🌐 Mailman 3 March 2006 - Python-list - python.org

Re: Use empty string for self
by Roy Smith March 1, 2006

March 1, 2006

Terry Hancock <hancock(a)anansispaceworks.com> wrote: > However, there is a slightly less onerous method which > is perfectly legit in present Python -- just use "s" > for "self": This is being different for the sake of being different. Everybody *knows* what self means. If you write your code with s instead of self, it just makes it that much harder for other people to understand it.

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Path completion in 'raw-input'?
by Johannes Graumann March 1, 2006

March 1, 2006

When interactively asking for a path on the cmdl, I'd like to go beyond just 'raw_input' and provide shell like path completion. My research has made me believe that a combination of the cmd and glob modules is what I need, but I find the doc HIGHLY unintuitive and wasn't able to come by any examples. Does anybody have a code example for something like that lying around? There's also the rlcompleter module, but in the interest of better platform agnosis I'd like to stick with cmd ... Thanks for any hints, Joh

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Accessing 'mangled' class attrbutes
by Gerard Flanagan March 1, 2006

March 1, 2006

Hello all I would like to do the following: from elementtree.SimpleXMLWriter import XMLWriter class HtmlWriter(XMLWriter, object): def write_raw(self, text): super( HtmlWriter, self ).flush() super( HtmlWriter, self ).__write(text) but because of the name-mangling caused by '__write' I get: AttributeError: 'super' object has no attribute '_HtmlWriter__write'. Is there any simple way round this situation in general? (I just want to write out a HTML 'DOCTYPE' declaration) Thanks Gerard

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Trouble with numpy-0.9.4 and numpy-0.9.5
by drife March 1, 2006

March 1, 2006

Hello, I use the Python Numeric package extensively, and had been an avid user of the "old" scipy. In my view, both pieces of software are truly first rate, and have greatly improved my productivity in the area of scientific analysis. Thus, I was excited to make the transition to the new scipy core (numpy). Unfortunately, I am experiencing a problem that I cannot sort out. I am running Python 2.4.2 on a Debian box (V3.1), using gcc version 3.3.5, and ATLAS, BLAS, and LAPACK libraries built from scratch. When building numpy everything seems to go AOK. But trouble soon follows. As a sanity check, I run the diagnostic tests that come as part of the numpy package: from numpy import * from scipy import * test(level=N) # N can vary from 1 to 10. : No matter which test I run, Python crashes hard with only the following output: "Floating exception". I thought perhaps numpy would still work Ok, even though it seemed to have failed this "sanity" test. Thus, I tried using the numpy.linalg.eig functionality, and upon calling numpy.linalg.eig I get the same behavior: Python crashes hard with the same output "Floating exception". Can someone help me sort out what might be wrong? Perhaps I have overlooked a crucial step in the build/ install of numpy. Thanks very much, Daran

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RE: why? [win32com/WMI]
by Tim Golden March 1, 2006

March 1, 2006

[Sergey] | import win32com.client | | loc = win32com.client.Dispatch("WbemScripting.SWbemLocator") | svc = loc.ConnectServer("srv", "root/cimv2", "Admin(a)zzz.ru", "******") | sys = svc.get("Win32_Process") | sys.create("notepad.exe") | | => | | Traceback (most recent call last): | File "remote.py", line 6, in ? | sys.create("notepad.exe") | TypeError: 'int' object is not callable I could explain (it's to do with the way in which WMI method calls are set up) but I suggest you look at this module <trumpet-blowing>: http://timgolden.me.uk/python/wmi.html which makes WMI much easier to work with. Your example then becomes: <code> import wmi c = wmi.WMI (computer="srv", user="Admin(a)zzz.ru", password="****") pid, retval = c.Win32_Process.Create (CommandLine="notepad.exe") </code> TJG ________________________________________________________________________ This e-mail has been scanned for all viruses by Star. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________

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Numerical solver
by Laszlo Zsolt Nagy March 1, 2006

March 1, 2006

Hello, I would like to use a numerical solver for a specific problem. My problem looks like this: 1. I have numeric constants, named A,B,C etc. 2. I have numeric variables, named x,y,z etc. 3. I have functions, like f1(x), f2(x), f3(x,y), f4(y) etc. 4. I have constraints like f1(x) < A f3(x,y) < B etc. Fortunately, all of the variables can be limited to a closed finite interval. (E.g. 0 <= x <= 100) There is a specific function, called P(x,y,z) that needs to be optimized (need to find its maximum/minimum). I'm looking for a native Python solution: I would like to define the functions and the constraints in Python. I have looked at the cheeseshop and found LogiLab's constraint: http://www.logilab.org/projects/constraint/documentation It is almost perfect for me, but it is working with finite sets. I'm not sure about SciPy or NumPy. Do you have an idea about what is the package I need? I'll gladly read any documentation or tutorial, just I do not know which one is the best to start with. Thanks, Laszlo

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why? [win32com/WMI]
by Sergey March 1, 2006

March 1, 2006

import win32com.client loc = win32com.client.Dispatch("WbemScripting.SWbemLocator") svc = loc.ConnectServer("srv", "root/cimv2", "Admin(a)zzz.ru", "******") sys = svc.get("Win32_Process") sys.create("notepad.exe") => Traceback (most recent call last): File "remote.py", line 6, in ? sys.create("notepad.exe") TypeError: 'int' object is not callable

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PIL and PSDraw
by Sybren Stuvel March 1, 2006

March 1, 2006

Hi there, I'm experimenting with PIL to create a PostScript file. The end result should be an EPS file with a couple of bar graphs. At this moment, I have a very simple piece of code: ps = PIL.PSDraw.PSDraw(file('demo.ps', 'w')) ps.begin_document() ps.rectangle((0, 0, 650, 150)) ps.end_document() Unfortunately, when looking at 'demo.ps' using ghostview, I see an empty page. This feeling of 'emptyness' is augmented by 'ps2epsi', which tells me: $ ps2epsi demo.ps blank page!! Can anyone tell me what I'm doing wrong? I've just started to use PIL, so if there is something better to create EPS files, please let me know! Sybren The contents of demo.ps: ====================================================================== %!PS-Adobe-3.0 save /showpage { } def %%EndComments %%BeginDocument /S { show } bind def /P { moveto show } bind def /M { moveto } bind def /X { 0 rmoveto } bind def /Y { 0 exch rmoveto } bind def /E { findfont dup maxlength dict begin { 1 index /FID ne { def } { pop pop } ifelse } forall /Encoding exch def dup /FontName exch def currentdict end definefont pop } bind def /F { findfont exch scalefont dup setfont [ exch /setfont cvx ] cvx bind def } bind def /Vm { moveto } bind def /Va { newpath arcn stroke } bind def /Vl { moveto lineto stroke } bind def /Vc { newpath 0 360 arc closepath } bind def /Vr { exch dup 0 rlineto exch dup neg 0 exch rlineto exch neg 0 rlineto 0 exch rlineto 100 div setgray fill 0 setgray } bind def /Tm matrix def /Ve { Tm currentmatrix pop translate scale newpath 0 0 .5 0 360 arc closepath Tm setmatrix } bind def /Vf { currentgray exch setgray fill setgray } bind def %%EndProlog 0 0 M 650 150 0 Vr %%EndDocument restore showpage %%End ====================================================================== -- The problem with the world is stupidity. Not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself? Frank Zappa

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Re: Default Section Values in ConfigParser
by mwt March 1, 2006

March 1, 2006

Thanks, Terry. That's an interesting way to go about it.

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unicode question
by Edward Loper March 1, 2006

March 1, 2006

I would like to convert an 8-bit string (i.e., a str) into unicode, treating chars \x00-\x7f as ascii, and converting any chars \x80-xff into a backslashed escape sequences. I.e., I want something like this: >>> decode_with_backslashreplace('abc \xff\xe8 def') u'abc \\xff\\xe8 def' The best I could come up with was: def decode_with_backslashreplace(s): "str -> unicode" return (s.decode('latin1') .encode('ascii', 'backslashreplace') .decode('ascii')) Surely there's a better way than converting back and forth 3 times? Is there a reason that the 'backslashreplace' error mode can't be used with codecs.decode? >>> 'abc \xff\xe8 def'.decode('ascii', 'backslashreplace') Traceback (most recent call last): File "<stdin>", line 1, in ? TypeError: don't know how to handle UnicodeDecodeError in error callback -Edward

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