Cameron Simpson wrote:
You open a file with "0" modes, so
that it is _immediately_ not writable. Other attempts to make the
lock file thus fail because of the lack of write,
I don't think that's quite right. You open it with
O_CREAT+O_EXCL, which atomically fails if the file
already exists. The
Wayne Werner wrote:
On Fri, 10 May 2013, Gregory Ewing wrote:
f = open("myfile.dat")
f.close()
data = f.read()
To clarify - you don't want a class that has functions that need to be
called in a certain order with *valid input* in order to not crash.
Exactly what does happen - a Value
On 08/11/12 12:06, Oscar Benjamin wrote:
On 7 November 2012 22:16, Joshua Landau wrote:
That said, losing:
[0] * (2, 3) == [0] * [2, 3]
would mean losing duck-typing in general.
There are precedents for this kind of thing; the
string % operator treats tuples specially, for
example.
I don't t
PyGUI 2.5 is available:
http://www.cosc.canterbury.ac.nz/greg.ewing/python_gui/
Lots of new stuff in this version. Highlights include:
- Improved facilities for customising the standard menus.
- Functions for creating PyGUI Images from PIL images and numpy arrays.
- ListButton - a pop
PyGUI 2.5.3 is available:
http://www.cosc.canterbury.ac.nz/greg.ewing/python_gui/
Clipboard access now implemented on MacOSX, plus a few
bug fixes.
What is PyGUI?
--
PyGUI is a cross-platform GUI toolkit designed to be lightweight
and have a highly Pythonic API.
--
Gregory Ewin
PyGUI 2.4 is available:
http://www.cosc.canterbury.ac.nz/greg.ewing/python_gui/
Highlights of this release:
* Python 3 Compatible on MacOSX and Windows.
* ScrollableView has been overhauled on Windows and should now
work with all builds of pywin32 as far as I know.
What is PyGUI?
---
D'Arcy J.M. Cain wrote:
On Sun, 17 Apr 2011 16:21:53 +1200
Gregory Ewing wrote:
def get_from_cache(x):
y = cache.get(x)
if not y:
y = compute_from(x)
cache[x] = y
return y
I prefer not to create and destroy objects needlessly.
How does that create objects needless
for the Sketchup 3D modelling application
that lets you script it in Python.
--
Greg Ewing
greg.ew...@canterbury.ac.nz
--
http://mail.python.org/mailman/listinfo/python-list
Cameron Simpson wrote:
Unless one had a misfortune and wanted another docstring.
Good point. I guess having differing docstrings should make
otherwise equal objects ineligible for merging.
mod1.py:
MAX_BUFSIZE = 8192
MAX_BUFSIZE.__doc__ = 'Size of the hardware buffer used for I/O on
t
On 17/04/22 9:17 am, Karsten Hilbert wrote:
Take this medication for 1 month !
is quite likely to mean "take it for 28 days".
Except when your doctor prescribes 90 days worth of tablets,
they come boxes of 84 (6 cards * 14 tablets), and the pharmacist
dutifully opens a box, cuts off an
On 21/04/22 6:22 am, Abdur-Rahmaan Janhangeer wrote:
Using Python3.9, i cannot assign a list [1, 2] as key
to a dictionary. Why is that so?
If the contents of the list were to change after using it as
a key, its hash value would no longer match its position in
the dict, so subsequent lookups co
On 21/04/22 8:18 am, Avi Gross wrote:
I am thinking as an example about a program I wrote ages ago that deals with
equations in symbolic form and maintains a collection of forms of the equation
it is trying to take a derivative or integral of by applying an assortment of
typographic rules.
I
On 22/04/22 5:09 am, Chris Angelico wrote:
This can't be your complete code, because it won't run like this.
Also, the output you showed contains blank lines and lines
with hyphens, and there is nothing in the code you posted
which does that.
If I had to guess, I'd say you have a loop which is
On 20/04/22 10:57 pm, Sam Ezeh wrote:
Has anyone here used or attempted to use a nested class inside an enum?
If so, how did you find it? (what did you expect to happen and did
your expectations align with resulting behaviour etc.)
That's a pretty open-ended question. Is there something about
On 7/05/22 12:27 pm, Stefan Ram wrote:
But when you read descriptions in books about phonology about
how the mouth and tongue is positioned to produce certain
sounds and see pictures of this, your faulty ears are bypassed
and you get a chance to produce the correct sounds of the
fo
On 7/05/22 12:22 am, Jonathan Kaczynski wrote:
Stepping through the code with gdb, we see it jump from the compare
operator to the dunder-eq method on the UUID object. What I want to be able
to do is explain the in-between steps.
Generally what happens with infix operators is that the interpret
On 9/05/22 7:47 am, Marco Sulla wrote:
It will fail if the contents is not ASCII.
Why?
For some encodings, if you seek to an arbitrary byte position and
then read, it may *appear* to succeed but give you complete gibberish.
Your method might work for a certain subset of encodings (those that
On 16/05/22 1:20 am, 2qdxy4rzwzuui...@potatochowder.com wrote:
IMO,
classmethods were/are a bad idea (yes, I'm probably in the minority
around here, but someone has to be).
I don't think class methods are a bad idea per se, but having
them visible through instances seems unnecessary and confusi
On 5/06/22 10:07 am, dn wrote:
On 05/06/2022 09.50, Chris Angelico wrote:
min(enumerate(l), key=lambda x: x[1])
(0, 1.618033)
But, but, but which of the above characters is an 'el' and which a 'one'???
(please have pity on us old f...s and the visually-challenged!)
ell = l
one = 1
min(enum
On 8/06/22 10:26 pm, Jon Ribbens wrote:
Here's a head-start on some characters you might want to translate,
Another possibility that might make sense in this case is to simply
strip out all punctuation before comparing. That would take care of
things being spelled with or without hyphens, comma
On 9/06/22 5:55 am, Dennis Lee Bieber wrote:
There are no mutable strings in Python.
If you really want a mutable sequence of characters, you can
use array.array, but you won't be able to use it directly in
place of a string in most contexts.
--
Greg
--
https://mail.python.org/mailma
Another possibility is to use reportlab to generate a pdf.
--
Greg
--
https://mail.python.org/mailman/listinfo/python-list
On 15/06/22 7:49 am, Chris Angelico wrote:
If it does need to be used as a module as well as a script, sure. But
(a) not everything does, and (b) even then, you don't need a main()
I think this is very much a matter of taste. Personally I find it tidier
to put the top level code in a function,
On 21/06/22 2:52 pm, Avi Gross wrote:
This leads to the extremely important question of what would an implementation
of Python, written completely in C++, be called?
(Pronounced with a comical stutter) "C-p-p-python!")
--
Greg
--
https://mail.python.org/mailman/listinfo/python-list
On 21/06/22 2:38 pm, Paulo da Silva wrote:
Notice that they are, for example, Jython and not JPython.
Jython *was* originally called JPython, but that was judged to be
a trademark violation and they were made to change it.
I don't know how MicroPython has escaped the same fate to date.
--
Gre
On 21/06/22 2:56 pm, Paulo da Silva wrote:
Let's say they reimplement "reference python" CPython in Rust. What is
better? Change the "reference python" CPython name to RPython, for
example, or let it as CPython?
The C implementation would still be called CPython, and the new
implementation mig
On 21/06/22 9:27 pm, Paul Rubin wrote:
What? I never heard of such a dispute. The PSF got after someone about
it? Sheesh.
Upon further research, it seems it wasn't the *Python* trademark that
was at issue. From the Jython FAQ page:
1.2 How does Jython relate to JPython?
Jython is the su
On 21/06/22 8:37 pm, Christian Gollwitzer wrote:
Am 20.06.22 um 22:47 schrieb Roel Schroeven:
"CPython is a descendant of Pyscript built on Pyodide, a port of
CPython, or a Python distribution for the browser and Node.js that is
based on Webassembly and Emscripten."
To me, this sentence is so
On 22/06/22 4:42 am, MRAB wrote:
On 2022-06-21 03:52, Avi Gross via Python-list wrote:
This leads to the extremely important question of what would an
implementation of Python, written completely in C++, be called?
C++Python
CPython++
C+Python+
DPython
SeaPython?
SeeSeaSiPython
CincPython?
On 8/09/22 6:57 am, Chris Angelico wrote:
Not as detrimental as starting with BASIC, and then moving on to x86
assembly language, and trying to massage the two together using CALL
ABSOLUTE in order to get mouse input in your GW-BASIC programs.
Or starting with hand-assembled SC/MP machine code
On 1/10/22 8:18 am, MRAB wrote:
It's OK to INCREF them, provided that you DECREF them when you no longer
need them, and remember that if it's a "new reference" you'd need to
DECREF it twice.
Which means there would usually be no point in doing the extra
INCREF/DECREF. You still need to know wh
On 4/10/22 10:49 pm, 2qdxy4rzwzuui...@potatochowder.com wrote:
(I could even move
the file to another folder on the original Mac, but that didn't mean
much, because those old file systems were entirely flat (directories and
folders were an illusion maintained by the Finder)
That was only true i
On 2/11/22 9:54 am, Julieta Shem wrote:
But we've left behind a more basic requirement --- the Stack
class wishes for all the methods already written in some class called
Pair,
Is that *really* what you want, though?
To my way of thinking, a Stack and a Pair are quite different
data structures
On 3/11/22 1:37 pm, Julieta Shem wrote:
The code for computing the length of a Pair (which is really a linked
list) happens to be the same for computing the length of a Stack.
I would question whether that should be a method of Pair at all,
since it's not the length of the pair itself, but the
On 4/11/22 1:29 am, Julieta Shem wrote:
Perhaps I can reduce the
class Pair to just being a pair as we know it, made of two things, then
we create a class called Sequence, which is really a composition of
Pairs, comes with a length method and we derive Stack from it.
That sounds better. But be
On 4/11/22 12:50 am, Chris Angelico wrote:
In Python, everything is an object. Doesn't that equally mean that
Python is purely OOP?
Depends on what you mean by "purely oop". To me it suggests a
language in which dynamically-dispatched methods are the only
form of code. Python is not one of thos
r...@zedat.fu-berlin.de (Stefan Ram) writes [that Barbara Liskov said]:
|If for each object o1 of type S there is an object o2 of
|type T such that for all programs P defined in terms of T,
|the behavior of P is unchanged when o1 is substituted for o2
|then S is a subtype of T.
That seems over
On 4/11/22 7:51 am, Julieta Shem wrote:
(The empty documentation seems to satisfy the principle.)
All the more reason to document your classes!
More seriously, there's always at least a (possibly fuzzily) implied
contract, because of the names you choose for things if nothing else.
--
Greg
-
On 5/11/22 4:25 am, Chris Angelico wrote:
Maybe it's one of those terms that is useless for actual coding
(because practicality beats purity), but good for discussions?
I'm not sure it's much good for discussions, either. I don't
really care whether a language is "purely OO" or not, whatever
th
On 14/11/22 1:31 pm, Jon Ribbens wrote:
On 2022-11-13, DFS wrote:
But why is it allowed in the first place?
Because it's an expression, and you're allowed to execute expressions.
To put it a bit more clearly, you're allowed to evaluate
an expression and ignore the result.
--
Greg
--
https
On 14/11/22 3:13 pm, MRAB wrote:
But if it's an expression where it's expecting a statement and it's not
a call, then it's probably a bug.
The key word there is "probably". If there's any chance it
could be not a bug, it can't be an error. At most it should
be a warning, and that's what linters
On 19/12/22 6:35 am, Paul St George wrote:
So I am working on a physics paper with a colleague. We have a theory about
Newtons Cradle.
We want to illustrate the paper with animations.
Because there is a problem, I am investigating in all areas. ... I would like
to be in control of or fully aw
On 19/12/22 9:24 am, Stefan Ram wrote:
So what's the time until a mass of one gram
arrives at the ground versus a mass of ten grams? I think
one needs "Decimal" to calculate this!
Or you can be smarter about how you calculate it.
Differentiating t with respect to m gives
dt/dm = -0.5 * sqr
On 1/01/23 11:36 am, avi.e.gr...@gmail.com wrote:
And, of course, we had the philosophical question of why the feature was
designed to not return anything ... rather than return the changed
object.
My understanding is that Guido designed it that way to keep a
clear separation between mutating a
On 11/01/23 11:21 am, Jen Kris wrote:
where one object derives from another object (a = b[0], for example), any
operation that would alter one will alter the other.
I think you're still confused. In C terms, after a = b[0], a and b[0]
are pointers to the same block of memory. If you change tha
On 16/01/23 2:27 am, Dino wrote:
Do you have any idea about the speed of a SELECT query against a 100k
rows / 300 Mb Sqlite db?
That depends entirely on the nature of the query and how the
data is indexed. If it's indexed in a way that allows sqlite to
home in directly on the wanted data, it wi
On 19/01/23 10:40 am, Dan Kolis wrote:
I guess I don't full understand what bothers me about the repetition of the
imports so much.
It's doubtful that every module uses every one of those imports.
It looks like someone had a standard block of imports that they
blindly pasted at the top of ever
On 2023-01-22 at 18:19:13 -0800,
Jach Feng wrote:
1) Modify the sys.argv by inserting an item '--' before parsing it, ie.
sys.argv.insert(1, '--')
args = parser.parse_args()
If you do that, you'll never be able to have any actual options, so
using argparse seems like overkill. Just pull the ar
On 26/01/23 6:10 am, Chris Angelico wrote:
And that's a consequence of a system wherein there is only one concept
of "success", but many concepts of "failure". Whoever devised that
system was clearly a pessimist :)
Murphy's Law for Unix: If something can go wrong, it will go
wrong 255 times out
On 30/01/23 10:41 pm, mutt...@dastardlyhq.com wrote:
What was the point of the upheaval of converting
the print command in python 2 into a function in python 3 if as a function
print() doesn't return anything useful?
It was made a function because there's no good reason for it
to have special s
On 31/01/23 10:24 pm, mutt...@dastardlyhq.com wrote:
All languages have their ugly corners due to initial design mistakes and/or
constraints. Eg: java with the special behaviour of its string class, C++
with "=0" pure virtual declaration. But they don't dump them and make all old
code suddenly ce
On 1/02/23 7:33 am, Stefan Ram wrote:
Thomas Passin writes:
Some people say it is a function now so that you can redefine it.
Well, that's one benefit, but I wouldn't say it's the main one.
The point is really that you can do *anything* with it now that
you can do with a regular functio
On 1/02/23 1:17 pm, dn wrote:
1 nothing "ceased to execute" and Python 2 was maintained and developed
for quite some time and in-parallel to many Python 3 releases.
And a lot of effort was put into making the transition as easy
as possible, e.g. 2to3, and the features added to 2.7 to make
it ea
On 3/02/23 6:38 am, Jon Ribbens wrote:
If you change someone else's code then you have created a derived
work, which requires permission from both the original author and you
to copy. (Unless you change it so much that nothing remains of the
original author's code, of course.)
"Nothing" is prob
On 3/02/23 5:09 am, mutt...@dastardlyhq.com wrote:
What if its 10s of thousands of lines of
core production code? If the company it belongs to wants to add new Python 3
features it can't just plug them into the code because it won't run under
Python 3, they have to do a full overhaul or even comp
On 13/01/21 7:13 am, Chris Angelico wrote:
This is what different actions are for. I'd probably use
action="store_true" here; that should mean that args.register will be
set to True if "-r" was passed, or False if it wasn't.
Yes, otherwise it expects another argument following -r
containing a
On 13/01/21 4:18 am, Grant Edwards wrote:
AFAIK, Python can't be used to write device drivers for any popular OS
At least not until some crazy person embeds Python in the
Linux kernel...
--
Greg
--
https://mail.python.org/mailman/listinfo/python-list
On 13/01/21 7:57 pm, Christian Gollwitzer wrote:
What do you mean, "until" ?
https://medium.com/@yon.goldschmidt/running-python-in-the-linux-kernel-7cbcbd44503c
He's using Micropython. That's cheating! :-)
--
Greg
--
https://mail.python.org/mailman/listinfo/python-list
On 14/01/21 11:09 am, Grant Edwards wrote:
Perhaps I need to recalibrate my adjectives, but with
256KB+ of flash and 32KB+ of RAM, I wouldn't call them "small"
It's small by today's standards, when you consider that
multiple GB of RAM is commonplace now in most "real" computers.
--
Greg
--
htt
On 14/01/21 1:58 pm, Chris Angelico wrote:
On Thu, Jan 14, 2021 at 11:53 AM Python wrote:
I believe it is or was quite common
for large, integrated applications like DAWs, graphical design
software, etc. to remember where you placed your various floating
toolbars and add-ons
Not just large,
Aother thing to consider is that math.sqrt is not the only
sqrt function in Python. There is also one in cmath, and
in the wider ecosystem, another one in numpy. Being explicit
about which one you're using is a good thing.
Concerning exponentiation, it can be used to achieve the same
thing as sqr
On 14/01/21 11:49 am, Cameron Simpson wrote:
The "pure" OOP approach, where method calls are used as messages to set
or fetch aspects of the object, is usually does with getter and setter
methods like:
x = o.getX()
o.setX(9)
People use get and set methods, not because it's somehow mo
On 16/01/21 7:33 am, Grant Edwards wrote:
Starting in Python 3., python's stdio file objects are _not_
on top of the libc FILE streams: they're directly on top of the file
descriptor.
This sounds like rather a bad situation, because it means that
any C library using stdio is going to interact b
On 16/01/21 10:14 am, Michael F. Stemper wrote:
I had no idea that syntax existed, and find it completely at odds
with The Zen of Python.
It's not an *obvious* way, so there's no Zen conflict.
As for why it exists, it's part of the mechanism that implements
imports -- 'import' statements get c
On 16/01/21 3:37 pm, Chris Angelico wrote:
Surely it should be the other way around? If you use the C stdio
streams, flush them after use.
1. You might not know that you're (implicitly) using C stdio.
2. There doesn't seem to be an easy way to flush C stdio from
Python any more.
--
Greg
--
ht
On 16/01/21 4:17 pm, Chris Angelico wrote:
But somewhere along the way, you're finding that there's a problem,
which implies that SOMETHING is calling on C stdio. That thing,
surely, should be the thing responsible for flushing?
The C library using stdio has no way of knowing that something
els
On 17/01/21 12:40 pm, Chris Angelico wrote:
This is true. However, at some point, the boundary is crossed from
Python into the C library. Something, at that point, knows. It's very
common to have a flush option available, so it should be used.
I'm wondering whether the problem in this particula
On 18/01/21 3:34 am, Alan Gauld wrote:
The problem is terminfo is not really part of curses.
Curses is built on top of terminfo.
As far as I can tell from the man pages, terminfo itself
is just a file format. The only programmatic interfaces I
can find for it *are* part of curses:
del_curterm(
On 19/01/21 2:34 pm, Alan Gauld wrote:
To be fair that's a limitation of the C curses library. putp() is a
wrapper around tputs() even there, and you can't change what it does.
The gap in the curses module is that it doesn't offer the tputs()
option as an alternative.
Seems to me it would be us
On 3/02/21 9:24 am, Dan Stromberg wrote:
But how do you know what exceptions could be raised?
Mostly I find that it's not really necessary to know precisely
which exceptions could be raised.
The way I usually deal with exceptions is:
1. If it descends from OSError, I assume it results from s
On 12/02/21 7:05 am, Andras Tantos wrote:
a = B()
a.m(41)
a.m = MethodType(method, a)
a.m(42)
Are you sure you really need to inject methods into instances
like this? What problem are you trying to solve by doing so?
There's almost certainly a better way to approach it.
--
On 12/02/21 11:33 am, Mr Flibble wrote:
neos isn't a Python package so that isn't a problem.
It might be a bit confusing if it ever becomes part of the
wider Python ecosystem, though.
--
Greg
--
https://mail.python.org/mailman/listinfo/python-list
On 12/02/21 3:39 pm, Andras Tantos wrote:
Now, when a Port gets assigned a NetType, it needs to gain all sorts of
new features. It for example should have a 'length' attribute that tells
how many bits are needed to represent its possible values.
The way I would probably approach this is to hav
On 28/02/21 1:17 pm, Cameron Simpson wrote:
[its length in bytes] is presented via the object's __len__ method,
BUT... It also has a __iter__ value, which like any Box iterates over
the subboxes.
You're misusing __len__ here. If an object is iterable and
also has a __len__, its __len__ shoul
On 3/03/21 12:24 pm, Chris Angelico wrote:
if PRODUCTION:
def assert(*a, **kw): pass
would work if it were a function :)
But would cost you a useless function call for every assert
in production mode.
--
Greg
--
https://mail.python.org/mailman/listinfo/python-list
On 31/03/21 7:37 pm, dn wrote:
Python offers mutable (can be changed) and immutable (can't) objects
(remember: 'everything is an object'):
https://docs.python.org/3/reference/datamodel.html?highlight=mutable%20data
While that's true, it's actually irrelevant to this situation.
$ a = "bob"
On 3/04/21 10:36 am, Chris Angelico wrote:
It means exactly what you'd expect. The tricky part comes when you try
to knife the block of chocolate, and it makes for a hilarious party
game.
A guillotine could be useful in the case of Whittaker's.
IMO they don't make the grooves deep enough, makin
On 5/04/21 11:47 am, dn wrote:
I think I've read that the compiler is smart-enough to realise that the
RHS 'literal-tuples'?'tuple-literals' are being used as a 'mechanism',
and thus the inits are in-lined.
It does indeed seem to do this in some cases:
>>> def g(i, j, k):
... a, b, c = i, j,
On 6/04/21 4:02 am, Terry Reedy wrote:
*Any* use of 'yield' in a function makes the function a generator
function. ... If there were a 'dead
(unreachable) code' exception, a reader or compiler would have to
analyze each use of 'yield' and decide whether it is reachable or not.
It would als
On 6/05/21 12:58 am, Peter Otten wrote:
Does that happen with all my messages?
I've seen two pairs of duplicate messages from you in this
thread so far, with the same content but slightly different
line wrapping. Looks like a gateway somewhere isn't recognising
them as the same message.
Readin
My opinion on all this: The volume in this newsgroup is nowhere
near high enough to be worth changing anything.
This thread itself now contains more messages than the recent
neopython trollage that prompted it.
--
Greg
--
https://mail.python.org/mailman/listinfo/python-list
On 25/05/21 9:27 am, Cameron Simpson wrote:
On 24May2021 16:17, hw wrote:
>
Or it doesn't forget
about the old one and the old one becomes inaccessible (unless you
have a reference to it, if there is such a thing in python). How do
you call that?
You're conflating values
(objects, such as a
On 25/05/21 2:59 pm, hw wrote:
Then what is 'float' in the case of isinstance() as the second
parameter, and why can't python figure out what 'float' refers to in
this case?
You seem to be asking for names to be interpreted differently
when they are used as parameters to certain functions.
On 25/05/21 5:56 pm, Avi Gross wrote:
Var = read in something from a file and make some structure like a data.frame
Var = remove some columns from the above thing pointed to by Var
Var = make some new calculated columns ditto
Var = remove some rows ...
Var = set some kind of grouping on the above
On 26/05/21 3:33 am, Dennis Lee Bieber wrote:
the OBJECTS have a type and can not change type.
Well... built-in types can't, but...
>>> class A:
... pass
...
>>> class B:
... pass
...
>>> a = A()
>>> type(a)
>>> a.__class__ = B
>>> type(a)
--
Greg
--
https://mail.python.org/mailman/listi
On 26/05/21 5:21 am, hw wrote:
On 5/25/21 11:38 AM, Cameron Simpson wrote:
You'll need to import "sys".
aving to import another library just to end a program
might not be ideal.
The sys module is built-in, so the import isn't really
loading anything, it's just giving you access to a
namespa
On 2021-05-24, Alan Gauld via Python-list wrote:
Although wouldn't it be "expected boolean expression" rather than
conditional expression? Python doesn't care how the argument to 'if'
is arrived at so long as it's a boolean.
This isn't really true either. Almost every object in Python has
an
On 26/05/21 7:15 pm, hw wrote:
it could at least figure out which, the
type or the variable, to use as parameter for a function that should
specify a variable type when the name is given. Obviously, python knows
what's expected, so why not chose that.
It knows, but not until *after* the func
On 27/05/21 4:17 am, Chris Angelico wrote:
Worst case, it
is technically available as the ._fullcircle member, but I would
advise against using that if you can help it!
If you're worried about that, you could create your own
turle subclass that tracks the state how you want.
--
Greg
--
https:/
On 30/05/21 1:46 pm, dn wrote:
We always referred to it as an "oh-two-nine" ("029").
I had the privilege of helping to dismantle a couple of those
when they were decommissioned at the University of Canterbury.
Amazing pieces of technology -- purely electromechanical, no
electronics in sight. E
On 31/05/21 8:20 am, Alan Gauld wrote:
That's a very Pythonic description.
If it's a book about Python, it needs to be. The word "property"
has a very specialised meaning in Python.
In some other languages it's used the way we use "attribute" in
Python. So a Python-specific definition is nece
On 31/05/21 4:57 am, Irv Kalb wrote:
Perhaps the best I've found so far is from the Python documentation:
A property object has getter, setter, and deleter methods usable as decorators
that create a copy of the property with the corresponding accessor function set
to the decorated function.
On 31/05/21 9:13 am, Jon Ribbens wrote:
No, I said it pretends to be a *data* attribute.
I don't think it's pretending to be anything. From the outside,
it's just an attribute.
Data attributes are more common than non-data attributes, so
we tend to assume that an attribute is a data attribute
On 1/06/21 2:34 am, Jon Ribbens wrote:
From the outside, it's just a *data* attribute. Which, from the inside,
it isn't. Hence "pretending".
But what is it about the external appearance that would make
you think it's a data attribute, rather than some other kind
of attribute?
(I'm assuming th
On 1/06/21 7:01 am, Alan Gauld wrote:
That was the point, the OP said it was a book about OOP.
Not a book about "OOP in Python".
In that case it would be best to avoid the word, or give
a definition of the way he's using it, making it clear
that it's not a universal definition. Python's definit
On 14/06/21 4:19 am, BlindAnagram wrote:
Am I missing the obvious way to obtain the value (or the key) from a
dictionary that is known to hold only one item?
v = d.popitem()[1]
More importantly, is there a good reason why we don't have d.pop() for
dictionaries?
My guess is because it's not
On 14/06/21 4:15 am, Elena wrote:
Given a dataset of X={(x1... x10)} I can calculate Y=f(X) where f is this
rule-based function.
I know an operator g that can calculate a real value from Y: e = g(Y)
g is too complex to be written analytically.
I would like to find a set of rules f able to minim
On 13/06/21 3:21 pm, dn wrote:
Will referring to
skilled professionals as 'masters (of their profession/craft)'
transgress (international or at least US-instigated) 'Political
Correctness'?
And what about all the university degrees with the word
"master" in their names?
Worst of all, will epis
On 15/06/21 12:51 am, Elena wrote:
I see what you mean, so I try to explain it better: Y is a vector say [y1,
y2, ... yn], with large (n>>10), where yi = f(Xi) with Xi = [x1i, x2i, ...
x10i] 1<=i<=n. All yi and xji assume discrete values.
I already have a dataset of X={Xi} and would like to find
On 15/06/21 3:18 pm, Jach Feng wrote:
From a user's point, I don't really care how Python creates thoseinstances, >
either using an already exist one or create a new one, as
long as each element (and its sub-element) are independent from each
other so a modification of one will not influence the
1 - 100 of 484 matches
Mail list logo
