Steven D'Aprano wrote:
On Sun, 14 Mar 2010 11:20:15 +1300, Gib Bogle wrote:
Mark Lawrence wrote:
I'm certain that members of the Guinea Pig Club might have something to
say on that one, see :-
http://en.wikipedia.org/wiki/Guinea_Pig_Club
You mean, something like: "That
can I use?
Vicente Soler
Something like
import sys
sys.exit()?
HTH.
Mark Lawrence
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M serves to indicate both that it
is a Unicode file, and which of the formats it is in. Examples:
BytesEncoding Form
00 00 FE FF UTF-32, big-endian
FF FE 00 00 UTF-32, little-endian
FE FFUTF-16, big-endian
FF FEUTF-16, little-endian
EF BB BF UTF-8
-Mark
--
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):
if j:
etc...
If there's a better method for some definition of better I'm certain
we'll quickly get told.
Please see the python docs for the enumerate built-in.
HTH.
Mark Lawrence.
[snip the rest]
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ld be
from __past__ import __future__ as future
But the question is, have we yet got to 1984, are we currently there or
have we already gone past it? Who actually *IS* running the time
machine? Are there any bugs??
Regards.
Mark Lawrence.
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e the sub-keys in all cases.
HTH,
Mark
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out of bounds
Ofcourse it doesnt work with python2.7 too. Is this OSX specific issue ? Can
I make it work with my compiled version of python ? Is there any workaround
?
Are you thinking of this?
http://pypi.python.org/pypi/pyobjc-framework-DictionaryServices/2.2
HTH.
Mark Lawrence
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How do I install python 2.6.4 on Windows without admin privileges?
Can I install it on a machine I control, zip up the contents, copy it
across to an admin-restricted machine, and set up a couple of
environemtn variables? Does python install files to system
directories, making this impossible?
--
On 18 Mar, 15:23, "[email protected]" wrote:
> The only file written to a system folder is python2x.dll (I think it's
> not true for python2.6 any longer), so your approach is perfectly
> valid if you can put this dll into a folder where it can be found by
> the system.
Thanks. That sounds easy en
hannel: a good few of the people interested
in testing (esp. Michael Foord, Ezio Melotti) can often be found
there.
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Mark
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7;Surprise!')
>
> def test_main():
> test.test_support.run_unittest(UnicodeInterpolationTest)
>
> if __name__ == "__main__":
> test_main()
This looks like a fine start to me. I have a feeling that the current
fashion is for assertEqual rather than assertEquals, but I might be
wrong. :)
--
Mark
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ith Python.
Could somebody explain 'what holding the intellectual property rights'
means in this context and in what sense PSF manages the licensing and
protects the trademarks associated with Python? This is for my
education.
thanks
Mark
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emarks, which you can read at
>
> http://www.python.org/psf/trademarks/
>
> regards
> Steve
> --
> Steve Holden Chairman, Python Software Foundation
> See PyCon Talks from Atlanta 2010 http://pycon.blip.tv/
> Holden Web LLC http://www.holdenweb
Hi all,
I have just released Shed Skin 0.4, an experimental (restricted) Python-to-C++
compiler. Please see my blog for more details about the release:
http://shed-skin.blogspot.com/
Thanks,
Mark Dufour.
--
"Overdesigning is a SIN. It's the archetypal example of what I call
uld be:
writer.endElement('dir')
break
if __name__ == '__main__':
directory = 'c:\\_TEST\\'
out = open('C:\\_TEST.xml','w')
The above line opens the file in the default file system encoding 'mbcs'
(cp850 on
Steven D'Aprano writes:
> > def foo():
> > l = []
> > for i in xrange(10):
> > (lambda j: l.append((lambda: i, lambda: j)))(i)
> > print [(f(), g()) for f, g in l]
>
> Here's a slightly less condensed version that demonstrates the same
> behaviou
Arnaud Delobelle writes:
> >>> exec "a=2" in d
> assigning 2 to 'a'
> >>> d['a']
> 2
>
> >>> exec "global a; a = 3" in d
> >>> d['a']
> 3
Oooh, now isn't that an interesting wrinkle? I've been careful (without
drawing attention) to restrict my arguments to variables inside
functions, largely be
Dmitry Groshev writes:
> First of all: how many times do you write something like
> t = foo()
> t = t if pred(t) else default_value
> ? Of course we can write it as
> t = foo() if pred(foo()) else default_value
> but here we have 2 foo() calls instead of one. Why can't we write just
>
might add:
"The xml.etree.ElementTree now raises an
xml.etree.ElementTree.ParseError when a parse fails; previously
it raised a xml.parsers.expat.ExpatError."
It would also be nice to mention this in the ElementTree module's
documentation for the
Hans writes:
> I tried socket bind to 0.0.0.0, but it only binds to any local ip, not
> any ip which may not be local. therefore the socket cannot get that
> dhcp offer packet even I can use wireshark to see that packet did come
> to this pc.
You must use a raw socket for this. Raw sockets are
Christopher writes:
> i don't like magic names. what about:
>
> t = foo() as v if pred(v) else default_value
This is an improvement on `it'; anaphorics are useful in their place,
but they don't seem to fit well with Python.
But I don't think that's the big problem with this proposal. The real
OO or Pythonish; and
more to the point other people will have to use it. I hate when people
inflict quick, dirty, stupid, ugly, lazy programmer abominations on me;
and so I feel obligated to do it right rather than inflict an abomination
on others... :)
Thanks in advance for any pointers
thod. Then to
get the stream, I'd do something like
stream = [self getStream];
Have you looked at ctypes? It's not suitable for all libraries, but
it can often obviate the need to write any C code:
http://docs.python.org/release/2.6.6/library/ctypes.html#module-ctypes
Mark Crispin writes:
> I have a Python module written in C that interfaces with an external C
> library. Basically, the project is to make it possible to use that
> library from Python scripts. If you know who I am, you can guess
> which library. :)
You have your very own Wikipe
Alexander Kapps writes:
> Application: Usually a large(er), complex program
I'd say that an `application' is specifically a program intended for
direct human use. Other things are servers, daemons and utilities. But
I might just be weird.
-- [mdw]
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On Thu, 18 Nov 2010, Mark Wooding posted:
[snip]
Whoo-hoo! That's exactly what I was looking for.
If we ever meet in person, I owe you a beer, sir. And by that I mean real
beer (from what we call a "microbrew"), not Budweiser... :)
-- Mark --
http://panda.com/mrc
Democrac
Steven D'Aprano writes:
> On Wed, 17 Nov 2010 16:31:40 +0000, Mark Wooding wrote:
>
> > But I don't think that's the big problem with this proposal. The real
> > problem is that it completely changes the evaluation rule for the
> > conditional expression.
John Nagle writes:
> Python is defined by what a naive interpreter with late binding
> and dynamic name lookups, like CPython, can easily implement. Simply
> emulating the semantics of CPython with generated code doesn't help
> all that much.
Indeed.
> Because you can "monkey patch"
Steven D'Aprano writes:
> >> Not everything needs to be a one liner. If you need this, do it the
> >> old- fashioned way:
> >>
> >> t = foo()
> >> if not pred(t): t = default_value
> >
> > I already explained how to write it as a one-liner:
> >
> > t = (lambda y: y if pred(y) else defau
Steven D'Aprano writes:
> On Thu, 18 Nov 2010 14:21:47 +, Martin Gregorie wrote:
>
> > I use 'script' to refer to programs written in languages that don't have
> > a separate compile phase which must be run before the program can be
> > executed. IOW Python and Perl programs are scripts aloin
ust use the existing Fraction.limit_denominator method
(which does indeed use some number theory and continued fractions):
>>> from fractions import Fraction
>>> from math import pi
>>> Fraction.from_float(pi).limit_denominator(1000)
Fraction(355, 113)
--
Mark
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ariate(12345.0, 6.0) for _ in xrange(10)]
>>> print samples
[10355.396846416865, 14689.507803932587, 11491.850991569485,
14128.56397290655, 12592.739991974759, 9076.7752548878998,
11868.012238422616, 12016.784656753523, 14724.818462506191,
13253.477389116439]
Is this the sort of thing you were looking for?
--
Mark
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Daniel Fetchinson writes:
> So after all I might just code the inversion via Gauss elimination
> myself in a way that can deal with fractions, shouldn't be that hard.
I wouldn't do it that way. Let M be your matrix. Work out the LCM l of
the denominators, and multiply the matrix by that to mak
Daniel Fetchinson writes:
> > I wouldn't do it that way. Let M be your matrix. Work out the LCM l of
> > the denominators, and multiply the matrix by that to make it an integer
> > matrix N = l M. Then work out the determinant d of that integer matrix.
> > Next, the big step: use Gaussian elim
John Nagle writes:
>Multiple inheritance in Python is basically what fell out of
> CPython's internals, not a design. It's one of those areas where
> order of execution matters, and that wasn't well worked out.
I'm not sure about the history, but this doesn't sound right to me.
> Allowing
John Nagle writes:
> I'd argue that a better implementation would require that when there's
> a name clash, you have to specify the class containing the name. In
> other words, if A is a subclass of B, then B.foo() overrides
> A.foo(). But if C is a subclass of A and B, and there's an A.foo() an
John Nagle writes:
> On 11/26/2010 4:21 PM, Mark Wooding wrote:
> > John Nagle writes:
> >> @This catches the case where two classed both inherit from, say
> >> "threading.thread", each expecting to have a private thread.
> >
> > Why on earth wou
casevh writes:
> I coded a quick matrix inversion function and measured running times
> using GMPY2 rational and floating point types. For the floating point
> tests, I used a precision of 1000 bits. With floating point values,
> the running time grew as n^3. With rational values, the running tim
Steve Holden writes:
> It isn't. Even inheritance itself isn't as useful as it at first
> appears, and composition turns out in practice to be much more useful.
> That goes double for multiple inheritance.
Composition /with a convenient notation for delegation/ works fairly
well. Indeed, this c
Grant Edwards writes:
> On 2010-11-30, mpnordland wrote:
> > and catch user switching eg user1 locks screen, leaves computer,
> > user2 comes, and logs on. basically, when there is any type of user
> > switch my script needs to know.
>
> What do you do when there are multiple users logged in?
I
gt;> 5 in range(0, 10**100, 2)
False
>>> 10**99 in range(0, 10**100, 2)
True
IIRC, there wasn't sufficient interest to get it backported to Python
2.7 in time for its release. Though as a pure optimization, one could
argue that it would still be possible to get this into Python 2.7.2.
Mark
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Harishankar writes:
> There are some reasons why I hate exceptions but that is a different
> topic. However, in short I can say that personally:
>
> 1. I hate try blocks which add complexity to the code when none is
> needed. Try blocks make code much more unreadable in my view and I use it
>
Steven D'Aprano writes:
> On Thu, 02 Dec 2010 16:35:08 +0000, Mark Wooding wrote:
> > There are better ways to handle errors than Python's exception system.
>
> I'm curious -- what ways would they be?
The most obvious improvement is resumable exceptions.
kj writes:
> >>> class Spam(object): pass
>
> Now I define an instance of Spam and an instance of Spam's superclass:
> >>> x = Spam()
> >>> y = Spam.__mro__[1]() # (btw, is there a less uncouth way to do this???)
There's the `__bases__' attribute, which is simply a tuple of the
class's direct su
Paul Rubin writes:
> You know, I've heard the story from language designers several times
> over, that they tried putting resumable exceptions into their languages
> and it turned out to be a big mess, so they went to termination
> exceptions that fixed the issue.
That seems very surprising to m
John Nagle writes:
> Resumable exceptions were a popular idea in the early days of
> programming. LISP, PL/I, and early COBOL had constructs which could
> be considered resumable exceptions. They didn't work out well,
> because the exception handler gets control in an ambiguous situation,
> per
Terry Reedy writes:
> And indeed, code like this that has not been updated does break in
> 3.x. to some people's annoyance. We really really cannot please
> everyone ;-).
The problem is that there are too many useful properties that one might
expect from comparison operators. For example, it's
John Nagle writes:
> Right. You're not entitled to assume that StopIteration is how a
> generator exits. That's a CPyton thing; generators were a retrofit,
> and that's how they were hacked in. Other implementations may do
> generators differently.
This is simply wrong. The StopIteration exc
Carl Banks writes:
> On Dec 6, 12:58 pm, [email protected] (Mark Wooding) wrote:
> > def toy(x, y):
> > r = restart('use-value')
> > with r:
> > if y == 0:
> > error(ZeroDivisionError())
> >
John Nagle writes:
>PEP 255, like too much Python literature, doesn't distinguish
> clearly between the language definition and implementation detail. It
> says "The mechanics of StopIteration are low-level details, much like
> the mechanics of IndexError in Python 2.1". Applications should
John Nagle writes:
[Stepanov]
> makes the point that, for generic programs to work right, the basic
> operations must have certain well-defined semantics. Then the same
> algorithms will work right across a wide variety of objects.
>
> This is consistent with Python's "duck typing", but inconsis
Carl Banks writes:
> I think that feeling the need to sort non-homogenous lists is
> indictative of bad design.
Here's a reason you might want to.
You're given an object, and you want to compute a hash of it. (Maybe
you want to see whether someone else's object is the same as yours, but
don't
"OKB (not okblacke)" writes:
> This is an interesting setup, but I'm not sure I see why you need
> it. If you know that, in a particular context, you want toy(x, 0) to
> result in 42 instead of ZeroDivisionError,
... and that's the point. You don't know whether you'll need it at the
c
ycode and zipping it without the __init__.py file .
I am not sure which is the correct way.
Can somebody advise me as to how I can package it better?
thanks,
mark
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John Nagle writes:
> >>> NaN = float("nan")
> >>> arr = [1.0, 4.0, 3.0, 2.0, 5.0, NaN, 6.0, 3.0, NaN, 0.0, 1.0, 4.0,
> 3.0, 2.0, 5.0, NaN, 6.0, 3.0, NaN, 0.0]
> >>> sorted(arr)
> [0.0, 0.0, 1.0, 1.0, 2.0, 2.0, 3.0, 3.0, 3.0, 3.0, 4.0, 5.0, nan, 5.0, 6.0,
> nan, 4.0, nan, 6.0, nan]
>
> The sorted
cess until everything is complete - the host program would
then call this method just before it terminates.
Also note there is a [email protected] mailing list where you
might get better or more advice...
Cheers,
Mark
On 8/12/2010 8:03 PM, [email protected] wrote:
Greetings gurus.
ocalError: local variable 'f' referenced before assignment
Is there a way to overcome the DeprecationWarning? I wanted to print
the error message from the IOError.How do I do this?
Also ,what should I do about the UnboundLocalError?
thanks and regards ,
mark
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)
except Exception,e:
display_message(e.args)
handle_exception(e)
thanks,
mark
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Steven D'Aprano writes:
> On Thu, 09 Dec 2010 12:21:45 +0000, Mark Wooding wrote:
>
> > John Nagle writes:
>
> >> "sort" has failed because it assumes that a < b and b < c implies a <
> >> c. But that's not a valid assumption here
code, but I think you should pass the original "sn"
pointer from smiGetNode() and not a pointer(sno). The values are not the
same and the library probably relies on passing the original pointer back
into smiGetNextNode. sn.contents returns a new SmiNode object so its
pointer wi
on all the data types), but I've been
able to get a tremendous amount of work done in a very short period of
time.
Oh, I've made it SEGV a few times, but these were all blunders in my C
module, such as a C method returning self to indicate success (oops!).
Python is the best d
Mark Crispin writes:
> In a C module, I want to pick up the arguments for a Python call like:
> module.call("string1",["string2a", "string2b", "string2c"], "string3")
> and stash these into:
> char *arg1;
> char
strings can be passed directly to
c_char_p arguments.
SmiGetNode = clibsmi.smiGetNode
SmiGetNode.argtypes = [POINTER(SmiModule),c_char_p]
SmiGetNode.restype = POINTER(SmiNode)
oid = "1.3.6.1.2.1.2.2"
sn=SmiGetNode(None,oid)
Give these fixes a try...
-Mark
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see my blog
for the full announcement:
http://shed-skin.blogspot.com
Or go straight to the homepage:
http://shedskin.googlecode.com
Please have a look at the tutorial, try it out, and report issues at the
homepage.
Thanks,
Mark Dufour
--
http://www.youtube.com/watch?v=E6LsfnBmdnk
--
http
oth has a GUI and uses the multiprocessing module in combination with a
shedskin-generated extension module.
thanks,
mark.
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Steve Holden writes:
> I think the choice of keyword is probably not Guido's crowning
> language achievement,
I remember the behaviour by considering a typical application:
for thing in things:
if shinyp(thing):
break
else:
raise DullError, 'nothi
I am about to learn Higher-Order-Programming with Lisp, Haskell, and
Python. Some people who have gone completely out of their mind call
this FP.
In Haskell I learned that when I use map on a list it starts nesting
as soon as I start adding elements. If I do not like the nesting I use
ConcatMap.
> >>> list(chain.from_iterable(starmap(product, izip(izip(dims.iterkeys()),
>
> dims.itervalues()
> [('special', '+'), ('special', '-'), ('number', 1), ('number', 2),
> ('number', 3), ('letter', 'a'), ('letter', 'b')]
>
> Peter
so far I have never noticed chain.from_iterable, but many thanks t
Ciccio writes:
> suppose I have:
>
> s='a=b, c=d'
>
> and I want to extract sub-strings a,b,c and d from s (and in general
> from any longer list of such comma separated pairs).
[...]
> In [12]: re.findall(r'(.+)=(.+)', s)
> Out[12]: [('a=b, c', 'd')]
I think there are two logically separate job
André writes:
> How about the following:
>
> >>> s = 'a=b,c=d'
> >>> t = []
> >>> for u in s.split(','):
> ... t.extend(u.split('='))
s = 'a = b = c, d = e'
=> ['a ', ' b ', ' c', ' d ', ' e']
Ugh.
-- [mdw]
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kj writes:
> But OrderedDict's functionality *requires* that its __init__ be
> run, and this __init__, in turn, does part of its initialization
> by calling the update method.
>
> Therefore, the update method of the new subclass needs to be able
> to identify the calling function in order to make
s
in your string constants (ä instead of \xe4). Make sure to use a text
editor that can save in UTF8, or use the correct coding comment for whatever
encoding in which you save the file.
# coding: utf8
import codecs
item=u'hyvä'
F=codecs.open('finnish.txt', 'w+', 'utf8')
F.write(item)
F.close()
-Mark
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t of the example the OP gave would be 9.9
exactly. But since 9.9 isn't exactly representable as a Python float,
we necessarily get an approximation. The language above is intended
to convey that it's the 'correctly rounded' approximation---that is,
the closest Python float to the true value of 9.9 (with halfway cases
rounded to even, as usual).
Mark
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its values are positive.
It's also slightly unsettling usage for me, not least because the
statement 'f is correctly rounded' for a floating-point function f is
really a statement about *two* functions: namely, f (a function from
floating-point numbers to floating-point numbers) and the true
mathematical function that it's based on; the identity of the
underlying mathematical function is left implicit.
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Mark
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I'm using Python 2.6.5. I would like to be able to print an RTF file,
with no prompts for printers or anything like that.
Here's the code so far:
import wx.richtext
rtp = wx.richtext.RichTextPrinting()
rtp.PrintFile('C:\\path\\to\\file.rtf')
When I run it, it says: ... assert "(wxThePrintPaperDat
ResourceWarning: unclosed file <_io.TextIOWrapper name='/dev/null'
mode='a' encoding='UTF-8'>
which looks pretty good:-)
However, I hit a problem with relative imports not working (compared
with 3.1). I have to go now but will try to produce a small example if I
can.
2011, 08:32:59)
[GCC 4.4.5] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from Graphics.Vector import *
Traceback (most recent call last):
File "", line 1, in
File "Graphics/Vector/Sv
On Mon, 17 Jan 2011 09:23:39 -0500
"R. David Murray" wrote:
> On Mon, 17 Jan 2011 08:33:42 +, Mark Summerfield
> wrote:
> > from ..Graphics import Xpm
> > SVG = 1
> >
> > I can do the relative import with Python 3.0 and 3.1 but not with
> > 3.2
If you guys spent 1/10th as much time articulating the problems you see
with Tkinter (and being willing to listen when people offer solutions)
as you do trying to convince everyone else you're right, you'd probably
have ... well, anyway, no sense in being practical.
--
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and significant limitation of Tk.
I will attempt to find out if there has been any work done in this area
with Tk, and what it would take to address this important issue.
Thanks again
Mark
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I'm using Python 2.6.5 on win32. I would like to print a batch of RTF
files on a printer. I don't want to use the win32api.ShellExecute
command because that invokes Word, and Word has been configured in a
strange way by one of our admins, making it inconvenient to use.
What should I do?
--
http:/
nt
requirements and priorities, the "best" solution will be different.
I don't object and in fact commend you for advocating for accessibility.
I do feel you are not acknowledging and fully respecting that others may
be in situations where accessibility may not be the primar
lkits would be very receptive to people who could help make
developing accessible applications with their toolkits feasible.
(And if/when this does get done for Tk, I promise at least to make sure
that the tutorial at http:///www.tkdocs.com covers this topic).
Mark
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On Jan 24, 5:09 pm, santosh hs wrote:
> Hi All,
> i am beginner to python please tell me which is the best available
> reference for beginner to start from novice
If you want to learn Python 3 and have some prior programming
experience (in any modern procedural or object oriented language), you
m
his class (A.foo, for instance) should not
> >execute as long as this boolean is false, but should instead raise an
> >exception.
>
> >Can I use a decorator to implement this functionality? More exactly,
> >could I define a function called 'checker' that
Python
including a Tcl interpreter to use Tk, I'd be happy to try to explain or
address them.
Mark
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that
are used everywhere inside Tk. But none of those calls mean a trip
through the Tcl interpreter per se.
Every dynamic language would have similar internals of course, though
with slight differences and different API's.
Mark
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Is there a way of testing whether a frame (suppose I have it as a
variable my_frame) is hidden in wxPython?
Also, is there a way that I can over-ride the close button so that the
frame becomes hidden rather than destroyed, and perform supplementary
tests?
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On Feb 11, 1:39 pm, Vlastimil Brom wrote:
> (wxPython-specific questions may be rather discussed on that
> maillist:http://groups.google.com/group/wxpython-users/topics?pli=1
Just the ticket! Many thanks!
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les" in What's New in alphabetical order?
--
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C++, Python, Qt, PyQt - training and consultancy
Programming in Python 3" - ISBN 0321680561
http://www.qtrac.eu/py3book.html
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not,
do you have any references?
Maybe you should have saved this for March 14th...
Mark
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ation
instructions, please visit the class web page:
http://learning-python.com/2010-public-classes.html
If you are unable to attend in April, our next Sarasota
class is already scheduled for July 13-15.
Thanks, and we hope to see you at a Python class in
Florida soon.
--Mark Lutz (lutz at lea
.org/
The best method for installing numpy would depend on your system, and
on where you got Python from. On OS X, the system Python comes with
numpy as standard, for example. On Linux, there's probably a python26-
numpy package (or something with a similar name) that you can
install. On Windows: no idea. :)
Mark
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should not have forgotten that precondition).
And parallel lines, where m and n are equal (divide-by-zero)...
-Mark
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it gets me there in the end.
Mark Lawrence
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st a
brick wall. Democracy, please don't make me laugh.
Oh, and see this http://www.computerweekly.com/Articles/2010/01/14/239954/
faulty-safety-critical-software-changed-after-fatal-mull.htm
Kindest regards.
Mark Lawrence.
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)
>>> libc
>>> printf = libc.printf
>>> printf.argtypes = [c_char_p, c_int]
>>> printf("%d\n", 53)
53
3
>>> printf("%d\n", "asdf")
Traceback (most recent call last):
File "", line 1, in
ctypes.ArgumentError: argument 2: : wrong
type
--
Mark
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2com doesn't support that directly it
shouldn't be hard to support this with a few changes to
win32com\server\register.py
HTH,
Mark
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e dirs holding things. Spambayes has a complicated setup file
which may offer some insights - find the spambayes source at sourceforge
then look for the spambayes/spambayes/windows/py2exe/setup_all.py file
for inspiration...
HTH,
Mark.
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manager = win32com.client.DispatchWithEvents("WIA.DeviceManager",
MgrHandlerClass)
manager.RegisterEvent(EventID=constants.wiaEventDeviceConnected,DeviceID=u'*')
manager.RegisterEvent(EventID=constants.wiaEventDeviceDisconnected,DeviceID=u'*')
And magically your OnEvent
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