Is there any discussion of having real booleans
in Python 3000? Say something along the line
of the numpy implementation for arrays of type 'bool'?
Hoping the bool type will be fixed will be fixed,
Alan Isaac 57 3335
Alan Isaac wrote:
Is there any discussion of having real booleans
in Python 3000?
I'm not sure how the bools we have now are not "real."
Say something along the line of the numpy implementation for arrays
of type 'bool'?
What aspect of this do you want? A bool typecode for the stdlib array
module?
I can guess a number of things that you might mean, but it would be best
if you explained with an example of what current behavior is and what
you would like it to be.
--
Michael Hoffman
Peter Otten wrote:
The last I have seen is http://mail.python.org/pipermail/pyt...ry/005284.html
OK. Thanks.
Do you care to explain what is broken?
I suppose one either finds coercion of arithmetic operations to int
to be odd/broken or does not. But that's all I meant.
My preference would be for the arithmetic operations *,+,-
to be given the standard interpretation for a two element
boolean algebra: http://en.wikipedia.org/wiki/Two-ele...oolean_algebra
In contrast with the link above,
it does not bother me that arithmetic with ints and bools
produces ints.
Cheers,
Alan Isaac
Alan G Isaac wrote:
Do you care to explain what is broken?
I suppose one either finds coercion of arithmetic operations to int
to be odd/broken or does not. But that's all I meant.
My preference would be for the arithmetic operations *,+,-
to be given the standard interpretation for a two element
boolean algebra: http://en.wikipedia.org/wiki/Two-ele...oolean_algebra
If I understand this right, the biggest difference from the current
implementation would be that::
True + True == True
instead of:
True + True == 2
What's the advantage of that? Could you give some use cases where that
would be more useful than the current behavior?
It's much easier to explain to newcomers that *, + and - work on True
and False as if they were 1 and 0 than it is to introduce them to a two
element boolean algebra. So making this kind of change needs a pretty
strong motivation from real-world code.
Steve
> Do you care to explain what is broken?
> My preference would be for the arithmetic operations *,+,- to be given the standard interpretation for a two element boolean algebra: http://en.wikipedia.org/wiki/Two-ele...oolean_algebra
If I understand this right, the biggest difference from the current
implementation would be that::
True + True == True
instead of:
True + True == 2
What's the advantage of that? Could you give some use cases where that
would be more useful than the current behavior?
I prefer the use of 'and' and 'or', and they feel more pythonic than & and
+
--
Using Opera's revolutionary e-mail client: http://www.opera.com/mail/
Alan Isaac wrote:
Hoping the bool type will be fixed will be fixed,
Is there any type named "bool" in standard Python?
Regards,
Björn
--
BOFH excuse #207:
We are currently trying a new concept of using a live mouse.
Unfortunately, one has yet to survive being hooked up to the
computer.....pl ease bear with us.
Alan G Isaac wrote:
My preference would be for the arithmetic operations *,+,-
to be given the standard interpretation for a two element
boolean algebra: http://en.wikipedia.org/wiki/Two-ele...oolean_algebra
>>[bool(True+True) , bool(True+False )]
[True, True]
Works for me, or did I misunderstand you?
If you don't want explicitly to write bool, you could define your
own True and False classes.
Regards,
Björn
--
BOFH excuse #184:
loop found in loop in redundant loopback
"Alan Isaac" <ai****@america n.eduwrote in message
news:z0Oki.1782 $YH3.1751@trndd c08...
| Is there any discussion of having real booleans
| in Python 3000? Say something along the line
| of the numpy implementation for arrays of type 'bool'?
As far as I know, there is no such discussion among the developers.
Clp is always a different matter ;-)
Michael Hoffman <ca*******@mh39 1.invalidwrites :
Alan Isaac wrote:
Is there any discussion of having real booleans
in Python 3000?
I'm not sure how the bools we have now are not "real."
I'm guessing that Alan is referring (at least in part) to this behaviour:
Python 2.4.4 (#2, Apr 5 2007, 20:11:18)
[...]
>>True == 1
True
>>False == 0
True
Whereas a real bool type would have discrete values for True and False
that would not be equal to any other.
--
\ "I guess we were all guilty, in a way. We all shot him, we all |
`\ skinned him, and we all got a complimentary bumper sticker that |
_o__) said, 'I helped skin Bob.'" -- Jack Handey |
Ben Finney This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
by: beliavsky |
last post by:
I just came across the slides for Guido van Rossum's "Python Regrets"
talk, given in 2002. It worries me that much of my Python code would
be broken if all of his ideas were implemented. He doesn't even like
'print'. Of course, I am not qualified to argue with Van Rossum about
the direction of Python.
When is Python "3000" expected to...
|
by: Steven Bethard |
last post by:
So, as I understand it, in Python 3000, zip will basically be replaced
with izip, meaning that instead of returning a list, it will return an
iterator. This is great for situations like:
zip(*)
where I want to receive tuples of (item1, item2, item3) from the
iterables. But it doesn't work well for a situation like:
zip(*tuple_iter)
|
by: seb.haase |
last post by:
Hi,
Is it true that that "Python 3000" is dead ?
Honestly I think that e.g. changing 5/2 to be 2.5 (instead of 2) would
just break to much code :-(
On the otherhand I'm using Python as "Matlab replacement" and would
generally like 5/2 ==2.5
So, I was contemplating to default all my modules/scripts to start with
"from __future__ import...
|
by: John Salerno |
last post by:
Is 'Python 3000' just a code name for version 3.0, or will it really be
called that when it's released?
|
by: jantod |
last post by:
I think there might be something wrong with the implementation of
modulus.
Negative float values close to 0.0 break the identity "0 <= abs(a % b)
< abs(b)".
print 0.0 % 2.0 # => 0.0
print -1e-010 % 2.0 # =>1.9999999999
which is correct, but:
| |
by: beliavsky |
last post by:
At http://www-03.ibm.com/developerworks/blogs/page/davidmertz David
Mertz writes
"Presumably with 2.7 (and later 2.x versions), there will be a means of
warning developers of constructs that are likely to cause porting
issues . In the simplest case, this will include
deprecated functions and syntax constructs. But presumably the warnings...
|
by: Petr Prikryl |
last post by:
Do you think that the following could became PEP (pre PEP).
Please, read it, comment it, reformulate it,...
Abstract
Introduction of the mechanism for language extensions via
modules written using other languages. Extensions of
Python could be done via special interpreter extensions.
From Python sources, the special modules would look...
|
by: Guido van Rossum |
last post by:
python-list@python.org]
The first Python 3000 release is out -- Python 3.0a1. Be the first one
on your block to download it!
http://python.org/download/releases/3.0/
Excerpts:
Python 3000 (a.k.a. "Py3k", and released as Python 3.0) is a new
|
by: GD |
last post by:
Please remove ability to multiple inheritance in Python 3000.
Multiple inheritance is bad for design, rarely used and contains many
problems for usual users.
Every program can be designed only with single inheritance.
I also published this request at http://bugs.python.org/issue2667
|
by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it. ...
|
by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For...
| |
by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the...
|
by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes...
|
by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert...
|
by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in...
|
by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
|
by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
| |
by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating...
| |