one and a
> generator.
>
> (Or is this behavior different in Python 2.5? I hope not...)
No misunderstanding on your part, just my error on untested code -- no
changes in Python 2.5 so that yield of a generator means yielding each
of its items, my bad, sorry.
Alex
--
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trade-off, and yet most design IS about making trade-offs...
> > There's no need to define this 'meta' attribute anywhere, it just
> > springs into existence when you assign to it.
>
> ?
>
> "assign to it" with:
>
> setattr(Talker, 'meta', "Class meta information")
>
> but _not_ with this:
>
> Talker.meta = "Class meta information"
>
> correct?
Nope: both forms have IDENTICAL semantics. They both work in just the
SAME way.
Try it out...!
>>> class Talker(object): pass
...
>>> Talker.meta = 'class metainfo'
>>> print Talker.meta
class metainfo
>>>
Alex
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Duncan Booth <[EMAIL PROTECTED]> wrote:
> Alex Martelli wrote:
>
> > It IS true that in Python you cannot set arbitrary attributes on
> > arbitrary objects. The workaround is to use a dict, indexed by the id
> > of the object you want to "set arbitrary attri
learned that I need to write *UNIT-TESTS* for all of my code -- me and
another million programmers. Of course, unit tests, which are
indispensable anyway to catch the += vs -= typoes, as a side effect also
catch any typos such as zippo vs zappo. Very good expansions on these
fundamental ideas can be seen at
<http://www.mindview.net/WebLog/log-0025> and
<http://www.artima.com/weblogs/viewpost.jsp?thread=4639>, by excellent
authors Bruce Eckel and Robert Martin respectively (great experts of
such languages as Java and C++, but aficionados of Python, Ruby,
Smalltalk thanks to these considerations).
Alex
--
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7;' as empty, using the
no-op statement ``pass''). Still, some people believe there is mystical
and magical power in having special syntax for something rather than
using perfectly normal, general, and existing syntax for the purpose;
such syntax-obsessed people will no doubt be more i
Brian van den Broek <[EMAIL PROTECTED]> wrote:
> (I do realize that US data isn't most pertinent to Steven, Alex or
> myself -- au, it, ca -- but it is ready to hand. Shamefully, my
Actually, I've been living in the US for over 9 months now, and like all
immigrants I h
ver Python functions though, these may have to be
> extended to "full" closures if they aren't) and be considered by some as
Python's closures are 'full', but don't allow inner functions to rebind
names in the namespace of outer functions.
I'm not su
KraftDiner <[EMAIL PROTECTED]> wrote:
...
> Frankly how are you ever to know if this type of error is occuring?
<http://en.wikipedia.org/wiki/Unit_testing> .
Alex
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t's unfortunate to propagate disinformation
about its assignment semantics differing from Python's -- it will
confuse people who know Java, and there are many of those.
Alex
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ys, and don't currently have gmpy at hand).
Alex
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you would by staying in the Netherlands. You'll have to invent some
better excuse, to explain why you chose not to attend it.
Alex
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want to add
a bug report if you already know about it -- 'Try Python' is a neat
hack, and useful, it well deserves some care from would-be bug
reporters... but I can't see any links to "known problems" (or other
bug-reporting facilities) from the base page.
Alex
--
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ng it a staticmethod like so:
>
> @staticmethod()
> def GenerateRandomColour():
> rn.seed()
> colour = rn.choice(['C', 'P', 'Z'])
> return colour
No parentheses on the decorator line, just '@staticmethod'. Otherwise,
fine.
Alex
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oubt this is the root
of your problem, but, at any rate, loop on a COPY of the list you're
modifying -- e.g. change the first statement to
objs = list(myListOfObjects)
Alex
--
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o
> put the cursor after all the text in a textarea, I'll fix this
> now.
I'm no Safari expert (and no great shakes at Javascript!), but, I'll ask
around and report back here, thanks.
Alex
--
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er only one case in a
real-world program of needing anything like that -- the original dict
had "sub"-dicts (mapping strings to numbers) as values, but fortunately
it was acceptable for the application to have frozen sets of (key,
value) pairs "stand for" those subsets in the "reversoid" dict (I sure
did wish at the time I had "frozen dicts", though;-).
Alex
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an
obviously account for "hundreds of euros" already); Europython is
specifically held in Europe to be cheaper and more convenient to attend
for Europeans, and I've always met many people there who fell in the
"income low to nonexistent" bracket for one reason or another.
Alex
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Mike Meyer <[EMAIL PROTECTED]> wrote:
> [EMAIL PROTECTED] (Alex Martelli) writes:
> > Mike Meyer <[EMAIL PROTECTED]> wrote:
> > For some reason, I couldn't see the links at the end of the page; now I
> > can, though they look sort of "ragged", but
ettings rather
than any programming issue. Do remember to copy and paste, NOT
summarize in your own words, otherwise you may make it unfeasible for us
to help you out!
Alex
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I am looking for a way to strip the blank line and the empty newline at
the end of the text file. I can get the blank lines removed from the
file but it always leaves the end line (which is blank) as a newline. My
code is here and it works but leaves the newline at the end of the file.
How do I g
Mike Meyer <[EMAIL PROTECTED]> wrote:
> [EMAIL PROTECTED] (Alex Martelli) writes:
> > I'm finding it hard to arrange my own experiments with Safari (I'm using
> > a loaner machine since my normal one[s] are all having problems and
> > under repair) but I'
easily been able to specify a different
filler, I _would_ have been able to use it a couple of times.
Alex
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Thank you guys for all your help. Was able to nail it down.
uh I dunno where i saw the 'wt' at. somewhere online though.
I have to do it in 2 stages though and run through a coula files but it
works.
import re
f = open("oldfile.txt")
w = open("newfile.txt", "w")
for line in f:
if line.strip():
;\n'))
and it works great!
Now I can go on to the next step. Thank you guys for your help
Alex
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d, for example, in Amsterdam, so for
a NL resident travel costs (and there never were any other) should have
been truly minute.
> google), but IMO it remains true that one needs at least one link to
> corruption to be able to post to usenet.
If you define every academic center and e
try and you
> would be wiser if you dropped this attitude.
And hired hundreds of thousands of people a year (that's about the
number of resumes we get now, WITH the current job offers) without
selection? Sure, that would definitely ensure wisdom. Yeah, right.
You're so pathetic you aren't even funny.
Alex
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Steve Holden <[EMAIL PROTECTED]> wrote:
...
> On the available evidence that seems completely untrue. Alex, as I know
> from personal experience, has no problems accepting the material rewards
> of a lifetime spent developing expertise, but that doesn't make him
> elit
Anton Vredegoor <[EMAIL PROTECTED]> wrote:
...
> > On the bureaucratic side: Alex, we *have* a procedure at this point, and
> > we have been trying to contact you several time in the past months -- with
> > no success as far as I know, so I'll try via comp.lang.pyt
ement to a team can prevent it from being a
> 'linear combination of social peer pressure vectors'. Face your fears.
Anything but linear. But that's not a FEAR of mine -- I would call it a
HOPE, were it not for the fact that I see it concretely happening every
day at work: teams that produce more value than the sum of their parts
would, with mutual respect and amity growing among people from the
wildest and most diverse mix of backgrounds and personalities.
Alex
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from struct import pack
>>> pack("B", 1)
'\x01'
>>> pack("BB", 0, 1)
'\x00\x01'
>>> pack("BI", 0, 1)
'\x00\x00\x00\x00\x01\x00\x00\x00'
>>> calcsize("BI")
8
>>> calcsize("BB")
2
Why does an unsigned char suddenly become 4 bytes long when you
include an unsigned int in the format string? It'
< Idiot.
On 11 Jan 2006, at 10:46, Alex Stapleton wrote:
> from struct import pack
>>>> pack("B", 1)
> '\x01'
>>>> pack("BB", 0, 1)
> '\x00\x01'
>>>> pack("BI", 0, 1)
> '\x00\x00\x00\x
ith experience in sensor interfaces, for example). But if you
only want wide open, uncrowded spaces, Google may not have a suitable
opening for you... yet;-).
Alex
--
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q) instead]
> >>>
>
> I've no idea why this limitation is here... perhaps it is because pre
> python2.4 calling += on strings was very slow?
No: when I implemented sum, I originally specialcased sum on strings to
map down to a ''.join -- Guido decided it was confusing and had no
advantage wrt calling ''.join directly so he made me put in that check.
Alex
--
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rk on _numbers_ -- the reason it takes that
second optional parameter is essentially to be able to specify the
``type'' of numbers. In retrospect it might have been better to have a
single argument (or interpret multiple ones like min or max do, maybe),
forcing the starting value to be integer
prises* I ever got
from Python...!-)
((I don't think this violates the "introduce no complexity that doesn't
help understanding" rule -- I think the 1==1.0 case is important!))
Alex
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The last recipe in the 2nd ed of Python Cookbook shows how to design an
automatic "metaclass conflict reconciler" to do the inheritance on your
behalf, btw.
Alex
--
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y module inspect for that) and
construct an artificial dict, then drop the 'bases' and use an empty
tuple of bases for the supercall (real inheritance doesn't let you
"hide" methods, or other superclass attributes, ever).
Etc, etc -- it's most surely possible to do what you want, whatever what
you DO want is exactly!-)
Alex
--
http://mail.python.org/mailman/listinfo/python-list
py) could inherit from it in order to assert "yes, I *AM* a
number!" and allow isinstance-based checks rather than ones based on
"try to sum 0 and see if that gives an exception". A very small,
localized, and potentially useful change, IMHO.
Alex
--
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ogramming -- if they're emacsers, bully for them, but
I'm a vi'er myself (I keep telling myself I should learn emacs, but
then, I also tell myself I should stop smoking, and I don't actually DO
anything about that, either;-), and TDD can be used with any editor or
IDE, anyway.
Alex
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n "non-ASCII text" here?
At any rate, my compliments for a new release (which looks great!) of a
most excellent module!
Alex
--
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f
'baseinteger' goes away.
The case for 'basenumber' is much stronger, and I'm making it on
python-dev (where I already made it in the past, in the last few years);
look for [basenumber site:python.org] and you'll find the few but
informative posts that went around, mostly about 3 years ago.
My main worry is that in the quest for a "perfect hierarchy" that keeps
proving too tricky, something with real-life usefulness such as
basenumber may fall by the wayside...
Alex
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Paul Rubin <http://[EMAIL PROTECTED]> wrote:
...
> while the traditional
>
> xrange(f(n)-1, -1, -1)
>
> only evaluates it once but is IMO repulsive.
Yep, reversed(range(f(n))) is MUCH better.
Alex
--
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,-1,-1).
But not easier than reversed(range(6)) [[the 5 in one of the two
expressions in your sentence has to be an offbyone;-)]]
Alex
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Charles Krug <[EMAIL PROTECTED]> wrote:
...
> I'm trying to create a list of all of C's subclasses:
There's a class method for that very purpose:
>>> class C(object): pass
...
>>> class D(C): pass
...
>>> class E(C): pass
..
g from the start to one past
> the end specifically to help prevent signpost errors, and now some folks
> want to undermine that.
>
> *shakes head in amazement*
Agreed. *IF* we truly needed an occasional "up to X *INCLUDED*"
sequence, it should be in a syntax that can&#
Roy Smith <[EMAIL PROTECTED]> wrote:
> Alex Martelli <[EMAIL PROTECTED]> wrote:
> >Agreed. *IF* we truly needed an occasional "up to X *INCLUDED*"
> >sequence, it should be in a syntax that can't FAIL to be noticed, such
> >as range(X, endinclu
print str(my_list[i])
>
> Is this possible?
Sure, see the details at <http://docs.python.org/api/newTypes.html> and
consider that what you want will need to go into a PyMappingMethods or
PySequenceMethods structure -- not well documented online, but just take
a look in the Python
- considering that I brought
with me a hundred or more DVDs from the old country, and I get as many
more here in shops or via netflix, I really couldn't do without. I
legally ordered it on the web and it was legally delivered. What's
illegal about it?!
Alex
--
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(tentatively, I hope) Pronounced
that the [...] form will stay in Py3K as syntax sugar for list(...). I
find that to be a truly hateful prospect, but that's the prospect:-(.
Alex
--
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Rocco Moretti <[EMAIL PROTECTED]> wrote:
> Alex Martelli wrote:
> > Terry Hancock <[EMAIL PROTECTED]> wrote:
> >...
> >>due to the Evil Conspiracy of region-coding, I couldn't
> >>watch the British DVD even if I were to import it (Well,
>
quot;suggest lists" is that you're used to that display form in Python, but
there's no real reason to HAVE a display form for lists at all, IMHO.
Alex
--
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igh price to get a
> region-free player in the USA, but I'm certainly not going
> to.
Me neither! I got mine for about $50 from a well-rated web merchant, as
I recall -- is that what you mean by "a very high price"?
Alex
--
http://mail.python.org/mailman/listinfo/python-list
tillborn),
others prize verbosity (or else Cobol would never have been coinceived);
but Python's "Middle Way" tends to strike a good balance. IMHO, the
balance would be better served by spelling list(1,2,3) rather than
[1,2,3] (but the BDFL disagrees, so my opinion doesn't matter m
n a chair rather than a
sofa; depending on subtle nuances of the English dialect used (varying
with time and space), this may have very different implications in
defining the character and mood of this individual...
Alex
--
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t page, how could I request all of those images and
> download them into some specified folder? I am sure this is quite easy,
> but I am stuck.
There's a good crawler in the Demo directory of the Python source
distribution, so download and unpack said sources and look there.
Alex
--
h
doing this?
Thanks,
Alex
--
ChapterZero: http://tangentspace.net/cz/
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you want. A much more reliable way to achieve that is to use
timed redirects, or an AJAX (Javascript-based) solution.
Alex
--
http://mail.python.org/mailman/listinfo/python-list
;gained" by wrapping a function into an unbound
method is an implicit typecheck on the first argument, and if, as the
class, you're using 'object' as in your example, that's not much use
[even in other cases, it's no great shakes;-)]).
Alex
--
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x27;s hope for the future. But a more complete 'partial' is likely to
be acceptable sooner than any fix to bound/unbound methods: I suspect
the only ingredient that's missing is a generous helping of irrefutable
use cases.
Alex
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it would be horribly, painfully
inconsistent if **2 was interpreted as "square each item".
Alex
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raise
Not sure the code in a socket.error has attributename 'errno', but I
hope you get the general idea.
Alex
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Christoph Zwerschke <[EMAIL PROTECTED]> wrote:
...
> given length. You could get a 6/49 lotto tip with something like:
>
> choice(set(range(49)).powerset(6))
And that would be better than the current random.sample(range(49),6) in
WHAT ways, exactly...?
Alex
--
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hon chooses to
support this syntax variation by special methods in classes, and thus
encourages people to create classes if they're keen on the syntax.
Alex
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Christoph Zwerschke <[EMAIL PROTECTED]> wrote:
> Alex Martelli schrieb:
> > Christoph Zwerschke <[EMAIL PROTECTED]> wrote:
> >...
> >> given length. You could get a 6/49 lotto tip with something like:
> >>
> >> choice(set(range(49))
_hash__). Of course, by going directly to
object.__hash__ you're explicitly *avoiding* the override, so...
Alex
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lse) only, then
test = sum(logflags) == len(logflags)
is simpler and fast than, but equivalent to, my first suggestion.
Alex
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wise, just as one example.
Alex
--
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Gerhard Fiedler <[EMAIL PROTECTED]> wrote:
> On 2006-07-13 01:50:18, Alex Martelli wrote:
>
> >> I'm not sure about which languages you are talking (pretty much all that
> >> allow public methods also allow public attributes), [...]
> >
> >
(0,10):
> for b in range(0,10):
> for c in range(0,10):
> for d in range(0,10):
> print "%s%s%s%s" %(str(a), str(b), str(c),str(d)
for n in xrange(1):
print "%4.4d" % n
Alex
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ike any other addition of, or change to, functionality, this would of
course be a proposal for 2.6, since 2.5 is feature-frozen now.
Alex
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ring it for separate
download and installation; mfc80u.dll, similarly (albeit only at
hundreds of sites;-); and so on, and so forth.
The situation is quite similar for other languages, Python included, and
other frameworks, wxWidgets (and wxPython on top it it) included.
Alex
--
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e
Python applications for .NET. See
<http://www.codeplex.com/Wiki/View.aspx?ProjectName=IronPython>: it's
now in Beta9 and the final non-beta release should be out soon.
Alex
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Paul Boddie <[EMAIL PROTECTED]> wrote:
> Alex Martelli wrote:
> > Paul Boddie <[EMAIL PROTECTED]> wrote:
> > >
> > > Well, range is a function in the current implementation, although its
> > > usage is similar to that one would get if it were a cla
danielx <[EMAIL PROTECTED]> wrote:
> > ...and source code...
>
> *shudders* What happened to all the goodness of abstraction?
<http://www.joelonsoftware.com/articles/LeakyAbstractions.htm>
Alex
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Bruno Desthuilliers <[EMAIL PROTECTED]> wrote:
...
> >>And of course import hooks.
> >
> > Python?? Where?
>
> RTFM:
> http://www.python.org/doc/2.3.5/lib/built-in-funcs.html
Perhaps a better reference is <http://www.python.org/dev/peps/pep-0302/>
e,
since somebody using Ruby instead of a P-language would be a... LAMR!!!
If I were on the board of the Ruby equivalent of the PSF, I'd be
lobbying hard for the language's name to be changed to PRuby -- with the
P being mute, as in Wodehouse's character Psmith. _That_ would remove
the acronymical barrier and ensure PRuby's triumph.
Alex
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s accept the / as path separator? That
> DOS was written on Xenix (Posix) systems (using the slash as path
> separator)? That Microsoft was for a long time pretty much a pure Xenix
> shop?
Internally yes (indeed, they developed Xenix, before later selling it to
SCO), but that does not
jean-michel bain-cornu <[EMAIL PROTECTED]> wrote:
> Andy Dingley a écrit :
> > I'd never recommend dual-boot for anything!
> Don't agree man, it's good for testing...
It's bothersome for testing: virtualization is much handier in most
cases.
Alex
--
h
by the time PCs with hard disks were starting to become
widespread, MS had lost interest in marketing Xenix, which only SCO was
pushing, so it made sense in '87 for MS to sell SCO Xenix outright in
exchange for a large slice of SCO's stock (20%, if I remember right).
Alex
--
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's huge
profits, at Microsoft's purchase of the makers of VirtualPC, at the rise
of Parallels, at open-source developments such as QEMU and Xen...
> I think the folks at microsoft are used to getting cursed at :)
Particularly by their stockholders, with the stock down from a high of
a
quot;this is a hook method which you should override in a
subclass if you want to tweak some detail of functionality", it's all
too easy to forget about the latter case (fortunately Queue.Queue is
there to remind us of it:-).
Alex
--
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W support)... so (in this setting) you _could_ do it in SW, and
save the $100+ per box that you'd have to spend at some shop such as
<http://www.pcwatchdog.com/> or the like...
Alex
--
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This might be more flexible:
pat = re.compile(r"^(a*(?=b)b*(?=[ac])c*(?=[abd])d*)+$")
tests = [('aabbbaabbcccbbbcccddd', True),
('aabcabcd', True),
('abcd', True),
('aabbccaabbccabcabababbb', True),
('aabbccaabbccabcabababbbabcd', True),
cs in the
nonblocking case(s) are somewhat weird (to my way of thinking, but then,
my Unix background _is_ somewhat dated!-), but they wouldn't help you
anyway, it seems to me -- looks like you'd like drastically different
semantics (with neither open blocking, or just the reading one), but
Unix just doesn't really offer them...
Alex
--
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ou calling *Joel* an "all-java kid"?! He's an old clunker,
just like me!, and HIS background is primarily in C and some kind of
LISP -- he makes that quite clear in some of his books.
Alex
--
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LaGuna <[EMAIL PROTECTED]> wrote:
> Se si come?
>
> Ciao by Enzo
Questo newsgroup preferisce l'inglese -- per favore, chiedi su
it.comp.lang.python invece che qui.
This newsgroup prefers English -- please ask on it.comp.lang.python
rather than here.
Alex
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logic is in fact internal to the script, pushing
the fraction of lines usefully running external processes to 20% or
less, as you add logic, error-handling, and other glue functionality to
the script. In such situations, languages such as Perl, Python or Ruby
offer far better facilities (and the fac
ference counts drops to 0 at this statement's
end. (This would NOT necessarily happen in other Python
implementations, such as Jython or IronPython, but I suspect THOSE
implementations wouldn't have os.mkfifo...).
> And the odds are fair that when you get this working, you
> will run into some other inconvenient behavior. Named pipes
> are a little tricky.
Very -- particularly their blocking behavior at open (which appears to
have perhaps tricked you in this case).
Alex
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you
can find the various PDFs at <http://www.aleax.it/python_mat_en.html> --
of course, they're somewhat fragmentary, but I hope they can be of some
help!
Alex
--
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rm that Comcast's email system is a
mess (which is why I use other ways of doing mail -- and don't even get
me started on Comcast's "news", might get my pressure up).
Alex
--
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ed behavior, at least in all Unix
> > versions and variants I'm familiar with).
>
> But it does work. I edited that excerpt only to complete
> missing parts, and ran it on MacOS X and GNU Linux.
>
> import os
> f = '/tmp/r'
> try:
> os.unlink(f)
> except:
> pass
You forgot to add os.mkfifo(f) here -- so you're writing and reading a
perfectly ordinary file... of course *that* gives no problems!-)
Alex
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r device then, as it came with teletypes typically used as
consoles), so keeping track of columns would have a royal mess:-).
I'm pretty sure you're still _able_ to take SOME Assembler-based course
in most universities, but you need to strive pretty hard for the
purpose... it's definitely not in the "default curriculum", even for
EEs, much less CSs.
Alex
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factory.
> [I don't know why I get tangled up in these named pipe problems,
> when I know better myself than to use them!]
I have no problems using named pipes _according to their documentation_
(so, in particular, no O_RDWR opening, and acceptance of their
thread-blocking behavior on O
python" in the shell?
One sufficient idea might be to put in your .bashrc file (or the like) a
statement such as
alias python=python2.3
Alex
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o use the mapping with string interpolation.
> >
> Well, this makes sens... But then why not use a plain dict to collect
> data, and wrap it in a special one just before using it for
> interpolation ? ie:
Using a single container (and being able to modify and use it fluidly)
is simply handier. That's what defaultdict in Python 2.5 is for, btw.
Alex
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... it may lead to
> very inconsistent behavior. It's like overridind both __eq__ and __ge__
> with a different behavior. It's better for you to override
> __contains__() too.
I think it's perfectly safe -- that's what defaultdict in Python 2.5
does, after all.
Alex
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print "that's all"
return
and proceeded to compile and execute as follows: [[Note: it does not
matter that I'm using 2.5, the code is just as fine with previous
versions -- it just happens that 2.5 is what I'm using right now in
order to help out with 2.5's
ke
different paths" (yeah, I _could_ study the sources, but I'm lazy:-)...
Alex
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Tim Peters <[EMAIL PROTECTED]> wrote:
[snip]
thanks for an exhaustively satisfying explanation!
Alex
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wardm <[EMAIL PROTECTED]> wrote:
> Thanks Alex for your help, (and advice on focusing the point of my
> question).
>
> I was able to compile and run your example OK, but when I try to use the
> "VarDictionary" in the
> MyScriptModule.py code, I get an exception
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