sed by changes in sys.argv. (There is no change in sys.argv, it's
just a list of strings, the same as it always was.)
P.S. it's remarkably, and deceptively, difficult to correctly benchmark
code. The best way is to take your actual application, give it some real
world data to process, and time how long it takes.
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hat this LiClipse is all about?
No idea. Who did you get the message from? Perhaps you should ask them.
Or ask on an Eclipse forum. Or try googling for "Liclipse", which brings
me to this:
http://www.indiegogo.com/projects/pydev-and-liclipse-for-a-fast-sexy-and-
dark-eclipse
--
om your email disclaimer that you are emailing from a company.
Does your company have a Windows system administrator? If so, perhaps he
or she could shed some light on what's going on? (I don't use Windows, so
I'm a little lost myself.)
Good luck!
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)
>>> grouped(items, lambda x: x % 2)
{0: [0, 2, 4, 6, 8], 1: [1, 3, 5, 7, 9]}
>>> items = 'hello stack overflow how are you'.split()
>>> grouped(items, len)
{8: ['overflow'], 3: ['how', 'are', 'you'], 5: ['hello', 'stack']}
"""
result = {}
for item in iterable:
result.setdefault(key(item), []).append(item)
return result
Now you have a nice, descriptive help string for when you call
help(grouped).
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lines are exactly the same in Python 2,
where Print is not a function!
> You are using Python 3. In Python 3, "print" is a function that returns
> None. So, the error is exactly correct. To fix it, you need to have
> the % operator operate on the string, not on the resu
On Sat, 23 Mar 2013 09:57:48 -0600, Michael Torrie wrote:
> On 03/23/2013 01:38 AM, Steven D'Aprano wrote:
>> Just to add confusion, the two lines are exactly the same in Python 2,
>> where Print is not a function!
>
> Perhaps this is a good reason use the slightly mor
he object, as returned by the C compiler, as the ID. But
since there is no way to dereference an id, or lookup the object found at
an id, it is not an address. It merely has the same numeric value as what
the C compiler sees as the address.
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you need something like this:
a = "bar"
b = "".join(["b", "a", "r"])
although of course a sufficiently smart keyhole optimizer could recognise
that as a constant as well. This, on the other hand, will defeat it:
b = str("ba") + str("r")
because the keyhole optimizer cannot tell whether str() is still the
built-in function or has been replaced by something else.
> but, again, none of this is guaranteed.
Correct.
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is no real consensus. Those who don't do
serious floating point work hate NANs, those who do are split between
loving NANs and merely tolerating them because the IEEE standard requires
them, but pretty much everyone agrees that containers should be free to
assume identity implies equality.
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hough
I'm too lazy to look them up to check for sure.
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the current directory will contain a file "collections.py" which
will shadow the standard library collections.py. So don't do that.
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fter, the size of the object itself, including any
overhead?
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On Mon, 25 Mar 2013 00:10:04 -0500, Fabian von Romberg wrote:
> Hi Steven,
>
>
> actually why I need is to know how much memory has been allocated for
> buffering.
>
> getsizeof gets the size of the object structure.
I can see at least four ways to get the current size o
like to see though is a module where I can import fixed-
width signed and unsigned integers that behave like in C, complete with
overflow, for writing code that matches the same behaviour as other
languages.
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On Mon, 25 Mar 2013 20:55:03 -0400, Roy Smith wrote:
> In article <[email protected]>,
> Steven D'Aprano wrote:
>
>> Also, speaking as somebody who remembers a time when ints where not
>> automatically promoted to longs (in
function scopes;
look in the global scope;
look in the builtins.
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lt-in programming language Hypertalk let you do things
like this:
go to stack "Notepad"
type "goodbye cruel world" in field "main" of card 7
click button "Save"
click button "Quit" of card "Main" of stack "Excel"
(more or less... it's been a few years since I've had a classic Mac
capable of running Hypercard.)
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ule also initialises a private instance, and
exposes the methods of that instance as top-level functions, to cover the
90% simple case where your application only cares about a single RNG.
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should be merely loosely coupled, no
different from any other modules in sys.path. If your modules are tightly
coupled, they should go in a package.
One thing which would make import manipulations much easier would be if
import (and __import__) took an explicit search path, as opposed to
operati
shes with
the collections in the standard library, there's no simple way to bypass
his package and find the standard library collections module. When you
have two top-level modules/packages with the same name, whichever one
comes first in sys.path will shadow the second one.
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d
> on it; if you can switch to 3.3.0 (the latest 3.x release), that would
> actually fix your exec problem, for what that's worth. (Moving to 3.3.0
> would be a much bigger change, though, and one that's likely to require
> code edits.)
If the OP's code uses string exceptions:
raise "an error occurred"
they will need to be replaced before migrating to 2.7.
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> which requires access to several MyClass vars. Not clear on the
> syntax/usage with this approach here, any guidance would be greatly
> appreciated!
It's not clear what you actually need to do, so I can't give you any more
guidance apart from the sort of thing that is possible with decorators.
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On Wed, 27 Mar 2013 02:34:09 -0700, Michael Herrmann wrote:
> On Tuesday, March 26, 2013 11:37:23 PM UTC+1, Steven D'Aprano wrote:
>>
>> Global *variables* are bad, not global functions. You have one global
>> variable, "the current window". So long as y
1:51 PM UTC+10, rusi wrote:
Eight levels of attribution. And I count up to nine levels of quoting.
Doesn't anyone have a working backspace key in their editor? Please trim
your responses to what's needed to establish context, there's no need to
keep the entire thread duplicated in every post.
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I also suggest you go and moan at Steven D'Aprano who called the idiot a
> liar. Although thinking about it, I prefer Steven's comment to my own
> as being more accurate.
Yes I did, I suggest you reflect on the difference in content between
your post and mine, and why your
lass attribute"
>>
>> def __init__(self, y):
>> self.y = y
>>
>>
> In the spirit of nit-picking, I'll point out that Steven meant to use
> the 'class' keyword instead of 'def' for MyClass.
/face-palm
So I did. Thanks for picking the nit.
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a matter of honest misunderstanding or even mere
difference of opinion.
As an Australian, I am constitutionally required to call a spade a bloody
shovel at least twice a week, so I have no regrets.
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e as to the best way to make it clear to them that
they are not welcome so long as they continue their behaviour.
[1] Although sadly, given the reality of communication on the Internet,
sometimes kill-filing is the least-worst option.
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do it with
maths, and get an exact result.
dC/dQ = 3*Q**2 - 30*Q + 93
d²C/dQ² = 6*Q - 30
The rule for differentiating polynomials of the form
y = k*x**n
is:
dy/dx = (k*n)*x**(n-1)
Consult a good calculus text book or on-line site for further details.
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n is that it is, on average,
> more compact over a wide set of samples.
Sure. And over a different set of samples, it is less compact. If you
write a lot of Latin-1, Python will use one byte per character, while
UTF-8 will use two bytes per character.
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at could need surrogate pairs,
and they don't need them in Python's implementation since it's a full 32-
bit implementation. So where do the surrogate pairs come into this?
I also wonder why the implementation bothers keeping a UTF-8
representation. That sounds like premature op
take it under advisement.
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On Fri, 29 Mar 2013 11:54:41 +1100, Chris Angelico wrote:
> On Fri, Mar 29, 2013 at 11:39 AM, Steven D'Aprano
> wrote:
>> ASCII and Latin-1 strings obviously do not have them. Nor do BMP-only
>> strings. It's only strings in the SMPs that could need surrogate pairs,
safe to use as an int
print(value + 1)
[...]
> And everything seems to work, but appear other questions. If original
> function return different types - what to do in this case? Where i am
> wrong? What other way to do that. Was no idea to create keyword 'lazy'
> in Python?
fum()
else:
raise SomeException
> What I'm trying to avoid is this:
>
> if expression1.match(line):
> results = expression1.match(line)
>
> which I assume would call the regex match against the line twice
Correct.
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) (and all other commands)
> and display them to the user?
Automatically? I don't believe so. I think it is hard-coded behaviour of
the interactive interpreter, and cannot by enabled for scripts.
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t Java -- but it is actively harmful terminology
(in Python at least, if not in general) and whoever invented it is bad
and should feel bad.
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illion trillion trillion trillion trillion trillion
trillion trillion trillion trillion trillion trillion trillion trillion
trillion trillion trillion trillion trillion trillion trillion trillion
trillion trillion trillion trillion trillion trillion digits.
(American billion and trillion, 10**9 and 10**12 respectively.)
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00 + 'ẞ'")
[1.8083378580026329, 1.818592812011484, 1.7922867869958282]
Python 3.2, ASCII vs Non-ASCII:
py> timeit.repeat("'a' * 1000 + 'z'")
[1.756322135925293, 1.8002049922943115, 1.721085958480835]
py> timeit.repeat("'a' * 1000 + 'ẞ'")
[1.7209150791168213, 1.7162668704986572, 1.7260780334472656]
In other words, if you stick to non-ASCII strings, Python 3.3 is no
slower than Python 3.2.
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ponentiation is not commutative:
2**3 != 3**2
nor is it associative:
2**(3**2) != (2**3)**2
so I'm not really sure what you are trying to say here.
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remaining positional arguments, which means that
the timeout argument is keyword only.
So try this:
future_to_url = executor.map(str, lst100, timeout=60)
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a straightforward choice. An example will illustrate:
>
> I can choose to drive or not -- a choice. Statistics tell me that on
> average there are 3 fatalities every day; I am very concerned that I
> could get killed so I choose not to drive. Which neglects that there are
> a couple of million safe-drives at the same time as the '3 fatalities'
Clear as mud. What does this have to do with supporting Unicode?
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ectness.
>
> That works out to 0.03%. Of course I assume it is US only data.
> Still its good to know how skew the distribution is.
If the data included Japanese names, or used Emoji, it would be much
closer to 100% than 0.03%.
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On Mon, 01 Apr 2013 08:15:53 -0400, Roy Smith wrote:
> In article <[email protected]>,
> Steven D'Aprano wrote:
>
>> [...]
>> >> OK, that leads to the next question. Is there anyway I can (in
>> >> Python 2.
ore it's critical that
we reply instantly.
*wink*
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artist,
> breaks most search tools.
As far as I'm concerned, anyone in the 21st century who names themselves
or their work (a movie, book, programming language, etc.) something which
breaks search tools is just *begging* for obscurity, and we ought to
respect their wishes.
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an, and come back with any
further questions *after* making a good effort.
Another hint: try experimenting at the interactive interpreter, or IDLE.
If you're unsure about something, try it and see what happens *before*
asking.
Good luck.
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in
MemoryError
(while the above code was running, my computer got slower and slower and
slower, and potentially it could have locked up completely).
So the general advice is, treat the input() function as For Experts Only,
and always use raw_input() instead.
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F-8, it won't magically turn the Latin-1 file into
UTF-8. Instead you'll get bytes being decoded wrongly.
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character
instead of 0.1 second? That's still a hundred times faster than you
can type.
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time. Real-world
benchmarks of actual applications demonstrate this. One or two trivial
slowdowns of artificial micro-benchmarks simply are not important, even
if they are genuine. I believe they are genuine, but likely operating
system and hardware dependent.
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ponding on-list with a follow-up, and I'm sorry that nobody
was able to give you any useful answers. If you do find a solution, work-
around or even just an explanation, please consider replying again with
an answer.
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s:
http://numericalrecipes.wordpress.com/2009/05/25/signature-preserving-
function-decorators/
Good luck!
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. There is no meaningful difference in
speed between the two versions.
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k.
I am not the maintainer of the datetime module, but based purely on what
you have said, I would consider that a bug. I suggest you report it as an
issue on the Python bug tracker.
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e's probably also a way to do it using ctypes.
> The system already knows what the size is, I was hoping for an
> uber-quick inspection of the string header.
I'm not sure that I would want strings to have a method reporting this,
but it might be nice to have a function in the inspect module to do so.
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language
promise, but I can't seem to find it documented anywhere official.
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t; I'm reasonably sure all() is smart enough to stop at the first False
> value.
Yes, all() and any() are guaranteed to be short-circuit functions. They
will stop as soon as they see a False or a True value respectively.
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rt from pure
intellectual curiosity, but sure, post a feature request. Be sure to
mention that Pike supports this feature.
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__(self):
self.engine = Engine()
def go(self): ...
and then both cars and boats can *delegate* behaviour to the engine
object.
So, if you think of "Visitable" as a gadget that can be strapped onto
your MyObj as a component, then composition is probably a better design.
But if you think of "Visitable" as a mere collection of behaviour and
state, then a mixin is probably a better design.
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On Wed, 03 Apr 2013 10:38:20 -0600, Ian Kelly wrote:
> On Wed, Apr 3, 2013 at 9:02 AM, Steven D'Aprano
> wrote:
>> On Wed, 03 Apr 2013 09:43:06 -0400, Roy Smith wrote:
>>
>> [...]
>>>> n = max(map(ord, s))
>>>> 4 if n > 0x else 2 i
cters. (Strictly speaking, 79
characters.)
Here is a good defence of 80 char lines:
http://wrongsideofmemphis.com/2013/03/25/80-chars-per-line-is-great/
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es:
# 80 characters, not 79. Oh well.
font = wx.Font(12, wx.DEFAULT, wx.NORMAL, wx.BOLD, faceName="FreeSans")
self.mainLabel.SetFont(font)
And finally, when all is said and done, the most important rule from PEP 8
applies: know when to break the rules.
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should be no greater than 79 halfwidth characters, or 39
fullwidth characters, or some combination thereof.
http://en.wikipedia.org/wiki/Halfwidth_and_fullwidth_forms
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Sorry for the noise.
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e__.startswith('idlelib')
Ideally, I'd like to detect any arbitrary environment such as Spyder,
IPython, BPython, etc., but will settle for just IDLE.
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On Fri, 05 Apr 2013 07:04:35 -0400, Dave Angel wrote:
> On 04/05/2013 05:30 AM, Steven D'Aprano wrote:
>> (Apologies in advance if you get multiple copies of this. My Usenet
>> connection seems to be having a conniption fit at the moment.)
>>
>> I'm loo
deserializes it doesn't set all that up. Thanks,
What's the object's ctor? What sort of objects are you dealing with?
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eggs():
\t\tprint("indented with two tabs")
spam()
eggs()
"""
exec(code)
=== cut ===
If it were my language, I would be even stricter about indentation than
Python 3. I would require that each file use *only* tabs, or *only*
spaces, and not allow both in the same file.
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On Fri, 05 Apr 2013 18:18:51 -0600, Littlefield, Tyler wrote:
> On 4/5/2013 2:30 PM, Steven D'Aprano wrote:
>> On Fri, 05 Apr 2013 12:59:04 -0600, Littlefield, Tyler wrote:
>>
>>> Hello all:
>>> I've been using Python for a while now, but I h
. (I use a lot of top-level functions, and few classes). With
an average line length of 50 characters, plus indentation, we can reduce
the size of a typical Python module by ninety-seven percent!
Of course, what we save in disk space, we lose in monitor size, but I'm
sure that the price o
man.linuxchix.org/pipermail/programming/2004-August/001433.html
Maybe if we had smarter editors and smarter diffs and smarter tools in
general, it wouldn't be a problem. But we don't, so it is.
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e:
???
>- it's a very uncommon need
Well, that at least is true. But then, needing to know the platform
you're running under, the size of objects, the id of a object, the
largest integer, the largest float, or the number of references seen by
the garbage collector are also uncommon needs. What really matters is not
how often you need it, but what you can do when you need it if you don't
have it.
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predates the "rule" that tab stops are every
8 characters.
If your editor doesn't support setting tab stops to at least single pixel
resolution, it's not supporting tabs, it's supporting something else that
it merely calls "tabs".
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ge blocks of running text.
> Program text is almost always(*) displayed in a fixed-width font. No
> font information is carried along with the program text at all; it is
> assumed the reader will pick a font and size of their own preference,
And tab settings.
If you're going to comp
On Sat, 06 Apr 2013 19:58:02 -0600, Ian Kelly wrote:
> On Sat, Apr 6, 2013 at 7:29 PM, Steven D'Aprano
> wrote:
>> For some definition of "easily".
>>
>> if implementation == "CPython":
>> if version < "3.3":
>>
def method(self, arg):
return {arg: self}
import types
x.method = types.MethodType(method, x)
x.method("hello")
=> returns {'hello': <__main__.Spam object at 0xb7bc59ac>}
Does this help?
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with new.instancemethod to this:
self.to_binary = types.MethodType(to_binary, self)
and see if it works. If it complains about the call to exec, then change
that part of the code to this:
ns = {}
exec(code, ns)
to_binary = ns['to_binary']
self.t
need to do it from the class. The behaviour
> you observe is normal and cannot be overriden.
All very well and good, but how about putting Nick out of his misery and
showing how to do it?
print(obj.__class__.mem.__doc__)
ought to work.
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ases = [words[i:i+2] for i in range(0, len(words), 2)]
4) Join the phrases into strings.
phrases = [' '.join(phrase) for phrase in phrases]
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ple they can do whatever they
want with my software! Nothing can possibly go wrong!"?
Use a known, tested, working solution, and save yourself the pain.
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t THREE AND A HALF PAGES of quoted text to
see a two line response.
Thank you.
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d also work through a tutorial or two. Also the "Module of the
week" website is very good:
http://pymotw.com
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received:", arg+1000
...
py> Test.method = method
py> t.method(23)
argument received: 1023
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thon 3.3, the _io module is now built-in into the
compiler, so _io.__file__ no longer exists.
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program, but also the smallest program in terms of number of non-white
pixels.
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On Mon, 08 Apr 2013 19:43:51 +0100, Nobody wrote:
> On Sun, 07 Apr 2013 01:30:45 +0000, Steven D'Aprano wrote:
>
>> Am I the only one here who has used a typewriter?
>>
>> Tab stops were set manually, to a physical distance into the page,
>> using a mechanical
on't understand your question. The reason for using inheritance is to
reduce the amount of duplicated code. If you're ending up with more code,
you're doing something wrong. You're probably badly designing your
methods, or your classes, or both. If you give a less contrived example,
perhaps we can help.
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FOUR PAGES of quoted text just to get to a two
line response.
Thank you.
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On Mon, 08 Apr 2013 21:06:42 -0700, rusi wrote:
> On Apr 9, 7:51 am, Steven D'Aprano [email protected]> wrote:
>> On Mon, 08 Apr 2013 19:43:51 +0100, Nobody wrote:
>> > On Sun, 07 Apr 2013 01:30:45 +, Steven D'Aprano wrote:
>>
>&g
for their purpose in many
jurisdictions. In some places that may only apply if money changes hands;
in other places it will apply regardless.
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anywhere you can use a NwInvDb database object, you can use
a Device object.
And the same would apply to every other concept in the database.
That does not sound like a clean and useful design to me.
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ives you a car, only the brake lines have been disconnected
and you're seriously injured the first time you drive it, you also have
standing to sue that she gave you a car that was unfit for the purpose it
was designed.
> Where does everyone
> come up with these bullshit ideas?
I
ovus Ordo Seclorum bullshit.
You've dropped your tinfoil hat. Watch out, the CIA will start beaming
thoughts into your head.
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e
and warranty disclaimer is best.
It's just damn common sense that, when faced with a legal issue, you ask
a legal expert, not a programmer or a butcher or a candle-stick maker.
http://demotivationalblog.com/demotivational/2010/03/common-sense.jpg
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Steven
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n the car manufacturer. Some places might reason that you can sue both,
and it is up to the court to decide what percentage of responsibility
each party must take. Which case it is will depend on the laws of
whichever place has legal jurisdiction.
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Steven
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ur currency that YOU have accepted. Egyptian
>> pyramids on the U.S. dollar? All seeing eye?
>
> I'm sorry, I'm somewhat lost here. The dollar I have here has a mob of
> animals on one side and someone's face on the other - no pyramids, no
> all-seeing-eye.
It must be c
On Tue, 09 Apr 2013 02:29:43 -0700, Mark Janssen wrote:
> Well, out here in the good ol' USA, there no "duty of care"
That explains a lot.
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xpected errors, and ignore them? If you're
absolutely sure that this is the right thing to do, then:
try:
code_goes_here()
except Exception:
pass
But really, you shouldn't do this.
(For experts only: you *probably* shouldn't do this.)
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On Tue, 09 Apr 2013 18:20:04 +0800, 小学园PHP wrote:
> I need to use the python httplib.
>
> And i code two sample, the first works, not the second.
>
> But what i need is the second.
>
> In the second sample, the data seems not be sent correctly.
>
> I want to know where is the problem in the se
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