John O'Hagan :
> Same object, just a different name - but a different result. I get
> why, but still find that odd.
The general principle is stated in the language specification:
http://docs.python.org/3.2/reference/simple_stmts.html
#augmented-assignment-statements>:
Also, when possib
Chris Angelico :
> Simple rule of thumb: Never use 'is' with strings or ints. They're
> immutable, their identities should be their values. Playing with 'is'
> will only confuse you, unless you're specifically going for
> introspection and such.
Here's a use case for "is" with strings (or ints):
On Fri, 28 Feb 2014 16:00:10 +1100, Chris Angelico wrote:
> If we had some other tag, like 'd', we could actually construct a
> Decimal straight from the source code. Since source code is a string,
> it'll be constructed from that string, and it'll never go via float.
Now that Python has a fast C
On Fri, Feb 28, 2014 at 4:39 PM, Mark H. Harris wrote:
> On Thursday, February 27, 2014 10:43:23 PM UTC-6, Chris Angelico wrote:
>
>> Simple rule of thumb: Never use 'is' with strings or ints. They're
>> immutable, their identities should be their values. Playing with 'is'
>> will only confuse you
On Fri, Feb 28, 2014 at 9:15 AM, Ben Finney wrote:
> Since you'll be posting the code in-line, make sure it's short. Since
> it'll be short, make sure it's complete — we should need nothing else to
> run the code and expect to see the same behaviour you're seeing.
>
> Since you'll be making it sho
On Thursday, February 27, 2014 10:43:23 PM UTC-6, Chris Angelico wrote:
> Simple rule of thumb: Never use 'is' with strings or ints. They're
> immutable, their identities should be their values. Playing with 'is'
> will only confuse you, unless you're specifically going for
> introspection and su
On Fri, Feb 28, 2014 at 4:18 PM, Mark H. Harris wrote:
> do I make the assumption that all functions will take a string as argument
> and then let interactive users bare the responsibility to enter a string or
> decimal... avoiding floats...
Just have your users pass in Decimal objects. They ca
On Thursday, February 27, 2014 10:26:59 PM UTC-6, Chris Angelico wrote:
> Create Decimal values from strings, not from the str() of a float,
> which first rounds in binary and then rounds in decimal.
>
Thanks Chris... another excellent point... ok, you guys have about convinced
me (which is sp
On Thu, 27 Feb 2014 18:19:09 +0200
Marko Rauhamaa wrote:
> Eric Jacoboni :
>
> a_tuple[1] += [20]
> > Traceback (most recent call last):
> > File "", line 1, in
> > TypeError: 'tuple' object does not support item assignment
> >
> > [...]
> >
> > But, then, why a_tuple is still modified?
"Mark H. Harris" Wrote in message:
> my isp withdrew the post service (nntp) from their server at end of 2011...
> and I didn't notice till now! ha! So, I'm not using seamonkey any
> longer... using google groups/ and that has been a fit to get used to, but
> I'm making progress.
>
>
On Fri, Feb 28, 2014 at 3:41 PM, Mark H. Harris wrote:
> So, I am thinking I need to mods... maybe an idmath.py for interactive
> sessions, and then dmath.py for for running within my scientific scripts...
> ??
No; the solution is to put quotes around your literals in interactive
mode, too.
On Thursday, February 27, 2014 9:15:36 PM UTC-6, Steven D'Aprano wrote:
> Decimal uses base 10, so it is a better fit for numbers we
> write out in base 10 like "0.12345", but otherwise it suffers from the
> same sort of floating point rounding issues as floats do.
>
>
> py> Decimal('1.2345'
On Fri, Feb 28, 2014 at 1:29 PM, Mark H. Harris wrote:
> a=1024
> b=a
> b=1024
> a is b
> False
No no no no! They're not pointing to the same integer any more. Now,
if you change the "b=1024" from being a mostly-useless assignment (to
another int with the same value) into being a comparison, then
On 27/02/2014 8:41 PM, Chris Angelico wrote:
On Thu, Feb 27, 2014 at 9:30 PM, Peter Clark wrote:
# Dragons and dungeons, based on CP/M program messages from ca. 1966
# This version designed and produced by peter clark beginning in December 2013
def startandload(n):# introduce program and all
On Fri, Feb 28, 2014 at 1:15 PM, Mark H. Harris wrote:
> Its just easier to type D(2.78) than Deciaml('2.78').
It's easier to type 2.78 than 2.718281828, too, but one of them is
just plain wrong. Would you tolerate using 2.78 for e because it's
easier to type? I mean, it's gonna be close.
Creat
Are there libraries for doing this?
I would like to autogenerate JSON-schema for use inside an API explorer.
However whenever there is a schema change; I would only like to change
the schema in one place (where possible).
E.g.: For use here - https://github.com/salesking/json-schema-browser
How
On Thu, 27 Feb 2014 15:00:45 -0800, Mark H. Harris wrote:
> Decimal does not keep 0.1 as a floating point format (regardless of
> size) which is why banking can use Decimal without having to worry about
> the floating formatting issue... in other words, 0.0 is not stored in
> Decimal as any k
"Mark H. Harris" writes:
> So, yeah, thinking about variables is just not going away.
Right. I would like, ideally, for the Python documentation to avoid
mentioning that term entirely; and I would hope for that to promote a
better understanding of Python's data model.
The wider programming comm
On Thursday, February 27, 2014 8:07:20 PM UTC-6, Steven D'Aprano wrote:
> If they point to the same piece of memory -- which, by the way, can be
> moved around if the garbage collector supports it -- then A is B cannot
> possibly return False.
>
hi Steve, long time, yes, my whole point exac
On Thursday, February 27, 2014 5:50:55 PM UTC-6, Oscar Benjamin wrote:
> . . . Calling Decimal on a float performs an exact binary to
> decimal conversion. Your reasoning essentially assumes that every
> float should be interpreted as an approximate representation for a
> nearby decimal value.
> Surely the answer will depend on the linter you are using. Care to tell
> us, or shall we guess?
Hey Steven,
I am using PyCharm, I have to admit I feel silly on this one. I had a buried
assignment
that overrode the inferred type. It wasn't until a fresh set of eyes confirmed
something
was awry
On Thu, 27 Feb 2014 15:29:01 -0800, Mark H. Harris wrote:
> Knowing that A points to an int, and
> that B=A, now B points to the VERY SAME int... they are references
> pointing to the same piece of memory. And of course we want new folks to
> understand the issue of: A==B
> True
> A is B
> False
On Thu, 27 Feb 2014 22:21:31 +, Joseph L. Casale wrote:
> How does one satisfy a lint/type checker with the return value of a
> class method decorated with a descriptor?
Surely the answer will depend on the linter you are using. Care to tell
us, or shall we guess?
--
Steven
--
https://m
On Fri, 28 Feb 2014 00:29:35 +1300, Gregory Ewing wrote:
> Steven D'Aprano wrote:
>> On Thu, 27 Feb 2014 16:34:33 +1300, Gregory Ewing wrote:
>>
>>>Why not just use this version all the time? It should work in both 2.x
>>>and 3.x.
>>
>> Because that's yucky. It's an aesthetic thing: when support
On Fri, 28 Feb 2014 00:55:01 +, Denis McMahon wrote:
> The code in the file at the url below processes 17 different cases. It
> may help, or it may confuse.
> http://www.sined.co.uk/tmp/strparse.py.txt
I added some more cases to it, and then realised that the code could
actually be simplifi
On Thu, 27 Feb 2014 20:07:56 +, Jignesh Sutar wrote:
> I've kind of got this working but my code is very ugly. I'm sure it's
> regular expression I need to achieve this more but not very familiar
> with use regex, particularly retaining part of the string that is being
> searched/matched for.
On 27 February 2014 23:00, Mark H. Harris wrote:
> On Thursday, February 27, 2014 10:24:23 AM UTC-6, Oscar Benjamin wrote:
>
> from decimal import Decimal as D
>> >>> D(0.1)
>> Decimal('0.155511151231257827021181583404541015625')
>
> hi Oscar, well, that's not what I'm doing
On Friday, February 28, 2014 12:00:45 AM UTC+1, Mark H. Harris wrote:
> On Thursday, February 27, 2014 10:24:23 AM UTC-6, Oscar Benjamin wrote:
> from decimal import Decimal as D
>
> > >>> D(0.1)
>
> > Decimal('0.155511151231257827021181583404541015625')
>
> >
> hi Oscar,
On Thursday, February 27, 2014 11:54:44 AM UTC-6, Ned Batchelder wrote:
> Mark, thanks for helping to answer the OP's question. We've covered (in
> depth) in the rest of this thread, that Python *does* have the concept
> of a variable, it just behaves differently than some other popular
> pro
On Thursday, February 27, 2014 4:15:16 PM UTC-6, Ben Finney wrote:
>
> Post your code in-line with your message. This is for the sake of the
> people whose time you're requesting, and of later readers who will find
> the thread when searching the archives -- URLs to snippets are likely to
> be in
On Thursday, February 27, 2014 10:24:23 AM UTC-6, Oscar Benjamin wrote:
from decimal import Decimal as D
> >>> D(0.1)
> Decimal('0.155511151231257827021181583404541015625')
>
hi Oscar, well, that's not what I'm doing with my D()... I'm not just
making D() mimic Decimal.
On Tue, 25 Feb 2014 02:18:43 -, Dennis Lee Bieber
wrote:
On Mon, 24 Feb 2014 01:01:15 -, "Rhodri James"
declaimed the following:
The function "range" returns the sequence of numbers 1, 2, 3, 4 and 5
[*],
so this has the same effect as if you had typed:
Wrong -- it
How does one satisfy a lint/type checker with the return value of a class
method decorated
with a descriptor? It returns a dict, and I want the type hinting to suggest
this versus the
str|unknown its defaults to.
Thanks,
jlc
--
https://mail.python.org/mailman/listinfo/python-list
On Thu, Feb 27, 2014 at 2:47 PM, Nick Timkovich wrote:
> On Thu, Feb 27, 2014 at 10:33 AM, Chris Angelico wrote:
>>
>> On Fri, Feb 28, 2014 at 3:27 AM, Eric Jacoboni
>> wrote:
>> > But, imho, it's far from being a intuitive result, to say the least.
>>
>> It's unintuitive, but it's a consequence
"Mark H. Harris" writes:
>Its been too long... can't remember... are there rules here about
>posting code snippets, or length considerations, and so forth?
Post your code in-line with your message. This is for the sake of the
people whose time you're requesting, and of later readers who
On 2014-02-27 15:45, Tim Chase wrote:
> >>> r = re.compile(r"^([^:]*)(?::((?:(?!-:-).)*)(?:-:-(.*))?)?")
If you want to compare both the re method and the string method,
here's a test-harness to play with:
import re
examples = [
("", (None, None, None)),
("Test1A", ("Test1A", None, No
On 2/27/2014 4:02 AM, Frank Millman wrote:
However, deepcopying a byte string is orders of magnitude quicker than
copying it.
Actually, looking closer, it is the 'copy' that is slow, not the
'deepcopy' that is quick..
I have created an issue on the bug tracker -
http://bugs.python.org/issue2
On Fri, Feb 28, 2014 at 8:47 AM, Nick Timkovich wrote:
> On Thu, Feb 27, 2014 at 10:33 AM, Chris Angelico wrote:
>>
>> On Fri, Feb 28, 2014 at 3:27 AM, Eric Jacoboni
>> wrote:
>> > But, imho, it's far from being a intuitive result, to say the least.
>>
>> It's unintuitive, but it's a consequence
Hello!
I hope this is the right place to ask about this, sorry if it's
inappropriate.
At our University we have to do a project for a class called Virtual
Execution Environments. We decided that it would be great to work with/on
the Python VM. The project has to revolve around one of the followin
On Thu, Feb 27, 2014 at 10:33 AM, Chris Angelico wrote:
> On Fri, Feb 28, 2014 at 3:27 AM, Eric Jacoboni
> wrote:
> > But, imho, it's far from being a intuitive result, to say the least.
>
> It's unintuitive, but it's a consequence of the way += is defined. If
> you don't want assignment, don't
On 2014-02-27 20:07, Jignesh Sutar wrote:
> I've kind of got this working but my code is very ugly. I'm sure
> it's regular expression I need to achieve this more but not very
> familiar with use regex, particularly retaining part of the string
> that is being searched/matched for.
While I suppose
On 27Feb2014 20:07, Jignesh Sutar wrote:
> I've kind of got this working but my code is very ugly. I'm sure it's
> regular expression I need to achieve this more but not very familiar with
> use regex, particularly retaining part of the string that is being
> searched/matched for.
Regexps are qui
I've kind of got this working but my code is very ugly. I'm sure it's
regular expression I need to achieve this more but not very familiar with
use regex, particularly retaining part of the string that is being
searched/matched for.
Notes and code below to demonstrate what I am trying to achieve.
YE SHANG Wrote in message:
> I'm starting to learn virtualenv, I wonder how run python project developed
> in virtualenv.
>
> Here is my situation, there is a server we can access with a common user name
> and password, there are many py scripts wrote by different people on this
> server.
>
On 2/27/14 8:24 AM, Mark H. Harris wrote:
As others have noted, python does not have a 'variable' concept (references to
objects instead) and so your question is a little ambiguous.
Mark, thanks for helping to answer the OP's question. We've covered (in
depth) in the rest of this thread, t
On Fri, Feb 28, 2014 at 4:07 AM, Terry Reedy wrote:
> On 2/27/2014 7:07 AM, Mark H. Harris wrote:
>
>> Oh, and one more thing... whoever is doing the work on IDLE these
>> days, nice job! It is stable, reliable, and just works/
>> appreciate it!
>
>
> As one of 'them', thank you for the feedback
On 2/27/2014 7:07 AM, Mark H. Harris wrote:
Oh, and one more thing... whoever is doing the work on IDLE these
days, nice job! It is stable, reliable, and just works/
appreciate it!
As one of 'them', thank you for the feedback. There are still some bugs,
but I hit them seldom enough that I a
On Thu, Feb 27, 2014 at 10:27 AM, Eric Jacoboni wrote:
> Le 27/02/2014 17:13, Zachary Ware a écrit :
>>
>> You're not the first person to have this question :)
>>
>> http://docs.python.org/3/faq/programming.html#why-does-a-tuple-i-item-raise-an-exception-when-the-addition-works
>>
>
> Oh yes, i wa
On Fri, Feb 28, 2014 at 3:27 AM, Eric Jacoboni wrote:
> But, imho, it's far from being a intuitive result, to say the least.
It's unintuitive, but it's a consequence of the way += is defined. If
you don't want assignment, don't use assignment :)
ChrisA
--
https://mail.python.org/mailman/listinf
Le 27/02/2014 17:13, Zachary Ware a écrit :
>
> You're not the first person to have this question :)
>
> http://docs.python.org/3/faq/programming.html#why-does-a-tuple-i-item-raise-an-exception-when-the-addition-works
>
Oh yes, i was aware of this explanation (thanks to Chris for his answer,
too
On 27 February 2014 15:42, Mark H. Harris wrote:
> On Thursday, February 27, 2014 8:42:55 AM UTC-6, Oscar Benjamin wrote:
>
>>
>> Some points:
>
>Thanks so much... you have clarified some things I was struggling with...
>
>> 1) Why have you committed the code as a .tar.gz file?
>
> um, to
Eric Jacoboni :
a_tuple[1] += [20]
> Traceback (most recent call last):
> File "", line 1, in
> TypeError: 'tuple' object does not support item assignment
>
> [...]
>
> But, then, why a_tuple is still modified?
That's because the += operator
1. modifies the list object in place
2. tri
On Fri, Feb 28, 2014 at 3:01 AM, Eric Jacoboni wrote:
> I'm using Python 3.3 and i have a problem for which i've still not found
> any reasonable explanation...
>
a_tuple = ("spam", [10, 30], "eggs")
a_tuple[1] += [20]
> Traceback (most recent call last):
> File "", line 1, in
> TypeE
On Thu, Feb 27, 2014 at 10:01 AM, Eric Jacoboni wrote:
> Hi,
>
> I'm using Python 3.3 and i have a problem for which i've still not found
> any reasonable explanation...
>
a_tuple = ("spam", [10, 30], "eggs")
a_tuple[1] += [20]
> Traceback (most recent call last):
> File "", line 1, in
Hi,
I'm using Python 3.3 and i have a problem for which i've still not found
any reasonable explanation...
>>> a_tuple = ("spam", [10, 30], "eggs")
>>> a_tuple[1] += [20]
Traceback (most recent call last):
File "", line 1, in
TypeError: 'tuple' object does not support item assignment
Ok... I
On Fri, Feb 28, 2014 at 2:42 AM, Mark H. Harris wrote:
>> 1) Why have you committed the code as a .tar.gz file?
>
> um, to save space... well, I know its tiny, but its just a habit I
> have... 5kb instead of 25kb...
When you commit changes, though, it has to treat it as a completely
changed
On 2014-02-27 04:13, Mark H. Harris wrote:
> are there rules here about posting code snippets, or length
> considerations, and so forth? Seems like there was a place to share
> code snips outside of the message area?
This is the internet, so you're welcome to post code as you please.
However, b
On Thursday, February 27, 2014 8:42:55 AM UTC-6, Oscar Benjamin wrote:
>
> Some points:
Thanks so much... you have clarified some things I was struggling with...
> 1) Why have you committed the code as a .tar.gz file?
um, to save space... well, I know its tiny, but its just a habit I ha
I'm starting to learn virtualenv, I wonder how run python project developed in
virtualenv.
Here is my situation, there is a server we can access with a common user name
and password, there are many py scripts wrote by different people on this
server.
If I develop my python project with virtual
On Thursday, February 27, 2014 9:01:50 AM UTC-6, Jerry Hill wrote:
> --
>
> Jerry
Thanks guys, perfect. 'preciate it!
--
https://mail.python.org/mailman/listinfo/python-list
On Thu, Feb 27, 2014 at 7:13 AM, Mark H. Harris wrote:
> hi folks,
>Its been too long... can't remember... are there rules here about posting
> code snippets, or length considerations, and so forth?
Chris' advice about just posting your code inline with your message is
good. If the problem
[Please help spread the word by forwarding to other relevant mailing lists,
user groups, etc. world-wide; thanks :-)]
Dear Python Community,
for many years, the Python Job board (http://legacy.python.org/community/jobs/)
was run by volunteers - most of the time by just one volunteer at a
time un
On 27 February 2014 12:07, Mark H. Harris wrote:
>
> I have created a project here:
>
> https://code.google.com/p/pythondecimallibrary/
>
> I wrote a dmath.py library module for use with the C accelerated decimal
> module, that I would like to see merged into the C Python distribution so
> that
On Friday, February 21, 2014 12:37:59 AM UTC-6, Sam wrote:
> I need to pass a global variable into a python function. However, the global
> variable does not seem to be assigned after the function ends. Is it because
> parameters are not passed by reference? How can I get function parameters to
Sent from my iPhone
> On Feb 20, 2014, at 5:59 AM, Ferrous Cranus wrote:
>
> Τη Τετάρτη, 19 Φεβρουαρίου 2014 10:45:53 π.μ. UTC+2, ο χρήστης Wojciech
> Łysiak έγραψε:
>>> On 19.02.2014 09:14, Sujith S wrote:
>>>
>>> Hi,
>>
>>
>>> I am new to programming and python. I am looking for a python
On Thu, Feb 27, 2014 at 11:13 PM, Mark H. Harris wrote:
> hi folks,
>Its been too long... can't remember... are there rules here about posting
> code snippets, or length considerations, and so forth?
>Seems like there was a place to share code snips outside of the message
> area?
The co
hi folks,
Its been too long... can't remember... are there rules here about posting
code snippets, or length considerations, and so forth?
Seems like there was a place to share code snips outside of the message
area?
A related question, is there a python repository for uploading p
On Wednesday, February 19, 2014 4:10:22 PM UTC-6, Terry Reedy wrote:
> Or just dmath. I think this is a better idea than suggesting additions
> to decimal itself. For one thing, anything put in decimal would be
> subject to change if the function were to be added to the standard. It
> is worth
On Thu, Feb 27, 2014 at 10:29 PM, Gregory Ewing
wrote:
> Steven D'Aprano wrote:
>>
>> On Thu, 27 Feb 2014 16:34:33 +1300, Gregory Ewing wrote:
>>
>>> Why not just use this version all the time? It should work in both 2.x
>>> and 3.x.
>>
>>
>> Because that's yucky. It's an aesthetic thing: when sup
Steven D'Aprano wrote:
On Thu, 27 Feb 2014 16:34:33 +1300, Gregory Ewing wrote:
Why not just use this version all the time? It should work in both 2.x
and 3.x.
Because that's yucky. It's an aesthetic thing: when supported, I want the
Python interpreter to manage the context manager.
More y
>
> They must be running an older version of FreeBSD since the default version
> of python is 2.7.
>
> There is a FreeBSD package for argparse, the command would be something
> like
>pkg_add -r install py26-argparse
>
>
> Rod
>
>
Yes Iam running a older version of FreeBSD ( Iam actually run
On Thu, Feb 27, 2014 at 9:30 PM, Peter Clark wrote:
> Hi, I have just started trying to use python version 3, under windows XP, I
> have got a simple script (attached) to run as I want in Interpreter mode.
> It is saved as a .py file. If I double click on the file the python screen
> opens and app
On Wednesday, February 19, 2014 4:29:27 PM UTC-6, Oscar Benjamin wrote:
> Actually the performance difference isn't as big as you might think.
>
> Oscar
You're right. At least my own benchmark on my native exp() vs the built-in
was about ~same ~same.
I was hoping that Stefan had used FFT...
>
> Have you looked at the gmpy2 ( https://code.google.com/p/gmpy/ ) module?
>
> casevh
No... was not aware of gmpy2... looks like a great project! I am wondering
why it would be sooo much faster? I was hoping that Stefan Krah's C
accelerator was using FFT fast fourier transforms for mul
On 27.02.14, 7:30 , Frank Millman wrote:
> Hi all
>
> I noticed this a little while ago, but dismissed it as a curiosity.
> On reflection, I decided to mention it here in case it indicates a
> problem.
>
> This is with python 3.3.2.
>
> C:\>python -m timeit -s "import copy" "copy.copy('a'*1000)"
On Thursday, 30 January 2014, 21:27, Peter Clark wrote:
Thank-you. Please no-one reply to this post. I just want to put on record my
complete p-offed-ness, that having spent 10 days sorting out and hypertexting a
library of documentation, I now have to start all over.
Please do not respond,
On Thu, 27 Feb 2014 00:31:56 +, Steven D'Aprano wrote:
> On Wed, 26 Feb 2014 14:00:59 +, Alister wrote:
>
>> On Wed, 26 Feb 2014 13:15:25 +, Steven D'Aprano wrote:
>>
>>> I have to dynamically generate some code inside a function using exec,
>>> but I'm not sure if it is working by a
"Frank Millman" wrote in message
news:lemm11$18r$1...@ger.gmane.org...
> Hi all
>
> I noticed this a little while ago, but dismissed it as a curiosity. On
> reflection, I decided to mention it here in case it indicates a problem.
>
> This is with python 3.3.2.
>
> C:\>python -m timeit -s "impor
Frank Millman wrote:
> Hi all
>
> I noticed this a little while ago, but dismissed it as a curiosity. On
> reflection, I decided to mention it here in case it indicates a problem.
>
> This is with python 3.3.2.
>
> C:\>python -m timeit -s "import copy" "copy.copy('a'*1000)"
> 10 loops, best
On Wed, Feb 26, 2014 at 11:30 PM, Frank Millman wrote:
> Hi all
>
> I noticed this a little while ago, but dismissed it as a curiosity. On
> reflection, I decided to mention it here in case it indicates a problem.
>
> This is with python 3.3.2.
>
> C:\>python -m timeit -s "import copy" "copy.copy(
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