Mailman 3 April 2013 - Pythonmac-SIG

possible interaction between python
by Boyd Collier June 25, 2013

June 25, 2013

Hello All, In late February, I thought I'd give python a try, so I took steps to run it on my Mac. Unfortunately, I didn't keep a good record of what those steps were, but the installation seemed to be successful, in that I was able to run a few simple python programs. However, I now suspect that installing python may have messed up something needed to work with my objective-c programs with Xcode. The symptom of a problem in Xcode is that when I set an Xcode project to use LLDB as the debugger (this is the default debugger), Xcode immediately crashes when the run button in the project window is hit. However, projects run properly when I change the debugger to be used to GDB. At least initially, there was no indication that this problem had anything to do with python. I filed an Xcode bug report with Apple and have been following the steps suggested by Apple engineers to try to track down the problem. This morning, they asked me to run the command /Applications/Xcode.app/Contents/Developer/usr/bin/lldb /bin/ls from the terminal, which I did. Here is the result: > Macintosh:~ bcollier$ /Applications/Xcode.app/Contents/Developer/usr/bin/lldb /bin/ls > dyld: Library not loaded: /System/Library/Frameworks/Python.framework/Versions/2.7/Python > Referenced from: /Applications/Xcode.app/Contents/Developer/usr/bin/../../../SharedFrameworks/LLDB.framework/LLDB > Reason: image not found > Trace/BPT trap: 5 My (perhaps erroneous) recollection is that I installed python 3.3, and I see that what is not being loaded is 2.7. I've sent this result to Apple, but perhaps those of you who have been working with python on the Mac and using Xcode might have experienced a similar problem and might be able to suggest what is going on. I'm running OSX 10.7.5 and Xcode 4.6 (but first had the problem with Xcode 4.2). Thanks very much, Boyd Collier Prof. of Biology, Emeritus San Diego State University

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PyObjC and Quartz - CGContextDrawGlyphsAtPoint
by Rand Dvorak May 2, 2013

May 2, 2013

PyObjC on Snow Leopard and Xcode 3.2. I've been trying to draw some text into a PDF context with a custom barcode font. I've tried translating this source, found here to Python: http://www.gogo-robot.com/2009/06/07/two-awkward-things-about-iphone-develo… And here is the relevant code for drawing the barcode: class Barcode(Graphic): initialized = NO def __init__(self, rect, string, size): self.string = string self.font = None self.size = size if not self.initialized: fontpath = NSBundle.mainBundle().pathForResource_ofType_("FRE3OF9X", "TTF") datap = CGDataProviderCreateWithFilename(fontpath.UTF8String()) self.font = CGFontCreateWithDataProvider(datap) #CGDataProviderRelease(datap) self.initialized = YES Graphic.__init__(self, rect) def draw(self,c): length = len(self.string) glyphs = objc.allocateBuffer(length) chars = objc.allocateBuffer(length + 1) self.string.getCString_maxLength_encoding_(chars, length + 1, NSASCIIStringEncoding) for i in range(length): glyphs[i] = chr(ord(chars[i]) - 29) CGContextSaveGState(c) CGContextSetFont(c, self.font) CGContextSetFontSize(c, self.size) CGContextSetRGBFillColor(c, 0, 0, 0, 1) CGContextSetRGBStrokeColor (c, 0, 0, 0, 1) CGContextSetTextMatrix (c, self.xform) CGContextShowGlyphsAtPoint(c, 0, 0, glyphs, length) CGContextRestoreGState(c) Getting this error: CGContextShowGlyphsAtPoint(c, 0, 0, glyphs, length) ValueError: depythonifying 'unsigned short', got 'str' Can anybody point me in the right direction in how to properly prepare a data structure to pass to the CGContextShowGlyphsAtPoint(..) function. Can I use ctypes? Any help appreciated. Thanks.

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Biggest Fake Conference in Computer Science
by eliswilson＠hushmail.com April 30, 2013

April 30, 2013

Biggest Fake Conference in Computer Science We are researchers from different parts of the world and conducted a study on the world’s biggest bogus computer science conference WORLDCOMP http://sites.google.com/site/worlddump1 organized by Prof. Hamid Arabnia from University of Georgia, USA. We submitted a fake paper to WORLDCOMP 2011 and again (the same paper with a modified title) to WORLDCOMP 2012. This paper had numerous fundamental mistakes. Sample statements from that paper include: (1). Binary logic is fuzzy logic and vice versa (2). Pascal developed fuzzy logic (3). Object oriented languages do not exhibit any polymorphism or inheritance (4). TCP and IP are synonyms and are part of OSI model (5). Distributed systems deal with only one computer (6). Laptop is an example for a super computer (7). Operating system is an example for computer hardware Also, our paper did not express any conceptual meaning. However, it was accepted both the times without any modifications (and without any reviews) and we were invited to submit the final paper and a payment of $500+ fee to present the paper. We decided to use the fee for better purposes than making Prof. Hamid Arabnia richer. After that, we received few reminders from WORLDCOMP to pay the fee but we never responded. This fake paper is different from the two fake papers already published (see https://sites.google.com/site/worlddump4 for details) in WORLDCOMP. We MUST say that you should look at the above website if you have any thoughts of participating in WORLDCOMP. DBLP and other indexing agencies have stopped indexing WORLDCOMP’s proceedings since 2011 due to its fakeness. See http://www.informatik.uni-trier.de/~ley/db/conf/icai/index.html for of one of the conferences of WORLDCOMP and notice that there is no listing after 2010. See Section 2 of http://sites.google.com/site/dumpconf for comments from well-known researchers about WORLDCOMP. The status of your WORLDCOMP papers can be changed from scientific to other (i.e., junk or non-technical) at any time. Better not to have a paper than having it in WORLDCOMP and spoil the resume and peace of mind forever! Our study revealed that WORLDCOMP is money making business, using University of Georgia mask, for Prof. Hamid Arabnia. He is throwing out a small chunk of that money (around 20 dollars per paper published in WORLDCOMP’s proceedings) to his puppet (Mr. Ashu Solo or A.M.G. Solo) who publicizes WORLDCOMP and also defends it at various forums, using fake/anonymous names. The puppet uses fake names and defames other conferences to divert traffic to WORLDCOMP. He also makes anonymous phone calls and threatens the critiques of WORLDCOMP (See Item 7 of Section 5 of above website). That is, the puppet does all his best to get a maximum number of papers published at WORLDCOMP to get more money into his (and Prof. Hamid Arabnia’s) pockets. Prof. Hamid Arabnia makes a lot of tricks. For example, he appeared in a newspaper to fool the public, claiming him a victim of cyber-attack (see Item 8 in Section 5 of above website). Monte Carlo Resort (the venue of WORLDCOMP for more than 10 years, until 2012) has refused to provide the venue for WORLDCOMP’13 because of the fears of their image being tarnished due to WORLDCOMP’s fraudulent activities. That is why WORLDCOMP’13 is taking place at a different resort. WORLDCOMP will not be held after 2013. The draft paper submission deadline is over but still there are no committee members, no reviewers, and there is no conference Chairman. The only contact details available on WORLDCOMP’s website is just an email address! We ask Prof. Hamid Arabnia to publish all reviews for all the papers (after blocking identifiable details) since 2000 conference. Reveal the names and affiliations of all the reviewers (for each year) and how many papers each reviewer had reviewed on average. We also ask him to look at the Open Challenge (Section 6) at https://sites.google.com/site/moneycomp1 and respond if he has any professional values. Sorry for posting to multiple lists. Spreading the word is the only way to stop this bogus conference. Please forward this message to other mailing lists and people. We are shocked with Prof. Hamid Arabnia and his puppet’s activities at http://worldcomp-fake-bogus.blogspot.com Search Google using the keyword worldcomp fake for additional links.

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PyObjC and Quartz - CGContextShowGlyphsAtPoint
by Rand Dvorak April 29, 2013

April 29, 2013

See the second message with more specifics and code, I was able to get it working by translating this objective-c code: http://www.gogo-robot.com/2009/06/07/two-awkward-things-about-iphone-develo… into this code: def draw(self,c): length = len(self.string) glyphs = objc.allocateBuffer(length) chars = objc.allocateBuffer(length + 1) self.string.getCString_maxLength_encoding_(chars, length + 1, NSASCIIStringEncoding) for i in range(length): glyphs[i] = chr(ord(chars[i]) - 29) CGContextSaveGState(c) CGContextSetFont(c, self.font) CGContextSetFontSize(c, self.size) CGContextSetRGBFillColor(c, 0, 0, 0, 1) CGContextSetRGBStrokeColor (c, 0, 0, 0, 1) CGContextSetTextMatrix (c, self.xform) CGContextShowGlyphsAtPoint(c, 0, 0, glyphs, length) CGContextRestoreGState(c) changing: CGContextShowGlyphsAtPoint(c, 0, 0, glyphs, length) to: CGContextShowGlyphsAtPoint(c, 0, 0, tuple(map(ord, glyphs)), length) Sadly, CTFontGetGlyphsForCharacters(...), doesn't seem to be in the bridgesupport on 10.6 and I still need to support it. A CGGlyph is apparently an unsigned short, so a char array returned by objc.allocateBuffer() seems to suffice. Thanks for your help.

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PyObjC and Quartz - CGContextShowGlyphsAtPoint
by Rand Dvorak April 29, 2013

April 29, 2013

Hello, I was wondering if any would could help with a issue I'm having with some PyObjC and Quartz. I have a class the creates a pdf contact sheet from a list of images. I have the need to include bar codes along with each image. On the sheet is text with the filename of each image and I need to add a barcoded filename along with it. To this end I downloaded some barcode fonts and am trying to use CGContextDrawTextAtPoint(...) to draw the barcode but am not having any luck. Through some research I determined that I need to call CGContextDrawGlyphsAtPoint(...) instead, but cannot figure how to get the glyphs to to draw. I tried just using the bare string, but am getting this error. CGContextShowGlyphsAtPoint(c, 5, 5, self.string.cStringUsingEncoding_(NSUTF8StringEncoding), len(self.string)) ValueError: depythonifying 'unsigned short', got 'str' Any ideas on how to achieve what I am trying to accomplish here? Any info would be much appreciated. Thanks, Rand

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Py2App and PyQt4 Issues
by J Silverman April 27, 2013

April 27, 2013

Hi All, I'm attempting to get py2app and PyQt4 to work on my Mac running OSX 10.6. I've tried multiple variations of Python (2.7.4, 3.2.4, 3.3.1, etc), and also tried both the premade binary of PyQtx and compiled my own of the most recent stable version of PyQt4 (4.10.1). Yet despite this, I get extremely similar results if I try building and running one of the example PyQt4 scripts included with Py2App. On using Py2App with some of the variations above I'll get a bunch of these error messages during the build: /usr/bin/strip: object: /Users/g1powermac/Desktop/py2app-0.7.3/examples/PyQt/hello_app/dist/hello.app/Contents/Resources/lib/python2.7/lib-dynload/PyQt4/QtCore.so malformed object (unknown load command 7) There is only one variation where I don't get that message and that is if I use my own compiled version of PyQt4 and Python 3.3.1. However, if I double click on the subsequent app, I get a screen that says "hello Error" with either an option to open the Console or Terminate. Upon opening the Console, I see these error messages: 4/27/13 2:11:05 PM [0x0-0x25025].org.pythonmac.unspecified.hello[9513] Traceback (most recent call last): 4/27/13 2:11:05 PM [0x0-0x25025].org.pythonmac.unspecified.hello[9513] File "/Users/g1powermac/Desktop/py2app-0.7.3/examples/PyQt/hello_app/dist/hello.app/Contents/Resources/__boot__.py", line 43, in <module> 4/27/13 2:11:05 PM [0x0-0x25025].org.pythonmac.unspecified.hello[9513] _run() 4/27/13 2:11:05 PM [0x0-0x25025].org.pythonmac.unspecified.hello[9513] File "/Users/g1powermac/Desktop/py2app-0.7.3/examples/PyQt/hello_app/dist/hello.app/Contents/Resources/__boot__.py", line 38, in _run 4/27/13 2:11:05 PM [0x0-0x25025].org.pythonmac.unspecified.hello[9513] exec(compile(source, path, 'exec'), globals(), globals()) 4/27/13 2:11:05 PM [0x0-0x25025].org.pythonmac.unspecified.hello[9513] File "/Users/g1powermac/Desktop/py2app-0.7.3/examples/PyQt/hello_app/dist/hello.app/Contents/Resources/hello.py", line 5, in <module> 4/27/13 2:11:05 PM [0x0-0x25025].org.pythonmac.unspecified.hello[9513] a = Qt.QApplication(sys.argv) 4/27/13 2:11:05 PM [0x0-0x25025].org.pythonmac.unspecified.hello[9513] AttributeError: 'module' object has no attribute 'QApplication' 4/27/13 2:11:05 PM hello[9513] hello Error 4/27/13 2:11:07 PM com.apple.launchd.peruser.501[252] ([0x0-0x25025].org.pythonmac.unspecified.hello[9513]) Exited with exit code: 255 By the way, this is using Qt 4.8.4 and I could run the hello.py directly with python so it seems PyQt4 is installed correctly. Does anyone know how to get this working? Thanks, J Silverman

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Environment variable issues running py2app application
by Paul Wiseman April 25, 2013

April 25, 2013

Hey, I've never seen this problem before but one user seems to be experiencing this issue and I'm at a bit of a loss as to what the cause could be One part of the app runs this: subprocess.Popen(['/usr/bin/env', 'system_profiler', 'SPUSBDataType', '-xml']) I've never seen a problem running this, however in one users logs it's returning: env: system_profiler: No such file or directory So I thought that maybe their PATH variable doesn't include path to the binary, I asked them to provide the output of '/usr/bin/env' and 'which system_profiler' 'which system profiler' returned '/usr/sbin/system_profiler' and '/usr/sbin' was in their PATH variable that returned from /usr/bin/env, so I don't really get what's going on. This also looks like it only happens if the user opens the .app directly, but if they open the binary directly in the .app/Contents/MacOS/ folder, it works and it can find these external binaries through subprocess. I'm really not sure what might be causing this? and I've never experienced it myself when testing, nor has it ever been reported before which makes me inclined to believe it's some external setting / config on the users machine which is causing this behaviour? Thanks! Paul

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py2app questions..
by Chris Barker - NOAA Federal April 15, 2013

April 15, 2013

First: Ronald, thanks for keeping py2app up to date! The good news: I just ran a recent py2app on an older app of mine, and it all worked out of the box. However, the resulting bundle is HUGE. A lot of this is inevitable, I'm using a universal build, and some big packages, but there seems to be some room for improvement: The app in question is using: wxPython numpy a tiny bit of scipy matplotlib So it's going to be big! Numpy, scipy and matplotlib all have a lot of intertwining modules, many of which get imported whether you need them or not, so probably the best one can do is include them all (more on that later) However, I'm getting a couple packages that I have no idea why: OpenGL email zmq hand-removing them from the bundle doesn't break anything. I'm wondering if their recipes are getting triggered by accident somehow -- how can I tell how/why a particular package got included? I'm also getting a number of *.so files that I don't understand -- some of the larger ones are: _bsddb.so _sqlite3.so _imaging.so (is that PIL?) there are a LOT more, but it's had to know what they are from just the names, and most are pretty small anyway (except the wx ones that I need and expect to be big...) I understand that it's a goal of py2app to work "out of the box" without needing to hand-tweak a lot to get it to work. This is a worthy goal, and the recipes approach works great. However, it would be nice if there was an alternate approach that made it easier to build a more optimized package. One idea: Py2app (and all the other stand-alone builders I've looked at) figure out want to include from source code analysis. however, as it's pretty common for packages to "import" stuff that may not be used a particular app, you can get a lot of stuff you dontt need. For instance, I'm pretty sure that PIL import tkInter. These imports are often wrapped in an if clause or inside a function that may never get called, but source code analysis isn't going to find all of those, so the same thing to do is include it all -- resulting in bloated packages. I propose an alternative -- analysis of the app at run-time: The user would run the app (maybe a test suite), then we'd take a look at sys.modules and see everything that was actually loaded. This would miss anything that wasn't exercised by the code you ran, but for most cases, a test suite would bring in everything (comprehensive test suites are hard to come by, but all it would need to do is test enough to import every package it might use -- that's not a heavy lift). This seems so easy -- am I missing something??? To support this, py2app would need a way to bypass the source code analysis, and instead load a data file with the list of modules that need to be included. Actually, as it sometimes takes a while to scan teh code, it would be nice of py2app could optinally dump the results of teh source code analysis, and be abel to re-load it later, rather than needed to re-run. 1) Am I missing something as to why the run-time analysis wouldn't work ? 2) how hard would it be to patch py2app to load a module list, rather than scan the source? Thoughts?? -Chris -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (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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Re: [Pythonmac-SIG] py2app questions..
by Chris Barker - NOAA Federal April 12, 2013

April 12, 2013

On Thu, Apr 11, 2013 at 10:50 PM, Ronald Oussoren <ronaldoussoren(a)mac.com> wrote: > On 11 Apr, 2013, at 23:50, Chris Barker - NOAA Federal <chris.barker(a)noaa.gov> wrote: >> *** using recipe: virtualenv *** >> *** using recipe: sip *** ... >> It looks like the recipes for ALL of the packages I have installed are >> being run -- a bug perhaps? > > That's not a bug, all recipes get called on every build and each one checks if it actually has to do something (mostly by checking for the presence of modules in the dependency graph). hmm -- maybe a re-write of that message to something like "checking recipe: something". But anyway, as far as I can tell, I'm getting all the packages there is a recipe for that I have installed. Or certainly a bunch of extras. I'll poke into the dependency graph and see if I can see what's going on. -Chris -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (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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Re: [Pythonmac-SIG] Good way for beginner to get started with Python?
by John Velman April 7, 2013

April 7, 2013

Thanks, Barry. This looks like just the right thing. The only problem may be the timing,since it starts about a month too soon relative the ending of the school year. But have sent the info for him to look into. John V. On Sat, Apr 06, 2013 at 07:54:29PM -0500, Barry McClendon wrote: > John, > > See if he might be interested in this course: > https://www.coursera.org/course/interactivepython > > Barry > > On Apr 6, 2013, at 6:22 PM, John Velman <velman(a)cox.net> wrote: > > > Reply-To: > > > > I'm looking for a way to get a bright (of course) high school student > > started with Python. He has a recent iMac. He is pretty computer literate, > > and knows the names of some computer languages, but no experience in > > programming, and little experience with text editing per se. He is > > particularly interested in games. Is at a stage of trying to decide what he > > is going to do in college, and was asking me about getting started with > > computer programming. > > > > I recommend Python as a good starting language. It would be nice if there > > was a simple IDE that works with python without a lot of setting up > > options, moving things around in the file system, and so on. I don't want > > to throw him into Vim or Emacs. > > > > I'd like him to get to something interesting (GUI, very simple games) soon. > > I showed him some examples from Pythonista on my iPad, and he was impressed > > at what could be done in ~ 100 lines of Python. > > > > For now, it would be really nice if he could work with the Python already > > on his iMac, and minimal other setup. Maybe the TKInter that comes with the > > iMac would also be a place to start GUI. It looks like installing > > TextWrangler might be a good choice for an editor. Or just plain TextEdit? > > > > I've looked at PyGames, and done a little other googling, and every place > > I've looked says install this, install that, use Home Brew, use Ports, > > don't use Ports, be sure and set such and such an option, be sure and get a > > version greater than x.y...Things that I might do, but I've been at this, > > at least part time, more or less forever. > > > > We need something than one can just do, and then learn while doing. Well, > > something Mac like. > > > > (I myself haven't used Python much for a while, am trying to develop one > > good app in Objective C on an hour or so a day. I use the Xcode IDE, Vim > > outside of Xcode. Am personally a dynasaur, am mailing this via Mutt.) > > > > Any suggestions will be greatly appreciated. > > > > John V. > > _______________________________________________ > > Pythonmac-SIG maillist - Pythonmac-SIG(a)python.org > > http://mail.python.org/mailman/listinfo/pythonmac-sig > > unsubscribe: http://mail.python.org/mailman/options/Pythonmac-SIG

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