Hi,
I'm Needing to get python 2.7.10 to cross compile correctly for an ARM
embedded device.
I'm very close, as it does build with warnings, but the result is
defective and I'm not sure how to fix it.
For some odd reason, the interpreter does run -- but I either get random
segfaults -- or if I
On 01/27/2015 02:04 AM, Gregory Ewing wrote:
Andrew Robinson wrote:
The spelling caveat is great -- and in Python the object named in
bool's honor is spelled bool (lowercase too). ;)
That doesn't change the fact that the man was called
George Boole (not Charles!). If you're going to refer
On 01/26/2015 02:22 PM, Ian Kelly wrote:
On Jan 26, 2015 6:42 AM, Andrew Robinson andr...@r3dsolutions.com
mailto:andr...@r3dsolutions.com wrote:
...
If you're going to descend into insults and name-calling, then I'm not
going to waste any more of my time on this thread.
I don't
Original Message
Subject:Re: Comparisons and sorting of a numeric class
Date: Mon, 26 Jan 2015 05:38:22 -0800
From: Andrew Robinson andr...@r3dsolutions.com
To: Steven D'Aprano steve+comp.lang.pyt...@pearwood.info
On 01/24/2015 12:27 AM, Steven D'Aprano
on here. I
seriously doubt I will ever read them all...
On 01/26/2015 08:31 AM, Mark Lawrence wrote:
On 26/01/2015 13:38, Andrew Robinson wrote:
*plonk*
Ah well, now that I have actually bothered to read your three replies, I
suppose the most surprising part of your emails is this:
-My
wrote:
On Wed, 14 Jan 2015 23:23:54 -0800
Andrew Robinson andr...@r3dsolutions.com wrote:
Boolean algebra has two values: true and false, or 1 and 0, or humpty
and dumpty, or whatever you like to call them.
You're speaking to an Electrical engineer. I know there are 10 kinds of
people, those who
On 01/15/2015 09:05 AM, Ian Kelly wrote:
On Thu, Jan 15, 2015 at 12:23 AM, Andrew Robinson
andr...@r3dsolutions.com wrote:
Can you name any other language that *does* allow subclassing of
booleans or creation of new boolean values?
Yes. Several off the top of my head -- and I have mentioned
On 01/15/2015 12:41 AM, Steven D'Aprano wrote:
On Wed, 14 Jan 2015 23:23:54 -0800, Andrew Robinson wrote:
[...]
A subclass is generally backward compatible in any event -- as it is
built upon a class, so that one can almost always revert to the base
class's meaning when desired
And most of this thread has been nothing more than me asking why
did Guido
say to do that -- and people avoiding answering the question.
Wait, are you actually asking why bool is a doubleton? If nobody has
answered that, I think probably nobody understood you were asking it,
because it
On 01/12/2015 09:32 PM, Steven D'Aprano wrote:
On Mon, 12 Jan 2015 17:59:42 -0800, Andrew Robinson wrote:
[...]
What I am wanting to know is WHY did Guido think it so important to do
that ? Why was he so focused on a strict inability to have any
instances of a bool subclass at all
On 01/07/2015 04:04 PM, Ethan Furman wrote:
On 01/06/2015 07:37 PM, Andrew Robinson wrote:
Explain; How does mere subclassing of bool break the contract that bool has?
eg: What method or data would the superclass have that my subclass would not?
bool's contract is that there are only two
On 01/12/2015 02:35 PM, Chris Angelico wrote:
On Tue, Jan 13, 2015 at 9:27 AM, Andrew Robinson
andr...@r3dsolutions.com wrote:
Huh? I'm not adding any values when I merely subclass bool ; and even if the
subclass could be instantiated -- that's doesn't mean a new value or
instance of the base
that assertion from anyway and how is it related to
Guido and formal definitions of the python language ??? Are you really
trying to imply that Guido wrote that assertion ?
On Tue, Jan 13, 2015 at 12:59 PM, Andrew Robinson
andr...@r3dsolutions.com wrote:
There is no need to copy data from
Hi,
I'm building a custom numeric class that works with values that have
uncertainty and am wanting to make it as compatible with floating point
objects as possible -- so as to be usable in legacy code with minimal
rewites; but but I am having trouble understanding how to handle
magnitude
So, I'm not sure I can subclass boolean either because that too is a
built in class ... but I'm not sure how else to make an object that
acts as boolean False, but can be differentiated from false by the 'is'
operator. It's frustrating -- what good is subclassing, if one cant
subclass all the
On 01/06/2015 05:35 AM, Chris Angelico wrote:
On Wed, Jan 7, 2015 at 12:30 AM, Andrew Robinson
andr...@r3dsolutions.com wrote:
Why this is so important to Guido, I don't know ... but it's making it VERY
difficult to add named aliases of False which will still be detected as
False and type
On 01/06/2015 06:02 AM, Dave Angel wrote:
On 01/06/2015 08:30 AM, Andrew Robinson wrote:
So, I'm not sure I can subclass boolean either because that too is a
built in class ... but I'm not sure how else to make an object that
acts as boolean False, but can be differentiated from false
On 01/06/2015 06:34 PM, Terry Reedy wrote:
On 1/6/2015 9:01 PM, Andrew Robinson wrote:
[snip]
There are very few (about 4) builtin classes that cannot be
subclassed. bool is one of those few, float is not. Go ahead and
subclass it.
class F(float): pass
F
class '__main__.F'
F(2.3
On 01/06/2015 06:31 PM, Chris Angelico wrote:
The type check issue is mostly about compatability in the first place ; eg:
users typecheck either unintentionally -- (novices syndrome) -- or because
they need all the capabilities of a given type, and the only simple way to
find out if they are
On 02/14/2013 05:23 AM, Terry Reedy wrote:
On 2/13/2013 2:00 PM, stephenw...@gmail.com wrote:
Hello,
Would it be feasible to modify the Python grammar to allow ':' to
generate slice objects everywhere rather than just indexers and
top-level tuples of indexers?
Right now in Py2.7, Py3.3:
Errata, I made a tyepopeo in the middle of the night:
eg:Python evaluates right to left; this is semantically an iterator
giving a[1],a[2],a[5],a[11]
Sigh: Python Iterates from left to right;
--Andrew.
--
http://mail.python.org/mailman/listinfo/python-list
On 02/25/2013 10:28 AM, Ian Kelly wrote:
On Sun, Feb 24, 2013 at 6:10 PM, Andrew Robinson
andrew3@xxx wrote:
I've read through the whole of the subject, and the answer is no,
although I
think allowing it in (::) is a *very* good idea, including as a
replacement
for range or xrange.
s=1:2:3
On 02/25/2013 04:54 PM, Ian Kelly wrote:
On Mon, Feb 25, 2013 at 12:41 AM, Andrew Robinson
andr...@r3dsolutions.com wrote:
Intuitively, it should result in an infinite loop starting at 0. But
ranges require a stop value for a very good reason -- it should not be
this easy to accidentally
On 02/22/2013 07:21 PM, Ian Kelly wrote:
On Fri, Feb 22, 2013 at 4:41 AM, Chris Angelico ros...@gmail.com wrote:
That's not artificial intelligence, though. It's artificial program
generation based on a known target output. The Fitness calculation
is based on a specific target string. This is
On 02/22/2013 08:23 PM, Ian Kelly wrote:
On Fri, Feb 22, 2013 at 5:09 AM, Andrew Robinson
andr...@r3dsolutions.com wrote:
On 02/22/2013 07:21 PM, Ian Kelly wrote:
I am curious about how he deals with infinite loops in the generated
programs. Probably he just kills the threads after they pass
On 02/12/2013 05:38 AM, Bqsj Sjbq wrote:
import os
os.system(i=3)
0
os.system(echo $i)
0
why i can not get the value of i?
First:
os.system is only defined to give the return value (exit code) of the
sub-process.
However, one way to get the output of shell commands is to use
Hi, I'm being forced to use import MySQLdb to access a serverand
am not getting all my data back.
I'm trying to send multiple queries all at once (for time reasons) and
then extract the rows in bulk.
The queries have different number of columns; For a contrived example;
script.db.query(
A quick question:
On xml.etree,
When I scan in a handwritten XML file, and there are mismatched tags --
it will throw an exception.
and the exception will contain a line number of the closing tag which
does not have a mate of the same kind.
Is there a way to get the line number of the
Good day :),
I've been exploring XML parsers in python; particularly:
xml.etree.cElementTree; and I'm trying to figure out how to do it
incrementally, for very large XML files -- although I don't think the
problems are restricted to incremental parsing.
First problem:
I've come across an
On 01/24/2013 06:42 AM, Stefan Behnel wrote:
Andrew Robinson, 23.01.2013 16:22:
Good day :),
Nope, you should read the manual on this. Here's a tutorial:
http://lxml.de/tutorial.html#elements-contain-text
I see, so it should be under the tail attribute, not the text
attribute. That's why I
Hi,
I have a problem which may fit in a mysql database, but which I only
have python as an alternate tool to solve... so I'd like to hear some
opinions...
I'm building a experimental content management program on a standard
Linux Web server.
And I'm needing to keep track of archived votes
On 01/18/2013 08:47 AM, Stefan Behnel wrote:
Andrew Robinson, 18.01.2013 00:59:
I have a problem which may fit in a mysql database
Everything fits in a MySQL database - not a reason to use it, though. Py2.5
and later ship with sqlite3 and if you go for an external database, why use
MySQL
On 12/18/2012 07:03 AM, Chris Angelico wrote:
On Wed, Dec 19, 2012 at 1:28 AM, Roy Smithr...@panix.com wrote:
In articlead040201-ba94-496c-bb17-7433b0e09...@googlegroups.com,
iMathredstone-c...@163.com wrote:
Download the source for the version you're interested in.
but which python
On 12/12/2012 12:29 PM, Dave Angel wrote:
On 12/12/2012 03:11 PM, Wanderer wrote:
I have a program that has a main GUI and a camera. In the main GUI,
you can manipulate the images taken by the camera. You can also use
the menu to check the camera's settings. Images are taken by the
camera in a
On 12/13/2012 06:45 PM, Steven D'Aprano wrote:
I understand this is not exactly a Python question, but it may be of
interest to other Python programmers, so I'm asking it here instead of a
more generic Linux group.
I have a Centos system which uses Python 2.4 as the system Python, so I
set an
On 12/13/2012 06:45 PM, Steven D'Aprano wrote:
What am I doing wrong?
By the way, I didn't include command line parameters as part of the
function definition, so you might want to add them to insure it acts
like a generic alias.
Also, (alternately), you could define a generic python shell
On 11/07/2012 11:09 PM, Ian Kelly wrote:
On Wed, Nov 7, 2012 at 8:13 PM, Andrew Robinson
andr...@r3dsolutions.com wrote:
OK, and is this a main use case? (I'm not saying it isn't I'm asking.)
I have no idea what is a main use case.
Well, then we can't evaluate if it's worth keeping a list
Hi IAN!
On 11/06/2012 03:52 PM, Ian Kelly wrote:
On Tue, Nov 6, 2012 at 3:41 PM, Andrew Robinson
The objection is not nonsense; you've merely misconstrued it. If
[[1,2,3]] * 4 is expected to create a mutable matrix of 1s, 2s, and
3s, then one would expect [[{}]] * 4 to create a mutable matrix
On 11/06/2012 05:55 PM, Steven D'Aprano wrote:
On Tue, 06 Nov 2012 14:41:24 -0800, Andrew Robinson wrote:
Yes. But this isn't going to cost any more time than figuring out
whether or not the list multiplication is going to cause quirks, itself.
Human psychology *tends* (it's a FAQ
On 11/06/2012 10:56 PM, Demian Brecht wrote:
My question was *not* based on what I perceive to be intuitive
(although most of this thread has now seemed to devolve into that and
become more of a philosophical debate), but was based on what I
thought may have been inconsistent behaviour (which
On 11/07/2012 05:39 AM, Joshua Landau wrote:
On 7 November 2012 11:11, Oscar Benjamin wrote:
On Nov 7, 2012 5:41 AM, Gregory Ewing wrote:
If anything is to be done in this area, it would be better
as an extension of list comprehensions, e.g.
[[None times 5]
On 11/07/2012 01:01 PM, Ian Kelly wrote:
On Wed, Nov 7, 2012 at 12:51 PM, Andrew Robinson
andr...@r3dsolutions.com wrote:
Interesting, you avoided the main point lists are copied with list
multiplication.
It seems that each post is longer than the last. If we each responded
to every point
On 11/07/2012 03:39 PM, Ian Kelly wrote:
Why? Just to get rid of an FAQ?
:-)
Here's one of the more interesting uses from my own code:
OK, and is this a main use case? (I'm not saying it isn't I'm asking.)
Replacing the list multiplication in that function with a list
comprehension would
On 11/07/2012 04:00 PM, Steven D'Aprano wrote:
Andrew, it appears that your posts are being eaten or rejected by my
ISP's news server, because they aren't showing up for me. Possibly a side-
effect of your dates being in the distant past?
Date has been corrected since two days ago. It will
On 11/05/2012 10:07 PM, Chris Angelico wrote:
On Tue, Nov 6, 2012 at 4:51 PM, Andrew Robinson
andr...@r3dsolutions.com wrote:
I really don't think doing a shallow copy of lists would break anyone's
program.
Well, it's a change, a semantic change. It's almost certainly going to
break
On 11/06/2012 06:35 AM, Oscar Benjamin wrote:
In general, people don't use element multiplication (that I have
*ever* seen) to make lists where all elements of the outer most list
point to the same sub-*list* by reference. The most common use of the
multiplication is to fill an array with
On 11/06/2012 09:32 AM, Prasad, Ramit wrote:
Ian Kelly wrote:
On Tue, Nov 6, 2012 at 1:21 AM, Andrew Robinson
[snip]
See if you can find *any* python program where people desired the
multiplication to have the die effect that changing an object in one of the
sub lists -- changes all
On 11/06/2012 01:19 AM, Ian Kelly wrote:
On Tue, Nov 6, 2012 at 1:21 AM, Andrew Robinson
If you nest it another time;
[[[None]]]*4, the same would happen; all lists would be independent -- but
the objects which aren't lists would be refrenced-- not copied.
a=[[[alpha,beta]]]*4 would yield
On 11/06/2012 01:04 AM, Steven D'Aprano wrote:
On Mon, 05 Nov 2012 21:51:24 -0800, Andrew Robinson wrote:
The most compact notation in programming really ought to reflect the
most *commonly* desired operation. Otherwise, we're really just making
people do extra typing for no reason
On 11/05/2012 06:30 PM, Oscar Benjamin wrote:
On 6 November 2012 02:01, Chris Angelicoros...@gmail.com wrote:
On Tue, Nov 6, 2012 at 12:32 PM, Oscar Benjamin
oscar.j.benja...@gmail.com wrote:
I was just thinking to myself that it would be a hard thing to change
because the list would need to
On 11/04/2012 10:27 PM, Demian Brecht wrote:
So, here I was thinking oh, this is a nice, easy way to initialize a 4D
matrix (running 2.7.3, non-core libs not allowed):
m = [[None] * 4] * 4
The way to get what I was after was:
m = [[None] * 4, [None] * 4, [None] * 4, [None * 4]]
FYI: The
On 11/04/2012 11:27 PM, Chris Angelico wrote:
On Mon, Nov 5, 2012 at 6:07 PM, Chris Rebertc...@rebertia.com wrote:
x = None
x.a = 42
Traceback (most recent call last):
File stdin, line 1, inmodule
AttributeError: 'NoneType' object has no attribute 'a'
Python needs a
Forwarded to python list:
Original Message
Subject:Re: Negative array indicies and slice()
Date: Sat, 03 Nov 2012 15:32:04 -0700
From: Andrew Robinson
Reply-To: andr...@r3dsolutions.com
To: Ian Kelly
On 11/01/2012 05:32 PM, Ian Kelly wrote:
On Thu
Hi Ian,
I apologize for trying your patience with the badly written code
example. All objects were meant to be ThirdParty(), the demo was only
to show how a slice() filter could have been applied for the reasons
PEP357 made index() to exist.
eg: because numpy items passed to __getitems__ via
When Python3.2 is running, is there an easy way within Python to capture
the *total* amount of heap space the program is actually using (eg:real
memory)? And how much of that heap space is allocated to variables (
including re-capturable data not yet GC'd ) ?
--
On 11/01/2012 07:12 AM, Ethan Furman wrote:
Andrew Robinson wrote:
On 10/31/2012 02:20 PM, Ian Kelly wrote:
On Wed, Oct 31, 2012 at 7:42 AM, Andrew Robinson wrote:
Then; I'd note: The non-goofy purpose of slice is to hold three
data values; They are either numbers or None
On 11/01/2012 12:07 PM, Ian Kelly wrote:
On Thu, Nov 1, 2012 at 5:32 AM, Andrew Robinson
andr...@r3dsolutions.com wrote:
H was that PEP the active state of Python, when Tim rejected the bug
report?
Yes. The PEP was accepted and committed in March 2006 for release in
Python 2.5
On 10/30/2012 10:29 PM, Michael Torrie wrote:
As this is the case, why this long discussion? If you are arguing for
a change in Python to make it compatible with what this fork you are
going to create will do, this has already been fairly thoroughly
addressed earl on, and reasons why the
On 10/31/2012 02:20 PM, Ian Kelly wrote:
On Wed, Oct 31, 2012 at 7:42 AM, Andrew Robinson wrote:
Then; I'd note: The non-goofy purpose of slice is to hold three
data values; They are either numbers or None. These *normally*
encountered values can't create a memory loop.
So
Hi Ian,
There are several interesting/thoughtful things you have written.
I like the way you consider a problem before knee jerk answering.
The copying you mention (or realloc) doesn't re-copy the objects on the
list.
It merely re-copies the pointer list to those objects. So lets see what
it
On 10/29/2012 04:01 PM, Ian Kelly wrote:
On Mon, Oct 29, 2012 at 9:20 AM, Andrew Robinson
andr...@r3dsolutions.com wrote:
FYI: I was asking for a reason why Python's present implementation is
desirable...
I wonder, for example:
Given an arbitrary list:
a=[1,2,3,4,5,6,7,8,9,10,11,12]
Why
On 10/29/2012 10:53 PM, Michael Torrie wrote:
On 10/29/2012 01:34 PM, Andrew Robinson wrote:
No, I don't think it big and complicated. I do think it has timing
implications which are undesirable because of how *much* slices are used.
In an embedded target -- I have to optimize; and I will have
On 10/29/2012 11:51 PM, Ian Kelly wrote:
On Mon, Oct 29, 2012 at 4:39 PM, Andrew Robinson
As above, you're looking at the compiler code, which is why you're
finding things like line and column. The tuple struct is defined
in tupleobject.h and stores tuple elements in a tail array.
If you re
On 10/30/2012 11:02 AM, Ian Kelly wrote:
On Tue, Oct 30, 2012 at 10:14 AM, Ethan Furmanet...@stoneleaf.us wrote:
File a bug report?
Looks like it's already been wontfixed back in 2006:
http://bugs.python.org/issue1501180
Thanks, IAN, you've answered the first of my questions and have been a
On 10/30/2012 01:17 AM, Steven D'Aprano wrote:
By the way Andrew, the timestamps on your emails appear to be off, or
possibly the time zone. Your posts are allegedly arriving before the
posts you reply to, at least according to my news client.
:D -- yes, I know about that problem. Every time I
On 10/30/2012 04:48 PM, Mark Lawrence wrote:
On 30/10/2012 15:47, Andrew Robinson wrote:
I would refer you to a book written by Steve Maguire, Writing Solid
Code; Chapter 5; Candy machine interfaces.
The book that took a right hammering here
http://accu.org/index.php?module=bookreviewsfunc
Ian,
Looks like it's already been wontfixed back in 2006:
http://bugs.python.org/issue1501180
Absolutely bloody typical, turned down because of an idiot. Who the hell is
Tim Peters anyway?
I don't really disagree with him, anyway. It is a rather obscure bug
-- is it worth increasing
Ok, hopefully this is better. I love my own e-mail editor...
I can see that the slice() function can pass in arbitrary arguments.
I'm not sure for lists, which is what the range is applied to, why an
argument like a would be part of a slice.
I *really* don't see what the advantage of a slice
On 10/29/2012 04:32 AM, Chris Angelico wrote:
I wonder if what the OP is looking for is not slicing, but something
more akin to map. Start with a large object and an iterator that
produces keys, and create an iterator/list of their corresponding
values. Something like: a=[1,2,3,4,5,6,7,8,9,10]
On 10/29/2012 04:19 AM, Steven D'Aprano wrote:
On Mon, 29 Oct 2012 00:54:29 -0700, Andrew wrote:
Slices and iterators have different purposes and therefore have not been
made interchangeable. Yes, there are certain similarities between a slice
and xrange, but there are also significant
On 10/29/2012 05:23 AM, icgwh wrote:
Hello all,
I am very new to python. I am currently porting a little project of mine from
java to python and I need to be able to construct and write png images. I
naturally turned myself toward pypng to accomplish this.
I don't know if this will help,
On 10/29/2012 06:39 AM, ic...@tagyourself.com wrote:
That's very kind of you but I don't think it would be particularly fitted to my needs.
The program I'm trying to code creates an image as an 2D array of pixels
which is defined by RGBA value. My program needs to access and modifies every
On 10/29/2012 06:52 AM, Roy Smith wrote:
Show me an example where someone would write a slice with a negative and
a positive index (both in the same slice);
and have that slice grab a contiguous slice in the *middle* of the list
with orientation of lower index to greater index.
It's possible in
On 10/29/2012 10:09 AM, Ian Kelly wrote:
On Oct 29, 2012 7:10 AM, Andrew Robinsonandr...@r3dsolutions.com wrote:
I will be porting Python 3.xx to a super low power embedded processor (MSP430),
both space and speed are at a premium.
Running Python on top of Java would be a *SERIOUS* mistake.
On 10/29/2012 06:53 AM, Chris Angelico wrote:
Can you provide links to these notes? I'm looking at
cpython/Include/sliceobject.h that has this comment:
/*
A slice object containing start, stop, and step data members (the
names are from range). After much talk with Guido, it was decided to
let
On 10/29/2012 05:02 PM, Steven D'Aprano wrote:
On Mon, 29 Oct 2012 08:42:39 -0700, Andrew Robinson wrote:
But, why can't I just overload the existing __getitem__ for lists and
not bother writing an entire class?
You say that as if writing an entire class was a big complicated
effort. It isn't
On 10/29/2012 06:49 PM, Chris Kaynor wrote:
Every Python object requires two pieces of data, both of which are
pointer-sized (one is a pointer, one is an int the size of a pointer).
These are: a pointer to the object's type, and the object's reference
count. A tuple actually does not need a
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