* Alf P. Steinbach /Usenet, on 21.09.2010 01:09:
* Astley Le Jasper, on 20.09.2010 23:42:
I have a list of tuples that indicate a relationship, ie a is related
to b, b is related to c etc etc. What I want to do is cluster these
relationships into groups. An item will only be associated
* Arnaud Delobelle, on 21.09.2010 11:13:
On Sep 21, 7:19 am, Alf P. Steinbach /Usenetalf.p.steinbach
+use...@gmail.com wrote:
* Alf P. Steinbach /Usenet, on 21.09.2010 01:09:
* Astley Le Jasper, on 20.09.2010 23:42:
I have a list of tuples that indicate a relationship, ie a is related
group (recurse on each symbol's list of equivalences).
Approaches 1 and 2 seem to be pretty inefficient for a large number of symbols,
but I think approach 1 may be a practical option for a small number of symbols.
Cheers hth.,
- Alf
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might be that its argument is a sorted array. So regarding the nature of the
checks it's not hopelessly incompatible with Python.
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- Alf
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* Standish P, on 16.08.2010 09:20:
[garble garble]
Nonsense article We look for an exogenous stack cross-posted to
[comp.lang.c],
[comp.lang.c++],
[comp.theory],
[comp.lang.python],
[comp.lang.forth].
Please refrain from following up on Standish' article.
Cheers,
- Alf
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* Vladimir Jovic, on 19.07.2010 09:41:
Alf P. Steinbach /Usenet wrote:
#include progrock/cppy/PyClass.h // PyWeakPtr, PyPtr, PyModule,
PyClass
using namespace progrock;
namespace {
using namespace cppy;
struct Noddy
{
PyPtr first;
PyPtr last
this is a leftover from Python 2.x, where strings were bytes, and that
this is a bug?
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. [Ctrl V]).
And then, if you haven't already figured it out, somebody probably will. :-)
Cheers hth.,
- Alf
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requirement is
simply one of fitting in, conformance. Thus, if my hypothesis is right, almost
any idiot can rise to any level of responsibility and social standing simply by
fitting in, conforming. This idiot then has good money and might be one of the
suckers responding to spam.
Cheers,
- Alf
,
- Alf
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* Alf P. Steinbach /Usenet, on 17.07.2010 11:50:
[Cross-posted comp.lang.c++ and comp.lang.python]
[snip]
this occurred to me:
#define CPPY_GETSET_FORWARDERS( name ) \
::progrock::cppy::forwardersGetSet( \
CppClass
-- not the Python
technicalitities -- google up KWIC, KeyWord In Context. It's a common exercise
problem given to first or second-year students. So I think there should be an
abundance of answers and discussion, although I haven't googled.
Cheers hth.,
- Alf
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* Hrvoje Niksic, on 14.07.2010 10:17:
Alf P. Steinbach /Usenetalf.p.steinbach+use...@gmail.com writes:
Also, things like the 'owned' option is just asking for trouble.
Isn't owned=true (or equivalent) a necessity when initializing from a
PyObject* returned by a function declared to return
* geremy condra, on 09.07.2010 23:43:
On Fri, Jul 9, 2010 at 5:22 PM, Ian Collinsian-n...@hotmail.com wrote:
On 07/10/10 03:52 AM, Alf P. Steinbach /Usenet wrote:
[Cross-posted comp.lang.python and comp.lang.c++]
I lack experience with shared libraries in *nix and so I need to ask
* Robert Kern, on 13.07.2010 17:16:
On 7/13/10 2:34 AM, Alf P. Steinbach /Usenet wrote:
PS: You (the reader) may be wondering, why why why Yet Another Python/C++
binding? Well, because I had this great name for it, pyni, unfortunately
already in use. But cppy is very different from Boost
.
}
/code
... compiles, and works.
Cheers, thanks,
- Alf
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* sturlamolden, on 13.07.2010 22:03:
On 9 Jul, 17:52, Alf P. Steinbach /Usenetalf.p.steinbach
+use...@gmail.com wrote:
For an extension module it seems that Python requires each routine to be defined
as 'extern C'.
That is strange. PyMethodDef is just a jump table. So why should
'extern C
* sturlamolden, on 13.07.2010 22:06:
On 13 Jul, 21:39, Alf P. Steinbach /Usenetalf.p.steinbach
+use...@gmail.com wrote:
Thanks! It seems that SCXX does those things that I've been planning to do but
haven't got around to (wrapping standard Python types), while what it doesn't do
(abstracting
print x.var, y.var # prints: 99 99
This code goes through hoops to /hide/ the fact of the sharing.
Rather, I'd make that as explicit as possible.
Like,
x = {sharedVar: 123}
y = x
The one won't be surprised when changing x[sharedVar] also changes
y[sharedVar].
Cheers hth.,
- Alf
* Steven D'Aprano, on 14.07.2010 06:31:
Gary did the right thing by pointing out that the simple-sounding term
points to is anything but simple, it depends on what you mean by
pointing and pointers.
Possibly you have a point here.
Cheers,
- Alf
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* sturlamolden, on 12.07.2010 06:52:
On 11 Jul, 21:37, Alf P. Steinbach /Usenetalf.p.steinbach
+use...@gmail.com wrote:
Oh, I wouldn't give that advice. It's meaningless mumbo-jumbo. Python works like
Java in this respect, that's all; neither Java nor Python support 'swap'.
x,y = y,x
. Is it so?
Cheers,
- Alf
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* sturlamolden, on 12.07.2010 16:59:
On 12 Jul, 07:51, Alf P. Steinbach /Usenetalf.p.steinbach
+use...@gmail.com wrote:
We're talking about defining a 'swap' routine that works on variables.
I did not miss the point. One cannot make a swap function that rebinds
its arguments in the calling
* Steven D'Aprano, on 12.07.2010 04:39:
On Mon, 12 Jul 2010 03:12:10 +0200, Alf P. Steinbach /Usenet wrote:
* MRAB, on 12.07.2010 00:37:
[...]
In Java a variable is declared and exists even before the first
assignment to it. In Python a 'variable' isn't declared and won't exist
until
(Monday)
('Locals:', {'day': 'Monday'})
foo.func_code.co_varnames
('day', 'x')
foo.func_code.co_nlocals
2
So, the question is, is x a local variable or not? It's not in locals,
but the function clearly knows that it could be.
So Alf P.S. could be right; x exists, but Python pretends
= 'This is a demo package',
ext_modules = [module1]
)
/code
Cheers,
- Alf
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* Rami Chowdhury, on 13.07.2010 00:14:
Perhaps I'm misunderstanding, but ...
On Jul 12, 2010, at 13:57 , Alf P. Steinbach /Usenet wrote:
Existence of a variable means, among other things, that
* You can use the value, with guaranteed effect (either unassigned exception
or you get
* Steven D'Aprano, on 13.07.2010 01:50:
On Mon, 12 Jul 2010 22:57:10 +0200, Alf P. Steinbach /Usenet wrote:
Existence of a variable means, among other things, that
* You can use the value, with guaranteed effect (either unassigned
exception
or you get a proper value
* Steven D'Aprano, on 13.07.2010 01:34:
On Mon, 12 Jul 2010 20:28:49 +0200, Alf P. Steinbach /Usenet wrote:
As I see it it doesn't matter whether the implementation is CPython call
frame slots or that mechanism called something else or a different
mechanism called the same or a different
Cheers hth.,
- Alf
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it's an error committed not
by the limbic system but by a slightly higher level sound-to-text translator
brain circuit. The text is generated from how the word sounds in one's head.
Cheers hth.,
- Alf
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this nonsense would be rectified! Str, Float, List, Range,
etc, etc. You think Python 3000 was a hump to climb over just wait for
Python 4000.
Just thoughts.
Just do
Str = str
List = list
Float = float
and so on in module myBasicTypes, and import that.
:-)
Cheers hth.,
- Alf
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in any debate on this issue (futile), neither am I calling
you irrational. Perhaps your choice is the same as that author's.
Cheers,
- Alf
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* MRAB, on 12.07.2010 00:37:
Alf P. Steinbach /Usenet wrote:
* Stephen Hansen, on 11.07.2010 21:00:
On 7/11/10 11:45 AM, wheres pythonmonks wrote:
Follow-up:
Is there a way to define compile-time constants in python and have the
bytecode compiler optimize away expressions like
* Stephen Hansen, on 12.07.2010 04:02:
On 7/11/10 6:12 PM, Alf P. Steinbach /Usenet wrote:
However, as stated up-thread, I do not expect facts, logic or general
reasoning to have any effect whatsoever on such hard-core religious
beliefs.
Grow up, and/or get a grip, and/or get over yourself
* MRAB, on 12.07.2010 04:09:
Alf P. Steinbach /Usenet wrote:
* MRAB, on 12.07.2010 00:37:
Alf P. Steinbach /Usenet wrote:
* Stephen Hansen, on 11.07.2010 21:00:
On 7/11/10 11:45 AM, wheres pythonmonks wrote:
Follow-up:
Is there a way to define compile-time constants in python and have
module
name but instead something like xxmodule or _csv?
More to the point, what's the point?
Cheers,
- Alf
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in triplicate - Old jungle proverb
Cheers,
- Alf
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) \
CPPY_MODULE_CROUTINE_DEF( cppClassName, name ) \
CPPY_MODULE_CROUTINE_INSTALLDATA( cppClassName, name, docString )
/code
TIA.,
- Alf
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in Windows the Notepad++ and PSPad and old Crimson Editor (all
free) all work nicely and are reasonably light-weight.
Cheers hth.,
- Alf
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* Ian Collins, on 09.07.2010 23:22:
On 07/10/10 03:52 AM, Alf P. Steinbach /Usenet wrote:
[Cross-posted comp.lang.python and comp.lang.c++]
I lack experience with shared libraries in *nix and so I need to ask...
This is about cppy, some support for writing Python extensions in C++
that I just
++ plus Python
// A simple C++ framework for writing Python 3.x extensions.
//
// Copyright (C) Alf P. Steinbach, 2010.
#ifndef CPPY_MODULE_H
#define CPPY_MODULE_H
#include progrock/cppx/devsupport/better_experience.h
//- Dependencies:
#include Ptr.h
-wish finalization callback. Nice!
But I think that could be more clear in the docs...
Code, for those who might be interested:
code
// progrock.cppy -- C++ plus Python
// A simple C++ framework for writing Python 3.x extensions.
//
// Copyright (C) Alf P. Steinbach, 2010.
#ifndef
employed that solution
before, and so I wouldn't trust the result, and wouldn't waste the time trying.
Cheers,
- Alf
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* sturlamolden, on 07.07.2010 21:12:
On 7 Jul, 06:54, Alf P. Steinbach /Usenetalf.p.steinbach
+use...@gmail.com wrote:
PyAPI_FUNC(void *) PyMem_Malloc(size_t);
#define PyMem_MALLOC(n) (((n) 0 || (n) PY_SSIZE_T_MAX) ? NULL \
: malloc((n) ? (n) : 1
* sturlamolden, on 07.07.2010 21:46:
On 7 Jul, 21:41, Alf P. Steinbach /Usenetalf.p.steinbach
+use...@gmail.com wrote:
You still have two CRTs linked into the same process.
So?
CRT resources cannot be shared across CRT borders. That is the
problem. Multiple CRTs are not a problem if CRT
is risky.
Oh.
Well then. :-)
Cheers,
- Alf
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the clue here is that the CRT state problems can be avoided by
careful coding.
Hence, for those who cannot do A I think B is a realistic practical option, and
D would be nice...
Cheers,
- Alf
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* Alf P. Steinbach /Usenet, on 07.07.2010 23:19:
However developing an extension with MSVC 10 the extension will use the
10.0 CRT, which is not necessarily present on the end user's system.
As I see it there are five solutions with different trade-offs:
A Already having Visual Studio 2008
* rantingrick, on 07.07.2010 07:42:
On Jul 6, 9:11 pm, Alf P. Steinbach /Usenetalf.p.steinbach
+use...@gmail.com wrote:
pyni! Pronounced like tiny! Yay!
hmm, how's about an alternate spelling... pyknee, or pynee, or
pynie ... considering those are not taken either?
Hm, for pure shock
* Alf P. Steinbach /Usenet, on 08.07.2010 01:47:
enum DoAddRef { doAddRef };
class Ptr
{
private:
PyObject* p_;
public:
Ptr( PyObject* p = 0 ): p_( p )
{}
Ptr( PyObject* p, DoAddRef ): p_( p )
{
assert( p
?
Cheers,
- Alf
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compiler you use,
although it's many many years since I've done JNI things. Similarly, Python
should IMHO just have a well defined compiler independent native code interface,
e.g. PNI, or pynacoin, the PYthon NAtive COde INterface :-)
Cheers,
- Alf
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like tiny! Yay!
I sat down and made my first Python extension module, following the tutorial in
the docs. It worked!
But, wait, perhaps some other extension is already named piny?
Google.
url: http://code.google.com/p/pyni/, PyNI is [a] config file reader/writer.
Argh!
- Alf
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of automatically downloading from python.org, or perhaps direct
from Microsoft. This scheme would support dependencies on new runtime lib
versions not yet conceived when the user's version of Python was installed.
Cheers,
- Alf
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* Steven D'Aprano, on 03.07.2010 16:24:
On Sat, 03 Jul 2010 08:46:57 -0400, D'Arcy J.M. Cain wrote:
On Fri, 02 Jul 2010 22:40:34 -0700
John Naglena...@animats.com wrote:
Not according to Vex's published package list:
http://www.vex.net/info/tech/pkglist/
Hold on. That *is*
):
return arg2
o = Thing()
print( o.test1( 1.11 ) )
print( o.test2( 2.22 ) )
/code
Cheers hth.,
- Alf
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).
Then the answer is to introduce some classes and OOP stuff.
In essence, instead of letting general routines awkwardly and error-prone choose
the right type-specific routines depending on the object, let the object specify
the right type-specific routines directly. :-)
Cheers hth.,
- Alf
):
p.stdin.write(%d\n % n)
result = p.stdout.readline().strip()
results.write('double(%s) = %2s\n' % (n, result))
results.close()
--- end of call_double.pyw ---
--- double.rb ---
while true
puts $stdin.gets().strip!.to_i * 2
STDOUT.flush
end
Cheers hth.,
- Alf
overriden __getitem__/__setitem__ methods (an
optimization, surely). I'm afraid it will be hard to intercept global
variable usage in these circumstances.
Great exposition.
But who would have thunk that Python *isn't dynamic enough*? :-)
Cheers,
- Alf
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an ordinary e-mail client. What's that called, POP
protocol? I think the protocol for sending is SMTP. Any library handling those
two protocols can be used.
Cheers hth.,
- Alf, who, unfortunately, wrt. to your real code, is not a telepath :-)
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much the same thing. Python has
Guido, C++ has Bjarne. In both cases the original language was designed
single-handedly by the god. And in both cases it's now essentially
design-by-committee.
Cheers,
- Alf
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the effective presentation area size is (seems to be) 400x300 pixels.
Cheers hth.,
- Alf
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* Dodo, on 07.06.2010 12:38:
Le 05/06/2010 19:07, Alf P. Steinbach a écrit :
* Dodo, on 05.06.2010 15:46:
Hi,
let's consider this exemple :
from tkinter import *
from tkinter.ttk import *
class First:
def __init__(self):
self.root = Tk()
B = Button(self.root, command=self.op)
B.pack
RAM...
Cheers,
- Alf
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'mainloop' suffices (all it does
is to dispatch messages to handlers, such as your button press callback).
So, just place a single call to 'mainloop' at the end of your program. Remove
the calls in 'First' and 'Second'.
Cheers hth.,
- Alf
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only on dates divisible by cinnamon?.
It's rather difficult to answer.
I guess it's back to basics: read up on classes, instances, constructors.
Experiment, create a lot of small programs. Don't think about exceptions just
yet: you lack the fundamentals.
Cheers hth.,
- Alf
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it already is a web forum.
Cheers hth.,
- Alf
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the decisions to make it
that way, want it that way.
Cheers,
- Alf
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not going to pay for the privilege of commenting on articles.
Cheers hth.,
- Alf
PS: How come that when I post a blog entry proving mathematically that the
reader is really really smart, the number of views dropped like a stone? Huh.
But OK, it was just a late-night posting, I couldn't
. :-)
Cheers hth.,
- Alf
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the domain
of a special purpose library.
The question then boils down to which GUI libraries your image/rich text library
is compatible with.
Perhaps if someone else has handled that combination they'll chime in.
Cheers hth.,
- Alf
PS: Tkinter on its own does not provide image resizing
different id's for the same value.
Cheers hth.,
- Alf
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automatic update magic via something-something), then I don't know.
Would be very happy for any hints.
Just update the widget whenever you change the text.
Cheers hth.,
- Alf
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to trace the actual commands and responses.
Cheers hth.,
- Alf
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There are also other ways.
Cheers hth.,
- Alf
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a
lock for hours seems ungood to me).
Cheers hth.,
- Alf
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* Terry Reedy:
* Alf P. Steinbach:
* Aahz:
and sometimes
they rebind the original target to the same object.
At the Python level that seems to be an undetectable null-operation.
If you try t=(1,2,3); t[1]+=3, if very much matters that a rebind occurs.
Testing:
test lang=py3
t
).
Agreed, at the Python level one doesn't in general have the necessary
information to do it safely. Nothwithstanding the current CPython and Jython
documentation error of sys.getrefcount (or whatever the name was) that indicates
that it's available in any implementation.
Cheers,
- Alf
, to be meaningless.
Cheers,
- Alf
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On 30.04.2010 12:51, * Lie Ryan:
On 04/30/10 12:07, Alf P. Steinbach wrote:
On 30.04.2010 01:29, * Carl Banks:
On Apr 28, 11:16 am, Alf P. Steinbachal...@start.no wrote:
On 28.04.2010 18:54, * Lie Ryan:
Python have triple-quoted string when you want to include large amount
of text;
Yes
On 30.04.2010 19:31, * Lie Ryan:
On 05/01/10 00:01, Alf P. Steinbach wrote:
On 30.04.2010 12:51, * Lie Ryan:
On 04/30/10 12:07, Alf P. Steinbach wrote:
On 30.04.2010 01:29, * Carl Banks:
On Apr 28, 11:16 am, Alf P. Steinbachal...@start.nowrote:
On 28.04.2010 18:54, * Lie Ryan:
Python
On 30.04.2010 21:46, * Lie Ryan:
On 05/01/10 05:43, Lie Ryan wrote:
On 05/01/10 03:56, Alf P. Steinbach wrote:
Use triple-quoted, let them flow, done. I've never heard of any text
editor in current use without text wrapping capability, even Notepad has
it. And if I've got 5k of text
a potato into the tailpipe
of your Chevrolet.
The point is, what you're suggesting doesn't save work at all
as you've shown it. There are other ways to do the same thing,
for virtually no work at all.
Don't put big text dumps in your program. Problem solved!
Alf suggested it, not me
On 30.04.2010 01:29, * Carl Banks:
On Apr 28, 11:16 am, Alf P. Steinbachal...@start.no wrote:
On 28.04.2010 18:54, * Lie Ryan:
Python have triple-quoted string when you want to include large amount
of text;
Yes, that's been mentioned umpteen times in this thread, including the *very
first
)
for line in lines:
parts = line.split()
if len( parts ) 0:
try:
v = int( parts[0] )
print( OK + line )
except ValueError:
print( ! + line )
/code
Cheers hth.,
- Alf
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On 28.04.2010 18:54, * Lie Ryan:
On 04/28/10 15:34, Alf P. Steinbach wrote:
On 28.04.2010 07:11, * Sagar K:
Use triple quote:
d = this is
a sample text
which does
not mean
anything
goldtechgoldt...@worldpost.com wrote in message
news:4e25733e-eafa-477b-a84d-a64d139f7
called '{}'!.format(
info.function )
print( s )
bar = foo
del foo
bar()
/code
output
Pleased to meet you, I was originally called 'foo'!
/output
But as mentioned, I'd personally choose a real object instead of a bare
function.
Cheers hth.,
- Alf
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and pasted from Wikipedia, and subjected to a few well
chosen keystrokes in an editor.
As a hopefully illuminating exercise, consider a Python program that uses this
string (just import the above module and use its 'text') and generates the above
source code as output.
Cheers hth.,
- Alf
to a character under python 3, not
Unicode.
How can I do that?
Just use chr().
ASCII (7-bit) is a subset of ISO Latin-1 (7-bit), which is a subset of Unicode's
Basic Multilingual Plane (BMP, original Unicode, 16-bit) which is a subset of
Unicode (21-bit).
Cheers hth.,
- Alf
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On 26.04.2010 22:26, * Dodo:
Le 26/04/2010 22:26, Alf P. Steinbach a écrit :
On 26.04.2010 22:12, * Dodo:
Hi all,
Under python 2.6, chr() Return a string of one character whose ASCII
code is the integer i. (quoted from docs.python.org)
Under python 3.1, chr() Return the string of one character
disabled by default.
This option may be re-enabled by the project by placing a file with the name
.htaccess with this line:
Options +Indexes
/result
Cheers hth.,
- Alf
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* Steven D'Aprano:
On Fri, 23 Apr 2010 13:19:41 +0200, Alf P. Steinbach wrote:
But for a literal context-free interpretation e.g. the 'sys.getrefcount'
function is not documented as CPython only and thus an implementation
that didn't do reference counting would not be a conforming Python
in a sufficiently large system.
Cheers hth.,
- Alf
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.
Cheers hth.,
- Alf
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for
the len of the sting it include also the'%0D%0A.
My question is how i can cut the last part of the string if it is
every time different?
Try rtrim.
Cheers hth.,
- Alf
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signifies where the search starts. :-)
Cheers,
- Alf
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for a Very Long Time).
Cheers hth.,
- Alf
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by using a finally clause (low level technique).
3.2.3 Performing cleanup by using a with statement.
/contents
Comments welcome!
Cheers,
- Alf
Notes:
[1] I'm posting this only to [comp.lang.python], for now seeking feedback mainly
on the language aspects and general approach. Partially that's
I tested the reaction to typing [Ctrl C] at the first prompt. It
then displayed the first part of traceback output,
output part=1
C:\Documents and Settings\Alf sum.v4.py
This program computes the sum of two numbers A and B.
Number A, please: Traceback (most recent call last):
/output
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