hat already exist in the python ecosystem?
b) can anybody see any flaw either in what I'd like to do ("you
shouldn't do that because...") or in the way I want to do it ("It
won't work because...")
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et further into Python.
Good luck.
Alan
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ht work as well
(call the method and see whether it crashes) and I may finally pick
that approach, but I'd like not to clutter my code with explicit
try...except blocks. The very same approach might help.
The chance for signature mismatch is of course high when using
extreme runti
e_implemented_by(oo) # -> True
MyInterface.maybe_implemented_by(to) # -> True
MyInterface.maybe_implemented_by(SomeObj) # -> True
That's just what I'd like and I suppose can't be currently done with
current ABC, PyProtocols or zope.interface implementations, right?
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ant.
Yes, __instancecheck__ could be used as an alternative hook with
respect to maybe_implemented_by(), but there's no such logic for
signature checking. That's a minor detail, I think.
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--
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On Thu, Jan 27, 2011 at 8:03 PM, Alan Franzoni wrote:
> Yes, __instancecheck__ could be used as an alternative hook with
> respect to maybe_implemented_by(), but there's no such logic for
> signature checking. That's a minor detail, I think.
On the contrary, now that I doubl
.
def method1(self, c, d):
...
could satisfy or not the very same interface, depending whether the
args are passed as postional or kw.
--
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nstead. Maybe some stack
analysis could be performed, but I'd prefer to check as much as I can
*before* calling.
- Sometimes I'd like to group objects depending on their *behaviour*
(not their type), and then feed them somewhere else without actually
calling their methods. If I can know thei
t yes,
__instancecheck__ on an ABC can actually be used in place of
maybe_implemented_by and hooking into isinstance().
Thanks!
--
Alan Franzoni
--
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IX utility "tail"
and see how they do it. It seems to work with equal speed no matter how
large the file is and I suspect it uses MRAB's solution, but because
it's written in C, it probably examines each character directly rather
than calling a library routine like
hire anyone, I'm just a programmer myself. But
I'm curious about rates in India vs. the U.S., where I live and work.
Thanks and good luck with your efforts to get work.
Alan
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pened?
We need a bit more context and you need to do a bity more debugging.
Starting with getting rid of the bitwise and "trick" from C. All it does
here is make it hard to understand whats happening.
HTH,
Alan G.
Author of the Learn to Program web site
http://www.alan-g.me.uk/
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good reason to use them, I am all for it, though.
All advice appreciated,
Thanks,
Alan
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ator, even
though it could expose the very same interface as a builtin, yield-based
generator.
I think it would be pretty useful.
comments?
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Alan Franzoni
contact me at pub...@[mysurname].eu
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On 5/19/10 7:24 PM, Carl Banks wrote:
> collections.Iterator
That would just support the next() method. But enhanced generators
interface - supporting coroutines as well - include send(), throw() and
close().
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Alan Franzoni
contact me at pub...@[mysurname].eu
--
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I couldn't find a good algorithms forum on the Internet, so I guess
I'll ask this question here instead: Is it possible to efficiently
maintain a binary search tree in a flat array (i.e., without using
pointers), as is typically done for a binary heap?
It *is* possible, of course, to keep an order
On Jul 13, 3:57 pm, a...@pythoncraft.com (Aahz) wrote:
> Still, unless your list is large (more than thousands of elements),
> that's the way you should go. See the bisect module. Thing is, the
> speed difference between C and Python means the constant for insertion
> and deletion is very very s
On Jul 14, 7:38 am, Florian Brucker wrote:
> Douglas Alan wrote:
> > Thank you. My question wasn't intended to be Python specific, though.
> > I am just curious for purely academic reasons about whether there is
> > such an algorithm. All the sources I've skimmed
On Jul 14, 8:10 am, Piet van Oostrum wrote:
> Of course you can take any BST algorithm and replace pointers by indices
> in the array and allocate new elements in the array. But then you need
> array elements to contain the indices for the children explicitely.
And why is this a problem? This is
On Jul 14, 9:19 am, Scott David Daniels wrote:
> It may well be that there is no good simple solution, and people avoid
> writing about non-existent algorithms.
I can't imagine why that should be the case. The CLRS textbook on
algorithms, for instance, goes to some pains to mathematically prove
I wrote:
> On Jul 14, 8:10 am, Piet van Oostrum wrote:
>
> > Of course you can take any BST algorithm and replace pointers by indices
> > in the array and allocate new elements in the array. But then you need
> > array elements to contain the indices for the children explicitely.
> And why is t
A friend of mine is just learning Python, and he's a bit tweaked about
how unrecognized escape sequences are treated in Python. This is from
the Python 3.0 reference manual:
Unlike Standard C, all unrecognized escape sequences are left in
the string unchanged, i.e.,
the backslash is left
Steven D'Aprano wrote:
> Why should a backslash in a string literal be an error?
Because in Python, if my friend sees the string "foo\xbar\n", he has
no idea whether the "\x" is an escape sequence, or if it is just the
characters "\x", unless he looks it up in the manual, or tries it out
in the R
On Aug 9, 8:06 pm, Steven D'Aprano wrote:
> while the behaviour your
> friend wants is "treat a backslash as an error, except for these
> exceptions".
Besides, can't all error situations be described as, "treat the error
situation as an error, except for the exception of when the situation
isn't
On Aug 10, 2:03 am, Steven D'Aprano
wrote:
> On Sun, 09 Aug 2009 17:56:55 -0700, Douglas Alan wrote:
> > Because in Python, if my friend sees the string "foo\xbar\n", he has no
> > idea whether the "\x" is an escape sequence, or if it is just the
>
On Aug 10, 2:10 am, Steven D'Aprano
> I've never had any errors caused by this.
But you've seen an error caused by this, in this very discussion.
I.e., "foo\xbar".
"\xba" isn't an escape sequence in any other language that I've used,
which is one reason I made this error... Oh, wait a minute --
On Aug 10, 4:37 am, Steven D'Aprano
> There is at least one good reason for preferring an error, namely that it
> allows Python to introduce new escape codes without going through a long,
> slow process. But the rest of these complaints are terribly unconvincing.
What about:
o Beautiful is b
On Aug 10, 10:58 am, Scott David Daniels
wrote:
> The string rules reflect C's rules, and I see little
> excuse for trying to change them now.
No they don't. Or at least not C++'s rules. C++ behaves exactly as I
should like.
(Or at least g++ does. Or rather *almost* as I would like, as by
defau
From: Steven D'Aprano wrote:
> On Mon, 10 Aug 2009 00:32:30 -0700, Douglas Alan wrote:
> > In C++, if I know that the code I'm looking at compiles,
> > then I never need worry that I've misinterpreted what a
> > string literal means.
> If you don't k
On Aug 11, 2:00 pm, Steven D'Aprano wrote:
> > test.cpp:1:1: warning: unknown escape sequence '\y'
>
> Isn't that a warning, not a fatal error? So what does temp contain?
My "Annotated C++ Reference Manual" is packed, and surprisingly in
Stroustrup's Third Edition, there is no mention of the iss
Steven D'Aprano wrote:
> Because the cost isn't zero. Needing to write \\ in a string
> literal when you want \ is a cost,
I need to preface this entire post with the fact that I've
already used ALL of the arguments that you've provided on my
friend before I ever even came here with the topic, an
On Aug 10, 11:27 pm, Steven D'Aprano
wrote:
> On Mon, 10 Aug 2009 08:21:03 -0700, Douglas Alan wrote:
> > But you're right, it's too late to change this now.
>
> Not really. There is a procedure for making non-backwards compatible
> changes. If you care deeply eno
On Aug 11, 4:38 pm, Ethan Furman wrote:
> Mind you, I'm not really vested in how Python *should* handle
> backslashes one way or the other, but I am glad it has rules that it
> follows for consitent results, and I don't have to break out a byte-code
> editor to find out what's in my string litera
I wrote:
> But you're right, it's too late to change this now.
P.S. But if it weren't too late, I think that your idea to have "\s"
be the escape sequence for a backslash instead of "\\" might be a good
one.
|>ouglas
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On Aug 12, 3:08 am, Steven D'Aprano
wrote:
> On Tue, 11 Aug 2009 14:48:24 -0700, Douglas Alan wrote:
> > In any case, my argument has consistently been that Python should have
> > treated undefined escape sequences consistently as fatal errors,
>
> A reasonable positio
On Aug 12, 3:36 am, Steven D'Aprano
wrote:
> On Tue, 11 Aug 2009 13:20:52 -0700, Douglas Alan wrote:
> > My "Annotated C++ Reference Manual" is packed, and surprisingly in
> > Stroustrup's Third Edition, there is no mention of the issue in the
> > entire
On Aug 12, 5:32 am, Steven D'Aprano
wrote:
> That problem basically boils down to a deep-seated
> philosophical disagreement over which philosophy a
> language should follow in regard to backslash escapes:
>
> "Anything not explicitly permitted is forbidden"
>
> versus
>
> "Anything not explicitl
On Aug 12, 7:19 pm, Steven D'Aprano wrote:
> You are making an unjustified assumption: \y is not an error.
You are making in an unjustified assumption that I ever made such an
assumption!
My claim is and has always been NOT that \y is inately an error, but
rather that treating unrecognized esca
On Aug 14, 12:17 pm, Grant Edwards wrote:
> On 2009-08-14, Steven D'Aprano wrote:
> > On Fri, 14 Aug 2009 07:07:31 -0700, Aahz wrote:
> >> "I saw `cout' being shifted "Hello world" times to the left and stopped
> >> right there." --Steve Gonedes
>
> > Assuming that's something real, and not i
On Aug 14, 10:25 pm, Dave Angel wrote:
> Benjamin Kaplan wrote:
> > On Fri, Aug 14, 2009 at 12:42 PM, Douglas Alan wrote:
> >> P.S. Overloading "left shift" to mean "output" does indeed seem a bit
> >> sketchy, but in 15 years of C++ programming,
On Aug 14, 1:55 pm, Steven D'Aprano wrote:
> Douglas, you and I clearly have a difference of opinion on
> this. Neither of us have provided even the tiniest amount
> of objective, replicable, reliable data on the
> error-proneness of the C++ approach versus that of
> Python. The supposed superior
On Aug 15, 5:32 pm, Jaseem wrote:
> Is python similar to actionscript 3.0
For some very rough sense of "similar" it might be, but not really.
> Which is better to create a rich gui internet application?
> Is it AS 3.0 with flex or python with its GUI libs?
Python doesn't run in your typical we
On Aug 15, 8:02 pm, Mike Paul wrote:
> I'm trying to scrap a dynamic page with lot of javascript in it.
> Inorder to get all the data from the page i need to access the
> javascript. But i've no idea how to do it.
I'm not sure exactly what you are trying to do, but scraping websites
that use a l
On Aug 15, 10:19 pm, Steven D'Aprano wrote:
> On Sat, 15 Aug 2009 13:01:43 -0700, Douglas Alan wrote:
> > P.S. I find it strange, however, that anyone who is not okay with
> > "abusing" operator overloading in this manner, wouldn't also take
> > umbra
On Aug 16, 1:05 am, Steven D'Aprano wrote:
> On Sat, 15 Aug 2009 20:00:23 -0700, Douglas Alan wrote:
> > So, as far as I can tell, Python has no real authority to throw stones
> > at C++ on this little tiny particular issue.
> I think you're being a tad over-defensiv
On Aug 16, 4:22 am, Steven D'Aprano wrote:
> I don't like normal assignment. After nearly four decades of mathematics
> and programming, I'm used to it, but I don't think it is especially good.
> It confuses beginners to programming: they get one set of behaviour
> drilled into them in maths clas
On Aug 16, 4:48 am, Erik Max Francis wrote:
> Douglas Alan wrote:
> > Personally, my favorite is Lisp, which looks like
>
> > (set! y (+ y 1))
>
> For varying values of "Lisp." `set!` is Scheme.
Yes, I'm well aware!
There are probably as many
On Aug 16, 8:45 am, MRAB wrote:
> No, APL is strictly right-to-left.
>
> -> x
>
> means "goto x".
>
> Writing to the console is:
>
> [] <- myVar
>
> Reading from the console is:
>
> myVar <- []
Ah, thanks for the correction. It's been 5,000 years since I used APL!
|>ouglas
--
ht
On Aug 16, 6:18 am, Steven D'Aprano wrote:
> On Sun, 16 Aug 2009 01:41:41 -0700, Douglas Alan wrote:
> > I would definitely not like a language that obscures assignment by
> > moving it over to the right side of lines.
> One could argue that left-assigned-from-right
a comma\,."
However, because the comma won't appear at all in the URL-encoded
version, it has the virtue of still allowing you to split on commas.
You must of course also URL encode the '%' as %25, e.g.,
"Here is a comma (%2C) and this (%2C) is a percent sign."
Alan
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; as the commit name)
Take a look at the Talking to the User topic in my tutorial which has
a section on reading command line arguments.
Interestingly, most of the queries I get on that section are from GUI
users
who don't understand the concept of command line arguments! :-)
--
Alan G
here.
HTH,
--
Alan Gauld
Author of the Learn to Program web site
http://www.alan-g.me.uk/
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and they know a huge
amount about Python web applications. Nothing seems to be too much
trouble for them. They also provide a 60-day money-back guarantee, so
you can try-before-you-buy.
Best wishes,
Alan Harris-Reid
--
On 19:59, PATRICIA MEDINA wrote:
I know there is a converter for python 2.x to executable file, but is
there one for python 3.x yet?
I use cx_Freeze without any problems (//cx-freeze.sourceforge.net/)
HTH
Alan
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According to //sourceforge.net/projects/py2exe/files/, the latest
version only goes as far as Python2.5 :-(
Alan
On 21/03/2011 19:47, Santoso Wijaya wrote:
There's also py2exe: http://www..py2exe.org/
On Thu, 25 Aug 2005, Mike Schilling wrote:
[Off Topic discussion of netiquette, seen on comp.lang.perl.misc:]
> Gosh, if you say they should be, there's no point trying to have an
> intelligent discussion, is there?
Discussion about netiquette on any of these cross-posted groups cannot
by defi
[Rahul].
> I want to compute dot product of two vectors stored as lists a and b.a
> and b are of the same length
from scipy import dot
ans=dot(a,b)
This times faster than the alternatives I have seen mentioned so far,
given scipy.
Cheers,
Alan Isaac
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"Alan G Isaac" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> This times faster than the alternatives I have seen mentioned so far,
> given scipy.
Actually, since I am new to 'timeit', I probably should check that
I am not overlooking something. Es
n.
Thanks,
Alan Isaac
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issue is valid, of course. But then,
it has been one of the standard justifications for lambda.
Thanks,
Alan Isaac
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Hello List Members,
I am beginning to learn Python, and I've adapted some code from Google
into the function below. I'm also looking at the PEP 8 style guide. I'd
appreciate a brief code review so I can start this journey off on a solid
foundation. :)
* I've already changed my editor f
Hello List Members,
I am beginning to learn Python, and I've adapted some code from Google
into the function below. I'm also looking at the PEP 8 style guide. I'd
appreciate a brief code review so I can start this journey off on a solid
foundation. :)
* I've already changed my editor f
n Fortran, the interactive
nature can make statistical analysis quicker.
All the best!
Alan.
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(self,**kwargs):
#set lots of default values
...
#set the deviations from defaults
self.__dict__.update(kwargs)
Is this a reasonable approach overall?
(Including the last line.)
Thanks,
Alan Isaac
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On Sun, 12 Nov 2006 02:14:32 -0500, Doug <[EMAIL PROTECTED]> wrote:
> I was going to link to
> a definition of FUD to show I really meant to use that term.
Oooh.
If you had just mentioned your dyslogia,
it would have saved us all some time.
Thanks!
Alan
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If the order doesn't matter, you can sort the data and remove x * 0.5 *
n where x is the proportion of numbers you want. If you have too many
similar values though, this falls down. I suggest you check out
quantiles in a good statistics book.
Alan.
Peter Otten wrote:
> erikcw wrote:
These are two I can think of but there must be more. Any suggestions?
I think that this is great work guys - I'll see if I can take some time
to submit some of the code I developed a few years ago.
All the best!
Alan
Łukasz Langa wrote:
> Fredrik Lundh:
> > Tennessee Lee
also because I feel it unsafe.
Can anyone recommend an interpreter that does not access the internet
when it starts (or when it is running, unless I specifically write a
program that causes it to do so, so as a browser)?
James Alan Farrell
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On Tue, 26 Jun 2007 03:50:11 -, John Roth <[EMAIL PROTECTED]>
wrote:
>On Jun 25, 7:07 pm, James Alan Farrell <[EMAIL PROTECTED]> wrote:
>> Hello,
>> I recently installed new anti-virus software and was surprised the
>> next time I brought up IDLE, that it wa
On Mon, 25 Jun 2007 20:41:59 -0500, Robert Kern
<[EMAIL PROTECTED]> wrote:
>James Alan Farrell wrote:
>> Hello,
>> I recently installed new anti-virus software and was surprised the
>> next time I brought up IDLE, that it was accessing the internet.
>>
&g
produces ints.
Cheers,
Alan Isaac
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>>> None >= 0
False
>>> None <= 0
True
Explanation appreciated.
Thanks,
Alan Isaac
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his
suggests that an explicit warning is warranted.
Cheers,
Alan Isaac
PS I know ordered dicts are under discussion;
what about ordered sets?
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uot;""
Even this does not tell me that if I use a specified implementation
that my results can vary from run to run. That is, it still does
not communicate that rerunning an *unchanged* program with an
*unchanged* implementation can produce a change in results.
Alan Isaac
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ference is fine & helpful,
as long as its not an entire course on BNF.)
Thanks,
Alan Isaac
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Steven Bethard wrote:
> As far as I
> know, there's no official term for the first four elements of a class
> statement. I'd probably call it the class statement header.
That will have to do for now.
Thanks!
Alan Isaac
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id not occur to me that there
might be an interesting distinction among these
cases for the question of how to get sequential
pairs from a list. How would one draw these
distinctions in this case?
Thanks,
Alan Isaac
PS Just for context, the sequential pairs were
needed in a simulation, but
SMALLp wrote:
> Hy. How to use printer in python.
http://tgolden.sc.sabren.com/python/win32_how_do_i/print.html
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http://www.scipy.org/Cookbook/InputOutput>
hth,
Alan Isaac
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Is the behavior below expected? Documented?
(The error msg is misleading.)
Thanks,
Alan Isaac
>>> x = range(20)
>>> s = slice(None,None,2)
>>> x[s]
Traceback (most recent call last):
File "", line 1, in
TypeError: sequence index must be integer, not
On 1/16/2009 1:15 PM Paul Rubin apparently wrote:
range is an iterator now. Try itertools.islice.
Well yes, it behaves like xrange did.
But (also like xrange) it supports indexing. (!)
So why not slicing?
I expected this (to keep it functionally
more similar to the old range).
Alan Isaac
It is documented:
http://docs.python.org/3.0/library/stdtypes.html#sequence-types-str-bytes-bytearray-list-tuple-range
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pes support the following methods: index() and count()."
Alan Isaac
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Alan G Isaac wrote:
http://docs.python.org/3.0/library/stdtypes.html#sequence-types-str-bytes-bytearray-list-tuple-range
I see no mention of the tuple methods?
Right after the paragraph
"Most sequence types support the following operations."
it seems appropriate to have one sta
On 1/16/2009 6:44 PM Terry Reedy apparently wrote:
http://bugs.python.org/issue4966
Is this another lacuna or am I overlooking it?
I cannot find the 3.0 documentation of string
formatting with the ``%`` operator.
Thanks,
Alan Isaac
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ec`` cannot handle a TextIOWrapper?
Bottom line: has ``execfile(filename)`` really become
``exec(open(filename).read())``? Is this a good thing?
Thanks,
Alan Isaac
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Alan G Isaac wrote:
Is it intentional that ``exec`` cannot handle a TextIOWrapper?
Bottom line: has ``execfile(filename)`` really become
``exec(open(filename).read())``? Is this a good thing?
On 1/17/2009 4:20 PM Terry Reedy apparently wrote:
Yes. Yes.
OK. Why?
Alan Isaac
--
http
Alan G Isaac wrote:
Is it intentional that ``exec`` cannot handle a TextIOWrapper?
Bottom line: has ``execfile(filename)`` really become
``exec(open(filename).read())``? Is this a good thing?
On 1/17/2009 4:20 PM Terry Reedy apparently wrote:
Yes. Yes.
Alan G Isaac wrote:
OK. Why
}}{0}'.format('wtf?').format('wtf?')
to
'%%s%s' % 'wtf?' % 'wtf?'
According to PEP 4,
"obsolete" means "deprecated".
So the compact, simple, and useful
old string formatting is really deprecated?
Ouch.
Thanks,
Alan Isaac
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On Mon, 19 Jan 2009 14:44:01 +, Alan G Isaac wrote:
we are supposed to prefer '{0:>10}'.format('wtf?')
to
'%10s' % 'wtf?'
and
'{{0}}{0}'.format('wtf?').format('wtf?') to
'%%s%s' % 'wtf?' % 'w
strings. In
3.0, only the str type (text strings with Unicode support) supports
this method; the bytes type does not. The plan is to eventually make
this the only API for string formatting, and to start deprecating the
% operator in Python 3.1.
Thanks!
Alan Isaac
--
http://mail.python.org/mailman
On 1/19/2009 5:03 PM Terry Reedy apparently wrote:
I have not seen 3.0 emit a % deprecation warning.
Point taken.
But the vocabulary of PEP 4 suggests that
"obsolete" and "deprecated" are synonyms,
and PEP 4 lists obsolete modules without
deprecation warnings.
On 1/18/2009 9:36 AM Alan G Isaac apparently wrote:
I do not much care about the disappearance of ``execfile``.
I was asking, why is it a **good thing** that
``exec`` does not accept a TextIOWrapper?
Or is it just not implemented yet?
What is the gain from this particular backwards
On 1/20/2009 3:53 PM Rob Williscroft apparently wrote:
http://bugs.python.org/issue1762972 (*)
Useful. Thanks.
Alan Isaac
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On 1/16/2009 3:13 PM Alan G Isaac apparently wrote:
> It is documented:
>
http://docs.python.org/3.0/library/stdtypes.html#sequence-types-str-bytes-bytearray-list-tuple-range
But then again, the opposite is also documented,
since `range` is a sequence type. Quoting:
Sequence
You could try SimpleTable:
http://code.google.com/p/econpy/source/browse/trunk/utilities/text.py
fwiw,
Alan Isaac
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kes them "internal"?
http://docs.python.org/3.0/library/stdtypes.html#internal-objects
Thanks,
Alan Isaac
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On Thu, Jan 29, 2009 at 10:01 AM, Alan G Isaac wrote:
1. I seem not to understand something obvious at
http://docs.python.org/3.0/reference/expressions.html#slicings
(I assume I'm just not reading this right.)
What is an example of a slicing using a "slice_list"?
On 1/29/200
On Thu, Jan 29, 2009 at 10:01 AM, Alan G Isaac wrote:
2. It seems that slice objects and range objects are
awfully similar in many ways. Is this "appearance only",
or was there any discussion of unifying them?
Curious for insight...
On 1/29/2009 1:37 PM Chris Rebert appare
ng that a legitimate slice object
was being created.
Thanks!
Alan
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