🌐 Mailman 3 June 2005 - Python-list - python.org

Re: how to shrink a numarray array?
by Diez B. Roggisch June 30, 2005

June 30, 2005

Qiangning Hong wrote: > To draw a large array of data on a small panel, I need to shrink it to a > given size. e.g: > > To draw numarray.arange(10000) on a panel of width of 100, I only need > to draw the points of (0, 100, 200, 300, ...) instead of (0, 1, 2, ...). > So I need a method to shrink it to an 100-item array. > > x[::len(x)/panel_width] will not work. If the panel's width is 60, that > expression will return an array of 61 elements. > > I believe there is an existing function in numarray to do this, however > English is not my mother tongue and math is not my speciality, I can't > find it in the document full of math terms... > You can do that with bresenham's algortithm. But that's been sooo long since I did that the last time... The basic idea is that you us the larger of the values (your columncount) as a threshold. The you do msomething like this: columncount = 600 image_width = 60 v = 0 cols_to_pick = [0] for i in xrange(columncount): if v >= columncount: v -= columncount cols_to_pick.append(i) v += image_width Maybe a better idea is to try and find image scaling algorithms -they might even do filtering for you. Diez

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Re: When someone from Britain speaks, Americans hear a "British accent"...
by Bill June 30, 2005

June 30, 2005

James Stroud wrote: > Frankly, I can't watch Shakespeare or movies like "the full monty" or > "trainspotting" because I can't understand a damn word they say. British talk > sounds like gibberish to me for the most part. Have you had your hearing checked recently? Seriously. I have a hearing defect and speakers from the UK give me by far the most difficulty. People speaking English as a second language are more understandable.

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saving pre-compiled scripts
by Derek van Vliet June 30, 2005

June 30, 2005

Hi, I'm working on an application that reads python scripts from XML elements and compiles them during my app's startup process using. The application then runs the resulting compiled PyCodeObjects using PyEval_EvalCode as they are needed. Now I'm wondering if its possible to pre-compile the scripts and save the PyCodeObjects in a binary file (or in CDATA in an XML element) and have them ready to run when the application starts up. My only constraint is that I need to be able to load the scripts from memory (which is why using Py_CompileString has worked well for me). Is there any way I can get the size of a PyCodeObject so that I could save it to a binary file? If I did that would it run correctly if I reloaded it and tried to Eval it? Can I load a pyc file from memory somehow? Any guidance would be greatly appreciated. Thanks, Derek

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class attribute to instance attribute
by Donnal Walter June 30, 2005

June 30, 2005

This is a question about Python patterns or idioms. Over a period of time, I have evolved a pattern of usage that seems to work better for me than other ways I tried previously, but in writing some documentation I don't know what to call this syntax or how best to describe it. I have not seen it used in other places. The somewhat longish version is that I have implemented an MVP (model-view-presenter) architecture where each "presenter" has a "view" as an attribute. Take the TextField and Frame presenters for example. Here is one way to do it: import wx class TextField: def __init__(self): # do some things here to calculate *args self.view = wx.TextCtrl(*args) # do more things to set up the view # and more methods to make this a presenter class Frame: def __init__(self): # do some things here to calculate *args self.view = wx.Frame(*args) # do more things to set up the view # and more methods to make this a presenter There are a number of presenters, some of which have the same type of view (TextField and NumberField, for example) and many of which have different views (Frame and Notebook, for example). The way I have chosen to do this is to put the logic in one superclass, "Presenter": class Presenter: view = None def __init__(self): # do some things here to calculate *args # if view is class, create instance if callable(self.view): self.view = self.view(*args) # do more things to set up the view # and more methods to make this a presenter class TextField(Presenter): view = wx.TextCtrl class Frame(Presenter): view = wx.Frame Then: >>> app = wx.App(False) >>> f = Frame() >>> isinstance(f.view, wx.Frame) True To summarize, each subclass has a class attribute "view" that is converted to an instance attribute of the same name at runtime. Is this a common Python idiom? If so, does it have a name? Is there a better way to do the same thing? Regards, Donnal Walter Arkansas Children's Hospital

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doc 2 pdf
by Alberto Vera June 30, 2005

June 30, 2005

Hello. I tried to use reportlab to convert a doc to pdf file, but i didn't found any script to do this using python. Do you have any script to convert a doc file? (doc->pdf) Regards

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Re: Life of Python
by ABO June 30, 2005

June 30, 2005

> Okay. This makes sense if the software is: > > 1) Designed by one institution. > 2) Designed almost entirely before deployment. > 3) Not designed to be worked on by users and > semi-trained developers. > > In other words --- proprietary software. In my experience, it doesn't work well even in these cases. Investing a huge amount of effort designing in detail well in advance is nearly always a mistake, unless the requirements are fully understood and static... ie never. Mostly the requirements are unknown until the (possibly internal) customer has something. Nothing identifies requirements better than deployment. Particularly with large projects that have long development times, even if the requirements are well understood at the start, they will have changed by the time it is deployed. The biggest and most common mistake with software development is believing that it finishes. Software has a lifecycle, and development is like food; it is constantly required, otherwise the software dies. -- Donovan Baarda

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Re: python commmand line params from c++
by Wesley Henwood June 30, 2005

June 30, 2005

Thanks Denis. PySys_SetArgv should do the trick. The nested function calls are there because the FILE structrure produced by fopen is not always compatible with the FILE structure produced by the Python C++ functions. Something do with the Python C being built with different version ofthe c run-time libs. The FILE problem is a bit strange and should be adressed, it's documented somewhere on the Python site, but no solution is given. That I had to find by trial and error. Even better would be a function such as PyRun_File(char *filename), and do away with handling the FILE structure altogether.

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python commmand line params from c++
by Wesley Henwood June 30, 2005

June 30, 2005

What is the proper way to pass command line parameters to a python script called from C++? I'm tryng this: path = "c:\\someDir\\someScript.py param1 param2 param3"; PyRun_SimpleFile(PyFile_AsFile( PyFile_FromString( path, "r")), "someScript.py"); I'm getting a "format error someScript.py, line 1" when the code is executed. Note: The strange appearannce of the 3 python function calls nested is not a bug, but required to prevent a run-time error.

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Re: When someone from Britain speaks, Americans hear a "British accent"...
by Tom Anderson June 30, 2005

June 30, 2005

On Thu, 30 Jun 2005, Simon Brunning wrote: > On 29 Jun 2005 15:34:11 -0700, Luis M. Gonzalez <luismgz(a)gmail.com> wrote: > >> What's exactly the "cockney" accent? Is it related to some place or >> it's just a kind of slang? > > The cockney accent used to be pretty distinct, but these days it's > pretty much merged into the "Estuary English" accent common throughout > the South East of England. I grew up in Colchester, in the heart of Essex, the homeland of Estuary English; i was recently told by a couple of Spanish colleagues that i sounded just another colleague who has a Cockney accent. Although, in fact, my parents aren't Essexen, and i left the county seven years ago, so my accent is weird hybrid of Estuary and RP, and the colleague isn't a real Cockney - i think he's from east-north-eastern London - but he does overcompensate pronounciation-wise, so i don't know what it all means. It's also complicated by the fact that Essex actually has two completely different accents - the town accent, which is Estuary and is pretty much derived from emigrants from East London, and the country accent, which is indigenous, and very similar to the Suffolk and Norfolk accents. I grew up in a village and went to school (and went drinking etc) in the nearby town, so i was exposed to a different accents at different times of day! >> I'm not sure, but I think that I read somewhere that it is common in >> some parts of London, and that it is a sign of a particular social >> class, more than a regionalism. Is that true? > > Cockney was London's working class accent, pretty much, thought it was > frequently affected by members of the middle classes. Estuary English > has taken over its position as the working class accent these days, > but with a much wider regional distribution. blimey guvnor you is well dahn on ar muvver tung, innit? > How off topic is this? Marvellous! Spike Milligan did an excellent sketch in the style of a TV pop-anthropology documentary visiting the strange and primitive Cockanee people of East London. It was part of one of his Q series; i'm not sure which, but if it was Q5, then it would have had a direct impact on the Monty Python team, since that series basically beat them to the punch with the format they'd planned to use, forcing them to switch to the stream-of-consciousness style that became their trademark and which is the basis for python's indentation-based block structure. Therefore, if it hadn't been for the quirks of the Cockney accent, we'd all be using curly brackets and semicolons. FACT. tom -- I know you wanna try and get away, but it's the hardest thing you'll ever know

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Re: Seeking IDE
by Ruben Baumann June 30, 2005

June 30, 2005

"Nick Mountford" <nick.mountford(a)gmail.com> wrote in message news:mailman.1133.1120151988.10512.python-list@python.org... Hi, Complete newb to Python and programming, looking for an open source IDE to download. Any suggestions? Thanks, Nick SPE (Can be used in editor mode only if desired, but comes with WxGlade for GUI) Boa Constructor, VisualWx, Python Card (if your desire a GUI approach) RB

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