Re: how to pickle unpicklable objects
Guy Lateur schrieb:
> Hi all,
>
> I've been writing an application containing a lot of settings which can be
> changed by the user. I'm using wx.Config to read/write these settings (to
> the windows registry). This means I can only store strings, ints and floats.
>
> However, it would be very convenient if I could also store more general
> objects. It seems to work for wx.Colour, but not for wx.Font. It raises a
> "TypeError: can't pickle PySwigObject objects".
The object is wrapped by SWIG. So, python can not know anything about it
and the object can not be pickled.
As far as I see, there are two possibilities
- define __getstate__ and __setstate__ in the c/c++-source or the .i
file (used by swig). This is only possible if the source is available
- use copy_reg (http://docs.python.org/lib/module-copyreg.html) to
register a 'reduce' function (I never used that).
I use the first option in the .i-File for a wrapped c++-class like this:
%extend UMDMResult {
%insert("python") %{
def __getstate__(self):
return (self.v,self.u,self.l,self.unit,self.Z0,self.Eta0,self.t)
def __setstate__(self,tup):
self.this = _umddevice.new_UMDMResult(tup[0],tup[1],tup[2],tup[3])
self.thisown=1
(self.Z0,self.Eta0,self.t)=[i for i in tup[4:]]
%}
}
regards
Hans Georg Krauthaeuser
--
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searching python/gui developper in germany
Dear all, for the measurements in our labs we have developed python scripts that are pretty fine for our needs. Basically, we have classes and call the appropriate methods from the command line (or by other scripts). So, we don't have any GUI. Now, an external customer want to use our software and -- as you can imagine -- we want a pretty GUI. So, we are looking for someone who can develop such a pretty GUI for us (of course for money). OS is Windows (XP). We are not fixed to a special toolkit -- it just should look nice and do the job. Best would be someone from our region (Magdeburg, Germany). If someone is interested: contact me by email, please. Best regards Hans Georg Krauthaeuser -- http://mail.python.org/mailman/listinfo/python-list
Re: searching python/gui developper in germany
malv schrieb: > Hans Georg Krauthaeuser wrote: > >>Dear all, >> >>for the measurements in our labs we have developed python scripts that >>are pretty fine for our needs. Basically, we have classes and call the >>appropriate methods from the command line (or by other scripts). So, we >>don't have any GUI. >> >>Now, an external customer want to use our software and -- as you can >>imagine -- we want a pretty GUI. >> >>So, we are looking for someone who can develop such a pretty GUI for us >>(of course for money). OS is Windows (XP). We are not fixed to a special >>toolkit -- it just should look nice and do the job. >> >>Best would be someone from our region (Magdeburg, Germany). >> >>If someone is interested: contact me by email, please. >> >>Best regards >>Hans Georg Krauthaeuser > > http://www.die-offenbachs.de/detlev/eric3.html > If you run SuSE9.3 or SuSE 10.0, everything is there. Simply install > eric or eric3. > There is also a great gui design utility in the installation. > You'll be going in no time. > malv > Sorry for the question, but... Is this a bot? If not, just as a clearification: We are NOT looking for an IDE or an GUI tool. I'm sure, I can build a GUI, with eric3 or an other tool. I simply have not the time. So, we are looking for a person do do the job for us. regards Hans Georg -- http://mail.python.org/mailman/listinfo/python-list
Re: Help with cPickle for deserializing datetime.datetime instances
Mingus Tsai schrieb:
> Hello- please help with unpickling problem:
>
> I am using Python version 2.3.4 with IDLE version 1.0.3 on a Windows
> XPhome system.
>
> My problem is with using cPickle to deserialize my pickled arrays of
> datetime.datetime instances. The following is the code I have written:
>
> import cPickle, datetime
> import Numeric
>
> #the file below contains a serialized dict with arrays of datetime
> #objects. When these three statements run, the IDLE crashes!
>
> input1 = open('tsm2_outa','r')
> time1 = cPickle.load(input1)
> input1.close()
>
> #the file below contains serialized dict with arrays of built-in objects
> #it unpickles without any problem, when I omit the above unpickling
> #operation.
>
> input2 = open('tsm2_outb','rb')
> data1 = cPickle.load(input2)
> input2.close()
>
> My guess is that I need to somehow tell the pickle.load command that it
> is loading datetime instances, but I have no idea how to do this. Any
> help would be much appreciated.
>
> Thanks,
> Ming
How did you wrote the pickle-file. If you used mode 2 you have to open
the file with mode "rb", as you did for the other pickle file.
Hans
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Re: Good python reference?
derek schrieb: > Hello! I'm new to the group and am looking for a decent reference for > information about the history / evolution of the Python language and > its features. Typing, scoping, etc... I'd appreciate any good links. > Thanks! > > - Derek > Looking at the title of your mail I would answer http://rgruet.free.fr/PQR24/PQR2.4.html But history? Sorry Hans Georg -- http://mail.python.org/mailman/listinfo/python-list
platform independent kbhit()
Hey all, this is probably a FAQ, but I didn't found the answer... I use msvcrt.kbhit() to check for a user keyboard event on windows. But now, I would prefer to make the module independent from the platform used. I already know that I can use curses (on linux/unix) or Tkinter. Also, I found this http://my.execpc.com/~geezer/software/kbhit.c C source that has a kbhit() and a getch() for linux/unix that I can SWIG to python. Are there other (more simple, pure python, true platform independent) possibilities? Best regards Hans Georg Krauthaeuser -- www.uni-magdeburg.de/krauthae -- http://mail.python.org/mailman/listinfo/python-list
Re: Text To Speech with pyTTS
Mike P. wrote:
Hi,
I was wondering if anyone has had any luck with the python text to speech
(pyTTS) module available on Sourceforge:
http://sourceforge.net/projects/uncassist
I have followed the tutorial for pyTTS at:
http://www.cs.unc.edu/~parente/tech/tr02.shtml
Using the first simple speech example:
import pyTTS
tts = pyTTS.Create()
tts.Speak("Hello World!")
I get the following error on the call to pyTTS.Create()
C:\Program Files\Python23\Lib\site-packages\pyTTS>python
ActivePython 2.3.2 Build 232 (ActiveState Corp.) based on
Python 2.3.2 (#49, Nov 13 2003, 10:34:54) [MSC v.1200 32 bit (Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
import pyTTS
tts = pyTTS.Create()
Traceback (most recent call last):
File "", line 1, in ?
File "C:\Program Files\Python23\Lib\site-packages\pyTTS\__init__.py", line
28, in Create
raise ValueError('"%s" not supported' % api)
ValueError: "SAPI" not supported
...
The TTSFast.py file is missing in the 2.3 distribution. I made a copy
from the 2.4 dist and everything worked fine for me.
Hans Georg
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Re: Text To Speech with pyTTS
Peter wrote: I released a new version of the Windows installer for Python 2.3 that includes the missing _TTSFast.pyd file. Unfortunenately, the file TTSFast.py is missing, not _TTSFast.pyd. Hans Georg -- http://mail.python.org/mailman/listinfo/python-list
Re: Newbie Tkinter Question
Peter Otten schrieb: > Pseud O'Nym wrote: > > >>the following fragment doesn't cause any errors and results in buttons the >>correct size for the images, but the buttons don't work, and the images >>aren't displayed. If I add a text property, and remove the images, they >>work fine, so the rest of my code's OK. I've searched this group and >>Python.org to no avail. >> >>class App: >> def __init__(self, master): >>frame = Frame(master) >>frame.pack(side=LEFT, fill=Y) >>image1 = PhotoImage(file='button_a.gif') >>self.button = Button(frame, image=image1) >>self.button.pack(side=TOP) > > > self.image = image1 > > >>Can anyone enlighten me? > > > For reasons that are beyond me widgets do not increase the reference count > of a PhotoImage. Therefore you have to put a reference to the image > elsewhere, e. g. into the App instance, to prevent it from being > garbage-collected when the image1 variable goes out of scope. > > Peter > Because I stumbled across the same 'feature' just recently, I think it's good to give a reference... >From http://tkinter.unpythonic.net/wiki/Images "Something that seems to bite every new Tkinter programmer at least once: you've loaded a PhotoImage, applied it to a Button, Label, or other widget, and nothing shows up - because you referenced the image only via a local variable, so it went out of scope and got deleted before the widget ever appeared. The usual solution is to store a reference to the image as an attribute of the widget that is to display it. You might just call this a bug in Tkinter, but the reality isn't quite that simple... Tk images are not first-class objects: when you apply one to a widget, you do not in any sense "pass a reference to" the image. Instead, you just pass a name, which Tk looks up in an internal table of defined images (from which images can only be deleted manually). From Tkinter, passing a PhotoImage as a parameter actually only sends the str() of the image object to the Tcl side: this is just a string, the randomly-generated name assigned when the object was created. "No reference to the image itself" means "no reference counting" means "no way for the Python side to be notified when the image is truly no longer used". If Tkinter didn't delete images when no Python reference to them existed, they would be unavoidable memory leaks. ..." Hans Georg -- http://mail.python.org/mailman/listinfo/python-list
scipy.stats.itemfreq: overflow with add.reduce
Hi All, I was playing with scipy.stats.itemfreq when I observed the following overflow: In [119]:for i in [254,255,256,257,258]: .:l=[0]*i .:print i, stats.itemfreq(l), l.count(0) .: 254 [ [ 0 254]] 254 255 [ [ 0 255]] 255 256 [ [0 0]] 256 257 [ [0 1]] 257 258 [ [0 2]] 258 itemfreq is pretty small (in stats.py): -- def itemfreq(a): """ Returns a 2D array of item frequencies. Column 1 contains item values, column 2 contains their respective counts. Assumes a 1D array is passed. Returns: a 2D frequency table (col [0:n-1]=scores, col n=frequencies) """ scores = _support.unique(a) scores = sort(scores) freq = zeros(len(scores)) for i in range(len(scores)): freq[i] = add.reduce(equal(a,scores[i])) return array(_support.abut(scores, freq)) -- It seems that add.reduce is the source for the overflow: In [116]:from scipy import * In [117]:for i in [254,255,256,257,258]: .:l=[0]*i .:print i, add.reduce(equal(l,0)) .: 254 254 255 255 256 0 257 1 258 2 Is there any possibility to avoid the overflow? BTW: Python 2.3.5 (#2, Aug 30 2005, 15:50:26) [GCC 4.0.2 20050821 (prerelease) (Debian 4.0.1-6)] on linux2 scipy_version.scipy_version --> '0.3.2' Thanks and best regards Hans Georg Krauthäuser -- http://mail.python.org/mailman/listinfo/python-list
Re: scipy.stats.itemfreq: overflow with add.reduce
Hans Georg Krauthaeuser schrieb: > Hi All, > > I was playing with scipy.stats.itemfreq when I observed the following > overflow: > > In [119]:for i in [254,255,256,257,258]: >.:l=[0]*i >.:print i, stats.itemfreq(l), l.count(0) >.: > 254 [ [ 0 254]] 254 > 255 [ [ 0 255]] 255 > 256 [ [0 0]] 256 > 257 [ [0 1]] 257 > 258 [ [0 2]] 258 > > itemfreq is pretty small (in stats.py): > > -- > def itemfreq(a): > """ > Returns a 2D array of item frequencies. Column 1 contains item values, > column 2 contains their respective counts. Assumes a 1D array is passed. > > Returns: a 2D frequency table (col [0:n-1]=scores, col n=frequencies) > """ > scores = _support.unique(a) > scores = sort(scores) > freq = zeros(len(scores)) > for i in range(len(scores)): > freq[i] = add.reduce(equal(a,scores[i])) > return array(_support.abut(scores, freq)) > -- > > It seems that add.reduce is the source for the overflow: > > In [116]:from scipy import * > > In [117]:for i in [254,255,256,257,258]: >.:l=[0]*i >.:print i, add.reduce(equal(l,0)) >.: > 254 254 > 255 255 > 256 0 > 257 1 > 258 2 > > Is there any possibility to avoid the overflow? > > BTW: > Python 2.3.5 (#2, Aug 30 2005, 15:50:26) > [GCC 4.0.2 20050821 (prerelease) (Debian 4.0.1-6)] on linux2 > > scipy_version.scipy_version --> '0.3.2' > > > Thanks and best regards > Hans Georg Krauthäuser After some further investigation: In [150]:add.reduce(array(equal([0]*256,0),typecode='l')) Out[150]:256 In [151]:add.reduce(equal([0]*256,0)) Out[151]:0 The problem occurs with arrays with typecode 'b' (as returned by equal). Workaround patch for itemfreq is obvious, but ... is it a bug or a feature? regards Hans Georg -- http://mail.python.org/mailman/listinfo/python-list
Re: scipy.stats.itemfreq: overflow with add.reduce
Hans Georg Krauthaeuser schrieb: > Hans Georg Krauthaeuser schrieb: > >> Hi All, >> >> I was playing with scipy.stats.itemfreq when I observed the following >> overflow: >> >> In [119]:for i in [254,255,256,257,258]: >>.:l=[0]*i >>.:print i, stats.itemfreq(l), l.count(0) >>.: >> 254 [ [ 0 254]] 254 >> 255 [ [ 0 255]] 255 >> 256 [ [0 0]] 256 >> 257 [ [0 1]] 257 >> 258 [ [0 2]] 258 >> >> itemfreq is pretty small (in stats.py): >> >> -- >> def itemfreq(a): >> """ >> Returns a 2D array of item frequencies. Column 1 contains item values, >> column 2 contains their respective counts. Assumes a 1D array is passed. >> >> Returns: a 2D frequency table (col [0:n-1]=scores, col n=frequencies) >> """ >> scores = _support.unique(a) >> scores = sort(scores) >> freq = zeros(len(scores)) >> for i in range(len(scores)): >> freq[i] = add.reduce(equal(a,scores[i])) >> return array(_support.abut(scores, freq)) >> -- >> >> It seems that add.reduce is the source for the overflow: >> >> In [116]:from scipy import * >> >> In [117]:for i in [254,255,256,257,258]: >>.:l=[0]*i >>.:print i, add.reduce(equal(l,0)) >>.: >> 254 254 >> 255 255 >> 256 0 >> 257 1 >> 258 2 >> >> Is there any possibility to avoid the overflow? >> >> BTW: >> Python 2.3.5 (#2, Aug 30 2005, 15:50:26) >> [GCC 4.0.2 20050821 (prerelease) (Debian 4.0.1-6)] on linux2 >> >> scipy_version.scipy_version --> '0.3.2' >> >> >> Thanks and best regards >> Hans Georg Krauthäuser > > After some further investigation: > > In [150]:add.reduce(array(equal([0]*256,0),typecode='l')) > Out[150]:256 > > In [151]:add.reduce(equal([0]*256,0)) > Out[151]:0 > > The problem occurs with arrays with typecode 'b' (as returned by equal). > > Workaround patch for itemfreq is obvious, but ... is it a bug or a feature? > > regards > Hans Georg I feel a bit lonely here, but, nevertheless a further remark: The problem comes directly from the ufunc 'add' for typecode 'b'. In contrast to 'multiply' the typecode is not 'upcasted': In [178]:array(array([1],'b')*2) Out[178]:array([2],'i') In [179]:array(array([1],'b')+array([1],'b')) Out[179]:array([2],'b') So, for a array a with typecode 'b' it follows that a+a != a*2 At the moment, I don't have the time to try the new scipy_core. It would be nice to hear whether the problem is known or even already fixed!? Regards Hans Georg Krauthäuser -- http://mail.python.org/mailman/listinfo/python-list
Re: [OT] no goto (WAS: Python code written in 1998...)
Steven Bethard schrieb: > Carl Cerecke wrote: > >> Python has no goto. > > > Not in the standard library. You have to download the module: > http://www.entrian.com/goto/ > > ;) > > STeVe This remerbers me to VATICAL, a famous programming language from the 80s. http://www.uni-weimar.de/~mildenbe/spass/vatical/vatical.html It's in German only and I'm not aware of a English translation. Please be aware that content of that page is not political correct and may offend your religious sensibilities. Hans Georg -- http://mail.python.org/mailman/listinfo/python-list
Re: Is it possible to save a running program and reload next time ?
[EMAIL PROTECTED] wrote: > > Can objects be saved and reloaded by "Pickle" ? I have tried but no > success. > Yes, that's the intended use of pickle/cPickle. There are examples in the docs: http://docs.python.org/lib/module-pickle.html What have you tried and what didn't work? Hans Georg -- http://mail.python.org/mailman/listinfo/python-list
Re: Is it possible to save a running program and reload next time ?
[EMAIL PROTECTED] wrote: > Hans Georg Krauthaeuser wrote: >> [EMAIL PROTECTED] wrote: >> >>> Can objects be saved and reloaded by "Pickle" ? I have tried but no >>> success. >>> >>> >> Yes, that's the intended use of pickle/cPickle. There are examples in >> the docs: >> >> http://docs.python.org/lib/module-pickle.html >> >> What have you tried and what didn't work? >> >> Hans Georg >> > My program is a genetic algorithm based program, so I thought I just > need to save a generation object of the population and reload it later > then my program could continue. But after I saved a generation object > from within python using cPickle and reload it from another program, it > said that some class object couldn't be found. Now I realized that a > program cannot be suspended and reloaded by just simply dumping and > loading using cPickle/Pickle. > > I will try stackless python later. > > Thanks a lot . > > Regards, > > xiaojf > I use pickle to periodically save measured data for measurements that take several days to finish. Actually, I save a class instance with the data, the measurement methods and additional informations what method was called and with what parameters. If the measurement crashes due to some reasons, I recreate the class instance from the pickle file, call the appropriate method with the saved parameters. Then, the method has to look what data is already there and will continue to measure the rest. I have no idea whether that will help you in your situation. Anyway, I wish you all the best. Hans Georg -- http://mail.python.org/mailman/listinfo/python-list
Re: RPy / R
jason schrieb:
> Hello:
>
> I installed the following:
>
> python-2.4.2.msi
> pywin32-207.win32-py2.4.exe
> R-2.2.1-win32.exe
> rpy-0.4.6-R-2.0.0-to-2.2.1-py24.win32.exe
>
> on a Windows XP (SP2) box.
>
> When I try to run the following (source:
> http://rpy.sourceforge.net/plotting-with-RPy.html) in IDLE
>
from rpy import *
x = range(0, 10)
y = [ 2*i for i in x ]
r.plot_default(x, y)
Jason,
the example runs here without problems.
My configuration:
Python 2.3.5 (#2, Aug 30 2005, 15:50:26)
[GCC 4.0.2 20050821 (prerelease) (Debian 4.0.1-6)] on linux2
Type "copyright", "credits" or "license()" for more information.
>>> r.version
{'status': '', 'major': '2', 'language': 'R', 'os': 'linux-gnu', 'svn
rev': '36812', 'system': 'i486, linux-gnu', 'month': '12', 'platform':
'i486-pc-linux-gnu', 'year': '2005', 'arch': 'i486', 'day': '20',
'minor': '2.1'}
Seems to be a problem with your installation...
Hans Georg
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Re: pickling multiple dictionaries
manstey wrote:
> Hi,
>
> I am running a script that produces about 450,000 dictionaries. I tried
> putting them into a tuple and then pickling the tuple, but the tuple
> gets too big. Can I pickle dictionaries one after another into the same
> file and then read them out again?
>
> Cheers,
> Matthew
>
If you don't know, just try it:
In [1]:import pickle
In [2]:d1={'a':1}
In [3]:d2={'b':2}
In [4]:pfile=file('test.p','wb')
In [5]:pickle.dump(d1,pfile)
In [6]:pickle.dump(d2,pfile)
In [7]:pfile.close()
In [8]:del d1
In [9]:del d2
In [10]:pfile=file('test.p','rb')
In [11]:d1=pickle.load(pfile)
In [12]:d1
Out[12]:{'a': 1}
In [13]:d2=pickle.load(pfile)
In [14]:d2
Out[14]:{'b': 2}
If your data is *really* large, have a look to PyTables
(http://www.pytables.org/moin).
Regards,
Hans Georg
--
http://mail.python.org/mailman/listinfo/python-list
Re: FIR filtering
LabWINC wrote: > Hi all, > i'm looking for a module to implement a digital FIR filter! > Can anyone help me? > > Thanks, > > Vincent > gnuradio? Hans Georg -- http://mail.python.org/mailman/listinfo/python-list
Re: FIR filtering
LabWINC wrote: > What's gnuradio? > http://www.gnu.org/software/gnuradio/ It's a c++ lib with a python wrapper. BTW, thats the first hit in google ... Hans Georg -- http://mail.python.org/mailman/listinfo/python-list
Re: FIR filtering
LabWINC wrote: > I can't understand how gnuradio can help me... > I find scipy is the only way to implement a good FIR. Well, then do it with scipy... gnuradio has a module for FIR. I never used it. I just wanted to share that information. Hans Georg -- http://mail.python.org/mailman/listinfo/python-list
Re: How to determine if a line of python code is a continuation of the line above it
Sandra-24 wrote: > I'm not sure how complex this is, I've been brainstorming a little, and > I've come up with: > > If the previous line ended with a comma or a \ (before an optional > comment) > > That's easy to cover with a regex > > But that doesn't cover everything, because this is legal: > > l = [ > 1, > 2, > 3 > ] > > and with dictionaries and tuples as well. > > Not sure how I would check for that programmatically yet. > > Is there any others I'm missing? > > Thanks, > -Sandra > Sandra, in a similar situation I used 'inspect' and 'compile' like so: import inspect def func(*arg, **kwarg): return get_cmd() def get_cmd(): frame = inspect.currentframe() outerframes = inspect.getouterframes(frame) caller = outerframes[1][0] ccframe = outerframes[2][0] ccfname = outerframes[2][1] ccmodule = inspect.getmodule(ccframe) slines, start = inspect.getsourcelines(ccmodule) clen = len(slines) finfo = inspect.getframeinfo(ccframe, clen) theindex = finfo[4] lines = finfo[3] theline = lines[theindex] cmd = theline for i in range(theindex-1, 0, -1): line = lines[i] try: compile (cmd.lstrip(), '', 'exec') except SyntaxError: cmd = line + cmd else: break return cmd if __name__ == '__main__': a=0 b="test" c=42 cmd=func(a) print cmd cmd=func(a, b, c) print cmd output: cmd=func(a) cmd=func(a, b, c) Regards Hans Georg -- http://mail.python.org/mailman/listinfo/python-list
