🌐 Mailman 3 February 2005 - Pythonmac-SIG - python.org

Re: [Pythonmac-SIG] algorithm wanted
by has Feb. 2, 2005

Feb. 2, 2005

Henning Hraban Ramm wrote: >I'm looking for a better algorithm... This is probably as terse as it gets: def bool2cm0k(lst): """Converts a list of booleans to a CMYK color string, e.g. [True, False, False, True] to 'C00K' """ return ''.join([b and c or '0' for b, c in zip(lst, 'CMYK')]) def cm0k2bool(s): """Converts a CMYK color string to a list of booleans, e.g. 'CM0K' to [True, True, False, True] """ return [c1 == c2 for c1, c2 in zip(s, 'CMYK')] print bool2cm0k([True, False, False, True]) # --> C00K print cm0k2bool('CM0K') # --> [True, True, False, True] HTH has -- http://freespace.virgin.net/hamish.sanderson/

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Compiling matplotlib on OS-X without Fink
by Chris Barker Feb. 2, 2005

Feb. 2, 2005

Hi all, I just got matplotlib working on my box, so I thought I'd post this, so that it will be in the archives, and because I'd like others to try it and let me know if it doesn't work for you. One question for the knowledgeable folks here: I have /usr/include/zlib.h on my system, but I have no idea where I got it. I do know that it isn't on other systems in my office without the dev tools. Did it come with the dev tools, or something else I installed? Anyway, here's what worked for me: Installing matplotlib on OS-X (10.3.7) Here are my notes as to what it took to get matplotlib (0.71) installed and working on OS-X. I have so far kept a fink-free system, so that's what I've done here as well. I use it with the AGG back end for generating images for a web site, and hopefully with the wx backend for interactive use and embedding in wx Applications. 1) Requirements: ------------------------------------------- According to the matplotlib install docs (http://matplotlib.sourceforge.net/installing.html), you need the following: freetype (>= 2.1.7) libpng zlib Personally, I've been avoiding Fink, as it doesn't seem to play well with the rest of OS-X, including the Apple supplied Python, so I've looked elsewhere for these libs. a) Freetype: I seem to have it in: /usr/X11R6/include/freetype2 I don't think I installed it myself, so it probably came with Apple's X11, Which I did install. However, I seemed to be having problems with that version, so I looked, and it seems to be: libfreetype.6.3.dylib Given that freetype2 is currently at version 2.1.9, I have no idea what to make of that! So off to sourceforge to get a new freetype: http://freetype.sourceforge.net/index2.html where I got: freetype-2.1.9.tar.gz Following the instructions in docs/INSTALL.UNX: $ ./configure $ make $ sudo make install That puts it in /usr/local/..., which is a good place for it. b) zlib: I have: /usr/include/zlib.h I don't know where I might have gotten it, but there it is. NOTE: I checked on another system in my office, and it doesn't have zlib. It also doesn't have any developer tools installed, so you couldn't build anything on it anyway. If zlib comes with XCode tools, anyone who can build should have it. It also may have come with some other package I've installed, but I have no idea what. Let me know if you know. c) libpng: This, I didn't have on my system, except inside the wxWidgets source tree, so I went looking for it. Note that you need zlib to compile libpng, so make sure you have that first. I did a google search for "libpng OS-X". I found: http://www.libpng.org/pub/png/pngcode.html Which led me to the libpng sourceforge site. From there I downloaded: libpng-1.2.8.tar.gz unpacked it, and opened a terminal in the libpng-1.2.8 directory, and did: $ cp scripts/makefile.darwin ./makefile (note that according to the INSTALL, there is supposed to be a makefile.macosx, but it wasn't there) I took a look in the makefile, and found: ZLIBLIB=/usr/local/lib ZLIBINC=/usr/local/include Which is not where zlib is on my system. However, while I can find zlib.h, I couldn't fine the actual lib, so I tried make without changing anything. $ make Which seemed to work fine. zlib must be installed in a standard location, and gcc found it. $ sudo make install to install the lib into /usr/local/ (this was specified in the makefile, and it's a good place for it) $ make test and $ ./pngtest pngnow.png Which both seemed to pass. d) Numeric or numarray: I already have Numeric installed, from Bob Ippolito's PIMP (MacPython Package Manager) repostitory. (www.undefined.org/python) 2) Building matplotlib --------------------------------------------------------- First, I took a look at the matplotlib setup.py. It had "auto" for the back-end flags, so I thought I would give it a try that way: $python setup.py build That worked! $ sudo python setup.py install 4) And now to test! $python >>> import pylab Could not open font file /Library/Fonts/NISC18030.ttf No module named pygtk PyGTK version 1.99.16 or greater is required to run the GTK Matplotlib backends This turns out to be because the matlabrc file sets the GTKAgg back end as the default. You have two choices. 1) you can set the back end before importing pylab. >>> import matplotlib >>> matplotlib.use('Agg') >>> import pylab This works fine 2) Edit the matplotlibrc file. I found it in: /System/Library/Frameworks/Python.framework/Versions/2.3/share/matplotlib/.matplotlibrc Change the line: backend : GTKAgg # the default backend to backend : Agg # the default backend And you're all set to make images for the web, etc. I'm going to leave getting it to work with wxPython for another day. -Chris -- Christopher Barker, Ph.D. Oceanographer NOAA/OR&R/HAZMAT (206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception Chris.Barker(a)noaa.gov

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Reading the resource fork with Python?
by Bill Janssen Feb. 2, 2005

Feb. 2, 2005

Given a filename on an HFS volume, what call do I use to see if it has a resource fork, and if there's anything in it? How do I read that data? I'm trying to read the URL out of a .webloc file, if that helps. Bill

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How do I make a binary matplotlib distribution on OS-X?
by Brendan Simons Feb. 2, 2005

Feb. 2, 2005

> See my previous message about building matplotlib on OS-X. Now that > I've done that, I need to give it to some of my coworkers that don't > have the dev tools installed, and are aghast at the idea of typing > ./configure; make, make install. > > So, how do I make a binary distro? Wow, serendipity! I was just sitting down to the challenge of building matplotlib on os-x myself. Please keep the list(s) updated on your progress. I would certainly prefer running an install script or mpkg than trying to compile all the dependencies. *sending karma, Brendan ______________________________________________________________________ Post your free ad now! http://personals.yahoo.ca

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Did I bust py2app?
by Charles Hartman Feb. 1, 2005

Feb. 1, 2005

I haven't used it for a while. Now when I try to make an app of the thing I've been working on -- OR of a separate package (part of appscript)! -- I get "ObjectGraph not found." ObjectGraph.py(c) *is* in /Library/Python/2.3/py2app/altgraph. So what did I do?? Charles Hartman

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algorithm wanted
by Ramm, Henning Feb. 1, 2005

Feb. 1, 2005

Hi there! I'm looking for a better algorithm... In a print project I must know if some page needs every CMYK separation or just some; I keep this info in a boolean list like [True, True, False, True] for C,M,K (no Y plate). But our workflow database needs a string like "CM0K" (plate letter or zero). How can I convert this best? Here is my code: class ProcessColors: _cmykMap = ['C', 'M', 'Y', 'K'] def __init__(self, C=False, M=False, Y=False, K=True): self.werte = [C,M,Y,K] def bool2str(self, werte=None): """converts a list of booleans to a CMYK color string, e.g. [True, False, False, True] to 'C00K'""" if not werte: werte = self.werte for i in range(0,4): if werte[i]: werte[i] = self._cmykMap[i] else: werte[i] = '0' return string.join(werte, '') def str2bool(self, werte='000K'): """converts a CMYK color string to a list of booleans, e.g. 'CM0K' to [True, True, False, True]""" werte = list(werte) for i in range(0,4): if werte[i]==self._cmykMap[i]: werte[i] = True else: werte[i] = False return werte I hope the same is possible without 'if' and 'for', perhaps some lambda+boolean wizardry? Best regards, ----------------------- Henning Hraban Ramm Südkurier Medienhaus / MediaPro Abt. Systembetreuung

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