On Sun, May 12, 2013 at 1:17 AM, Steven D'Aprano
wrote:
> On Sat, 11 May 2013 21:45:12 -0700, rusi wrote:
>
>> I have on occasion expressed that newcomers to this list should be
>> treated with more gentleness than others. And since my own joking may be
>> taken amiss, let me hasten to add (to the
On Fri, May 24, 2013 at 8:58 AM, Malte Forkel wrote:
> As a first step, I am looking for a parser for Python regular
> expressions, or a Python regex grammar to create a parser from.
the sre_parse module is undocumented, but very usable.
> But may be my idea is flawed? Or a similar (or better) t
On Mon, Jun 3, 2013 at 12:34 AM, Dan Sommers wrote:
> On Mon, 03 Jun 2013 13:37:27 +1000, Tim Delaney wrote:
>
>> With the increase in use of higher-level languages, these days
>> Heisenbugs most often appear with multithreaded code that doesn't
>> properly protect critical sections, but as you sa
On Thu, Jun 6, 2013 at 12:24 PM, Rick Johnson
wrote:
> In Python, if you fail to use the return statement, then Python will return
> None, NOT some some value that just happens to be the last line executed in
> the function -- Ruby breaks the law of least astonishment.
Ruby comes from a traditi
Super OT divergence because I am a loser nerd:
On Thu, Jun 6, 2013 at 1:27 PM, rusi wrote:
> Yes, all programming communities have blind-spots. The Haskell
> community's is that Haskell is safe and safe means that errors are
> caught at compile-time.
I don't think Haskell people believe this wi
On Mon, Jun 18, 2012 at 6:49 PM, Emile van Sebille wrote:
> On 6/18/2012 3:16 PM Roy Smith said...
> class myDecorator(object):
> def __init__(self, f):
> self.f = f
> def __call__(self):
> print "Entering", self.f.__name__
> self.f()
> print "Exited", self.f.__na
On Mon, Jun 25, 2012 at 11:35 PM, Steven D'Aprano
wrote:
> There's no real difference between typing print(...) and all the other
> functions in Python. Do you lament having to type len(obj) instead of
> "len obj" or list(zip(a, b, c)) instead of "list zip a b c"?
Surely you mean "list $ zip a b
On Wed, Jun 27, 2012 at 7:02 AM, Chris Angelico wrote:
> Much easier to simply say no.
It's also easier to cease developing Python at all.
By which I mean: just because something is hard doesn't mean it
shouldn't be done. Lots of things Python does are hard, but they make
users' lives easier. Th
On Sun, Jul 1, 2012 at 3:28 AM, Ben Finney wrote:
> Chris Angelico writes:
>> C, SQL, REXX, and many other languages.
>
> So, languages without strong typing then. In that case, I revise my
> statement: I know of no programming language with strong typing that
> would give a newcomer to Python th
On Sun, Jul 1, 2012 at 8:41 PM, Steven D'Aprano
wrote:
> On Sun, 01 Jul 2012 05:18:09 -0400, Devin Jeanpierre wrote:
> Sheesh guys. Don't go hunting through the most obscure corners of
> mathematics for examples of computer scientists who have invented their
> own maths not
On Sun, Jul 1, 2012 at 9:28 PM, Steven D'Aprano
wrote:
> Technically, < in Python is left-associative: a < b < c first evaluates
> a, not b or c. But it is left-associative under the rules of comparison
> operator chaining, not arithmetic operator chaining.
Left-associativity is when a < b < c is
For what it's worth, this is the reason that Allen Short wrote Exocet.
> This way, you can test your code without having to resort to sys.modules
> hackery, and you can better factor your applications by separating
> configuration and environment concerns from the rest of your code.
See:
- http:
On Thu, Jul 5, 2012 at 12:57 AM, Jason Friedman wrote:
> I have some thoughts on a solution, but first, what is 12:45 plus 12
> hours? What is 12:45 minus 13 hours?
Is there anything unusual that can happen for a notion of time that is
dateless, timezone-unaware, and DST-free?
I would imagine t
On Thu, Jul 5, 2012 at 10:34 AM, Laszlo Nagy wrote:
5+1
> 4
4 + 1 is 5 is 4.
(e.g. try 2+3 as well).
-- Devin
--
http://mail.python.org/mailman/listinfo/python-list
On Fri, Jul 6, 2012 at 6:46 PM, Ethan Furman wrote:
> It's checking for equality, not identity.
>>> x = float('nan')
>>> x in [x]
True
It's checking for equality OR identity.
-- Devin
--
http://mail.python.org/mailman/listinfo/python-list
On Sat, Jul 7, 2012 at 3:09 AM, self.python wrote:
> it there somthing that "yield" can't do
> or just it is easier or powerful?
couroutine-like generators can't give up control flow unless they are
the top level function handled by the coroutine controller thing. For
example, we can do this:
On Mon, Jul 9, 2012 at 5:22 PM, Peter wrote:
> One of my favourite questions when interviewing - and it was 100% reliable
> :-) - "what are your hobbies?"
> If the answer included programming then they were hired, if not, then they
> went to the "B" list.
Woe is the poor college grad, who wants
On Sun, Jul 15, 2012 at 9:51 PM, Chris Angelico wrote:
>> if bool(obj) and a==b: # Correct!
>> if obj and a==b: # Incorrect!
>
> That still doesn't answer the question of what bool(obj) should do if
> obj is not a bool, and why if can't do the exact same thing, since if,
> by definition, is
On Mon, Jul 16, 2012 at 12:03 AM, Steven D'Aprano
wrote:
> On Sun, 15 Jul 2012 22:15:13 -0400, Devin Jeanpierre wrote:
>
>> For example, instead of "if stack:" or "if bool(stack):", we could use
>> "if stack.isempty():". This line tells us ex
On Tue, Jul 17, 2012 at 2:25 AM, Steven D'Aprano
wrote:
> It already is part of the collection interface: it is spelled __nonzero__
> (Python 2) or __bool__ (Python 3), and like all dunder methods, it is
> called automatically for you when you use the right syntax:
You're still ignoring what I ac
On Tue, Jul 17, 2012 at 4:45 AM, Lipska the Kat wrote:
> Is Python truly OO or is it just one way to use the language. I see some
> documentation relating to classes but nothing on instantiation .. in fact
> the documentation appears to say that classes are used in a static way e.g
> ClassName.met
On Tue, Jul 17, 2012 at 1:07 PM, Terry Reedy wrote:
> 'type-bondage' is the requirement to restrict function inputs and output to
> one declared type, where the type declaration mechanisms are usually quite
> limited.
This is interesting, I hadn't expected that sort of definition. So
Haskell is n
On Thu, Jul 19, 2012 at 5:01 PM, John Gordon wrote:
>> Since the current evidence indicates the universe will just keep
>> expanding, it's more of a "deep freeze death..."
>
> Heat death means *lack* of heat.
But it doesn't mean low temperature! The term is agnostic as to what
the temperatu
On Fri, Jul 20, 2012 at 11:15 PM, hamilton wrote:
> You are an idiot, or a scammer.
Please be nice.
-- Devin
--
http://mail.python.org/mailman/listinfo/python-list
On Sat, Jul 21, 2012 at 2:25 PM, Chris Angelico wrote:
> On Sun, Jul 22, 2012 at 4:16 AM, Rick Johnson
> wrote:
>> It was a nice run Google. We had good times and bad times. A few smiles and
>> cries.
>>
>> LMBTFY
>
> So, what... you reckon Microsoft is going to be the paragon of
> righteousness
On Sat, Jul 21, 2012 at 5:06 AM, Steven D'Aprano
wrote:
> So there is approximately 0.03 second difference per TWO MILLION
> if...else blocks, or about 15 nanoseconds each. This is highly unlikely
> to be the bottleneck in your code. Assuming the difference is real, and
> not just measurement erro
On Sun, Jul 22, 2012 at 8:29 PM, Chris Angelico wrote:
> On Mon, Jul 23, 2012 at 10:24 AM, Steven D'Aprano
> wrote:
>> Not quite: they have to be an instance of that class.
8<
> Hmm. I would have thought that methods were like all other functions:
> they take their arguments and do code w
On Sun, Jul 22, 2012 at 7:14 PM, Bruce Sherwood
wrote:
> (2) My hand is forced by Apple no longer supporting Carbon. Among
> other aspects of this, Carbon can't be used with 64-bit Python, and
> more and more Mac users of VPython want to use 64-bit Python. So there
> has to be a version of VPython
On Mon, Jul 23, 2012 at 6:02 AM, Lipska the Kat wrote:
> The PYTHONPATH ev is set to /home/lipska/python/dev/mods:.
> in .bashrc
Did you export it? Show us your .bashrc, or the relevant line in it
exactly. (And make sure that it isn't defined multiple times).
Also adding . to the import search p
On Mon, Jul 23, 2012 at 9:52 AM, Henrik Faber wrote:
> If you allow for UTF-8 identifiers you'll have to be horribly careful
> what to include and what to exclude. Is the non-breaking space a valid
> character for a identifier? Technically it's a different character than
> the normal space, so why
On Mon, Jul 23, 2012 at 10:40 AM, Henrik Faber wrote:
> No, you misunderstood me. I didn't say people are going to write
> gibberish. What I'm saying is that as a foreigner (who doesn't know most
> of these characters), it can be hard to accurately choose which one is
> the correct one. This is es
On Mon, Jul 23, 2012 at 9:30 PM, Steven D'Aprano
wrote:
>> Leaving aside the point that this is not directly related to Python, my
>> opinion is that if the authors will not make past and future papers
>> freely available, not even an abstract, they should not ask for valuable
>> free data from fr
On Tue, Jul 24, 2012 at 2:23 AM, Mark Lawrence wrote:
> strictly speaking Python doesn't have variables, it has names. This will
> possibly start a flame war which, by the standards of this ng/ml, will be an
> intense conflagration, hence the duck and cover.
The two terms are nearly synonymous w
On Tue, Jul 24, 2012 at 1:38 AM, Steven D'Aprano
wrote:
> I don't know about a bad idea or not, but it is certainly redundant,
> because Python automatically adds '' (equivalent to '.') to the very
> start of the search path.
No, it only does that if Python is reading commands from stdin, or if
P
On Mon, Jul 23, 2012 at 12:09 PM, Chris Angelico wrote:
> It is, in many places. It's one of the few truly international
> holidays. The next nearest, Pi Day, has two different dates (the
> American and the European - of course, here in Australia, we celebrate
> both).
Here in Canada we celebrate
On Wed, Jul 25, 2012 at 4:40 AM, Ulrich Eckhardt
wrote:
> What do you think?
retort:
def foo():
None
-- Devin
--
http://mail.python.org/mailman/listinfo/python-list
On Wed, Jul 25, 2012 at 12:05 PM, Chris Angelico wrote:
> Simple way of making the iterator display its yielded result. I cannot
> imagine any circumstance in which you'd want to map "pass" over
> everything. But then, as Teresa said, I'm only one, and possibly I'm
> wrong!
True. But it might be
On Wed, Jul 25, 2012 at 2:14 PM, Ian Kelly wrote:
> You can already use pass (or the equivalent) in a lambda.
>
> lambda: None
This lacks my foolish consistency.
-- Devin
--
http://mail.python.org/mailman/listinfo/python-list
On Thu, Jul 26, 2012 at 1:20 AM, Michael Hrivnak wrote:
> If we want pass(), then why not break() and continue()? And also
> def() and class()? for(), while(), if(), with(), we can make them all
> callable objects!
No, you actually can't.
You omit the one control flow statement that could actu
On Thu, Jul 26, 2012 at 5:42 AM, Chris Angelico wrote:
>> You omit the one control flow statement that could actually be turned
>> into a function, raise. None of the rest could in Python (except
>> class), and one of the rest couldn't in any language (def).
>
> Well, if/while/for could be functio
Hey guys,
I recently saw a post saying that PyCon for students' price was
dropped to $100. If you are trying to attract students, why not move
PyCon to take place during the summer? As far as I know, summer vs
spring makes no difference to any members of the general working
population (except for
On Sun, Sep 16, 2012 at 7:52 AM, Mayuresh Kathe wrote:
> new to the group, a quick hello to all. :-)
> does anyone use gedit as an 'ide' for python development?
> if yes, may i know the caveats against using 'idle', 'bpython', etc?
bpython isn't an IDE, it's a good interactive interpreter.
As f
On Sun, Sep 23, 2012 at 7:14 PM, Mark Lawrence wrote:
> Purely for fun I've been porting some code to Python and came across the
> singletonMap[1]. I'm aware that there are loads of recipes on the web for
> both singletons e.g.[2] and immutable dictionaries e.g.[3]. I was wondering
> how to comb
On Thu, Sep 27, 2012 at 2:13 AM, Steven D'Aprano
wrote:
> On Tue, 25 Sep 2012 09:15:00 +0100, Mark Lawrence wrote:
> And a response:
>
> http://data.geek.nz/python-is-doing-just-fine
Summary of that article:
"Sure, you have all these legitimate concerns, but look, cake!"
-- Devin
--
http://mai
On Thu, Sep 27, 2012 at 2:13 AM, Steven D'Aprano
wrote:
> My google-foo is failing me. Is the #python chatroom on freenode archived
> anywhere on the web?
#python doesn't have a policy against quiet bots that log channel
interaction, but AFAIK there are no up-to-date public logs. As
evidence to t
On Thu, Sep 27, 2012 at 10:25 AM, Steven D'Aprano
wrote:
> On Thu, 27 Sep 2012 08:11:13 -0400, Devin Jeanpierre wrote:
>
>> On Thu, Sep 27, 2012 at 2:13 AM, Steven D'Aprano
>> wrote:
>>> On Tue, 25 Sep 2012 09:15:00 +0100, Mark Lawrence wrote: And a
>
On Thu, Sep 27, 2012 at 12:45 PM, Mark Lawrence wrote:
> The article Steven D'Aprano referred to is not a direct response to the
> article I referred to, yet your words are written as if it were. May I ask
> why? Or have I missed something?
Post hoc ergo propter hoc :(
-- Devin
--
http://mail
On Thu, Sep 27, 2012 at 5:28 PM, ForeverYoung wrote:
> Please ignore this post.
> I am testing to see if I can post successfully.
Is there a reason you can't wait until you have something to say / ask
to see if it works? You're spamming a large number of inboxes with
nothing.
-- Devin
--
http:/
On Thu, Sep 27, 2012 at 8:59 PM, alex23 wrote:
> On Sep 28, 2:17 am, Devin Jeanpierre wrote:
>> Uncharitably, it's just a way of hiding one's head in the sand,
>> ignoring any problems Python has by focusing on what problems it
>> doesn't have.
>
> But
On Fri, Sep 28, 2012 at 9:58 PM, Mark Lawrence wrote:
> What's the run time speed like? How much memory does it use? Shouldn't you
> be using the regex module from pypi instead of the standard library re?
> Guess who's borrowed the time machine?
O(n), O(1), and I used RE2.
-- Devin
--
http://
On Sat, Sep 29, 2012 at 1:17 PM, Steven D'Aprano
wrote:
> No. Only add code that works and that you need. Arbitrarily adding calls
> to the superclasses "just in case" may not work:
>
>
>
> py> class Spam(object):
> ... def __init__(self, x):
> ... self.x = x
> ... supe
On Fri, Oct 5, 2012 at 5:31 PM, Ian Kelly wrote:
> On Fri, Oct 5, 2012 at 2:19 PM, vasudevram wrote:
>>
>> http://jugad2.blogspot.in/2012/10/fmap-inverse-of-python-map-function.html
>
> Your fmap is a special case of reduce.
So is map.
def map(f, seq):
return reduce(
lambda rseq, ne
On Fri, Oct 5, 2012 at 7:24 PM, Ian Kelly wrote:
> I realize that. My point is that the function *feels* more like a
> variant of reduce than of map.
>
>> If it's meant as a complaint, it's a poor one.
>
> It's not.
Fair enough all around. Sorry for misunderstanding.
-- Devin
--
http://mail.py
On Thu, Oct 25, 2012 at 10:00 PM, Ed Morton wrote:
> Because there is no solution - there IS no _RE_ that will match a string not
> at the beginning of a line.
Depending on what the OP meant, the following would both work:
- r"^(?!mystring)" (the string does not occur at the beginning)
- r"(?!^)
On Fri, Oct 26, 2012 at 2:40 PM, Steven D'Aprano
wrote:
>> The problem isn't with the associativity, it's with the equality
>> comparison. Replace "x == y" with "abs(x-y)> and all your statements fulfill people's expectations.
>
> O RYLY?
>
> Would you care to tell us which epsilon they should use
On Fri, Oct 26, 2012 at 1:12 AM, Dan Loewenherz wrote:
> It seems the topic of this thread has changed drastically from the original
> message.
>
> 1) "while EXPR as VAR" in no way says that EXPR must be a boolean value. In
> fact, a use case I've run into commonly in web development is popping
On Fri, Oct 26, 2012 at 2:23 AM, Chris Angelico wrote:
> while (client.spop("profile_ids") as profile_id) is not None:
> print profile_id
>
> Why is everyone skirting around C-style assignment expressions as
> though they're simultaneously anathema and the goal? :)
Why should these two statem
On Fri, Oct 26, 2012 at 6:03 PM, Cameron Simpson wrote:
> Any doco would need to make it clear that no order of operation is
> implied, so that this:
>
> x = 1
> y = (2 as x) + x
>
> does not have a defined answer; might be 2, might be 3. Just like any
> other function call with side effects.
On Fri, Oct 26, 2012 at 7:41 PM, Dan Loewenherz wrote:
-- snip insanity --
>
> But this is yucky. I'd much rather have something a bit more clear to the
> reader.
That's why I said I wanted a better iter, not some equality-overriding
object strawman thing.
I was thinking more like this:
for
On Fri, Oct 26, 2012 at 7:56 PM, Cameron Simpson wrote:
> No. Separate _expressions_ are evaluated left to right.
>
> So this:
>
> f(1), f(2)
>
> calls "f(1)" first, then "f(2)". But this:
>
> f(1) + f(2)
>
> need not do so. Counter-documentation welcomed, but the doco you cite
> does not defi
On Fri, Oct 26, 2012 at 8:18 PM, Steven D'Aprano
wrote:
>> I would like a better iter(), rather than a better while loop. It is
>> irritating to pass in functions that take arguments, and it is
>> impossible to, say, pass in functions that should stop being iterated
>> over when they return _eithe
On Mon, Oct 29, 2012 at 12:46 PM, Paul Rubin wrote:
> andrea crotti writes:
>> Also because how doi I make an immutable object in pure Python?
>
> Numbers in Python are already immutable. What you're really looking for
> is a programming style where you don't bind any variable more than once.
N
On Fri, Dec 14, 2012 at 1:13 AM, rusi wrote:
> On Dec 14, 8:33 am, Dave Angel wrote:
>> Do you know any one computer language thoroughly? Or just a little of
>> many languages?
>
> There is a quote by Bruce Lee to the effect:
> I am not afraid of the man who knows 10,000 kicks
> I am afraid of t
On Wed, Jan 25, 2012 at 2:32 PM, Duncan Booth
wrote:
> The problem with your idea is that it breaks compatability with other non-
> Python regular expression engines. Python didn't invent the (?...) syntax,
> it originated with Perl.
>
> Try complaining to a Perl group instead.
The Perl folks did
On Wed, Jan 25, 2012 at 12:16 PM, Rick Johnson
wrote:
> In particular i find the "extension notation" syntax to be woefully
> inadequate. You should be able to infer the action of the extension
> syntax intuitively, simply from looking at its signature.
This is nice in theory. I see no reason to
On Wed, Jan 25, 2012 at 7:14 PM, Rick Johnson
wrote:
> It is germane in the fact that i believe PyParsing, re, and my new
> regex module can co-exist in harmony.
If all you're going to change is the parser, maybe it'd be easier to
get things to coexist if parsers were pluggable in the re module.
On Wed, Jan 25, 2012 at 9:25 PM, Brian wrote:
> Under what situations would a module be available to through the
> interactive interpreter but not the non-interactive?
I don't know if it matches your situation, but one such case is this:
The interactive interpreter (and the interpreter with the
Ooh, runtime turing-complete dependent-types. :)
I'm not sure if you're aware of the literature on this sort of thing.
It's nice reading. A library such as this that's designed for it could
be used for static checks as well.
Probably deserves a better name than "constraintslib", that makes one
th
On Thu, Jan 26, 2012 at 3:24 PM, Nathan Rice
wrote:
> One of the nice things about Haskell is that the language is designed
> in a way that is conducive to
> proving things about your code. A side benefit of being able to prove
> things about your code is that
> in some cases you will be able to
On Mon, Jan 30, 2012 at 6:48 PM, Roy Smith wrote:
> Wow. As somebody who has given plenty of talks, I can tell you this is an
> awesome checklist (and most of it not specific to PyCon).
>
> Let me add one suggestion -- never, ever, ever, type a URL into a browser
> connected to the internet in
On Mon, Jan 30, 2012 at 7:00 PM, Steven D'Aprano
wrote:
> On Mon, 30 Jan 2012 12:41:00 -0500, Charles Yeomans wrote:
>
>> To catch more than one exception type in an except block, one writes
>>
>> except (A, B, C) as e:
>>
>> I'm wondering why it was decided to match tuples, but not lists:
>>
>> e
On Tue, Jan 31, 2012 at 11:23 AM, Charles Yeomans
wrote:
>
> On Jan 31, 2012, at 9:51 AM, Steven D'Aprano wrote:
>
>> On Tue, 31 Jan 2012 08:57:31 -0500, Charles Yeomans wrote:
>>
>>> I don't think of a tuple as a container, and I don't think it a
>>> misunderstanding on my part to think this.
>>
On Tue, Jan 31, 2012 at 6:55 PM, Terry Reedy wrote:
> Q. "How do I make my old model car do something (it cannot do)?"
> A. "Get the free new model that has that feature added."
>
> Of course, there is a cost to giving up the old and familiar and learning
> and adjusting to the new, even when it i
On Wed, Feb 1, 2012 at 10:18 PM, John O'Hagan wrote:
> On Fri, 13 Jan 2012 10:40:47 -0800
> Ethan Furman wrote:
>
>> Steven D'Aprano wrote:
>> > Normally this is harmless, but there is one interesting little
>> > glitch you can get:
>> >
>> t = ('a', [23])
>> t[1] += [42]
>> > Traceback
On Wed, Feb 1, 2012 at 2:53 PM, Terry Reedy wrote:
> And it bothers me that you imput such ignorance to me. You made what I think
> was a bad analogy and I made a better one of the same type, though still
> imperfect. I acknowledged that the transition will take years.
Ah. It is a common attitude
On Thu, Feb 2, 2012 at 11:30 AM, Paul Moore wrote:
> Isn't CoffeeScript just a compiler to convert a cleaner syntax into
> Javascript? If so, why would you need such a thing for Python, where
> the syntax is already clean and simple? :-)
Coffeescript is a more functional syntax. On that note, Py
On Thu, Feb 2, 2012 at 11:28 AM, MRAB wrote:
> Should failed assignment be raising TypeError? Is it really a type
> error?
A failed setitem should be a TypeError as much as a failed getitem
should. Should 1[0] be a TypeError?
-- Devin
--
http://mail.python.org/mailman/listinfo/python-list
On Sat, Feb 4, 2012 at 5:58 AM, Arnaud Delobelle wrote:
> I think what Chris asking is: what is the feature of Common-Lisp
> closures that Python closures share but other languages don't?
>
> I think what he is implying is that there is no such feature. Python
> closures are no more "Common-Lisp-
On Thu, Feb 9, 2012 at 3:50 AM, Zheng Li wrote:
> class A(object):
>@properymethod
>def value1(self):
> return 'value1'
>
>def value2(self):
>return 'value2'
>
> what is the difference between value1 and value2.
There is no such thing as @properymethod
After you chang
Hey Pythonistas,
Consider the regular expression "$*". Compilation fails with the
exception, "sre_constants.error: nothing to repeat".
Consider the regular expression "(?=$)*". As far as I know it is
equivalent. It does not fail to compile.
Why the inconsistency? What's going on here?
-- Devin
On Tue, Feb 14, 2012 at 6:31 AM, Duncan Booth
wrote:
> Here's a clue: No flu viruses are treatable with antibiotics.
Oh my god we're too late! Now they're ALL resistant!
-- Devin
--
http://mail.python.org/mailman/listinfo/python-list
On Tue, Feb 14, 2012 at 8:20 AM, Vinay Sajip wrote:
> $ is a meta character for regular expressions. Use '\$*', which does
> compile.
I mean for it to be a meta-character.
I'm wondering why it's OK for to repeat a zero-width match if it is a
zero-width assertion.
-- Devin
--
http://mail.python
On Tue, Feb 14, 2012 at 10:05 AM, Vlastimil Brom
wrote:
> However, is there any realistic usecase for repeated zero-width anchors?
Maybe. There is a repeated zero-width anchor is used in the Python re
test suite, which is what made me notice this. I assume that came from
some actual use-case. (se
On Tue, Feb 14, 2012 at 1:05 PM, MRAB wrote:
>> And yeah, even something as crazy as ()* works, but as soon as it
>> becomes (a*)* it doesn't work. Weird.
>>
> I think it's a combination of warning the user about something that's
> pointless,
> as in the case of "$*", and producing a pattern which
On Tue, Feb 14, 2012 at 9:08 PM, MRAB wrote:
> There is one place in the re engine where it tries to avoid getting
> stuck in an infinite loop because of a zero-width match, but the fix
> inadvertently causes another bug. It's described in issue #1647489.
Just read the issue. Interesting, didn't
On Wed, Feb 15, 2012 at 8:33 AM, Mel Wilson wrote:
> The usual way to do what you're asking is
>
> if __name__ == '__main__':
> main()
> goodbye()
>
> and write main so that it returns after it's done all the things it's
> supposed to do. If you've sprinkled `sys.exit()` all over your code,
On Fri, Feb 24, 2012 at 9:25 AM, Neil Cerutti wrote:
> The only time I've naively pined for such a thing is when
> misapplying C idioms for finding a minimum value.
>
> Python provides an excellent min implementation to use instead.
min can be a little inconvenient. As soon as anything complicate
On Sat, Feb 25, 2012 at 2:08 PM, Tim Wintle wrote:
> > It seems to me that there are a great many real numbers that can be
> > represented exactly by floating point numbers. The number 1 is an
> > example.
> >
> > I suppose that if you divide that count by the infinite count of all
> > real numb
On Wed, Feb 29, 2012 at 6:43 AM, Chiron wrote:
> Personally, I think this whole issue of precedence in a programming
> language is over-rated. It seems to me that grouping of any non-trivial
> set of calculations should be done so as to remove any possible confusion
> as to intent.
Some language
On Thu, Mar 1, 2012 at 12:07 AM, Chiron wrote:
> On Wed, 29 Feb 2012 23:10:48 -0500, Shmuel (Seymour J.) Metz wrote:
>
>> ROTF,LMAO! You obviously don't have a clue as to what Mathematics means.
>> Free hint: it doesn't mean Arithmetic. You're as bigoted as Xah Lee,
>
>
> Hmm... maybe, instead of
On Sun, Mar 4, 2012 at 1:20 AM, Damjan Georgievski wrote:
> How come?
> I'm using explicit relative imports, I thought they were the new thing?
Explicit relative imports are fine. Implicit relative imports can
create multiple module objects for the same source file, which breaks
things like excep
On Sun, Mar 4, 2012 at 5:58 AM, Justin Drake wrote:
> I am working with an ARM Cortex M3 on which I need to port Python
> (without operating system). What would be my best approach? I just
> need the core Python and basic I/O.
How much time are you willing to budget to this? Porting something to
On Wed, Mar 14, 2012 at 8:27 PM, Chris Angelico wrote:
> On Thu, Mar 15, 2012 at 10:54 AM, Arnaud Delobelle wrote:
>> I don't know this book and there may be a pedagogical reason for the
>> implementation you quote, but pairwise_sum is probably better
>> implemented in Python 3.X as:
>>
>> def pa
There already is a module named cmd2: http://pypi.python.org/pypi/cmd2
-- Devin
On Mon, Mar 19, 2012 at 1:11 AM, wrote:
> Dear all,
>
> I would like to announce the first public release of cmd2, an extension of
> the standard library's cmd with argument parsing, here:
> https://github.com/anntz
On Sun, Mar 25, 2012 at 11:16 AM, Kiuhnm
wrote:
> On 3/25/2012 15:48, Tim Chase wrote:
>>
>> The old curmudgeon in me likes the Pascal method of using "=" for
>> equality-testing, and ":=" for assignment which feels a little closer to
>> mathematical use of "=".
>
>
> Unfortunately, ":=" means "is
On Tue, Mar 27, 2012 at 5:59 PM, Evan Driscoll wrote:
>> The use of eval is dangerous if you are not *completely* sure what is
>> being passed in. Try using pickle instead:
>> http://docs.python.org/release/2.5.2/lib/pickle-example.html
>
>
> Um, at least by my understanding, the use of Pickle is
On Thu, Mar 29, 2012 at 10:03 AM, Chris Angelico wrote:
> You can't merge all of them without making a language that's
> suboptimal at most of those tasks - probably, one that's woeful at all
> of them. I mention SQL because, even if you were to unify all
> programming languages, you'd still need
Agreed with your entire first chunk 100%. Woohoo! High five. :)
On Thu, Mar 29, 2012 at 1:48 PM, Nathan Rice
wrote:
> transformations on lists of data are natural in Lisp, but graph
> transformations are not, making some things awkward.
Eh, earlier you make some argument towards lisp being a uni
On Thu, Mar 29, 2012 at 4:33 PM, Chris Angelico wrote:
> Of course it's POSSIBLE. You can write everything in Ook if you want
> to. But any attempt to merge all programming languages into one will
> either:
In that particular quote, I was saying that the reason that you
claimed we can't merge lan
On Thu, Mar 29, 2012 at 3:50 PM, Nathan Rice
wrote:
> Well, a lisp-like language. I would also argue that if you are using
> macros to do anything, the thing you are trying to do should classify
> as "not natural in lisp" :)
You would run into disagreement. Some people feel that the lisp
philoso
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