🌐 Mailman 3 June 2009 - Python-list - python.org

Re: what is the biggest number that i can send to Wave_write.writeframes(data)
by Rob Williscroft June 4, 2009

June 4, 2009

'2+ wrote in news:mailman.1017.1243932401.8015.python-list@python.org in comp.lang.python: > would like to take advantage of the wave module > found a good example here: > http://www.python-forum.org/pythonforum/viewtopic.php?f=2&t=10644 > > hmm .. i don't get how to write a stereo .. i mean i can set nchannels > .. but how do i actually take control of each ch individually? Interleave the channels, one sample for the left then one sample for the right (or maybe its the other way around). > and what's the range(in float) of the data i can set in The range of a signed 16 bit int, -2**15 to 2**15 - 1. > wav_file.writeframes(struct.pack('h', data))? Example: import wave from StringIO import StringIO out = StringIO() AMPLITUDE = 2 ** 15 w = wave.open( out, "w" ) w.setnchannels( 2 ) w.setsampwidth( 2 ) #BYTES w.setframerate( 22000 ) from array import array import math F = 261.626 F2 = F * (2 ** (5 / 12.)) ang = 0.0 ang2 = 0.0 delta = ( math.pi * 2 * F ) / 22000.0 delta2 = ( math.pi * 2 * F2 ) / 22000.0 for cycle in xrange( 4 ): data = array( 'h' ) for pos in xrange( 22000 ): amp = AMPLITUDE * (pos / 22000.0) amp2 = AMPLITUDE - amp if cycle & 1: amp, amp2 = amp2, amp data.append( int( ( amp * math.sin( ang ) ) ) ) data.append( int( ( amp2 * math.sin( ang2 ) ) ) ) ang += delta ang2 += delta2 w.writeframes( data.tostring() ) w.close() sample = out.getvalue() out.close() #a wx player import wx app = wx.PySimpleApp() class Frame( wx.Dialog ): def __init__( self, *args ): wx.Dialog.__init__( self, *args ) b = wx.Button( self, -1, "Ok" ) b.Bind( wx.EVT_BUTTON, self.button ) def button( self, event ): self.sound = wx.SoundFromData( sample ) self.sound.Play( wx.SOUND_ASYNC ) frame = Frame( None ) frame.Show() app.MainLoop() Rob. -- http://www.victim-prime.dsl.pipex.com/

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Re: Using C++ and ctypes together: a vast conspiracy? ;)
by Thomas Heller June 4, 2009

June 4, 2009

Joseph Garvin schrieb: > So I was curious whether it's possible to use the ctypes module with > C++ and if so how difficult it is. There have been some attempts to use ctypes to access C++ objects. We (Roman Yakovenko and myself) made some progress. We were able to handle C++ name mangling, the special C++ calling convention, access virtual, non-virtual, overloaded functions, but finally gave up because the binary layout (function tables, member variables, and so on) of C++ objects is way too complicated and undocumented. Our attempts are documented in posts to the ctypes-users mailing list, most of them have the word 'cpptypes' in the subject line. Thomas

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Re: OT: Can;'t find a Mozilla user group
by News123 June 4, 2009

June 4, 2009

Anthra Norell wrote: > I can't run Firefox and Thunderbird without getting these upgrade > ordering windows. I don't touch them, because I have reason to suspect > that they are some (Russian) virus that hijacks my traffic. Occasionally > one of these window pops up the very moment I hit a key and next a > confirmation message appears "reassuring" me that the upgrade will be > installed the next time I start. I meant to ask Mozilla about their > upgrade policy and facilities but for all the googling I do I can't find > a contact address, nor an active user group. Hints will be greatly > appreciated. Thanks! > > Frederic > I don't know a Mozilla news group, but in Settings Advanced -> Settings -> Updates you can choose if updats will be installed automatically or if you want to be asked. Additionally you could check your SW version in the Help->About Menu and then go to the Firefox / Thunderbird web site and look at which version they are? So you know at least whether there is a pending update

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Re: how to get rid of pyc files ?
by pythoncurious＠gmail.com June 4, 2009

June 4, 2009

On May 25, 12:08 am, Dave Angel <da...(a)ieee.org> wrote: > > Is Clearcase still around? I hope it works better than it did in 1992. > I don't know how it worked back then, but if it's worse than today, I don't know how they ever managed to get people to use it. I'm not a fan and I don't have a choice about using it :) > Somebody else has already pointed out that you can tell Python not to > create thosefiles(during your development stages). > Yes, that's probably the best way to sort out the problems. It would of course be nice if python could detect that these files aren't usable and just regenerate them. I realise it might not be a trivial feature to implement though. > > Perhaps Clearcase supports some form of "exclusion" parameter, wherein > you say not to do version control onfileswith certain patterns, like .pyc They're not actually version controlled, but "view private" as someone described. This means I'll see them whenever I'm using the view they were created in.

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Re: import sqlite3
by willgun June 4, 2009

June 4, 2009

Gabriel Genellina 写道: > En Thu, 04 Jun 2009 02:15:39 -0300, willgun <willgun(a)live.cn> escribió: > >> Traceback (most recent call last): >> File "C:\Users\hp\Desktop\SQLite3\sqlite3.py", line 2, in <module> >> import sqlite3 >> File "C:\Users\hp\Desktop\SQLite3\sqlite3.py", line 3, in <module> >> con=sqlite3.connect(r'g:\db1') >> AttributeError: 'module' object has no attribute 'connect' >> >> Anyone can tell me why? > > Your own script is named sqlite3, right? When you execute "import > sqlite3" you end up importing your own script, not the library module... > Thanks,I am quiet surprised to be applied so soon.

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import sqlite3
by willgun June 4, 2009

June 4, 2009

Hi,everyone! When i run the following in IDLE: IDLE 2.6.1 >>> import sqlite3 >>> con =sqlite3.connect (r'g:\db1') >>> everything goes well,but when i save these to a .py file and run it: >>> Traceback (most recent call last): File "C:\Users\hp\Desktop\SQLite3\sqlite3.py", line 2, in <module> import sqlite3 File "C:\Users\hp\Desktop\SQLite3\sqlite3.py", line 3, in <module> con=sqlite3.connect(r'g:\db1') AttributeError: 'module' object has no attribute 'connect' Anyone can tell me why? Thanks first!

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Re: Project source code layout?
by Lawrence D'Oliveiro June 4, 2009

June 4, 2009

In message <mailman.1073.1244055678.8015.python-list(a)python.org>, Allen Fowler wrote: > I'm new to Python, and am looking for some suggestions as to the source > code layout for a new project. Is this the development layout or the deployment layout? The two need not bear any resemblance.

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OT: Can;'t find a Mozilla user group
by Anthra Norell June 4, 2009

June 4, 2009

I can't run Firefox and Thunderbird without getting these upgrade ordering windows. I don't touch them, because I have reason to suspect that they are some (Russian) virus that hijacks my traffic. Occasionally one of these window pops up the very moment I hit a key and next a confirmation message appears "reassuring" me that the upgrade will be installed the next time I start. I meant to ask Mozilla about their upgrade policy and facilities but for all the googling I do I can't find a contact address, nor an active user group. Hints will be greatly appreciated. Thanks! Frederic

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Re: easiest way to plot x,y graphically during run-time?
by Scott David Daniels June 4, 2009

June 4, 2009

Esmail wrote: > ... Tk seems a bit more complex .. but I really don't know much about > it and its interface with Python to make any sort of judgments as > to which option would be better. This should look pretty easy: import Tkinter as tk class Mover(object): def __init__(self, canvas, tag_or_id): self.canvas = canvas self.ident = tag_or_id self.x = self.y = 0 def start(self, event): self.x = event.x self.y = event.y def move(self, event): if event.x != self.x or event.y != self.y: dx = event.x - self.x dy = event.y - self.y self.x = event.x self.y = event.y self.canvas.move(self.ident, dx, dy) def setup(root=None): if root is None: root = tk.Tk() root.geometry('400x400+5+5') # experiment: -- place and size canvas = tk.Canvas(root) canvas.pack(expand=1, fill=tk.BOTH) # ovals are x1, y1, x2, y2 a = canvas.create_oval((50, 100, 70, 140), fill='red') b = canvas.create_oval((100, 200, 140, 290), fill='blue') c = canvas.create_oval((300, 300, 390, 330), fill='green') canvas.itemconfig(a, fill='#55AADD') # using internet colors canvas.move(a, 5, 5) # move a down right 5 pixels mover = [Mover(canvas, ident) for ident in (a, b, c)] canvas.bind("<B1-Motion>", mover[0].move) canvas.bind("<Button-1>", mover[0].start) canvas.bind("<B2-Motion>", mover[1].move) canvas.bind("<Button-2>", mover[1].start) canvas.bind("<B3-Motion>", mover[2].move) canvas.bind("<Button-3>", mover[2].start) return canvas, mover if __name__ == '__main__': c, m = setup() tk.mainloop() If you want to experiment, use something like: python -m idlelib.idle -n or $ python <wherever python is>/Lib/idlelib/idle.py -n or C:\> C:\Python25\python C:\Python25\Lib\idlelib\idle.py -n To get an idle window with the -n switch on (so you are using the idle "in-process") to see the effects of each Tkinter operation as you go. You can then run these operations in place, seeing results and effects. --Scott David Daniels Scott.Daniels(a)Acm.Org

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Re: Absolute imports in Python 2.4
by Steven D'Aprano June 4, 2009

June 4, 2009

On Tue, 02 Jun 2009 02:37:04 -0300, Gabriel Genellina wrote: > En Mon, 01 Jun 2009 21:40:26 -0300, Steven D'Aprano > <steve(a)remove-this-cybersource.com.au> escribió: > >> I have a package which includes a module which shadows a module in the >> standard library. For example: >> >> package >> +-- __init__.py >> +-- ham.py >> +-- spam.py >> +-- sys.py >> >> Inside that package, I want to import the standard library sys. In >> other words, I want an absolute import. [...] What can I do in Python >> 2.4 to get an absolute import? > > sys = __import__("sys", {}) > > The import statement uses the global namespace to determine which > package it is called on; if you pass an empty namespace, it cannot infer > package information. Oh that's very cunning! Nice trick. > Anyway, the best move would be to rename the offending module... I agree. But it's nice to know the work-around if I need it. -- Steven

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