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

Python2.0 beta 2 on MacOSX/Darwin
by Steven D. Majewski Sept. 29, 2000

Sept. 29, 2000

If you want to do Mac OSX development without the developers CD, "Darwin Tools on Mac OSX" at <http://www.darwinfo.org/> has a link to the article: <http://www.macaddict.com/content/news/2000/09/13/18709> containing instructions and a shell script to merege the Darwin development tools from the Darwin 1.0 distribution into MacOSX. Python 2.0 beta 2 <http://www.beopen.com/products/python2.0/BeOpen-Python-2.0b2.tar.gz> builds on OSX or Darwin configure options: --with-dyld # otherwise you get errors trying to include rld.h # I think thats for the old style next libraries. --with-suffix=.app # or ".exe" or whatever # this solves the case insensitivity problem on HFS+ # The only clash is when make tries to move the # executable in "Python/python" to the parent dir. # this renames the executable with a suffix. --host=Darwin # Not sure about this, but it may have stopped some # errors with trying to build Next platform specific code. ( maybe that's not doing what I thought as sys.platform still= 'next') Modules: bsdbm gets automagically added by configure (See notes in Modules/Setup) threads are also automatically configured by default. crypt can be added in Modules/Setup -- no added library switches needed. pyexpat: expat will build, but building a library using 'ar' , as in the note in Modules/Setup will give link errors. -- Use libtool instead: "libtool -static -o libexpat.a xmltol/*.o xmlparse/*.o" (CoreFoundation, which is one of the OSX Frameworks also included in Darwin, also has functions to convert to and from XML property lists, but I don't believe that it exposes a full XML parser api. ) Limitations: tests seem to run ok except that I get a : test_re Running tests on re.search and re.match Running tests on re.sub Running tests on symbolic references Running tests on re.subn Running tests on re.split Running tests on re.findall Running tests on re.match Running tests on re.escape Pickling a RegexObject instance Test engine limitations Segmentation fault using configure --with-next-framework along with --with-dyld didn't work. (Don't remember the error -- I'll try again) Just uncommenting the "*shared*" in Modules/Setup gives this build error: cc -bundle -prebind arraymodule.o -o arraymodule.so /usr/bin/ld: warning -prebind has no effect with -bundle /usr/bin/ld: Undefined symbols: _PyArg_Parse _PyArg_ParseTuple _PyDict_SetItemString _PyErr_BadArgument _PyErr_Clear _PyErr_Format _PyErr_NoMemory _PyErr_Occurred To Do: Need to get dynamic loading of shared libraries working. ( dynamic loading + threading + pyexpat => Zope ought to port! ) Then need to work on Darwin|MacOSX specific libraries. Tkinter, pyGtk and/or wxWindows under XFREE86 would be nice. gtk has been ported to Darwin/XFREE86 Tcl has been ported but not, as far as I know Tk. Is the Mac port of Tk carbonized ? If it were, it would allow Tk on both Darwin under X11 and MacOSX under Carbon. ( We really want Quartz, but it would be nice to have something that runs anywhere, and TK is probably the closest thing. It was kind of strange to type "open PythonInterpreter" cd-ed to the OS9 MacPython folder and see OS9 boot up and run Python. I get an error message that my preferences are corrupt -- I wonder if this is from the OSX install on top of OS9 moving the system folder. But otherwise, things seem to work -- I only tried EasyDialogs.test() and started a Tkinter window -- not a very complete test. ) ---| Steven D. Majewski (804-982-0831) <sdm7g(a)Virginia.EDU> |--- ---| Department of Molecular Physiology and Biological Physics |--- ---| University of Virginia Health Sciences Center |--- ---| P.O. Box 10011 Charlottesville, VA 22906-0011 |--- "All operating systems want to be unix, All programming languages want to be lisp."

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Python on Palm ?
by Florian W. Sept. 29, 2000

Sept. 29, 2000

Hi python-people ! Has someone already ported python to palm-os ? The palm is a nice system for little GUI-Applications. Mfg Florian

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Re: match certain word
by aahz＠panix.com Sept. 29, 2000

Sept. 29, 2000

In article <mailman.970139383.1640.python-list(a)python.org>, irwan <ryzam(a)tm.net.my> wrote: > >how can i use re module to match a word > >Ex >a='<html><title>Test: Data</title></html>' > >so i would like only "Test: Data" or any word in with that range return >back I'm not sure what you mean by "that range". It's also not clear what you want to happen when you do or don't get a match. Do you want to retrieve the matching word for later processing? Because you've got HTML tags, what I recommend is that you look at using the htmllib module to do the work (instead of an RE), particularly if you are going to do lots of HTML processing. BTW, please change your newsreader to post in ASCII (sometimes called "plain text"). It makes your posts a lot easier to read for many people; some people will just ignore posts with HTML. -- --- Aahz (Copyright 2000 by aahz(a)pobox.com) Androgynous poly kinky vanilla queer het <*> http://www.rahul.net/aahz/ Hugs and backrubs -- I break Rule 6 "Perhaps God rewards martyrs, but life seldom does..." --Ulrika O'Brien

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Re: filtering out "bad" regular expressions from user input
by Alex Sept. 29, 2000

Sept. 29, 2000

> We allow users to input regular expressions to our search engine. > Problem is, when (and they inevitably do, so it's not "if") they input > a bad regular expression, it sends the backend search engine into a > tizzy (backend is MySQL, frontend is Python). For example, "^" will > cause it to match everything, as will "^.*$", "" and ".*". Can you test the regexp against a few randomly generated strings? If it matches against any of them, it's going to be pretty promiscuous. I guess you could also perform the tests in a thread, and kill the thread if it takes too long. That would go some way to locating really demanding regexps. Alex. -- Speak softly but carry a big carrot.

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Re: Fractal Dimension Computation in Python Code
by Mike Brenner Sept. 29, 2000

Sept. 29, 2000

Mike Brenner > According to the inventor of fractals (Hausdorff in the year 1899), you can place the set of 2D points next to a wall and shine light through them, and the fractal dimension is the percentage of shadow on the wall. Alex > Can you give a reference? This suprises me, because it seems to me that since a Koch-curve has zero two-dimensional area, it will also cast a zero-area shadow. On the other hand, its Hausdorff dimension is greater than 1, if I recall correctly. Is Hausdorff dimension the same as fractal dimension? Yes, the shadow explanation is approximate. A reference is Federer: Geometric Measure Theory. Yes, fractal dimension is a contraction of fractional dimension and is the same as the Hausdorff dimension. The exact definition of the shadow looks like filling the figure with circles, then the remainder with smaller circles, and ever smaller circles, and then add up the areas of all of the circles. Later, other mathematicians found out that a simpler definition could be made with the limit of circles of a single radius approaching zero instead of all different size circles. At any given radius of the smaller circles, there is a certain percentage (THIS IS THE SHADOW) of the figure inside of those circles, because of the self-similarity, there is a fractal dimension greater than 1. The Koch curve has a Hausdorff Dimension of 1.26, a Fractional Dimension of 1.26, and a Fractal Dimension of 1.26.

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Is there a newsgroup for PHP anywhere?
by Thomas Gagne Sept. 29, 2000

Sept. 29, 2000

I've looked around on newsguy and haven't found one yet, but I find it unusual a newsgroup hasn't formed yet. Maybe some of the folks around here know? -- .tom

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Crystal Space Python API??
by Jon Brisbin Sept. 29, 2000

Sept. 29, 2000

Is there such a thing as a Python API for an OpenSource game engine...like Crystal Space or similar?? Thanks! -- Jon Brisbin www.jbrisbin.net +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Email: mail(a)jbrisbin.net eFax.com Fax/Voice mailbox: 208.545.5368 PGP public key: http://www.jbrisbin.net/pgpkey.shtml +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

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ANNOUNCE: FXPy-0.99.131 (FOX Extensions for Python)
by Lyle Johnson Sept. 29, 2000

Sept. 29, 2000

This is an update of FXPy, a Python extension module which provides an interface to the FOX cross-platform GUI library: Home Page: http://home.hiwaay.net/~johnson2/FXPy Download Source: ftp://ftp.cfdrc.com/pub/FOX/FXPy-0.99.131.tar.gz Windows Binaries: ftp://ftp.cfdrc.com/pub/FOX/FXPy-0.99.131-win32.exe ftp://ftp.cfdrc.com/pub/FOX/FXPy-0.99.131-Py16-win32.exe ftp://ftp.cfdrc.com/pub/FOX/FXPy-0.99.131-Py20b2-win32.exe To build FXPy from the sources, you will also need to download version 0.99.131 of the FOX library: FOX Home Page: http://www.cfdrc.com/FOX/fox.html Download Source: ftp://ftp.cfdrc.com/pub/FOX/fox-0.99.131.tar.gz ftp://ftp.cfdrc.com/pub/FOX/fox-0.99.131.zip As you may have guessed by now, the latest release of FXPy is version 0.99.131. What is it? ----------- FXPy is a Python extension module which provides an interface to the FOX cross-platform GUI library. With a few minor exceptions, FXPy provides a complete interface to FOX. FOX is a C++-based toolkit for developing graphical user interfaces easily and effectively. Some of the significant features of FOX include: * A rich set of widgets (including dials, shutters, tree lists, and many other "modern" widgets). * Powerful but easy-to-use layout managers. * Extensive support for 3-D modeling using OpenGL or Mesa. * Supports the XDND protocol for drag-and-drop. * Registry for persistent application settings. * Runs natively under Unix/X and Microsoft Windows. * And much, much more! Please see the FOX home page (URL listed above) for more details about the FOX library's features. Also consider subscribing to the foxgui-users mailing list for the latest news about FOX development; again, see the FOX home page for information on this. FXPy is (c) 1999, 2000 Lyle Johnson (ljohnson(a)resgen.com) and is released under the GNU Lesser General Public License. <P><A HREF="http://home.hiwaay.net/~johnson2/FXPy">FXPy-0.99.131</A> - interface to the FOX cross-platform GUI library. (29-Sep-00)

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Re: Fractal Dimension Computation in Python Code
by Mike Brenner Sept. 29, 2000

Sept. 29, 2000

Myk> ... Has anyone got a fast routine for calculating the fractal dimension of a set of points in 2 or 3D space? Thanks. According to the inventor of fractals (Hausdorff in the year 1899), you can place the set of 2D points next to a wall and shine light through them, and the fractal dimension is the percentage of shadow on the wall. If the points are not dense anywhere, then the fractional dimension will be zero. But if parts of them are filled in, then they will cast a shadow. Same with the 3D points, just put them next to a four dimensional wall and shine a four dimensional light through them (the way you measure the amount of holes in a Swiss Cheese :). To do this in Python, you would have to define "dense" as being points that are within a certain distance of each other according to some cohesion metric, and then add up all the parts according to their topological coupling. The algorithm in outline would be something like this: dimension=2 total_area = point_set.integrate_area(dimension,metric) area = 0 coupling = neural_net.cluster(point_set,dimension,metric) for connected_part in coupling: area = area + connected_part.integrate_area(dimension,metric) fractional_dimension = dimension * (total_area - area) / total_area To make this work for real, just program the three missing functions: METRIC computes the distance between two points INTEGRATE_AREA integrates over point sets to get their area CLUSTER divides the set into independent connected point sets If you don't have a neural net available to do the clustering, you can use a genetic algorithm or an annealing algorithm, all of which are equivalent. You could do this in an analog fashion by using a CRT projector onto the wall of a dark room and a sensitive light meter feeding into a ADC connected to your RS-232 or parallel or IEEE or Firewire port. Draw the point set on the screen and have the computer read the light meter, then draw an all white screen and read the light meter again, and take the ratio. Here is the code: graphics.init() graphics.open() dimension = 2 graphics.fill_screen(black) black_area = firewire.read_ADC_voltage() graphics.fill_screen(white) white_area = firewire.read_ADC_voltage() for point in point_set: graphics.draw_point(point,black) area = firewire.read_ADC_voltage() denominator = white_area - black_area numerator = area - black_area fractional_dimension = dimension * numerator - denominator This code requires you install a graphic capability, a firewire capability, a light sensitive meter, an analog-to-digital converter, a firewire driver for the ADC. To do a 3D point set this way, would probably involve techniques such as a tomograph machine to do one slice at a time. Mike Brenner MikeTheMathematician(a)IEEE.org

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xmllib.py example
by Mat�j Cepl Sept. 29, 2000

Sept. 29, 2000

Would anybody be so kind and send me (to the address cepl at bigfoot dot com) simple example of the Python program using xmllib.py (but not so simple as test_xmllib.py :-), please? Thanks Matej

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