter into that part of things. Printers generally have bar code printing capabilities so you just send the right escape sequences and you get the bar codes. To read them, bar code readers scan and translate before sending the values through typically a keyboard wedge or serial port. To add to what Emile mentions, most barcode readers present a keyboard-wedge interface, so that scanning a barcode merely appears as if you typed it at the keyboard (USB readers show up as a HID profile). Often they'll have configuration barcodes that you can scan to tweak the profile (such as pressing enter, tab or an arrow-key after sending the barcode; controlling beep tone volume, etc). For printing barcodes, you can use any number of solutions -- the most popular usually just involves installing a barcode font and then rendering text in that font to your desired output canvas. I believe there are some native rendering solutions as well, but I've not investigated since the font method was more than sufficient for my wants. -tkc -- http://mail.python.org/mailman/listinfo/python-list I found this library, but no documentation( https://cybernetics.hudora.biz/projects/wiki/huBarcode). Has anyone used this or know of a similar library with better documentation? -- http://mail.python.org/mailman/listinfo/python-list
Re: Dictionary from a list
19-08-2009 o 22:52:54 iu2 isra...@elbit.co.il wrote:
On Aug 19, 11:39 pm, Diez B. Roggisch de...@nospam.web.de wrote:
iu2 schrieb:
Hi all,
I need to create a dictionary out of a list.
Given the list [1, 2, 3, 4, 5, 6]
I need the dictionary: {1:2, 3:4, 5:6}
dict(zip(l[::2], l[1::2]))
Or (for long lists, when memory becomes expensive):
dict(li[i:i+2] for i in xrange(0, len(li), 2))
Or probably better:
from itertools import islice, izip
dict(izip(islice(li, 0, None, 2), islice(li, 1, None, 2)))
Cheers,
*j
--
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Re: #elements of seq A in seq B
20-08-2009 o 01:19:24 Neal Becker ndbeck...@gmail.com wrote:
What would be a time efficient way to count the number of occurrences of
elements of sequence A in sequence B? (in this particular case, these
sequences are strings, if that matters).
If you mean: to count occurences of each element of A (separately) in B...
Hm, maybe something like this:
# result as a dict {element of A: how many occurences in B, ...}
dict((element, B.count(element)) for element in A)
If you mean: to count non overlaping occurences of string A in B
-- simply:
B.count(A)
Regards,
*j
--
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Re: Dictionary from a list
20-08-2009 o 02:05:57 Jan Kaliszewski z...@chopin.edu.pl wrote: Or probably better: from itertools import islice, izip dict(izip(islice(li, 0, None, 2), islice(li, 1, None, 2))) Or similarly, perhaps more readable: iterator = iter(li) dict((iterator.next(), iterator.next()) for i in xrange(len(li)/2)) -- Jan Kaliszewski (zuo) z...@chopin.edu.pl -- http://mail.python.org/mailman/listinfo/python-list
Re: Identifying a class type - bad practice?
James Harris wrote: I don't know yet whether it will be easier to modify the tree or to create a new one for each phase. You can create a new tree using this style as well. Just have each method create and return a new node instead of modifying the existing one. -- Greg -- http://mail.python.org/mailman/listinfo/python-list
Re: python doc available in emacs info format?
A.Politz wrote: On Aug 17, 6:43 am, Xah Lee xah...@gmail.com wrote: btw, is there still [no] info format for python doc? i feel kinda sad [...] Part of this is due to [other peoples fault] Someone started a rst2info project (google it), maybe you want to help this guy out. Though, he might be a techgeeker, so watch out ! -ap Don't bother with this Xah Lee clown. He posts random crap because he thinks everyone wants to hear what he has to say about unrelated subject material and thinks he looks smart for doing it. Unfortunately, he usually lacks a clue about any topic he brings up (and he always starts a new thread like he's some authority). His goals are nothing more than to post arrogant, clueless rants thinking he's showing off. this is why he ALWAYS cross posts to the same groups (Emacs, Python,, Perl, etc.), even when the topic or content has nothing to do with those things. He thinks people in these groups automatically respect him, when most have killfiled him. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to create functors?
Robert Dailey rcdai...@gmail.com writes: I want to simply wrap a function up into an object so it can be called with no parameters. Nitpick: what you are asking for is called a closure. Functor means something completely different. As a few other people have explained, print in python 2.x is a statement rather than a function. You could use sys.stdout.write instead of print. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python and PHP encryption/decryption
Jean-Claude Neveu jcn-france1...@pobox.com writes: I'm working on a project that will require me to store some values in a database in encrypted format. I'll be storing them from a PHP script and retrieving them (decrypting them) using Python. I'm currently using PHP's mcrypt package to encrypt the values, and I'm using AES for encryption, so something AES-compatible would be ideal. There are several python libraries that support AES in the standard operating modes. If you are doing something sensible on the PHP side, you should be able to get Python to interoperate with it. Be careful that you are doing the right things algorithmically in terms of modes, IV's, etc. If you don't know what you're doing in this area, it's best to (at minimum) seek more specific advice. -- http://mail.python.org/mailman/listinfo/python-list
Re: #elements of seq A in seq B
On Aug 19, 8:17 pm, Jan Kaliszewski z...@chopin.edu.pl wrote:
20-08-2009 o 01:19:24 Neal Becker ndbeck...@gmail.com wrote:
What would be a time efficient way to count the number of occurrences of
elements of sequence A in sequence B? (in this particular case, these
sequences are strings, if that matters).
If you mean: to count occurences of each element of A (separately) in B...
Hm, maybe something like this:
# result as a dict {element of A: how many occurences in B, ...}
dict((element, B.count(element)) for element in A)
If you mean: to count non overlaping occurences of string A in B
-- simply:
B.count(A)
Regards,
*j
--
Jan Kaliszewski (zuo) z...@chopin.edu.pl
You don't want to use count() in a case like this because it iterates
through B len(A) times, i.e. this algorithm is O(A x B).
If all you want is the total you can do it like this:
def f(a, b):
a = set(a)
return sum(item in a for item in b)
A = 'some string'
B = 'another string'
print f(A, B) # prints 12
If you want to know the count for each element you can use this:
from collections import defaultdict
def g(a, b):
a = set(a)
d = defaultdict(int)
for item in b:
if item in a:
d[item] += 1
return d
print g(A, B)
# prints defaultdict(type 'int', {' ': 1, 'e': 1, 'g': 1, 'i': 1,
'o': 1, 'n': 2, 's': 1, 'r': 2, 't': 2})
HTH,
~Simon
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Re: How do I convert an iterator over bytes into a str?
markscottwright markscottwri...@gmail.com wrote: Thanks Jan (and all other responders). I suppose I shouldn't be surprised - it's a known wart (http://wiki.python.org/moin/ PythonWarts), but it just looks so darn wrong. Don't forget that it's exceptionally easy to create your own mechanism for doing this: def join(seq, sep): return sep.join(map(str, seq)) -- http://mail.python.org/mailman/listinfo/python-list
Re: #elements of seq A in seq B
On Wed, 19 Aug 2009, Neal Becker wrote: What would be a time efficient way to count the number of occurrences of elements of sequence A in sequence B? (in this particular case, these sequences are strings, if that matters). If A and B are rather lengthy, then maybe build a tree from elements of A and use it to count elements of B. I.e., tree nodes would be counters. Building trees in Python, however, I guess it is a little bit tricky. Of course it is possible. But maybe you would rather have this tree maintained in C. 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
IDLE is not as interactive as Maple
In the future, will Python provide programe enviroment like Maple does? In Maple, you can remove anything unneeded in the editor. And the code execution order are not necessary in one direction. You can run any command line on the screen by push Enter key. These functions gave a lot of flaxibility for users to start with programming something. -- http://mail.python.org/mailman/listinfo/python-list
Re: #elements of seq A in seq B
On Aug 20, 12:12 pm, Simon Forman sajmik...@gmail.com wrote: On Aug 19, 8:17 pm, Jan Kaliszewski z...@chopin.edu.pl wrote: If you mean: to count non overlaping occurences of string A in B -- simply: B.count(A) You don't want to use count() in a case like this because it iterates through B len(A) times, i.e. this algorithm is O(A x B). There's seems to be multiple confusion here. Jan was talking about counting non-overlapping occurrences of string A in [string] B. In that case B.count(A) is nowhere near O(A*B)... in fact in reasonable cases it is sub-linear i.e. O(B/A) See http://svn.python.org/view/python/trunk/Objects/stringlib/fastsearch.h?revision=68811view=markup And even a naive implementation of str.count() would not iterate through B len(A) times. and list.count() can't be used on its own to solve Neal's problem; its arg is a single element so it would have to be wrapped in a loop: sum (B.count(a) for a in A) which would of course be O(A*B) -- http://mail.python.org/mailman/listinfo/python-list
Re: Read C++ enum in python
Mark Tolonen metolone+gm...@gmail.com wrote in message
news:h6g9ig$vh...@ger.gmane.org...
[snip]
This is what 3rd party library pyparsing is great for:
begin code--
from pyparsing import *
# sample string with enums and other stuff
sample = '''
stuff before
enum hello {
Zero,
One,
Two,
Three,
Five=5,
Six,
Ten=10
}
in the middle
enum blah
{
alpha,
beta,
gamma = 10 ,
zeta = 50
}
at the end
'''
# syntax we don't want to see in the final parse tree
_lcurl = Suppress('{')
_rcurl = Suppress('}')
_equal = Suppress('=')
_comma = Suppress(',')
_enum = Suppress('enum')
identifier = Word(alphas,alphanums+'_')
integer = Word(nums)
enumValue = Group(identifier('name') + Optional(_equal +
integer('value')))
enumList = Group(enumValue + ZeroOrMore(_comma + enumValue))
enum = _enum + identifier('enum') + _lcurl + enumList('list') + _rcurl
# find instances of enums ignoring other syntax
for item,start,stop in enum.scanString(sample):
id = 0
for entry in item.list:
if entry.value != '':
id = int(entry.value)
print '%s_%s = %d' % (item.enum.upper(),entry.name.upper(),id)
id += 1
--end code
Output:
HELLO_ZERO = 0
HELLO_ONE = 1
HELLO_TWO = 2
HELLO_THREE = 3
HELLO_FIVE = 5
HELLO_SIX = 6
HELLO_TEN = 10
BLAH_ALPHA = 0
BLAH_BETA = 1
BLAH_GAMMA = 10
BLAH_ZETA = 50
Paul McGuire (pyparsing author) reminded me that:
enum.ignore(cppStyleComment)
before scanString will skip commented out sections as well.
-Mark
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Re: basic thread question
On Aug 18, 4:58 pm, birdsong david.birds...@gmail.com wrote: On Aug 18, 3:18 pm, Derek Martin c...@pizzashack.org wrote: On Tue, Aug 18, 2009 at 03:10:15PM -0500, Derek Martin wrote: I have some simple threaded code... If I run this with an arg of 1 (start one thread), it pegs one cpu, as I would expect. If I run it with an arg of 2 (start 2 threads), it uses both CPUs, but utilization of both is less than 50%. Can anyone explain why? Ah, searching while waiting for an answer (the e-mail gateway is a bit slow, it seems...) I discovered that the GIL is the culprate. Evidently this question comes up a lot. It would probably save a lot of time on the part of those who answer questions here, as well as those implementing solutions in Python, if whoever is maintaining the docs these days would put a blurb about this in the docs in big bold letters... Concurrency being perhaps the primary reason to use threading, essentially it means that Python is not useful for the sorts of problems that one would be inclined to solve they way my code works (or rather, was meant to). It would be very helpful to know that *before* one tried to implement a solution that way... especially for solutions significantly less trivial than mine. ;-) Thanks -- Derek D. Martinhttp://www.pizzashack.org/ GPG Key ID: 0x81CFE75D application_pgp-signature_part 1KViewDownload I would still watch that video which will explain a bit more about the GIL. Thank you for the video! It's good to know, but it raises lots of other questions in my mind. Lots of examples would have helped. ~Sean -- http://mail.python.org/mailman/listinfo/python-list
Re: Read C++ enum in python
pygccxml http://www.language-binding.net/pygccxml/pygccxml.html It uses gccxml to compile your source code into xml, and then makes all of your source code available to you via a high level and convenient query interface in python. On Tue, Aug 18, 2009 at 5:03 PM, Ludo olivier.anospamrnospamnnospamanospamenosp...@affaires.net wrote: Hello, I work in a very large project where we have C++ packages and pieces of python code. I've been googleing for days but what I find seems really too complicated for what I want to do. My business is, in python, to read enum definitions provided by the header file of an c++ package. Of course I could open the .h file, read the enum and transcode it by hand into a .py file but the package is regularly updated and thus is the enum. My question is then simple : do we have : - either a simple way in python to read the .h file, retrieve the c++ enum and provide an access to it in my python script - either a simple tool (in a long-term it would be automatically run when the c++ package is compiled) generating from the .h file a .py file containing the python definition of the enums ? Thank you for any suggestion. -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: How to create functors?
On Wed, 19 Aug 2009 18:42:32 -0700, Paul Rubin wrote: Robert Dailey rcdai...@gmail.com writes: I want to simply wrap a function up into an object so it can be called with no parameters. Nitpick: what you are asking for is called a closure. Functor means something completely different. I'm glad somebody else noticed this. I would have said something about it myself, except I wasn't entirely sure my understanding of functor is correct. As near as I can tell, a functor is just an object which is callable like a function without actually being implemented as a function, e.g.: class Functor: def __call__(self): return None f = Functor() result = f() -- Steven -- http://mail.python.org/mailman/listinfo/python-list
starting selenium rc server from python code
Hi, Is there anyway to start the selenium rc server within python code? Thank you Jo -- http://mail.python.org/mailman/listinfo/python-list
Re: How do I convert an iterator over bytes into a str?
On Wed, 19 Aug 2009 20:04:12 -0700, alex23 wrote: markscottwright markscottwri...@gmail.com wrote: Thanks Jan (and all other responders). I suppose I shouldn't be surprised - it's a known wart (http://wiki.python.org/moin/ PythonWarts), but it just looks so darn wrong. Don't forget that it's exceptionally easy to create your own mechanism for doing this: def join(seq, sep): return sep.join(map(str, seq)) Oh oh oh my brain hurts!!! Neither seq nor sep are real words, both are abbreviations, they differ by a single letter, and the two letters are mirror images of each other!!! This is a recipe for confusion when people get the order of sep and seq mixed up. Hopefully in real life code, you'd use a less easily confused function signature -- even just spelling out sequence and separator in full would reduce confusion to essentially zero. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Converting DD MM YYYY into YYYY-MM-DD?
Gilles Ganault nos...@nospam.com wrote in message news:rtqk859vm3rkdfor0gd2u2pq5sftl8m...@4ax.com... I find it odd that the regex library can't handle European characters It can. Read the documentation about the re.LOCALE flag. -Mark -- http://mail.python.org/mailman/listinfo/python-list
Re: starting selenium rc server from python code
On Wed, 19 Aug 2009 21:34:22 -0700, jo wrote: Hi, Is there anyway to start the selenium rc server within python code? How would you start the selenium rc server outside of Python code? -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: #elements of seq A in seq B
On Aug 19, 11:34 pm, John Machin sjmac...@lexicon.net wrote: On Aug 20, 12:12 pm, Simon Forman sajmik...@gmail.com wrote: On Aug 19, 8:17 pm, Jan Kaliszewski z...@chopin.edu.pl wrote: If you mean: to count non overlaping occurences of string A in B -- simply: B.count(A) You don't want to use count() in a case like this because it iterates through B len(A) times, i.e. this algorithm is O(A x B). There's seems to be multiple confusion here. Jan was talking about counting non-overlapping occurrences of string A in [string] B. In that case B.count(A) is nowhere near O(A*B)... in fact in reasonable cases it is sub-linear i.e. O(B/A) Seehttp://svn.python.org/view/python/trunk/Objects/stringlib/fastsearch And even a naive implementation of str.count() would not iterate through B len(A) times. and list.count() can't be used on its own to solve Neal's problem; its arg is a single element so it would have to be wrapped in a loop: sum (B.count(a) for a in A) which would of course be O(A*B) First, thanks for pointing out str.count(). I didn't know of it and I didn't notice that that was what was being used in Jan's code. (It's blindingly obvious-- now that you've pointed it out. :] ) Second, I was referring to this: dict((element, B.count(element)) for element in A) not B.count(A). Sorry for not interspersing my comment better. Regards, ~Simon -- http://mail.python.org/mailman/listinfo/python-list
Re: Setuptools - help!
On Aug 7, 3:04 pm, Peter Chant rempete...@petezilla.co.uk wrote: Robert Kern wrote: You need to put main.py into the pphoto package. $ mkdir pphoto/ $ mv main.py pphoto/ $ touch pphoto/__init__.py Thanks, it worked. Any ideas how to run the resulting scripts without installing or running as root? Pete --http://www.petezilla.co.uk If you are using Python 2.6+ you have your own site-packages directory, e.g. ~/.local/lib/python2.6/site-packages. So, if this package is only for your own use, you can use easy_install's --install- dir option to have setuptools install it there, and can also set -- script-dir to ~/bin, where your console script will go. This, and other options are discussed here: http://peak.telecommunity.com/DevCenter/EasyInstall#custom-installation-locations -- http://mail.python.org/mailman/listinfo/python-list
Re: Changing Python Opcodes
Sreejith K wrote: I know this is not the best way to do it. But I have to do it at least to make it *hard* to decompile the python bytecode. So I compiled Python from source changing some opcode values It probably wouldn't be all that hard for someone to figure this out. A possible avenue of attack would be to use your python to compile a known piece of code that exercises all the opcodes, and compare the result with that from a standard python. -- Greg -- http://mail.python.org/mailman/listinfo/python-list
Re: define class over 2 files
naveen wrote: Is it possible to split up a class definition over multiple files? Not exactly, but you can do variations of this: ... [subclass a class] Multiple inheritance can also be useful: # A_Part1.py class A_Part1: ... # A_Part2.py class A_Part2: ... # A.py from A_Part1 import A_Part1 from A_Part2 import A_Part2 class A(A_Part1, A_Part2): ... -- Greg -- http://mail.python.org/mailman/listinfo/python-list
Re: Read C++ enum in python
On Aug 18, 6:03 pm, Ludo
olivier.anospamrnospamnnospamanospamenosp...@affaires.net wrote:
Hello,
I work in a very large project where we have C++ packages and pieces of
python code.
I've been googleing for days but what I find seems really too
complicated for what I want to do.
My business is, in python, to read enum definitions provided by the
header file of an c++ package.
Of course I could open the .h file, read the enum and transcode it by
hand into a .py file but the package is regularly updated and thus is
the enum.
My question is then simple : do we have :
- either a simple way in python to read the .h file, retrieve the c++
enum and provide an access to it in my python script
Try something like this:
file_data = open(filename).read()
# Remove comments and preprocessor directives
file_data = ' '.join(line.split('//')[0].split('#')[0] for line in
file_data.splitlines())
file_data = ' '.join(re.split(r'\/\*.*\*\/', file_data))
# Look for enums: In the first { } block after the keyword enum
enums = [text.split('{')[1].split('}')[0] for text in re.split(r'\benum
\b', file_data)[1:]]
for enum in enums:
last_value = -1
for enum_name in enum.split(','):
if '=' in enum_name:
enum_name, enum_value = enum_name.split('=')
enum_value = int(enum_value, 0)
else:
enum_value = last_value + 1
last_value = enum_value
enum_name = enum_name.strip()
print '%s = %d' % (enum_name, enum_value)
print
--
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Re: Diversity in Python
On Tuesday 18 August 2009 12:38:36 Ben Finney wrote: Hendrik van Rooyen hend...@microcorp.co.za writes: On Tuesday 18 August 2009 06:45:39 Aahz wrote: Mainly an opportunity to flog the new diversity list. Here my English fails me - flog as in whip, or flog as in sell? Yes :-) Thank you that clears it up. :-) - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: recording input from USB port and write to text file
Allan schrieb: Hi! I'm fairly new to Python. I understand the basics basics but I'm been trying to write a simple python code that will let me read input data (such as mouse movement) from my USB port and write it in a text file and I am so lost. Can anyone help or direct me to some resources? Thank you! This isn't as easy as you think. And dependend on your operating-system. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: Parallelization in Python 2.6
Dennis Lee Bieber wrote: On Tue, 18 Aug 2009 13:45:38 -0700 (PDT), Robert Dailey wrote: Really, all I'm trying to do is the most trivial type of parallelization. Take two functions, execute them in parallel. This type of parallelization is called embarrassingly parallel, and is the simplest form. There are no dependencies between the two functions. They do requires read-only access to shared data, though. And if they are being spawned as sub-processes this could cause problems, unless the multiprocess module creates pipelines or other means to handle this situation. It wouldn't be much worth if it didn't, as the subprocess module handles everything else nicely. See the Queue classes. If they are number crunchers (CPU-bound) and don't make use of binary extension libraries that release the GIL (for the most common Python implementation), they'll run faster being called in sequence since you won't have the overhead of task switching. ... unless, obviously, the hardware is somewhat up to date (which is not that uncommon for number crunching environments) and can execute more than one thing at once. Stefan -- http://mail.python.org/mailman/listinfo/python-list
Re: Inheriting dictionary
On Tuesday 18 August 2009 21:44:55 Pavel Panchekha wrote:
I want a dictionary that will transparently inherit from a parent
dictionary. So, for example:
a = InheritDict({1: one, 2: two, 4: four})
b = InheritDict({3: three, 4: foobar}, inherit_from=a)
a[1] # one
a[4] # four
b[1] # one
b[3] # three
b[4] # foobar
I've written something like this in Python already, but I'm wondering
if something like this already exists, preferably written in C, for
speed.
Its not inheritance, but have you looked at the update method?
-Hendrik
--
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Re: Parallelization in Python 2.6
On Tuesday 18 August 2009 22:45:38 Robert Dailey wrote: Really, all I'm trying to do is the most trivial type of parallelization. Take two functions, execute them in parallel. This type of parallelization is called embarrassingly parallel, and is the simplest form. There are no dependencies between the two functions. They do requires read-only access to shared data, though. And if they are being spawned as sub-processes this could cause problems, unless the multiprocess module creates pipelines or other means to handle this situation. Just use thread then and thread.start_new_thread. It just works. - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: Read C++ enum in python
MRAB pyt...@mrabarnett.plus.com wrote in message
news:4a8b3e2d.7040...@mrabarnett.plus.com...
Ludo wrote:
Hello,
I work in a very large project where we have C++ packages and pieces of
python code.
I've been googleing for days but what I find seems really too complicated
for what I want to do.
My business is, in python, to read enum definitions provided by the
header file of an c++ package.
Of course I could open the .h file, read the enum and transcode it by
hand into a .py file but the package is regularly updated and thus is the
enum.
My question is then simple : do we have :
- either a simple way in python to read the .h file, retrieve the c++
enum and provide an access to it in my python script
- either a simple tool (in a long-term it would be automatically run
when the c++ package is compiled) generating from the .h file a .py file
containing the python definition of the enums ?
Thank you for any suggestion.
Speaking personally, I'd parse the .h file using a regular expression
(re module) and generate a .py file. Compilers typically have a way of
letting you run external scripts (eg batch files in Windows or, in this
case, a Python script) when an application is compiled.
This is what 3rd party library pyparsing is great for:
begin code--
from pyparsing import *
# sample string with enums and other stuff
sample = '''
stuff before
enum hello {
Zero,
One,
Two,
Three,
Five=5,
Six,
Ten=10
}
in the middle
enum blah
{
alpha,
beta,
gamma = 10 ,
zeta = 50
}
at the end
'''
# syntax we don't want to see in the final parse tree
_lcurl = Suppress('{')
_rcurl = Suppress('}')
_equal = Suppress('=')
_comma = Suppress(',')
_enum = Suppress('enum')
identifier = Word(alphas,alphanums+'_')
integer = Word(nums)
enumValue = Group(identifier('name') + Optional(_equal + integer('value')))
enumList = Group(enumValue + ZeroOrMore(_comma + enumValue))
enum = _enum + identifier('enum') + _lcurl + enumList('list') + _rcurl
# find instances of enums ignoring other syntax
for item,start,stop in enum.scanString(sample):
id = 0
for entry in item.list:
if entry.value != '':
id = int(entry.value)
print '%s_%s = %d' % (item.enum.upper(),entry.name.upper(),id)
id += 1
--end code
Output:
HELLO_ZERO = 0
HELLO_ONE = 1
HELLO_TWO = 2
HELLO_THREE = 3
HELLO_FIVE = 5
HELLO_SIX = 6
HELLO_TEN = 10
BLAH_ALPHA = 0
BLAH_BETA = 1
BLAH_GAMMA = 10
BLAH_ZETA = 50
-Mark
--
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socket bug or not?
Hello everyone,
I found what was not working in my code (see Twisted mailing list topics
self.socket.accept() in doRead() in tcp.py has (11, 'Resource
temporarily unavailable') error, Twisted, PushProducer, Words big
msgs, any limit? and Python mailing list topic socket.send : (11,
'Resource temporarily unavailable')). I was just wondering if this was
a bug or not, so here it is, I wrote aserver using twisted words'
xmlstream class. When a client connects, it sends stream and the
server also sends it, so a bi-directional xmlstream communication is
established. This works fine, I at some point wrote a webservice to send
msgs to my system, not using any twisted code, that sends a message to
my server in this format : streammessage./message/stream.
This worked fine as long as the messages were small, but if it send
larger msgs (I tried +128k msgs) the server only received part of the
msg and then the parser died because of this, so my msg appeared to be
dropped. I discovered that it was because my webservice did not read the
stream element sent by the server when it connected (since I was not
interested in having a bidirectional xml stream communication with it),
when I added the code to read it, everything worked as expected. I
tested the webservice to without the server to see if it had a problem,
using netcat, and it does, so I wonder if there is a bug in the socket
code or not. Here is the test code :
## Listing 1 Start ##
import socket, time
STREAM_START = stream
STREAM_END = /stream
def sendTestMessage(host, port):
msg = message + ('a' * 175177) + /message
burstSize = 4096
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((host, port))
sock.send(STREAM_START)
time.sleep(5)
while msg:
sent = sock.send(msg[:burstSize])
print Sending %d bytes... % sent
if sent == 0:
raise RuntimeError, socket connection broken
msg = msg[burstSize:]
sock.send(STREAM_END)
sock.close()
## Listing 1 End ##
To test it:
1) open a python interpretor, copy-past the code above
2) open another terminal and run netcat using the following command :
nc -v -l -p
3) call the above function using : sendTestMessage(localhost, ),
it will wait 5 seconds after having sent the stream, for the first
test, just wait.
The message will be completely send and received by the netcat server,
now let's test the case I have, where the server sends a stream, to do
that, repeat the above steps (you have to re-run netcat as it exits when
the client disconnects), except in step 3 instead of just waiting, type
stream and press enter in the netcat terminal after having received
the stream element from the sending code. This time you will see that
the message is incomplete.
If you send a smaller message, like by replacing the following line :
msg = message + ('a' * 175177) + /message
with :
msg = message + ('a' * (175177/4)) + /message
it works in both cases.
Now test the fixed code :
## Listing 2 Start ##
import socket
STREAM_START = stream
STREAM_END = /stream
def sendTestMessage(host, port):
msg = message + ('a' * 175177) + /message
burstSize = 4096
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((host, port))
sock.send(STREAM_START)
sock.recv(len(STREAM_START)+1)
while msg:
sent = sock.send(msg[:burstSize])
print Sending %d bytes... % sent
if sent == 0:
raise RuntimeError, socket connection broken
msg = msg[burstSize:]
sock.send(STREAM_END)
sock.close()
## Listing 2 End ##
This time the code reads for the stream element after sending the
stream element so it works, just try the steps described above, the
ones where you have to type stream and press enter in the netcat
terminal and this time it works.
Is this a bug in the sockets code, or is this normal? If it's normal I
think it should be mentioned somewhere. Oh, by the way, I use linux and
this code was tested only on linux, I don't know if the problem also
occurs on other platforms.
Gabriel
--
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expandtabs acts unexpectedly
Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41) [GCC 4.3.3] on linux2 Type help, copyright, credits or license for more information. ' test\ttest'.expandtabs(4) ' test test' 'test \ttest'.expandtabs(4) 'testtest' 1st example: expect returning 4 spaces between 'test', 3 spaces returned 2nd example: expect returning 5 spaces between 'test', 4 spaces returned Is it a bug or something, please advice. -- http://mail.python.org/mailman/listinfo/python-list
Re: expandtabs acts unexpectedly
On Wed, Aug 19, 2009 at 5:57 PM, digisat...@gmail.com digisat...@gmail.comwrote: Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41) [GCC 4.3.3] on linux2 Type help, copyright, credits or license for more information. ' test\ttest'.expandtabs(4) ' test test' 'test \ttest'.expandtabs(4) 'testtest' Is it a bug or something, please advice. -- It is completely working as intended. What were you expecting instead? Regards, -Xav -- http://mail.python.org/mailman/listinfo/python-list
Re: Parallelization in Python 2.6
Hendrik van Rooyen hend...@microcorp.co.za writes: Just use thread then and thread.start_new_thread. It just works. The GIL doesn't apply to threads made like that?! -- http://mail.python.org/mailman/listinfo/python-list
Re: Read C++ enum in python
AggieDan04:
file_data = open(filename).read()
# Remove comments and preprocessor directives
file_data = ' '.join(line.split('//')[0].split('#')[0] for line in
file_data.splitlines())
file_data = ' '.join(re.split(r'\/\*.*\*\/', file_data))
For some headers I tried it didn't work until the .* was changed to a
non-greedy .*? to avoid removing from the start of the first comment to
the end of the last comment.
file_data = ' '.join(re.split(r'\/\*.*?\*\/', file_data))
Neil
--
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Re: expandtabs acts unexpectedly
digisat...@gmail.com digisat...@gmail.com writes: Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41) [GCC 4.3.3] on linux2 Type help, copyright, credits or license for more information. ' test\ttest'.expandtabs(4) ' test test' 'test \ttest'.expandtabs(4) 'testtest' 1st example: expect returning 4 spaces between 'test', 3 spaces returned 2nd example: expect returning 5 spaces between 'test', 4 spaces returned Is it a bug or something, please advice. Consider where the 4-space tabstops are relative to those strings: test test testtest ^ ^ ^ So no, it's not a bug. If you just want to replace the tab characters by spaces, use: test\ttest.replace(\t, ) ' testtest' test \ttest.replace(\t, ) 'test test' HTH, Peter -- Peter Brett pe...@peter-b.co.uk Remote Sensing Research Group Surrey Space Centre -- http://mail.python.org/mailman/listinfo/python-list
reading a text file
hi clp what's the difference between: while True: input_line = sys.stdin.readline() if input_line: sys.stdout.write(input_line.upper()) else: break and: while True: try: sys.stdout.write(sys.stdin.next().upper()) except StopIteration: break ??? -- http://mail.python.org/mailman/listinfo/python-list
Re: reading a text file
superpollo u...@example.net writes: while True: try: sys.stdout.write(sys.stdin.next().upper()) except StopIteration: break Maybe there is some subtle difference, but it looks like you really mean for line in sys.stdin: sys.stdout.write(line.upper()) -- http://mail.python.org/mailman/listinfo/python-list
difference between 2 arrays
Hello, I would like to know how to find the difference (set operation) between 2 arrays : a = array([1,2, 3,2,5,2]) b = array([1,2]) I want a - b = [3,5] Well, the equivalence of setdiff in matlab... I thought a.difference(b) could work, but no : AttributeError: 'numpy.ndarray' object has no attribute 'difference' Thanks ! -- http://mail.python.org/mailman/listinfo/python-list
Re: Identifying a class type - bad practice?
On 18 Aug, 21:50, Chris Rebert c...@rebertia.com wrote: On Tue, Aug 18, 2009 at 10:09 AM, James Harrisjames.harri...@googlemail.com wrote: I am writing some code to form a tree of nodes of different types. The idea is to define one class per node type such as class node_type_1(node): specific properties by name including other node types class node_type_2(node): specific properties by name including other node types etc (Class node would hold any common properties). When walking the tree I need to know what type of node I'm dealing with so polymorphism isn't generally useful. The action to be taken depends on the node type. I'm sure it relates to the exact type of tree you're walking and the calculation you're doing on it, but what is the reason why your code, which in the abstract sounds like it will vaguely resemble this: def walk_tree(tree): if isinstance(tree, node_type_1): #code walk_tree(subtree) elif isinstance(tree, node_type_2): #code walk_tree(subtree) #etc... can't be written instead as: class node_type_1: def walk_tree(self): #code self.subtree.walk() class node_type_2: def walk_tree(self): #code self.subtree.walk() #etc Interesting idea. This may be a better and a more OO solution than what I had in mind. I'm not sure if I can use this but I'll see how it fits in as the work progresses. The tree is for a compiler. Initially the tree is for parsing of source code. Then it will need to be processed and changed as further compiler phases are written. I don't know yet whether it will be easier to modify the tree or to create a new one for each phase. So I guess whether I use the idea depends on the commonality of operations. James -- http://mail.python.org/mailman/listinfo/python-list
Re: difference between 2 arrays
Pierre wrote: Hello, I would like to know how to find the difference (set operation) between 2 arrays : a = array([1,2, 3,2,5,2]) b = array([1,2]) I want a - b = [3,5] Well, the equivalence of setdiff in matlab... I thought a.difference(b) could work, but no : AttributeError: 'numpy.ndarray' object has no attribute 'difference' Not sure if this works with numpy-arrays, but set(a) - set(b) might just work if the arrays are iterable. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: difference between 2 arrays
(envoyé via news:\\news.wanadoo.fr\comp.lang.python) Hi! See the module sets @-salutations -- Michel Claveau -- http://mail.python.org/mailman/listinfo/python-list
Re: reading a text file
superpollo wrote: hi clp what's the difference between: while True: input_line = sys.stdin.readline() if input_line: sys.stdout.write(input_line.upper()) else: break and: while True: try: sys.stdout.write(sys.stdin.next().upper()) except StopIteration: break You should write the latter as for line in sys.stdin: sys.stdout.write(line.upper()) or sys.stdout.writelines(line.upper() for line in sys.stdin) You seem to know already that next() and readline() use different ways to signal I'm done with the file. Also, after the first StopIteration subsequent next() calls are guaranteed to raise a StopIteration. But the main difference is that file.next() uses an internal buffer, file.readline() doesn't. That means you would lose data if you tried to replace the readline() call below with next() first_line = f.readline() read_of_the_file = f.read() In newer Python versions you will get a ValueError when mixing next() and read()/readline() but in older Pythons (before 2.5 I think) you are in for a surprise. As for line in file: ... is both the fastest and most readable approach if you want to access a file one line at a time I recommend that you use it unless there is a specific reason not to. Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: Scope and classes
Chris Rebert a écrit : (snip) To access class-level variables from within instance methods of the class, you have 2 options: A. Use the class name, i.e. Abc.message B. Reference the class indirectly, i.e. self.__class__.message Or even simpler - *if* there's no synonym instance attribute: = self.message Attribute lookup will try to resolve the attribute name on the class (and it's parent classes) if it's not found on the instance. -- http://mail.python.org/mailman/listinfo/python-list
How to create ones own lib
Hi, I would like to create my own lib hotte.py which I can import like import string,hotte . How do I do that? I'm working on MacOS 10.5.6 . Thanks in advance -- http://mail.python.org/mailman/listinfo/python-list
Re: How to create ones own lib
On Wed, Aug 19, 2009 at 7:00 PM, Horst Jäger h.jae...@medienkonzepte.dewrote: Hi, I would like to create my own lib hotte.py which I can import like import string,hotte . How do I do that? 1) Have the hotte.py in the same directory of any of your other Python code that imports it, or 2) Put the hotte.py file in the Python import directive, whose location I do not know in Mac.. someone else will know, I'm sure =] All in all, I'm pretty sure you don't have to compile it or anything, but it can be an option. Cheers, Xav -- http://mail.python.org/mailman/listinfo/python-list
Re: How to create ones own lib
On 19 Ago, 11:00, Horst Jäger h.jae...@medienkonzepte.de wrote: Hi, I would like to create my own lib hotte.py which I can import like import string,hotte . How do I do that? I'm working on MacOS 10.5.6 . Thanks in advance Just create the file 'hotte.py' and place it somewhere python can find it, that is: - in the same directory of the code using it (which is most probablyt what you want to do ) - in a directory listed in sys.path variable (which you can extend using sys.path.append(full_path_of_my_library_directory) before doing import hotte There are other options, but these should cover your needs. Ciao - FB -- http://mail.python.org/mailman/listinfo/python-list
Re: Scope and classes
David a écrit : (snip) Out of 'Abc.message' and 'self.message', which is the favoured convention? It would be very easy to accidentally override 'self.messages' with an instance attribute! Only use 'Abc.message' if you want to make sure you get the Abc class 'message' attribute - that is, if you want to skip possible overrides in subclasses. As far as I'm concerned, I'd tend to consider this bad style unless it's a very very specific implementation point of an abstract class (in which case it would probably be named '__message' to prevent accidental override) - but YMMV of course. Use 'self.__class__.message' (or 'type(self).message') if you want to make sure you get the class 'message' attribute - that is, if you want to honor possible overrides in subclasses, but not per-instance override. But then - at least in your example code - I'd use a classmethod: class Abc: message = 'Hello World' @classmethod def print_message(cls): print cls.message Now the most common idiom - that is, outside classmethods - is to just use 'self.message'. Someone (even you) might have a very valid reason to override the 'message' attribute on a per-instance basis. FWIW, if you start to worry about possible accidental overrides here, then Python might not be the right language for you - nothing prevents accidental overrides of method and even the class (the '__class__' attribute) itself - yes, they are all attributes, and you can dynamically override them !-) -- http://mail.python.org/mailman/listinfo/python-list
Re: Read C++ enum in python
Mark Tolonen metolone+gm...@gmail.com wrote in message
news:mailman.89.1250666942.2854.python-l...@python.org...
MRAB pyt...@mrabarnett.plus.com wrote in message
news:4a8b3e2d.7040...@mrabarnett.plus.com...
Ludo wrote:
Hello,
I work in a very large project where we have C++ packages and pieces of
python code.
I've been googleing for days but what I find seems really too
complicated for what I want to do.
My business is, in python, to read enum definitions provided by the
header file of an c++ package.
Of course I could open the .h file, read the enum and transcode it by
hand into a .py file but the package is regularly updated and thus is
the enum.
My question is then simple : do we have :
- either a simple way in python to read the .h file, retrieve the
c++ enum and provide an access to it in my python script
- either a simple tool (in a long-term it would be automatically run
when the c++ package is compiled) generating from the .h file a .py file
containing the python definition of the enums ?
Thank you for any suggestion.
Speaking personally, I'd parse the .h file using a regular expression
(re module) and generate a .py file. Compilers typically have a way of
letting you run external scripts (eg batch files in Windows or, in this
case, a Python script) when an application is compiled.
This is what 3rd party library pyparsing is great for:
begin code--
from pyparsing import *
# sample string with enums and other stuff
sample = '''
stuff before
enum hello {
Zero,
One,
Two,
Three,
Five=5,
Six,
Ten=10
}
in the middle
enum blah
{
alpha,
beta,
gamma = 10 ,
zeta = 50
}
at the end
'''
# syntax we don't want to see in the final parse tree
_lcurl = Suppress('{')
_rcurl = Suppress('}')
_equal = Suppress('=')
_comma = Suppress(',')
_enum = Suppress('enum')
identifier = Word(alphas,alphanums+'_')
integer = Word(nums)
enumValue = Group(identifier('name') + Optional(_equal +
integer('value')))
enumList = Group(enumValue + ZeroOrMore(_comma + enumValue))
enum = _enum + identifier('enum') + _lcurl + enumList('list') + _rcurl
# find instances of enums ignoring other syntax
for item,start,stop in enum.scanString(sample):
id = 0
for entry in item.list:
if entry.value != '':
id = int(entry.value)
print '%s_%s = %d' % (item.enum.upper(),entry.name.upper(),id)
id += 1
--end code
Output:
HELLO_ZERO = 0
HELLO_ONE = 1
HELLO_TWO = 2
HELLO_THREE = 3
HELLO_FIVE = 5
HELLO_SIX = 6
HELLO_TEN = 10
BLAH_ALPHA = 0
BLAH_BETA = 1
BLAH_GAMMA = 10
BLAH_ZETA = 50
-Mark
Python and pythoneers are amazing!
--
http://mail.python.org/mailman/listinfo/python-list
Re: Need cleanup advice for multiline string
Grant Edwards wrote: On 2009-08-18, Simon Forman sajmik...@gmail.com wrote: Sexism, racism, homophobia, religious intolerance, etc., all stem from a fundamental forgetfulness of our Unity in God (as I would put it) and this is perhaps the single greatest cause of human misery. You mean the single greatest cause of human misery isn't Microsoft Windows? No, emacs is responsible ! Hail to Vi ! JM -- http://mail.python.org/mailman/listinfo/python-list
