lace you put the subscription method, clearly. I really
don't see the problem. I can see that it has not been done because
Guido and others felt that it wasn't worth doing, but not that it is
hard to do.
Regards,
Nick Maclaren.
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of entities where
there is no definable concept of equivalence between entities, and
Python has no such entities as far as I know.
Guido's response is fine - we didn't because we didn't think that it
was worth doing. One can dissent, but it makes perfect sense.
Regards,
Nick Maclaren.
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ll.
[ Incidentally, my use was in argument decoding, where the Python layer
holds the arguments as strings, and I need to pass them as an index to C
(so they DO form a respectable tuple even in Guido's sense, being fixed
in number and value and just happening to be homogeneous). ]
Regards,
Nick Maclaren.
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with that. I consider the difficulty of adding a reliable
immutable attribute in most languages to be a serious piece of
misdesign, but there isn't a huge amount of point unless it is done
properly. Unreliable safety devices are as likely to increase
errors as reduce them, at least in the han
ple. If a heterogeneous list
just happens to have objects that are all similar, does it remain
heterogeneous?
Loose guidelines are very useful, but should almost always come with
the rider "Follow these unless you have good reasons to ignore them,
but do make sure that you understand the rules fir
cantly. Python has chosen
not to do that.
Regards,
Nick Maclaren.
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f course then we would have
|> to define necessary...
It's not necessary :-) Lists, in Python, are no more homogeneous than
tuples in any sense that I have located. As I posted earlier, if
anyone knows of one, please tell me.
Regards,
Nick Maclaren.
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in Python terms, because
|> Python doesn't formally embody the concept. But that
|> doesn't mean the concept isn't real.
Of course the concept is real, but the point is that Python doesn't
embody the concept of homogeneity in lists, formally or informally,
as far as I kno
n analogy between.
Unfortunately, you are confusing the issue, because there are far
more extraneous aspects than relevant ones, and your view of the
similarities requires looking at the issue in a very strange way.
I think that I can see what you mean, but only just.
Regards,
Nick Maclaren.
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In article <[EMAIL PROTECTED]>,
greg <[EMAIL PROTECTED]> writes:
|> Nick Maclaren wrote:
|>
|> > Unfortunately, you are confusing the issue, because there are far
|> > more extraneous aspects than relevant ones, and your view of the
|> > similarities req
type the "lists are intended to
be homogenous" people use to implement mutable heterogenous sequences,
or whether they claim that wanting such a feature is heresy :-)
Regards,
Nick Maclaren.
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you. Just as you can use a string as a list. We
|> don't have to be rigid to appreciate the difference. :)
Nope. That is DEFINITELY wrong. If you write code that abuses a
language construct in a way that is discouraged but just happens to
work, a couple of decades down the line it wi
;t have all the
|> features you want.
Which is tantamount to saying that Python doesn't support mutable
heterogeneous sequences, even though they are not locked out. That
is more than just odd - it is almost unbelievable. They are a very
basic data structure, after all!
Regards,
Nick Mac
3, agent2, agent3, agent4, str4, ...]
See Algol 68 for an example of this.
Regards,
Nick Maclaren.
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ing to the mind of anyone who sees the terms, most
especially if they are familiar with their use in other areas of computing
and mathematics.
But, given that meaning, I now understand your point.
Regards,
Nick Maclaren.
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In article <[EMAIL PROTECTED]>,
"Hendrik van Rooyen" <[EMAIL PROTECTED]> writes:
|> "Nick Maclaren" <[EMAIL PROTECTED]> wrote:
|>
|> > Not at all. I didn't say that they came in pairs. Consider:
|> >
|> > [str1, str2, ag
x = (1.234567890125, 1.2345678901255)
print x
print x[0], x[1]
>>> (1.234567890124, 1.2345678901254999)
>>> 1.23456789012 1.23456789013
Is there a rational reason, or is that simply an artifact of the way
that the code has evolved? It is clearly not a bug :-)
Rega
rational and an artifact of the way the code has evolved!
Regards,
Nick Maclaren.
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In article <[EMAIL PROTECTED]>,
Bjoern Schliessmann <[EMAIL PROTECTED]> writes:
|> Nick Maclaren wrote:
|>
|> > Ah! That explains it. I would call that reason intermediate
|> > between rational and an artifact of the way the code has evolved!
|>
|> Whi
In article <[EMAIL PROTECTED]>, Fredrik Lundh <[EMAIL PROTECTED]> writes:
|> Nick Maclaren wrote:
|>
|> > The use of different precisions for the two cases is not, however,
|> > and it is that I was and am referring to.
|>
|> that's by design, of course
olved in a religious
war over - I was merely puzzled as to the odd behaviour, because I have
to teach it, and it is the sort of thing that can confuse naive users.
Regards,
Nick Maclaren.
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ay".
Not at all. "Precision" has been used to indicate the number of digits
after the decimal point for at least 60 years, probably 100; in 40 years
of IT and using dozens of programming languages, I have never seen
"display" used for that purpose.
Regards,
Nick Maclaren.
--
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uot;, "de f,", "gh), i")
|>
|> would be extremely confusing if the current behaviour was changed. See
|> http://www.python.org/sf/1534769
|> for details.
Well, I wasn't complaining - merely querying.
If this approach is taken, it would be better to document
atter entirely, and will merely
confuse you. I have a course on computer arithmetic, and am just
now writing one on Python numerics, and confused people may contact
me - though I don't guarantee to help.
Regards,
Nick Maclaren.
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2.0) are necessarily within the range
(x,y) in decimal, even for the most respectable values of x and y.
This was a MAJOR "gotcha" in the days before binary became standard,
and will clearly return with decimal.
Regards,
Nick Maclaren.
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tr(some_float) and repr(some_float) and why str(some_tuple) uses the repr()
of
|> its elements.
Precisely. And it also applies to strings, which I had failed to
notice:
>>> print ("1","2")
('1', '2')
>>> print "1", "2"
1 2
Regards,
Nick Maclaren.
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[EMAIL PROTECTED] wrote:
> I have been reading many of the posting on the GIL and impact on
> threading etc.
> I have found is confusing and would welcome some clarity on this.
>
> I understand that embedding the interpreter in a C/C++ application
> limits it to one CPU.
> If the application is mul
mrstephengross wrote:
> I would like to distribute a python program, but only in .pyc form (so
> that people cannot simply look at my code). Is there a way to do this?
> I've read up a little on the logic by which python creates .pyc's, and
> it sounds like python requires the main executed program
Have you considered running the exe as a scheduled job? Or you could
turn it into an NT service. I run quite a few py2exe exes as scheduled
jobs set up as run once on system start up.
hth
Nick.
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will help you figure out how Python programmers solve
typical (and sometimes not-so-typical) real-world problems.
Nick
--
# sigmask (lambda deprecation version) 20041028 || feed this to a python
print ''.join([chr(ord(x)-1) for x in 'Ojdl!Wbshjti!=ojdlAwbshjti/psh?'])
--
ou never, ever, accidentally mix spaces and
tabs...
Nick
--
# sigmask (lambda deprecation version) 20041028 || feed this to a python
print ''.join([chr(ord(x)-1) for x in 'Ojdl!Wbshjti!=ojdlAwbshjti/psh?'])
--
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bruno modulix <[EMAIL PROTECTED]> writes:
> Err... Looks like I've seen this before, but where ???
Don't know, but it looks sort of familiar...
Nick
--
# sigmask (lambda deprecation version) 20041028 || feed this to a python
print ''.join([chr(ord(x)-1) for x i
ork but as soon as you use the set
property it fails and even 'get' won't work after that. It surely is
deceiving, I wish it would just give an error or something. See
below.
-Nick Vatamaniuc
>>> class O:
: def __init__(self):
: self._x=15
.Like i want the
> key 170 to take either the name 'dataPackageID' or the name
> 'LocalId'.I use this in my code,and hence if either comes it should
> work .
> Can someone help me.
> Thanks
id_lookup[170]=('dataPackageID', 'LocallId')
-Nick V.
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rest of the lines will have to be shifted to
accommodate, the potentially larger new line.
-Nick Vatamaniuc
On May 7, 3:51 pm, rohit <[EMAIL PROTECTED]> wrote:
> hi,
> i am developing a desktop search.For the index of the files i have
> developed an algorithm with which
> i shou
gt;> from threading import Timer
>>> timer=Timer(5.0,baz)
>>> timer.start()
>>> Baz!
>>>
Cheers,
-Nick Vatamaniuc
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On May 7, 10:42 pm, Nick Vatamaniuc <[EMAIL PROTECTED]> wrote:
> On May 7, 10:07 pm, johnny <[EMAIL PROTECTED]> wrote:
>
> > Is there a way to call a function on a specified interval(seconds,
> > milliseconds) every time, like polling user defined method?
>
>
way to
> write the above code?
Hrvoje,
To make it more elegant I would do this:
1. Put all the ...do somethings... in functions like
re1_do_something(), re2_do_something(),...
2. Create a list of pairs of (re,func) in other words:
dispatch=[ (re1, re1_do_something), (re2, re2_do_something), .
try:
[var for var in dir() if not (var.startswith('_') or var=='var')]
Example:
---
>>> a=10
>>> b=20
>>> [var for var in dir() if not (var.startswith('_') or var=='var')]
['a', 'b']
>>>
---
Hope that helps,
Nick Vatamaniuc
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ields. The result was that my disk I/
O was saturated (i.e. the application was running as fast as the hard
drive would let it), so it was good enough for me.
Hope this helps,
-Nick Vatamaniuc
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On May 9, 4:01 pm, [EMAIL PROTECTED] wrote:
> Thanks for the info Nick. I plan on accessing the data in pretty much
> random order, and once the database is built, it will be read only.
> At this point Im not too concerned about access times, just getting
> something to work. I
It seems I can get some of these fairly easy with the inspect module, but
> others I need to test in multiple ways.
>
> Any ideas?
>
> Cheers,
> Ron
Ron,
Consider using epydoc if you can. Epydoc will sort the methods and it
will also let you use custom CSS style sheets for the final HT
On May 10, 1:28 am, Ron Adam <[EMAIL PROTECTED]> wrote:
> Nick Vatamaniuc wrote:
> > Ron,
>
> > Consider using epydoc if you can. Epydoc will sort the methods and it
> > will also let you use custom CSS style sheets for the final HTML
> > output. Check out the
riority value between 0.0 (the lowest) and up.
Then look at the run trace and notice that on average the 0.75
priority thread is called more often than the 1.0 priority.
Hope this helped,
-Nick Vatamaniuc
>>> from threading import Thread
>>> from time import sleep
rsMesh(BaseMesh):
def __init__(self,...):
BaseMesh.__init__(self,...)
etc. initializer...
def refine(self,...):
...user's refine method would go here...
--
So for each different refine() method the user can
modified in place, create another
wrapper function that calls your qsort and then will copy all data
from the result into the original list and you are done. Something
like:
def qsort_in_place(L):
sortedL=qsort(L)
for (i,x) in enumerate(sortedL):
L[i]=x
Cheers,
-Nick Vatamaniuc
--
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selected
: employee">'''
>>> s
'\'D132258\\\',\\\'\\\',\n\\
\'status=no,location=no,width=630,height=550,left=200,top=100\\
\')"\ntarget="_blank" class="dvLink" title="Send an Email to selected
\nemp
ST 2007; root:xnu-792.18.15~1/RELEASE_I386 i386 i386
If you unpickle though will the results be the same? I suspect they
will be. That should matter most of all (unless you plan to compare
objects' identity based on their pickled version.)
Remember, that by default pickle and cPickle will cr
On May 16, 1:13 pm, Victor Kryukov <[EMAIL PROTECTED]> wrote:
> Hello list,
>
> I've found the following strange behavior of cPickle. Do you think
> it's a bug, or is it by design?
>
> Best regards,
> Victor.
>
> from pickle import dumps
> from cPickle import dumps as cdumps
>
> print dumps('100179
ll allow you to use a third party radius server if you want and
since all the two-factor vendors support radius, you won't have to re-
write the apps if you switch strong authentication vendors.
HTH,
nick
--
Nick Owen
WiKID Systems, Inc.
404.962.8983
http://www.wikidsystems.com
Commercial
hat is going on.
Any pointers appreciated, to more-or-less anything.
Regards,
Nick Maclaren.
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many uses of Perl
|> What exactly did you "hear" of several "uses"? Which
|> application? Academia, Business, ...?
Mainly academic research, but that still covers many fields.
However, I am not and never have been a 'pure' academic, and
am as interested in oth
m on the wrong list, please let me know!
Thanks,
Nick Alexander
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gt;NickAlexander
>
> I think that the right way is to add the methods to the tp_methods
> slot and use METH_COEXIST in the PyMethodDef flags field. Example:
Ziga, thanks for an extremely helpful reply. I'll experiment and post
again if there are issues.
Cheers!
Nick
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utput. This way
you don't have to install yapgvb or other adapters and it will work
with Python 2.5. But you will need to compose your dot file as a giant
character buffer...
-Nick V.
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On Mar 7, 3:49 pm, "John" <[EMAIL PROTECTED]> wrote:
> Then is there anyway to sort the numeric keys and avoid future implemetation
> confusion?
>
> "Ant" <[EMAIL PROTECTED]> wrote in message
>
> news:[EMAIL PROTECTED]
>
> > On Mar 7, 8:18 pm, "John" <[EMAIL PROTECTED]> wrote:
> > ...
> >> However,
gt;>> #note > means big endian
>>> packed
'\xca\xfe'
>>> #oh, wow it spells cafe! ;-)
>>> #now unpack
>>> unpacked=unpack('>H',packed)
>>> unpacked
(51966,)
>>> odata=unpacked[0]
>>> vars=[]
>>> for
On Mar 11, 3:36 pm, Gordon Airporte <[EMAIL PROTECTED]> wrote:
> I'm trying to find a way to take a file that another program has opened
> and writes to periodically, open it simultaneously in Python, and
> automatically update some of my objects in Python when the file is
> written to.
> I can ope
Hi,
Quick question. I am running python on windows xp. i want to import my own module "mymod". However, when I try to import it i get the error message "ImportError: no module named mymod".
"mymod" is located in a directory that is part of the computer's "path" env variable. Imports fine if 'my
erver at a time so you still 'play nice' with
each of the servers. If you want to have a max # of server threads
running (in case you have way to many servers to deal with) then run
batches of server threads.
Hope this helps,
Nick Vatamaniuc
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reak
b = c
else :
if c == a :
break
a = c
That works in binary, but in no base above 2 (assuming that I haven't
made a stupid error writing it down). In THAT case, it is easy to fix
for decimal, but there are ways that it can show up that can be quite
tricky to fix.
Regards,
Nick Maclaren.
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ded programs. Yes, I know
that it is a bit Irish for the best way to use a shared memory system
to be to not share memory, but that's how it is.
Regards,
Nick Maclaren.
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ith difficulty). Debugging
and tuning OpenMP and POSIX threads are beyond anyone except the most
extreme experts; I am only on the borderline of being able to.
The ASCI bunch favour Co-array Fortran, and its model matches Python
like a steam turbine is a match for a heart transplant.
[*] They are worth looking up, if you don't know about them.
Regards,
Nick Maclaren.
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e.
They use it for the communication, but don't expose it to the
programmer. It is therefore easy to put the processes on different
CPUs, and get the memory consistency right.
Regards,
Nick Maclaren.
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ONCEPTS in common between
POSIX and C's memory consistency 'specifications' is perhaps the worst.
That is why many POSIX threads programs work until the genuinely
shared memory accesses become frequent enough that you get some to the
same location in a single machine cycle.
Regards,
Nick Maclaren.
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HPC system in UK academia for a decade,
ending less than a year ago, incidentally, and was and am fairly well
in touch with what is going on in HPC world-wide.
Regards,
Nick Maclaren.
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for a couple of decades. Indeed, a lot of
modern programmers regard having to distort simple expressions in that
way as anathema.
It isn't a major issue, because our experience from then is that it is
both teachable and practical, but it IS a way in which any base above
2 is significantly worse than base 2.
Regards,
Nick Maclaren.
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and others forcing "consistency" (which is
not actually defined, and there are many possible, incompatible,
interpretations). It leaves all language aspects (including allowed
code movement) to C.
There are no concepts in common between C's and POSIX's consistency
specifica
n primitives, and
threading models like OpenMP and BSP have explicit control.
Also, MPI has asynchronous (non-blocking) communication.
Regards,
Nick Maclaren.
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reasons why what seems to be a more heavyweight mechanism (message
passing) can be faster than an apparently lightweight one (data sharing)
are both subtle and complicated.
Regards,
Nick Maclaren.
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- like rational,
it would be straightforward to add to Python as an extension type.
Regards,
Nick Maclaren.
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e the last
bit to 1. An old, cheap approximation to rounding.
Regards,
Nick Maclaren.
--
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st enough for real work by someone who
is not deeply into developing Grid software, I will be amazed.
Regards,
Nick Maclaren.
--
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have a code generation application to take care of
all the getters and setters.
But of course if you have non-technical people who just know how to
read UML diagrams, it makes sense to invest in a good design tool.
Hope this helps,
-Nick
Carl J. Van Arsdall wrote:
> For those of you that work
In article <[EMAIL PROTECTED]>,
Carsten Haese <[EMAIL PROTECTED]> writes:
|> On Thu, 2007-01-11 at 23:47 +, Nick Maclaren wrote:
|> > In article <[EMAIL PROTECTED]>,
|> > Facundo Batista <[EMAIL PROTECTED]> writes:
|> > |> Noud Aldenhoven wrote
her one can replace the other,
So far, so good. With reservations, I agree.
|> but there are more use
|> cases for Decimal than for Rational.
That is dubious, but let's not start that one again.
Regards,
Nick Maclaren.
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anipulated appropriately.
Yes, I know that's "cheating" :-)
Regards,
Nick Maclaren.
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ATING-point
helps with providing that, but that claim is extremely dubious.
I can explain the problem in as much detail as you want, but would
very much rather not.
Regards,
Nick Maclaren.
--
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ow!".
Oh, because it's not a proper data type! The data type is an expression,
and is held in a structured form, of which such powers may be one level.
This is better regarded as an optimisation of a common case than a true
data type. Now, there MAY be such a language that supports such
it was used on the old, discrete-logic, machines.
I have been told by hardware people that implementing IEEE 754 rounding
and denormalised numbers needs a horrific amount of logic - which is
why only IBM do it all in hardware. And the decimal formats are
significantly more complicated.
What
t, but that claim is extremely dubious.
|> > I can explain the problem in as much detail as you want, but would
|> > very much rather not.
|>
|> Sorry, Nick, you might have to. ;-)
|>
|> I'm not educated in these matters, so I'd genuinely like to know why
|>
t of the base.
So, at a wild guesstimate, 64-bit decimal will deliver a precision
comparable to about 56-bit binary, and will cause significant numerical
problems to a FEW applications. Hence people will have to convert to
the much more expensive 128-bit decimal format for such work.
Bloatware rules. All your bits are belong to us.
Regards,
Nick Maclaren.
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tware and throw a switch
selecting between the two rounding rules.
Regards,
Nick Maclaren.
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cent encapsulation.
The decimal floating-point brigade grossly exaggerate the difficulty of
doing that, in order to persuade people that their solution is better.
If they admitted the difficulties of using decimal floating-point, and
merely said "but, overall, we think it is a better solution
an exception if a 1 ULP change in the floating-
point number would give a different answer; this is needed to make
certain operations reliable.
The default formatting does the obvious thing :-)
Er, that's about it
Regards,
Nick Maclaren.
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applications. In 30 years, it
has got almost nowhere.
Don't confuse interval methods with interval arithmetic, because you
don't need the latter for the former, despite the claims that you do.
|> For people just getting into it, it can be shocking to realize just how
|> wide the
t; past an experiment.
As the same is true for what plenty of people have done, despite them
having good backgrounds in mathematics, don't feel inferior!
Regards,
Nick Maclaren.
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oth the problem and global
optimisation.
This is why the "statistical" methods (so disliked by Kahan) are used.
In a fair number of cases, they give reasonable estimates of the error.
In others, they give a false sense of security :-(
Regards,
Nick Maclaren.
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Hmm. The extensions documentation describes how to add instance
members to a class (PyMemberDef), but I want to add a class member.
Yes, this is constant for all instances of the class.
Any pointers?
Regards,
Nick Maclaren.
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ance...
Oh, one of the first two - I am not bonkers! Changing a class after
instance creation is guaranteed to cause confusion, if nothing else.
Regards,
Nick Maclaren.
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very easily provide
the latter.
Is there any documentation on the coercion function (nb_coerce)? It
seems to have unusual properties.
Thanks for any hints.
Regards,
Nick Maclaren.
--
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nging instances. From a practical point of view I would
|> say: "Just redefine it". But that is not very helpful. Specially if you are
|> mucking about in C, as your title suggests...
Thanks. As someone else posted, the answer is PyDict_SetItemString
immediately after PyType_Ready.
Regards,
Nick Maclaren.
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't be 100% reliable on all
systems.
Sorry. But that is the situation :-(
Regards,
Nick Maclaren.
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nyone who used
MVS (which are NOT the ones claimed by the Unix brigade, which are mostly
bogus) :-)
Under Linux, you can do something with fuser, and I am pretty certain that
modern Macintoshes (i.e. BSD) will have an equivalent. It can't be made
reliable (unlike under MVS), but might reduce the number of problems.
Regards,
Nick Maclaren.
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_CREAT). I can't
remember which - perhaps AIX or OSF/1 (not DEC).
But I was referring to a different problem. Some remote and parallel
filing systems handle such things very badly, and it is often possible
to create a file even if it exists and O_CREAT|O_EXCL is set. A similar
remark appl
d find something, because the vulnerability
|> is so well known for ages.
Not really. There are LOTS of vulnerabilities that have been known
for ages and are still legion. The reason that this is unlikely is
that it is both easy to spot and trivial to fix.
Regards,
Nick Maclaren.
--
http://mail.python.org/mailman/listinfo/python-list
lready deprecated.
And top posting is only more convenient if you are merely adding a
"me, too" or equivalent, and not responding in detail.
But you have been told both of those before.
Regards,
Nick Maclaren.
--
http://mail.python.org/mailman/listinfo/python-list
the bottom. Rather
like an appendix. But top-posting when you are responding to Email
is as discourteous as top-posting when you are responding to newsgroups.
|> So I concede the point, and I'm bottom-posting like a good citizen. =20
Excellent!
Regards,
Nick Maclaren.
--
http://mail.python.org/mailman/listinfo/python-list
|> safe or unsafe?
Unsafe. They are built on top of unsafe primitives (POSIX, Microsoft
etc.) Python will shield you from some problems, but not all.
There is precious little that you can do, because the root cause is
that the standards and specifications are hopelessly flawed.
Regards,
Nick Mac
are flawed, not that the threads underneath you
|> are buggy.
I suggest that you find out rather more about the ill-definition of
POSIX threading memory model, to name one of the better documented
aspects. A Web search should provide you with more information on
the ghastly mess t
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