ntinel object (e.g., `mySentinel = object()`), because that
is the only time you actually _are_ interested in identity. All other
times you are not really interested in identity.
Sample code as above is essentially showing unimportant implementation
details that should never concern you.
of large tuples can be expensive). Admittedly the empty
> tuple is a special case but then 'Special cases aren't special enough to
> break the rules'.
>
> A bit odd.
It doesn't save time if you have to check through all the existing
tuples for matches ...
--
Erik Max
e user (that's you and
> I) should *not* expect any particular behaviour to hold between
> different implementations.
Right. In the terminology of language standards, it is implementation
defined.
--
Erik Max Francis && [EMAIL PROTECTED] && http://www.alcyone.com/max/
loop, but since it's going to
be processing massive amounts of data, the faster the better. Are there
any tricks I'm not thinking of, or perhaps helper functions in other
modules that I'm not thinking of?
--
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And of course I meant fastest, not "fatest." Fattest wouldn't be good,
either.
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Whoever named it necking w
the sums as ints/longs to avoid losing precision, so
converting to floating point isn't an optional. (The sums are
normalized by the sizes of the files and expanded to 32 bits in order to
maximize precision.)
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appear to work quite as dramatically well for me with strings
instead of lists, but it certainly is an improvement.
> Of course, that optimization doesn't work for the squared sum; using a
> lambda only pessimizes it.
Right.
--
Erik Max Francis && [EMAIL PROTECTED] &
unt)
> ordinalSumSquared = sum(ord(c)**2 * count[c] for c in count)
This approach is definitely faster than using a generator in my tests,
and was second fastest overall. I'm actually a bit surprised that it's
as fast as it is; it never would have occurred to me to try it this wa
l
the next day, but got a factor of two speedup within half an hour!
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It is morale that wins the victory.
-- Gen. George C. Marshall
--
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negative. The usual translation from polar to Cartesian coordinates
makes this meaningful, albeit weird, so in effect the resulting
positions are just reflections around the origin.
Which I suppose is what the original poster was asking about, but it's
still not clear.
--
Erik Max Fra
u're going to have to
give more information about what you're doing, what you're using to do
it, and where it's giving you unexpected or undesired results if you
want help solving your problem.
--
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6, 17:16:11)
[GCC 3.2.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> 0x
4294967295L
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Black vinyl man with black plasticized imagination
-- Nik Kershaw
--
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uch tasks
would be your ability to manipulate them and write your own. If tools
already exist that do what you need, which languages they were written
in would be completely irrelevant.
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ith a list,
then the sets-difference-and-then-make-a-list mechanism is appropriate.
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It [freedom] must be demanded by the oppressed.
-- Dr. Martin Luther King, Jr.
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assigning mutates the sequence. Slicing alone
returns a copy.
>>> L = ['one', 'two', 'three', 'four', 'five']
>>> x = L[1:] # grab a slice
>>> x[:] = [] # mutate it
>>> x
[]
>>> L # original li
t; towards the back of my mouth.
Native English accents vary as well, but _roll_ rhymes with _troll_, not
_trawl_. _Trawl_ would rhyme with _fall_, and _fall_ definitely doesn't
rhyme with _roll_.
--
Erik Max Francis && [EMAIL PROTECTED] && http://www.alcyone.com/max/
San
t; sound in any
accent I've ever heard of. Which you pronounce _boat_ and _bot_ the
same way, too?
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There are no dul
;, ...]
for method in methods:
setattr(MyClass, method, lambda *x: Node(method, *x))
The first argument here will be the implicit self, if you don't want
that, strip off the first argument (or use lambda self, *x: ...).
--
Erik Max Francis && [EMAIL PROTECTED] &
Erik Max Francis wrote:
> Something like::
>
> method = ['fun', ...]
> for method in methods:
> setattr(MyClass, method, lambda *x: Node(method, *x))
Err, that first line was supposed to be methods = ...
--
Erik Max Francis && [EMAIL PROTECT
Asun Friere wrote:
> How do you figure that? Isn't the chart showing the frequency of
> those particular terms combined as a fraction of the total search
> volume on Google?
Who knows? The graph has no labeling or calibration for the y-axis, so
it's meaningless.
-
programming
language design. Excessive and needless verbosity is one thing; but
saving keystrokes for its own sake is not a priority and never should be.
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I am not afraid / To be a lone Bohemian
-- Lamya
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since Io makes no such requirements.
The attribute and method (not made distinct in Io; they're called
"slots") is much the same as with Python; the current instance is
checked for the object, then its parents, then _its_ parents, and so on.
--
Erik Max Francis && [EMA
hat), but I wouldn't take the chance and rely on such an
implementation detail.
If you want to keep track of the order in which objects were added to a
dictionary, you'll need to keep a separate list of (sorted) keys, which
is easy enough. If you're lazy there are plenty of
g wrong. Without seeing actual code, it's
impossible to say what.
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So little time, so little to do.
-- Oscar Lev
elf, x):
... self.x = x
... def __mul__(self, other):
... return C(self.x*other.x)
...
>>> result = C(2)*C(3)
>>> print result
<__main__.C instance at 0x402e13ec>
>>> result.x
6
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Erik Max Francis && [EMAIL PROTECTED] && http://www.alcyone.
our M's and a silent Q like the famous
> author Farles Wickens *wink*
"I knew a guy whose first name was Ed. He was so cool, he spelled it
with a hyphen." -- George Carlin
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San Jose, CA,
ees if the job has completed -- showing the results if it has --
or refreshes periodically if it hasn't yet.
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You coul
7;t show anything until the entire process
> is complete and it's just a bunch of echo statements in a for loop,
> I'm not sure why they behave differently.
In a word: buffering.
--
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San Jose, CA
unwise. Instead
use int:
>>> int('00052')
52
--
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God grant me to contend with those that understand me
when it reaches the surface of Mars.
It was units of momentum that were inappropriately compared, actually.
(And it broke up before hitting the ground, but that's a minor quibble.)
--
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San Jose, CA, US
;credits" or "license" for more information.
>>>> import md5
>>>> s = md5.new()
>>>> s.update('snagglefrob')
>>>> s.hexdigest()
> '9eb2459fcdd9f9b8a9fef7348bcac933'
echo inserts a newline, your Python snippet doesn
popen, or one of the more involved
popen... modules, and then parse it however you like.
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Who'd ever think it / Such
et unpredictable behavior, you just get different behavior
you didn't expect, which is not the same thing. Python is a programming
language, like any other; randomly dropping letters in names is going to
result in bad behavior, so be more careful about it.
--
Erik Max Francis && [EMAI
ne"
> ... else:
> ... print "X is not None"
> ...
No, because you're iterating over an empty list, which does nothing:
>>> for x in []: print 'hi'
...
>>>
--
Erik Max Francis && [EMAIL PROTECTED] &&a
[EMAIL PROTECTED] wrote:
> Thanks, it looks like empy is what I need.
:-)
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The object of war is not to die for your country b
[EMAIL PROTECTED] wrote:
> Actually, that looks even better that EmPy for what I need.
:-(
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All bad poetry springs from
ng pages for "python in" does not reveal very many relevant
> sources.
Yes, `in` is the relevant operator. It's quite simple to use:
>>> a = [1, 4, 9, 16, 25]
>>> 2 in a
False
>>> 4 in a
True
If you're having problems using it in some circumstan
vdrab wrote:
> what the...?
> does anybody else get mighty uncomfortable about this?
No. Why should you ever care about whether two integers representing
values are the same object? Your tests should be with `==`, not `is`.
--
Erik Max Francis && [EMAIL PROT
do that?
Floating point arithmetic is inherently imprecise. This is not a Python
problem.
If you want to print it to only three digits, then use something like::
>>> '%.3f' % 2.9954254
'2.995'
--
Erik Max Francis && [EMAIL PROTECTED] && http
[EMAIL PROTECTED] wrote:
> L = [4,3,2,1]
> L=L.sort()
> L will refer to None, why L.sort() don't return the L?
> I want to ask why the designer of Python do so?
Because that's the convention that signifies that a Python method
mutates the object rather than returns a
y choosing to ask in such a way that guarantees
practically no one will take your suggestion seriously.
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Chance favo
as
such you probably shouldn't use it or rely on it, unless you know the
internal details very well. An identifier starting with _two_
underscores is automatically mangled in a way that makes it more
difficult (but not impossible) for external clients to accidentally use
them.
--
Erik Max
like php or
> embedded perl.
>
> So my little toy works not bad, but I was wondering if such a feature
> already existed, if yes, can you point me out some links?
Another standalone templating system is EmPy:
http://www.alcyone.com/software/empy/
--
Erik Max Francis &&
y
were cutting you off unfairly?
The alternative is that you're not surprised by this action and are
simply trying to spin things in your favor.
--
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San Jose, CA, USA && 37 20 N 121 53 W
#x27;re
> posted this on purpose, you really need to grow up.'''.
>
> The problem was I did post it on purpose, but not with the intent to
> mess anyone up over it.
His statement was a conditional. Since you're saying that the
conditional does not apply, then
n-line.
It's a file. You read strings from it and write strings to it. It
isn't a string itself. Given that what you're trying to do doesn't make
any sense, it's hard to know where to begin to identify what's confusing
you.
--
Erik Max Francis && [EMAIL
t; would automatically delete itself when the code was finished.
It is more likely that keeping it in a list will be more efficient, and
easier to handle anyway.
--
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he best bet so far.
If you want to make sure something is always done in a particular
situation, then solution is to have a function or method that does that,
and then just call that function or method. That's true in any language
-- any one that has functions, anyway.
--
Erik Max Francis
s? Any help will be appreciated :)
What you're looking for is a templating system for Python. There are
already many with varying degrees of complexity and emphasis, including
one I've put together, EmPy:
http://www.alcyone.com/software/empy/
For more, google around for Py
class for elegance, but it's not required to get
the proper functionality.
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Life is a gamble so I should / Live life more carefully
-- TLC
--
http://mail.python.org/mailman/listinfo/python-list
Any after-the-fact
explanation of why the error was present (but not corrected or pointed
out in the movie) is just so much rationalization.
--
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San Jose, CA, USA && 37 18 N 121 57 W && AI
Jeff Schwab wrote:
> Erik Max Francis wrote:
>> Robert Bossy wrote:
>>> I'm pretty sure we can still hear educated people say that free fall
>>> speed depends on the weight of the object without realizing it's a
>>> double mistake.
>>
>&
Modern physics can get
weird and spooky and counterintuitive, but any real connection made with
Eastern philosophy is only in the eye of the beholder.
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wavicals,
> it's just that the wave-like fuzziness is usually too small to notice.
It's usually spelled _wavicle_, by the way.
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s out of impetus, then falls straight down --
is clearly contrary to everyday experience of watching two people throw
a ball back and forth from a distance, since the path of the ball is
clearly curved.
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27;s only when you're dealing with objects falling through vacuum that
all objects fall at the same rate, and that's because the gravitational
and inertial masses are identical.
--
Erik Max Francis && [EMAIL PROTECTED] && http://www.alcyone.com/max/
San Jose, C
Jeff Schwab wrote:
> Erik Max Francis wrote:
>> Grant Edwards wrote:
>>
>>> On 2008-02-12, Jeff Schwab <[EMAIL PROTECTED]> wrote:
>>>> Fair enough!
>>>
>>> Dear me, what's Usenet coming to these days...
>>
>> I know, rea
Grant Edwards wrote:
> On 2008-02-12, Jeff Schwab <[EMAIL PROTECTED]> wrote:
>> Fair enough!
>
> Dear me, what's Usenet coming to these days...
I know, really. Sheesh! Jeff, I won't stand for that! Argue with me! :-)
--
Erik Max Francis && [EMAIL P
even
reasonable people into demonstrating technical ignorance have precisely
the same problem: The desired technical context is not made clear and
so that the supposedly-wrong answer is not only unsurprising, but often
arguably correct. This kind of stuff is little more than a s
ach physics than
this, because these misunderstanding are not wrong in any meaningfully
useful way.
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It isn't importa
Dennis Lee Bieber wrote:
> On Tue, 12 Feb 2008 00:18:38 -0800, Erik Max Francis <[EMAIL PROTECTED]>
> declaimed the following in comp.lang.python:
>
>> equivalence for everyday usage and make no requirement of using the
>> "proper" units for mass (kg) vs.
ethod.
> Go ahead and implement your protocol using attributes with plain
> names. What makes it a protocol is that it's likely to be generally
> applicable, and the names are chosen to apply to other classes equally
> well.
Agreed.
--
Erik Max Francis && [EMAIL PROTECTED]
greg wrote:
> Erik Max Francis wrote:
>> My point was, and still is, that if this question without further
>> context is posed to a generally educated laymen, the supposedly wrong
>> answer that was given is actually _correct_.
>
> Except that they probably don&#
systems for
dealing with the pound and its brethren, and different people are taught
different things and are perpetually confused. And not much good comes
of it.
And the rest of us just use SI. (And if you bring up the
_kilogram-force_, I'll just cry.)
--
Erik Max Francis &
Dotan Cohen wrote:
> On 13/02/2008, Erik Max Francis <[EMAIL PROTECTED]> wrote:
>> And the rest of us just use SI. (And if you bring up the
>> _kilogram-force_, I'll just cry.)
>
> Don't cry, I just want to say that I've hated the kilogram-force
&
I V wrote:
> On Mon, 11 Feb 2008 14:07:49 -0800, Erik Max Francis wrote:
>> experience. The notion of impetus -- where an object throw moves in a
>> straight line until it runs out of impetus, then falls straight down --
>> is clearly contrary to everyday experience of watc
ecific impulse) is measured in
seconds, as it's the ratio of the the thrust (force) to rate of fuel
usage (would be mass divided by time, but weight on Earth is used
instead of mass).
Basically, physics rationalizations of Imperial/English/American
(whatever you choose to call
on due to gravity is a
pound. The acceleration due to gravity is only approximately 32 ft/s^2,
so you were just remembering the short-hand approximation for 1 gee.
Let's hear it for incoherent unit systems ...
--
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for it) zepto-. The electron-volt is about 160 zJ (zeptojoules).
--
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You are the lovers rock / The rock that I cling to
-- Sade
--
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Tobiah wrote:
>>>> print float(3.0) is float(3.0)
> True
>>>> print float(3.0 * 1.0) is float(3.0)
> False
>>>>
It's implementation dependent what values these expressions will take.
If you're trying to test equality, use `==`, not `is`
or
something?
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One cannot always be a hero, but one can always be a man.
-- Goethe
--
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ed on for my own amusement a while back but never got
far enough to do anything useful at all, given the size of the task.
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then C is a
> good choice. More portable than assembler but nearly as close to the
> metal.
>
> To the OP: If you try C++, don't hold that crappy language against C#, D,
> or Java. ;-)
He was talking about C++, not C. Jeff has quite a good point; teaching
C++ as C is not terribly
l.
No, of course not, since logically you must think all software is useless.
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Life is a zoo in a jungle.
-- Peter de Vries
--
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Mensanator wrote:
> On Mar 3, 11:58 pm, Erik Max Francis <[EMAIL PROTECTED]> wrote:
>> Mensanator wrote:
>>> I'm not hard to please at all.
>> No, of course not, since logically you must think all software is useless.
>
> Somehow, I expected bet
>>> print em.expand(myOutput, globals())
The total cost is $123.45.
This order will be shipped to Jack McCoy at the following
address:
1 Police Plaza
New York City, NY
This order was generated at Thu Mar 6 18:41:58 2008
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There's a reason why we / Keep chasing morning
-- Sandra St. Victor
--
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Chris wrote:
> No output because x is a NoneType...
That's behavior of the interactive interpreter when printing results of
expressions, not of print. It will print None.
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re not doing a useful test here.
In Python, bound methods are dynamically generated.
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There is no present or future; only the pa
[EMAIL PROTECTED] wrote:
> 'join' in the wrong word for the method in class Thread.
That's the standard term in threading. If it's not familiar to you,
well, bummer, but there's not much more that can be done about that than
for you to read the literature.
--
ional
programming language syntax. In the big picture I don't think it helps
much. After all, there's a reason that most modern programming
languages don't look like COBOL or AppleScript.
--
Erik Max Francis && [email protected] && http://www.alcyone.com/max/
S
alex23 wrote:
On Jan 16, 5:39 pm, Erik Max Francis wrote:
Inform 7 has some
interesting ideas, but I think the general problem with English-like
programming language systems is that once you get into the nitty gritty
details, you end up having to know exactly the right things to type,
This
x27;t require parentheses at all, since functions
("procedures") take a fixed number of arguments. Parentheses are only
required when you're adding optional arguments.
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San Jose, CA, USA &
have been nice to be able to do that.
Look up the function call syntaxes with * and **:
>>> def foo(*args): print args
...
>>> def bar(**keywords): print keywords
...
>>> foo(1, 2, 3)
(1, 2, 3)
>>> bar(a=1, b=2, c=3)
{'a': 1, 'c'
there
is some keyword that I don't know about.
No. The assignment operator with a bare name on the left hand side is
not overridable.
You can override attribute access, however, with
.__getattr__/.__getattribute__.
--
Erik Max Francis && [email protected] && http://www.
element is apparently
being promoted to "bytes" as soon as it comes out of the array.
There's no distinction byte type. A single character of a bytes type is
also a bytes.
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Did you ever love somebody / Did you ever really care
-- Cassandra Wilson
--
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ime for the same reason. It isn't going to happen.
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There are not fifty ways of fighting, there is only one: to be the
7;t.
Is "@" a "speaking identifier? How about "#" and "!="? Last I heard,
they were all part of Python.
None of these are identifiers at all. You might want to read up on the
language reference to see what an identifier actually is.
--
Erik Max Francis
Filip Gruszczyński wrote:
I would like to iterate over a sequence nad ignore all None objects.
The most obvious way is explicitly checking if element is not None,
but it takes too much space.
That doesn't make much sense; why would iterating over the sequence take
more _space_?
--
Eri
that matter.
--
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God grant me to contend with those that understand me.
-- Thomas Fuller
--
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nature, but why the interpreter
refused to do that ?
Because, as in most languages, it's not even clear what you might mean
by this syntax. It doesn't have any meaning; assignments are made to
variables, not the results of function calls.
--
Erik Max Francis && m...@al
iously doesn't say anything
about which "objects" are the same as each other.
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Scars are like memories. We d
Derek Martin wrote:
On Fri, Jan 02, 2009 at 12:50:44PM -0800, Erik Max Francis wrote:
Identity isn't defined on math objects, only on Python objects; there
is no notion of 'is' in math.
This is also false, it even has its own operator (which requires
Unicode to display): ≡
dentity and the computer scientific ones (especially since
the term _identity_ isn't even used in remotely the same way) is simply
ignoring the fact that other people either won't know what you mean or
will presume you're misunderstanding something. Because, based on your
ed, and it's not useful anyway;
what you care about is whether two objects are equal or not, not whether
they're the same object through some optimization behind the scenes.
--
Erik Max Francis && [email protected] && http://www.alcyone.com/max/
San Jose, CA, USA && 37 18 N 121 57 W && AIM, Y!M erikmaxfrancis
All delays are dangerous in war.
-- John Dryden, 1631-1700
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http://mail.python.org/mailman/listinfo/python-list
make two widgets, how
many widgets can five men make in two weeks?").
--
Erik Max Francis && [EMAIL PROTECTED] && http://www.alcyone.com/max/
San Jose, CA, USA && 37 18 N 121 57 W && AIM, Y!M erikmaxfrancis
Those who forget the past are condemned to repeat
not so good one. People like
Python because of his simplicity in comparison with c++. Maybe People
would like him even more it would be a bit more simple but the same
powerfull.
The problem is your suggestion would make Python a worse tool, not a
better one.
--
Erik Max Francis && [EMA
Lawrence D'Oliveiro wrote:
gavino wrote:
which is nicer?
If I were to lock you and INTERCAL in a room until only one is left alive, who
do you think would survive?
The rest of us.
--
Erik Max Francis && [EMAIL PROTECTED] && http://www.alcyone.com/max/
San Jose, C
(non-spam) posts is steadily dropping
over time.
If you look at http://mail.python.org/pipermail/python-list/ it doesn't
make it clear that there is any sort of decline.
...
And made all purdy-like:
http://www.alcyone.com/tmp/python-list%20traffic.pdf
--
Erik Max Francis &
rating over a single object, so successive
calls to .next give you success iteration values like you intended.
--
Erik Max Francis && [email protected] && http://www.alcyone.com/max/
San Jose, CA, USA && 37 18 N 121 57 W && AIM, Y!M erikmaxfrancis
We must all
python.org describes their functionality in detail.
--
Erik Max Francis && [email protected] && http://www.alcyone.com/max/
San Jose, CA, USA && 37 18 N 121 57 W && AIM, Y!M, Skype erikmaxfrancis
The hour which gives us life begins to take it away.
-- Seneca
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