🌐 Mailman 3 December 2003 - Python-list - python.org

Sun audio blocks, even when run in a thread
by Bruce.Bon＠SubaruTelescope.org Dec. 1, 2003

Dec. 1, 2003

The class below is intended to play a Sun audio file (.au) in the background while the main thread, which is servicing a GUI, continues without impact. It doesn't work. For a sound file that takes 3-5 seconds to play, the main thread hangs for that long. I have run this many times, with changes in printouts and insertion of strategic sleeps to try to make sure that the player thread gives up control, but apparently the call to audioObj.write( audioString ) is atomic -- NOTHING happens in the main thread until it returns. I have tested this with print statements and sleeps in the main thread instead of a GUI, and you can see the program's output simply halt while the sound is audible. I have also looked for delays at dataLock.acquire() and not found any. Help, suggestions, explanation or work-around?? Thanks. Bruce Bon _______________________________ import time import sunaudiodev from thread import * class AudioPlayer: def __init__( self, owner ): '''Constructor.''' self.soundQueue = [] self.terminateFlag = False self.dataLock = allocate_lock() print 'AudioPlayer: starting playerThread...' print ' main thread ID = ', get_ident() self.playerThread = start_new_thread( self.__playerThread, () ) def playAudio( self, audio ): self.dataLock.acquire() self.soundQueue.append( audio ) # put to end of list self.dataLock.release() def terminate( self ): self.dataLock.acquire() self.terminateFlag = True self.dataLock.release() time.sleep(1) def __playerThread( self ): '''Function to be executed in background thread, to play sounds.''' print '__playerThread() starting: ID = ', get_ident() while True: # Check terminateFlag and soundQueue audio = None self.dataLock.acquire() if self.terminateFlag: self.dataLock.release() print '__playerThread(): terminating playerThread...' exit() l = len(self.soundQueue) if l > 0: audio = self.soundQueue.pop(0) # get from beginning of list self.dataLock.release() if audio == None: time.sleep( 1.0 ) # poll queue 1/second else: # Read the .au file auReadObj = open( audio, 'r' ) audioString = auReadObj.read() auReadObj.close() # Open the audio device and play the sound try: audioObj = sunaudiodev.open('w') except sunaudiodev.error: print 'ERROR __playerThread: ' + \ 'Failed to open Sun audio device.' else: audioObj.write( audioString ) audioObj.close()

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Re: notes on compilation Python with MinGW gcc
by Ames Andreas (MPA/DF) Dec. 1, 2003

Dec. 1, 2003

Hi Oleg, usenet(a)xmlhack.ru (Oleg A. Paraschenko) writes: > recently I compiled Python with MinGW gcc under Windows. > If there are some interest, you can look at log of process at > > http://uucode.com/texts/python-mingw/python-mingw.html > > In short, about compiling with MinGW gcc: > > * it is possible; > * result works; > * you must not do it unless you know for sure that you must do it; > * you must have a good knowledge of C and of debugging; > * in most cases all you need is to compile an extension module. I've recently taken a slitely different way to accomplish a native mingw32 build. You can get a patch from https://sourceforge.net/tracker/?func=detail&aid=841454&group_id=5470&at id=305470 As I haven't used msys yet and my real goal was to build a mingw32-python on linux (without the adventures of installing VC6 under wine, which reportedly works either). Thus it had to be a crosscompile, but you should be able to use cygwin (but you must edit xbuild-py.sh to do so and you must --build and --host on cygwin too, I've started the crossbuild on cygwin). The build still has quite a few 'rough edges' ;-): 1) The resource files (*.rc) are not yet compiled/linked in. Given that they are rather simple I wouldn't expect significant difficulties using windres. There would need to happen some changes to Makefile.pre.in though. 2) pythonw.exe is not yet built. Similar changes as above needed. 3) I couldn't yet convince scons that it would be a good idea to have a build directory seperate from the source tree. I have tried both the BuildDir function and the build_dir parameter to the SConscrript function but to no avail. It could either be a bug in scons or my own inability. As this was my first scons-script, I guess it's the latter. Some scons knowledgeable person might be able to fix this within seconds. Before you get a useful environment you must copy the Lib/ subdirectory from source- to the buildtree as well as all the *.pyd files from <source>/Modules and <source>/PC to <build>/DLLs or something. Note that running the testcases from a samba-share isn't good because the tests use filenames with an '@' sign which samba doesn't seem to like. You might be better off copying the complete buildtree to a native windows partition (if you build from linux anyway). The patch applies to 2.3.2 because I have no easy way to access the cvs repository. If there was interest in a native mingw32-python I would like to help to solve the above issues (and others I haven't found yet). But it doesn't appear that there is much interest in this, so I'd guess you can take the above as a toy project. cheers, andreas

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PySqlite client_encoding, stores fine but queries don't return unicode
by Irmen de Jong Dec. 1, 2003

Dec. 1, 2003

Hello I'm having some troubles with PySqlite (0.4.3, windows/linux). I want to store unicode strings in the database. So I open a connection with the client_encoding="UTF-8" parameter. When I store a unicode string in a table, it seems to work fine. (a sqlite .dump shows that it encoded the unicode string to UTF-8). But the problem is that a *query* from the same table, doesn't return the string contents as a unicode string! Rather, it returns a normal string that still contains the UTF-8 encoded bytes... Is there any way to make pysqlite decode the UTF-8 strings and return unicode strings automatically ? Thanks! -Irmen de Jong

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Re: compile(unicode) & source encoding
by martin＠v.loewis.de Dec. 1, 2003

Dec. 1, 2003

"Denis S. Otkidach" <ods(a)strana.ru> writes: > Why we have to choose one particular encoding and not just assume > all strings to be unicode? Assume the source code reads source = u""" f=open("/etc/passwd","a") f.write("news:x:9:13:News system:/etc/news:/bin/bash\n") """ What data type should the argument of f.write have, in this example? If the answer is not <type 'str'>, you would cause many compatibility problems. > Surely. But there is no way to emulate "python -U" behavior for > compiled piece of code. However, python -U does not currently work. When it does, exposing it separately to compile() might be reasonable. OTOH, the current behaviour might be sufficient: If -U is passed, strings created in compile would automatically be Unicode strings - which is the case today. Regards, Martin

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notes on compilation Python with MinGW gcc
by usenet＠xmlhack.ru Dec. 1, 2003

Dec. 1, 2003

Hello all, recently I compiled Python with MinGW gcc under Windows. If there are some interest, you can look at log of process at http://uucode.com/texts/python-mingw/python-mingw.html In short, about compiling with MinGW gcc: * it is possible; * result works; * you must not do it unless you know for sure that you must do it; * you must have a good knowledge of C and of debugging; * in most cases all you need is to compile an extension module. -- Oleg

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tkFileDialog.askdirectory
by Ax10＠gmx.de Dec. 1, 2003

Dec. 1, 2003

Hello i have a Linux Mandrake Distribution with Python 2.3 and Tcl/Tk 8.4. Python 2.2 and Tcl/Tk 8.3.3 returns an String if i made this: x = tkFileDialog.askdirectory(initialdir="was auch immer", title="xxx") print type(x) <type 'str'> With the combination Python 2.3 and Tcl/Tk 8.4 it returns <type '_tkinter.Tcl_Obj'> I have asked an other user (he used Windows 2000 Python 2.3.2 Tcl/Tk 8.4) and it returns an string. Is the Python version the reason or what goes wrong, or is it a new feature? Mike

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Re: help with soap, please (java axis)
by Alan Kennedy Dec. 1, 2003

Dec. 1, 2003

[Yurj] > but I receive a: > > SOAPpy.Types.faultType: <Fault soapenv:Server.userException: > org.xml.sax.SAXException: No deserializer defined for array type > {http://www.w3.org/1999/XMLSchema}list: I don't have time to answer this in detail, but I do have one suggestion: That error looks like it's coming from Axis (from the "org.xml.sax.SAXException"). Looking through my Axis config file, I see no mention of the namespace you mentioned, namely http://www.w3.org/1999/XMLSchema However, the 2001 schema is listed in the axis config file (webapps/axis/WEB-INF/server-config.wsdd). http://www.w3.org/2001/XMLSchema If I'm right that this is the cause of the error, you have two options to resolve the problem 1. Make SOAPpy generate calls in the 2001/XMLSchema namespace. 2. Configure Axis to have a deserializer for the 1999/XMLSchema namespace. Sorry, don't have time to help with either option right now. HTH, -- alan kennedy ----------------------------------------------------- check http headers here: http://xhaus.com/headers email alan: http://xhaus.com/mailto/alan

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RE: Python for web ?
by Robert Brewer Dec. 1, 2003

Dec. 1, 2003

Jay O'Connor wrote: > Your name is famailiar, does "IWETHEY" ring a bell? Gah! I sent you a glowing email about that a month ago (see below)! :) Figured you were mad at us or something. C'mon back and say "hi" sometime. I'm sure Scott would love to see you on again. http://www.iwethey.org/forums Sent 10/29 to your cybermesa account: > Wait, you mean THE JAY O'CONNOR? :) Fancy meeting you here. > This is ol' T.S. Eliot from IWETHEY ancient history--we all > miss you on the board. Good to hear from you, if so far only > in a technical capacity... ;) > > Still playin' bass? Have you seen my Pedulla? :D > http://www.aminus.org/rbre/music/index.html click on bass pics. > > Ain't Python jus' grand? Robert Brewer aka T.S. Eliot now known as FuManChu MIS Amor Ministries fumanchu(a)amor.org

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Re: Using and Implementing iterators with classes such as linked lists
by Adelein and Jeremy Dec. 1, 2003

Dec. 1, 2003

First of all, I apologize for the double posting - I thought there was some problem with the Yahoo group so I joined the main mailing list and repeated instead of waiting as I should have. Thanks for the speedy and helpful responses. I now grok the downside of using internal iterators. Now, for the external iterator, I am thinking that I would do this: class LinkedList: ... def __iter__(self): return LinkedListIterator(self.__head) class LinkedListIterator: def __init__(self, headNode): self.__current = headNode def __iter__(self): return self def next(self): if self.__current.next == None: raise StopIteration self.__current = self.__current.next return self.__current.next Of course, this LinkedListIterator is for a LinkedList that has a dummy header node, but the concept is the same in any case. I understand the concept of generators, but I do not fully comprehend all of the nuances; for that and a few other reasons, I am avoiding their use here. A few questions though: 1) I think it is best to pass only one node to the iterator, as opposed to the whole list - is that "correct"? 2) The __iter__() method is necessary in LinkedListIterator, am I correct? 3) Does this code display suitable Python idiomatic expression? For example, and in particular, is my use of '==' (as opposed to 'is not') acceptable and good from this viewpoint? Thanks again, - Jeremy __________________________________ Do you Yahoo!? Free Pop-Up Blocker - Get it now http://companion.yahoo.com/

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RE: Fast attribute/list item extraction
by Robert Brewer Dec. 1, 2003

Dec. 1, 2003

> >[Peter Otten] > >> > extract[1] > >> > extract["key"] > > > >[Robert Brewer] > >> I'm having a hard time seeing the use cases, given that I find > >> most of them more readable if done with list comprehensions > >> or good ol' for loops. > > > >Peter's post focused on implementation instead of the context. > > > >For Py2.4, the list.sort() will have an optional key > argument that encapsulates > >the decorate/sort/undercorate pattern. For example, here is > the new fastest way > >to have a case insensitive sort leaving the original case intact: > > > >>>> words = 'The quick BROWN fox JumPed OVER the LAzy dog'.split() > >>>> words.sort(key=str.lower) > Please can we have a name that better expresses the functionality? > > E.g., 'keyfunc', or 'xform' or something that says the method > is expecting > a function that will be called with the sorting argument to > produce the value > used in sorting? "key=" doesn't do it IMO. Okay, I understand better now. I didn't realize the DSU-nature of the extra sort param, or the function-nature of 'key'. I was searching/hoping for a PEP on it. Had to catch up on python-dev reading instead, which also informed me you proposed the decorator param in the first place, Raymond. ;) Given all of that, the extract() implementation looks fine. But now that I've dug through it, extract() begins to look more and more like a special case of general currying. Not sure I wouldn't rather just have curry, whether builtin, library function, or my own. Example: def printSeq(seq, extractor): for item in seq: print extractor(item), print printSeq(attrSample, rightcurry(getattr, 'y')) IMO, it's just as readable but more powerful. Robert Brewer MIS Amor Ministries fumanchu(a)amor.org

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