🌐 Mailman 3 April 2011 - Pythonmac-SIG - python.org

Deepcopy failure. How to find what failed?
by Lou Pecora April 28, 2011

April 28, 2011

I am trying to make a Deepcopy of an object with several objects as data. I get an error "instancemethod expected at least 2 arguments, got 0" (complete error message below -- sorry, it's long one), but I have no idea what that refers to or what is failing. Is there a way to tell what is failing to Deepcopy? More info: I tried Deepcopy on some of the data objects in my original object instance and they all got copied without errors. So it is something else in my original object, but I cannot get very far given the error messages. I also tried to use Pool and Pool.map on this object (I'm trying to use multiprocess module, but let's keep things simple for now). The latter failed, giving a pickle error. I suspect it's the same problem. Any help appreciated. Error Traceback: --------------------------------------------------------------------------- TypeError Traceback (most recent call last) /Users/louispecora/calc/Well-Barrier_systems/VDWB2P/VDWB2P_1/drvrVDWB2P_1.py in <module>() 121 Ei=Erangelist[i]; Ef=Erangelist[i+1]; nE=nElist[i+1] 122 # 0th item tells driverbem which function to call in pool.map --> 123 args.append([CP.deepcopy(dvrbem),Ei,Ef,nE,prnresF, figdir, prnresF, adaptF, mindeldTdE, minStep, maxStep]) 124 print '\nargs:\n',args 125 sys.exit() /Applications/sage-4.6/local/lib/python/copy.pyc in deepcopy(x, memo, _nil) 187 raise Error( 188 "un(deep)copyable object of type %s" % cls) --> 189 y = _reconstruct(x, rv, 1, memo) 190 191 memo[d] = y /Applications/sage-4.6/local/lib/python/copy.pyc in _reconstruct(x, info, deep, memo) 336 if state: 337 if deep: --> 338 state = deepcopy(state, memo) 339 if hasattr(y, '__setstate__'): 340 y.__setstate__(state) /Applications/sage-4.6/local/lib/python/copy.pyc in deepcopy(x, memo, _nil) 160 copier = _deepcopy_dispatch.get(cls) 161 if copier: --> 162 y = copier(x, memo) 163 else: 164 try: /Applications/sage-4.6/local/lib/python/copy.pyc in _deepcopy_dict(x, memo) 253 memo[id(x)] = y 254 for key, value in x.iteritems(): --> 255 y[deepcopy(key, memo)] = deepcopy(value, memo) 256 return y 257 d[dict] = _deepcopy_dict /Applications/sage-4.6/local/lib/python/copy.pyc in deepcopy(x, memo, _nil) 160 copier = _deepcopy_dispatch.get(cls) 161 if copier: --> 162 y = copier(x, memo) 163 else: 164 try: /Applications/sage-4.6/local/lib/python/copy.pyc in _deepcopy_dict(x, memo) 253 memo[id(x)] = y 254 for key, value in x.iteritems(): --> 255 y[deepcopy(key, memo)] = deepcopy(value, memo) 256 return y 257 d[dict] = _deepcopy_dict /Applications/sage-4.6/local/lib/python/copy.pyc in deepcopy(x, memo, _nil) 187 raise Error( 188 "un(deep)copyable object of type %s" % cls) --> 189 y = _reconstruct(x, rv, 1, memo) 190 191 memo[d] = y /Applications/sage-4.6/local/lib/python/copy.pyc in _reconstruct(x, info, deep, memo) 321 if deep: 322 args = deepcopy(args, memo) --> 323 y = callable(*args) 324 memo[id(x)] = y 325 if listiter is not None: /Applications/sage-4.6/local/lib/python/copy_reg.pyc in __newobj__(cls, *args) 91 92 def __newobj__(cls, *args): ---> 93 return cls.__new__(cls, *args) 94 95 def _slotnames(cls): TypeError: instancemethod expected at least 2 arguments, got 0 logout -- Lou Pecora, my views are my own.

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Compiling xib files with py2app
by Orien Madgwick April 25, 2011

April 25, 2011

Hi, I'm having difficulty compiling xib files when packaging a python application with py2app 0.6.2. I haven't been able to find any documentation on how this should work but my expectation is that if I declare the xib file in the data_files section of my setup.py then it should be converted to a nib file and included in the application package. Is this a correct expectation? The behaviour I'm seeing is the xib file is simply copied to the application package without processing. Any help on the correct way to approach this would be great. -- Orien

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Is this a reasonable way to do multiprocessing?
by Lou Pecora April 19, 2011

April 19, 2011

I have a calculation which runs via a method of a class. It is trivially parallelizable. The method is just called over and over with different arguments. No communication, synchronization, or cooperation is needed between the function calls. But it is highly computational and I want to speed it all up. I discovered the multiprocessing module and the use of Pool. So my thought was to do something like this, import multiprocessing as MP class mainclass(object): def aMethod(x): # do stuff with x return result myclass=mainclass() pool= MP.Pool(processes= 3) # 3 CPU workers, for example theargs= [x1,x2,x3] resultlist= pool.map(myclass.aMethod, thargs) But as many of you probably know that raises a pickle error. I did a little research and don't fully understand, but I thought of a way around this that is pedestrian, but it works on my toy example. I just make (deep) copies of my object and let a helper function call mainclass' aMethod. So I change the code (after my class definition) to, import copy def helperFunc(a): return a[0].aMethod(a[1]) myclass=mainclass() pool= MP.Pool(processes= 3) # 3 CPU workers theargs= [[copy.deepcopy(myclass),x1],[copy.deepcopy(myclass),x2], \ [copy.deepcopy(myclass),x3]] resultlist= pool.map(helperFunc, thargs) My question (subject of this post): Is this reasonable? Not whether it's the best or most efficient, but does it go most of the way in this situation to give me much more speedup? Further question, on an 8 CPU MacBook Pro I get a 4X speedup (with 8 CPU workers), not 8X (Activity Monitor shows all 8 CPUs are utilized ~100%). Is there something about dual core processors that I should know about? (since 4 = 8/2). Thanks for any pointers or info. -- Lou Pecora, my views are my own.

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custom framework with bridgesupport file
by Georg Seifert April 19, 2011

April 19, 2011

Hi, I have an app written in cocoa and run python scripts from within the app using "PyRun_SimpleString" (I asked about that a couple of times and got great help). My problem now is that I want to use some c functions from within a custom framework that is embedded in my app. The only way I could get it to work is to load the bridgesupport file manually: _path = objc.pathForFramework('../Frameworks/MyFramework.framework') f = open(_path+'/Versions/A/Resources/BridgeSupport/MyFramework.bridgesupport') objc.parseBridgeSupport(f.read(), globals(), _path+'/Versions/A/Resources/BridgeSupport/MyFramework.bridgesupport') f.close() I have to put this in the script for every run. Is there a better way to tell python to pick the file up automatically? Best Georg

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Tkinter app in Mac App Store
by Kevin Walzer April 15, 2011

April 15, 2011

Hi all, I'm just writing to mention that I've had a Tkinter app approved in the Mac App Store, QuickWho (http://www.codebykevin.com/quickwho.html). I'm pretty sure it's not the first Python app included in the App Store (I believe there are a few PyObjC apps there), but there has been little discussion of the App Store on this list, so I wanted to share a few experiences, in case anyone is planning to submit a Tkinter-based program to the App Store. Most of my challenges revolved around the fact that Tk-Cocoa uses numerous calls into private methods and API's (or SPI, I guess), and so you can't bundle the Tcl/Tk frameworks with your application. The workaround for this is to link your application to the Tcl/Tk Cocoa frameworks that are bundled with OS X in /System/Library. As has been well-documented, this build of Tk is rather buggy, so proceed with caution. Using this approach requires a custom build of Python that links to the frameworks in /System/Library rather than in /Library; the simplest way to make sure of this is to move other installations of Tcl/Tk in /Library/Frameworks to another location. I outline some details about this in more depth here: http://www.codebykevin.com/opensource/app-store.html. This article doesn't mention Python (it focuses instead on Tk), but most of it is applicable, and can be supplemented by what I've outlined in this e-mail. Hope others find this useful, Kevin -- Kevin Walzer Code by Kevin http://www.codebykevin.com

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py2app + wxpython -> ImportError
by Christian K. April 14, 2011

April 14, 2011

Hi, I tried to make an app using py2app on OSX 10.6.5, python 2.6.5, wxpython 2.8.11.0 Building works, but when running I get File "wx/lib/pubsub/pub.pyc", line 24, in <module> File "wx/lib/pubsub/core/listener.pyc", line 13, in <module> ImportError: No module named listenerimpl I had (other) problems with pubsub using py2exe, too, and I needed to add 'wx.lib.pubsub' to the 'package' section of the setup options dict. That did not help py2app though. Any ideas? Regards, Christian

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py2app wierdness
by Daniel Rogers April 14, 2011

April 14, 2011

Hi, I installed py2app with easy_install, using the system python on Mac OS X. Now when I try to build a .app that needs additional data directories, those additional data directories are not being copied to the application bundle. For example, I have a directory "fonts" Regardless of if I add ['fonts'] as the value of "data_files" in the call to setup.py, or add 'fonts' as the value of 'resources' in the OPTIONS dict, "fonts" is not being copied to Contents/Resources and my application fails to startup correctly. If I copy the directory to the resources path my hand the application will start normally. Does the "data_files" option supposed work? For all that I can tell, it doesn't work for the 'pygame' example either. -- Daniel

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why does the Mac installer hack the user's .bash_profile?
by Bill Janssen April 11, 2011

April 11, 2011

I've got a Snow Leopard buildslave I'm trying to debug. So I thought I'd try Python 2.7 on it. Normally, I advise people to never try to install a different Python on a Mac, as it's too embedded in the OS to do safely, without a great deal of domain knowledge. But here, I figured I could always wipe the disk and start over without too much loss. So I ran the installer, and tried a few things, and it didn't solve my buildbot problems. So I decided to go back to the original System python. But now I find that the installer has put the 2.7 Python on my PATH?!? It does this apparently by hacking ~/.bash_profile. In there, there's a line saying The original version is saved in .bash_profile.pysave a file which doesn't seem to exist. So, why didn't I notice myself checking the checkbox to do this in the first place, and where is my original .bash_profile file? Bill

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HotKeys and LaunchServices
by Valentino Volonghi April 11, 2011

April 11, 2011

I've fixed yesterday's problem and it was my fault for not setting the File's Owner in Interface Builder. My current problem though is different and I don't know how to approach it. I am trying to do the last 2 bits of the application: start on login and register a global hotkey. start on login requires LaunchServices and in objective-C it would be a matter of running this: http://cocoatutorial.grapewave.com/tag/lssharedfilelist-h/ Unfortunately there are 2 problems with that code: 1) LSSharedFileListRef is not iterable and I don't know how to cast it to (NSArray *) in objective-C or to make it iterable. 2) kLSSharedFileListItemLast is not exported (this wouldn't be a complex problem if it wasn't for point 1 (I could pass the last item inside the function of course but I'd need to iterate it first). I tried to use: _objc.loadBundleVariables(__bundle__, globals(), [('kLSSharedFileListItemLast', '^{OpaqueLSSharedFileListItemRef=}')]) but it segfaults. Now the second problem is hotkey... That's Carbon API and from the HotKey.py example it would be available under CarbonEvt which is unfortunately absolutely empty while CarbonEvents is not but one without the other is not gonna be very useful. So without RegisterEventHotKey and UnregisterEventHotKey I don't think I have many chances to do this, at least in Python. I'd need to go the C way and wrap it in a module. Alternatively is there a way to avoid wrapping in C and instead, just for these 2 cases, and use an ffi method like ctypes? -- Valentino Volonghi aka Dialtone Now Running MacOSX 10.6 http://www.adroll.com/

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Trouble with NSWindowController
by Valentino Volonghi April 10, 2011

April 10, 2011

Hi, I'm using Mac OSX 1.6.8 with XCode4, built-in python and PyObjC and I'm trying to use NSWindowController. My application is an agent application (no dock, no menu, only a statusbar item with menu). When somebody presses "preferences" from the menu I bring up a preferences window located in a separate nib file named "Preferences.xib". At the bottom of this email is the code I'm referring to. My problem is that NSWindowController.window() always returns None. Regardless if in InterfaceBuilder I've setup an object that points to PrefsController with the proper outlets and such. self.window seems to be a native_selector and the call to it succeeds because isWindowLoaded works as expected and showWindow actually displays the window. I thought it could be a problem with ownership but self.owner() is actually self. Is there something I'm missing? I've read a couple of examples but they don't seem to be doing anything special about this, it just works. In the delegate I have: import preferences class binderAppDelegate(NSObject): preferences = None def awakeFromNib(self): # snip some code self.preferences = preferences.PrefsController("Preferences") @objc.IBAction def openPreferences_(self, sender): NSLog("openPreferences was called.") self.preferences.display() And preferences.py is this: from Cocoa import * class PrefsController(NSWindowController): def __new__(cls, nibFile): return cls.alloc().initWithWindowNibName_(nibFile) @objc.selector def display(self): NSLog("display got called %s" % (self.isWindowLoaded(),)) window = self.window() NSLog("display got called %s" % (self.isWindowLoaded(),)) self.showWindow_(self) self.window().orderFrontRegardless() NSApp.activateIgnoringOtherApps_(True) return -- Valentino Volonghi aka Dialtone Now Running MacOSX 10.6 http://www.adroll.com/

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