On Jan 23, 3:04 pm, Terry Reedy wrote:
> On 1/23/2010 12:17 PM, Steve Howell wrote:
>
> > Terry Reedy said:
>
> > '''
> > If you try writing a full patch, as I believe someone did, or at least
> > a
> > prototype thereof, when the idea was d
On Jan 24, 11:28 am, a...@pythoncraft.com (Aahz) wrote:
> In article ,
> Steve Howell wrote:
>
>
>
> >Even with realloc()'s brokenness, you could improve pop(0) in a way
> >that does not impact list access at all, and the patch would not change
> >the time
On Jan 24, 12:44 pm, Paul Rubin wrote:
> Steve Howell writes:
> > Proposal: Improve list's implementation so that deleting elements from
> > the front of the list does not require an O(N) memmove operation. ...
> > It is possible now, of course, to use a data structure
On Jan 24, 11:24 pm, Paul Rubin wrote:
> Steve Howell writes:
> > There is nothing wrong with deque, at least as far as I know, if the
> > data strucure actually applies to your use case. It does not apply to
> > my use case.
>
> You haven't explained why dequ
On Jan 24, 10:07 pm, Steven D'Aprano
wrote:
> On Sun, 24 Jan 2010 20:12:11 -0800, Steve Howell wrote:
> >> > The most ambitious proposal is to fix the memory manager itself to
> >> > allow the release of memory from the start of the chunk.
>
> &g
On Jan 25, 9:31 am, Steve Howell wrote:
> On Jan 24, 11:24 pm, Paul Rubin wrote:
>
> > Steve Howell writes:
> > > There is nothing wrong with deque, at least as far as I know, if the
> > > data strucure actually applies to your use case. It does not apply t
On Jan 24, 1:51 pm, Daniel Stutzbach
wrote:
> On Sun, Jan 24, 2010 at 1:53 PM, Steve Howell wrote:
> > I don't think anybody provided an actual link, but please correct me
> > if I overlooked it.
>
> I have to wonder if my messages are all ending up in your spa
On Jan 24, 5:26 pm, Robert Kern wrote:
> On 2010-01-23 05:52 , Steven D'Aprano wrote:
> > On Fri, 22 Jan 2010 22:09:54 -0800, Steve Howell wrote:
>
> >> On Jan 22, 5:12 pm, MRAB wrote:
> >>> Steve Howell wrote:
> >>>> I just saw the thread for
On Jan 25, 1:32 pm, Arnaud Delobelle wrote:
> Steve Howell writes:
>
> [...]
>
> > My algorithm does exactly N pops and roughly N list accesses, so I
> > would be going from N*N + N to N + N log N if switched to blist.
>
> Can you post your algorithm? It would be
On Jan 25, 1:32 pm, Arnaud Delobelle wrote:
> Steve Howell writes:
>
> [...]
>
> > My algorithm does exactly N pops and roughly N list accesses, so I
> > would be going from N*N + N to N + N log N if switched to blist.
>
> Can you post your algorithm? It would be
On Jan 25, 1:00 pm, Paul Rubin wrote:
> Steve Howell writes:
> > These are the reasons I am not using deque:
>
> Thanks for these. Now we are getting somewhere.
>
> > 1) I want to use native lists, so that downstream methods can use
> > them as lists.
>
> I
On Jan 25, 1:32 pm, Arnaud Delobelle wrote:
> Steve Howell writes:
>
> [...]
>
> > My algorithm does exactly N pops and roughly N list accesses, so I
> > would be going from N*N + N to N + N log N if switched to blist.
>
> Can you post your algorithm? It would be
--- On Mon, 1/25/10, Chris Colbert wrote:
>
> looking at that code, i think you could solve
> your whole problem with a single called to reversed() (which
> is NOT the same as list.reverse())
>
I do not think that's actually true. It does no good to pop elements off a
copy of the list if th
On Jan 24, 11:28 am, a...@pythoncraft.com (Aahz) wrote:
> In article ,
> Steve Howell wrote:
>
>
>
> >Even with realloc()'s brokenness, you could improve pop(0) in a way
> >that does not impact list access at all, and the patch would not change
> >the time
On Jan 25, 8:31 pm, Paul Rubin wrote:
> Steve Howell writes:
> > I haven't profiled deque vs. list, but I think you are correct about
> > pop() possibly being a red herring
> > For really large lists, I suppose memmove() would eventually start to
> > become
On Jan 25, 9:00 pm, Steve Howell wrote:
> On Jan 24, 11:28 am, a...@pythoncraft.com (Aahz) wrote:
>
>
>
> > In article
> > ,
> > Steve Howell wrote:
>
> > >Even with realloc()'s brokenness, you could improve pop(0) in a way
> > >that doe
On Jan 26, 11:34 pm, Arnaud Delobelle wrote:
> Steve Howell writes:
> > On Jan 25, 1:32 pm, Arnaud Delobelle wrote:
> >> Steve Howell writes:
>
> >> [...]
>
> >> > My algorithm does exactly N pops and roughly N list accesses, so I
> >> &g
I ran the following program, and found its output surprising in one
place:
class OnlyAl:
def __getitem__(self, key): return 'al'
class OnlyBob(dict):
def __getitem__(self, key): return 'bob'
import sys; print sys.version
al = OnlyAl()
bob = OnlyBob()
pri
On Nov 14, 3:26 am, kj wrote:
> One more thing: I found Rob Pike's mutterings on generics (towards
> the end of his rollout video) rather offputting, because he gave
> the impression that some important aspects of the language were
> not even considered before major decisions for it were set in s
On Nov 15, 10:25 am, Steve Howell wrote:
> [see original post...]
> I am most
> interested in the specific mechanism for changing the __getitem__
> method for a subclass on a dictionary. Thanks in advance!
Sorry for replying to myself, but I just realized that the last
statement in
On Nov 15, 11:19 am, Gary Herron wrote:
> Steve Howell wrote:
> > I ran the following program, and found its output surprising in one
> > place:
>
> > class OnlyAl:
> > def __getitem__(self, key): return 'al'
>
> > class Onl
On Nov 15, 12:01 pm, Jon Clements wrote:
> On Nov 15, 7:23 pm, Steve Howell wrote:
>
> > I am more precisely looking for a way to change the behavior of foo
> > ['bar'] (side effects and possibly return value) where "foo" is an
> > instance of a clas
On Nov 15, 12:11 pm, Mark Dickinson wrote:
> On Nov 15, 6:50 pm, a...@pythoncraft.com (Aahz) wrote:
>
> > Anyone remember or know why Python slices function like half-open
> > intervals? I find it incredibly convenient myself, but an acquaintance
> > familiar with other programming languages thin
On Nov 15, 12:01 pm, Jon Clements wrote:
> On Nov 15, 7:23 pm, Steve Howell wrote:
>
> > On Nov 15, 10:25 am, Steve Howell wrote:
>
> > > [see original post...]
> > > I am most
> > > interested in the specific mechanism for changing the __getitem__
&
On Nov 15, 4:03 pm, Christian Heimes wrote:
> Steve Howell wrote:
> > Does anybody have any links that points to the rationale for ignoring
> > instance definitions of __getitem__ when new-style classes are
> > involved? I assume it has something to do with performance or
&
On Nov 15, 4:58 pm, Steve Howell wrote:
> On Nov 15, 4:03 pm, Christian Heimes wrote:
>
> > Try this untested code:
>
> > class Spam(dict):
> > def __getitem__(self, key):
> > getitem = self.__dict__.get("__getitem__", dict.__geti
On Nov 16, 2:35 am, Carl Banks wrote:
> On Nov 15, 2:52 pm, Steve Howell wrote:
>
> > Does anybody have any links that points to the rationale for ignoring
> > instance definitions of __getitem__ when new-style classes are
> > involved? I assume it has something t
On Nov 16, 5:46 pm, Steven D'Aprano
wrote:
> On Mon, 16 Nov 2009 10:32:19 -0800, Steve Howell wrote:
> > Actually, the __getitem__ workaround that I proposed earlier only works
> > on subclasses of dict, not dict themselves. So given a pure dictionary
> > object, it
On Nov 16, 4:06 pm, greg wrote:
> Christian Heimes wrote:
> > Most magic methods are implemented as descriptors. Descriptors only
> > looked up on the type to increase the performance of the interpreter and
> > to simply the C API.
>
> There's also a semantic problem. Since new-style
> classes are
On Nov 16, 10:11 pm, Carl Banks wrote:
> On Nov 16, 10:32 am, Steve Howell wrote:
>
>
>
> > On Nov 16, 2:35 am, Carl Banks wrote:
>
> > > On Nov 15, 2:52 pm, Steve Howell wrote:
>
> > > > Does anybody have any links that points to the rationale
On Nov 17, 7:11 am, Scott David Daniels wrote:
> Steve Howell wrote:
>
> ...
>
> > Eventually, I realized that it was easier to just monkeypatch Django
> > while I was in test mode to get a more direct hook into the behavior I
> > was trying to monitor, and the
During the last few days I have written code in support of a small DDL
language that encapsulates a concise representation of the
manipulations needed to make a deep subcopy of a Python-like data
structure. It is inspired by syntax from mainstream modern languages,
including, of course, Python. The
On the topic of "switch" statements and even-more-concise-then-we-have-
already if/elif/else/end constructs, I have to say that Python does
occasionally force you to write code like the code below. Maybe
"force" is too strong a word, but Python lends itself to if/elif
blocks like below, which get
On Nov 18, 1:32 am, Chris Rebert wrote:
> On Wed, Nov 18, 2009 at 1:15 AM, Steve Howell wrote:
> > On the topic of "switch" statements and even-more-concise-then-we-have-
> > already if/elif/else/end constructs, I have to say that Python does
> > occasionally f
On Nov 18, 1:32 am, Chris Rebert wrote:
> On Wed, Nov 18, 2009 at 1:15 AM, Steve Howell wrote:
> > On the topic of "switch" statements and even-more-concise-then-we-have-
> > already if/elif/else/end constructs, I have to say that Python does
> > occasionally f
On Nov 18, 4:34 am, "M.-A. Lemburg" wrote:
> Steve Howell wrote:
> > [...]
> > Here is an example of the DDL (and I hate the terminology "DDL," just
> > cannot think of anything better):
>
> > {
> >
On Nov 18, 2:22 pm, Steven D'Aprano
wrote:
> On Wed, 18 Nov 2009 02:06:49 -0800, Steve Howell wrote:
> > P.S. The underscores before the method names might look a little funny
> > for inner methods, but it's the nature of the code..._dict and _list
> > would lead
On Nov 18, 3:02 pm, Steven D'Aprano
wrote:
>
> That depends on the code. In particular, it depends on how coupled the
> code is. Ideally, you should have loosely coupled code, not highly
> coupled. If the code is loosely coupled, then there's no problem with
> understanding it in isolation. If the
On Nov 18, 3:02 pm, Steven D'Aprano
wrote:
> Lexical duplication is one of the weakest code smells around, because it
> is so prone to false negatives. You often can't avoid referring to the
> same lexical element multiple times:
>
> def sinc(x):
> if x != 0:
> return sin(x)/x
> re
On Nov 18, 5:13 pm, Steven D'Aprano
wrote:
> On Wed, 18 Nov 2009 15:58:24 -0800, Steve Howell wrote:
> > On Nov 18, 2:22 pm, Steven D'Aprano
> > wrote:
> >> On Wed, 18 Nov 2009 02:06:49 -0800, Steve Howell wrote:
> >> > P.S. The underscor
On Nov 18, 5:42 pm, Steven D'Aprano
wrote:
> On Wed, 18 Nov 2009 17:14:27 -0800, Steve Howell wrote:
> > In my rewritten code, here is the smell:
>
> > dispatches = {
> > 'dict': _dict,
> > 'list': _list,
>
On Nov 19, 10:53 am, papa hippo wrote:
> The prime goal of 'phileas' is to enable html code to be seamlessly
> included in python code in a natural looking syntax, without resorting
> to templatng language.
>
> see:
>
> http://larry.myerscough.nl/phileas_project/
>
> I intend to submit phileas to
I have been writing some code that parses a mini-language, and I am
running into what I know is a pretty common design pattern problem,
but I am wondering the most Pythonic way to solve it.
Basically, I have a bunch of really simple classes that work together
to define an expression--in my oversim
On Nov 21, 11:20 am, John Roth wrote:
> On Nov 21, 8:40 am, Duncan Booth wrote:
>
> > a...@pythoncraft.com (Aahz) wrote:
> > > Comparing Go to another computer language -- do you recognize it?
>
> > >http://www.cowlark.com/2009-11-15-go/
>
> > Yes, spotted it at the first 'fi'.
>
> This isn't the
On Nov 21, 4:07 pm, MRAB wrote:
>
> I don't see the point of EvalNode and PrettyPrintNode. Why don't you
> just give Integer, Sum and Product 'eval' and 'pprint' methods?
That's a good question, and it's the crux of my design dilemma. If
ALL I ever wanted to to with Integer/Sum/Product was to ev
On Nov 21, 4:33 pm, Richard Thomas wrote:
>
> This looks more structurally sound:
>
> class Node(object):
> def eval(self):
> raise NotImplementedError
> def pprint(self):
> raise NotImplementedError
>
My objection to the interface you describe is that Node defines the
type of o
On Nov 21, 12:12 am, Steven D'Aprano wrote:
> On Thu, 19 Nov 2009 23:22:22 -0800, Scott David Daniels wrote:
>
> > If you've actually typed on a physical typewriter, you know that moving
> > the carriage back is a distinct operation from rolling the platen
> > forward;
>
> I haven't typed on a phy
On Nov 21, 11:33 pm, Gregory Ewing
wrote:
> Steve Howell wrote:
> > If you are
> > going to couple character sets to their legacy physical
> > implementations, you should also have a special extra character to dot
> > your i's and cross your t's.
>
> No,
On Nov 22, 7:55 am, Simon Forman wrote:
> On Sun, Nov 22, 2009 at 4:50 AM, Diez B. Roggisch wrote:
>
>
>
> > Steve Howell schrieb:
>
> >> On Nov 21, 4:07 pm, MRAB wrote:
>
> >>> I don't see the point of EvalNode and PrettyPrintNode. Why don&#x
On Nov 22, 2:50 pm, Marc Leconte wrote:
> Dear all,
>
> I have a problem with the following code (ubuntu 8.04, Python 2.5.2):
>
> class Toto(object):
> def __init__(self, number, mylist=[])
> self.number=number
> self.mylist=mylist
> pass
>
On Nov 22, 3:14 pm, Steve Howell wrote:
> Explanations of why you need to write it that will follow...
I knew this had to be written up somewhere...
http://www.ferg.org/projects/python_gotchas.html#contents_item_6
--
http://mail.python.org/mailman/listinfo/python-list
On Nov 22, 7:28 pm, Lie Ryan wrote:
> Roy Smith wrote:
> > If I've got an object foo, and I execute:
>
> > foo.bar += baz
>
> > exactly what happens if foo does not have a 'bar' attribute? It's
> > pretty clear that foo.__getattr__('bar') gets called first, but it's a
> > little murky after that.
On Nov 22, 6:06 pm, "~km" wrote:
> Hi together,
>
> I'm a python-proficient newbie and want to tackle a program with
> Python 2.x, which basically organizes all my digital books (*.pdf,
> *.chm, etc..) and to give them specific "labels", such as:
>
> "Author" -> string
> "Read" -> boolean
> "Last
On Nov 22, 9:11 pm, n00m wrote:
> > The first statement is creating a whole new list;
>
> Yes but *imo* not quite exactly so.
> We can't think of 2 lists as of absolutely independent
> things.
> [...]
You are correct that two lists can both have the same mutable object
as items, and if you mutate
On Nov 23, 7:22 am, Brendan wrote:
> In KirbyBase there is a method that uses string exceptions for
> control, even though it has a defined exception. Is there any reason
> the string exceptions below could not be replaced?
> i.e. in code below replace:
> raise "No Match"
> with:
> raise KBError()
On Nov 23, 2:47 am, Antoine Pitrou wrote:
> Le Mon, 23 Nov 2009 02:36:33 -0600, Robert Kern a écrit :
>
>
>
> > I think there is an overall design sensibility, it's just not a
> > human-facing one. They claim that they designed the syntax to be very
> > easily parsed by very simple tools in order
On Feb 10, 5:59 am, Muhammad Alkarouri wrote:
> Hi everyone,
>
> What is the simplest way to access the attributes of a function from
> inside it, other than using its explicit name?
> In a function like f below:
>
> def f(*args):
> f.args = args
> print args
>
> is there any other way?
>
On Feb 13, 6:41 pm, a...@pythoncraft.com (Aahz) wrote:
> In article ,
> Alf P. Steinbach wrote:
>
>
>
> >My original statement, with reference to the Java language spec,
> >didn't say much more about the language than that it has assignable
> >references.
>
> Assuming this is what you're referring
On Feb 13, 6:10 pm, MRAB wrote:
> Alf P. Steinbach wrote:
> > * Steve Howell:
> >> This thread is interesting on many levels. What is the core question
> >> that is being examined here?
>
> > I think that regarding the technical it is whether a Python na
This thread is interesting on many levels. What is the core question
that is being examined here?
--
http://mail.python.org/mailman/listinfo/python-list
On Feb 13, 7:53 pm, Steven D'Aprano wrote:
> On Sat, 13 Feb 2010 18:54:34 -0800, Steve Howell wrote:
> > On Feb 13, 6:41 pm, a...@pythoncraft.com (Aahz) wrote:
> > > Regardless of how CPython manages its state internally, Python as a
> > > programming language d
On Feb 13, 9:13 pm, Steven D'Aprano wrote:
> On Sat, 13 Feb 2010 20:11:06 -0800, Steve Howell wrote:
> > For a suitably wide definition of pointers CPython does indeed have
> > pointers, and your example is only a weaker case of that truth. There
> > is no reductio a
On Feb 13, 11:21 pm, Steven D'Aprano wrote:
> On Sat, 13 Feb 2010 21:33:50 -0800, Steve Howell wrote:
> > You seem to be missing the point that "curly braces" is a concrete
> > term that very specifically applies to spelling.
>
> And you seem to be missin
On Feb 10, 6:16 am, Steven D'Aprano wrote:
>
> Alf, although your English in this forum has been excellent so far, I
> understand you are Norwegian, so it is possible that you aren't a native
> English speaker and possibly unaware that quotation marks are sometimes
> ambiguous in English.
>
> Whil
On Feb 14, 7:11 am, Steven D'Aprano wrote:
> On Sat, 13 Feb 2010 23:45:47 -0800, Steve Howell wrote:
> > The term "pointer" is very abstract. Please give me a concrete
> > definition of a pointer.
>
> A programming language data type whose value directly
On Feb 14, 9:48 am, Mark Dickinson wrote:
> On Feb 14, 4:53 pm, mukesh tiwari
> wrote:
>
> > Hello everyone. I am new to python and previously i did programming in
> > c/c++.Could some one please help me to improve the run time for this
> > python program as i don't have idea how to optimized thi
On Feb 14, 10:32 am, Steve Holden wrote:
> rantingrick wrote:
> > On Feb 12, 4:10 pm, Steve Holden wrote:
> >> Antoine Pitrou wrote:
> >>> Le Fri, 12 Feb 2010 17:14:57 +, Steven D'Aprano a écrit :
>
> > On Feb 12, 4:10 pm, Steve Holden wrote:
> >> Antoine Pitrou wrote:
> >>> Le Fri, 12 Feb 2
On Feb 11, 5:50 pm, Steven D'Aprano wrote:
> On Thu, 11 Feb 2010 15:39:09 -0800, Jeremy wrote:
> > My Python program now consumes over 2 GB of memory and then I get a
> > MemoryError. I know I am reading lots of files into memory, but not 2GB
> > worth.
> > 2. When do I need
> > to manually a
On Feb 14, 11:52 am, Mark Dickinson wrote:
> On Feb 14, 4:53 pm, mukesh tiwari
> wrote:
>
> > Hello everyone. I am new to python and previously i did programming in
> > c/c++.Could some one please help me to improve the run time for this
> > python program as i don't have idea how to optimized th
On Feb 15, 8:15 am, Lacrima wrote:
> Hello!
>
> I am newbie mastering test driven development. I can't clarify myself
> which mock library to use.
> There are number of them and which one do you prefer?
>
> Two libraries that attracted my attention are:
> * minimock
> * dingus
> As for me the late
On Feb 17, 5:39 pm, Steven D'Aprano
wrote:
> On Wed, 17 Feb 2010 17:04:00 -0800, Jonathan Gardner wrote:
> > (What the heck is a procedure, anyway? Is this different from a
> > subroutine, a method, or a block?)
>
> The name is used in Pascal, which probably means it originated from
> Fortran or A
On Feb 16, 4:19 pm, Jonathan Gardner
wrote:
> On Feb 16, 11:41 am, Andrej Mitrovic
> wrote:
>
>
>
> > On Feb 16, 7:38 pm, Casey Hawthorne
> > wrote:
>
> > > Interesting talk on Python vs. Ruby and how he would like Python to
> > > have just a bit more syntactic flexibility.
>
> > >http://blog.ex
On Feb 18, 1:23 am, Duncan Booth wrote:
> Jonathan Gardner wrote:
> > On Feb 17, 12:02 am, Lawrence D'Oliveiro > central.gen.new_zealand> wrote:
> >> In message
> >> <8ca440b2-6094-4b35-80c5-81d000517...@v20g2000prb.googlegroups.com>,
>
> >> Jonathan Gardner wrote:
> >> > I used to think anonymo
On Feb 18, 7:50 am, Duncan Booth wrote:
> Steve Howell wrote:
> > If this is an argument against using anonymous functions, then it is a
> > quadruple strawman.
>
> > Shipping buggy code is a bad idea, even with named functions.
>
> I doubt very much whether I have
On Feb 18, 3:00 pm, Steven D'Aprano wrote:
> [...]
> You wouldn't name your functions:
>
> f01, f02, f03, f04, ... f99
>
Exactly.
> (say), unless you were trying to deliberately obfuscate your code.
> Anonymous functions are even more obfuscated than that. You can get away
> with it so long as y
On Feb 18, 3:04 pm, "sjdevn...@yahoo.com" wrote:
> On Feb 18, 11:15 am, Steve Howell wrote:
>
> > def print_numbers()
> > [1, 2, 3, 4, 5, 6].map { |n|
> > [n * n, n * n * n]
> > }.reject { |square, cube|
> >
On Feb 18, 2:49 pm, Jonathan Gardner
wrote:
> On Feb 18, 8:15 am, Steve Howell wrote:
>
>
>
> > def print_numbers()
> > [1, 2, 3, 4, 5, 6].map { |n|
> > [n * n, n * n * n]
> > }.reject { |square, cube|
> > sq
On Feb 18, 7:58 pm, Paul Rubin wrote:
> Steve Howell writes:
> >> But frankly, although there's no reason that you _have_ to name the
> >> content at each step, I find it a lot more readable if you do:
>
> >> def print_numbers():
> >>
On Feb 18, 8:27 pm, "sjdevn...@yahoo.com" wrote:
> On Feb 18, 10:58 pm, Paul Rubin wrote:
>
> Steve Howell writes:
> > >> But frankly, although there's no reason that you _have_ to name the
> > >> content at each step, I find it a lot mor
On Feb 18, 7:58 pm, Paul Rubin wrote:
> Steve Howell writes:
> >> But frankly, although there's no reason that you _have_ to name the
> >> content at each step, I find it a lot more readable if you do:
>
> >> def print_numbers():
> >>
On Feb 18, 9:41 pm, Steven D'Aprano wrote:
> On Thu, 18 Feb 2010 22:48:21 -0500, Steve Holden wrote:
> > Next week: Lesson 2 - Ad Hominem Attacks
>
> I wouldn't pay any attention to Steve, all Stevens are notorious liars.
>
> --
> Steven
Especially when their last name starts with H.
Cheers,
St
On Feb 18, 9:46 pm, Steven D'Aprano wrote:
> On Thu, 18 Feb 2010 19:57:35 -0800, Steve Howell wrote:
> > The names you give to the intermediate results here are terse--"tuples"
> > and "filtered"--so your code reads nicely.
>
> > In a more real
On Feb 18, 9:37 pm, Kurt Smith wrote:
> On Thu, Feb 18, 2010 at 10:46 PM, Steve Howell wrote:
> > On Feb 18, 2:49 pm, Jonathan Gardner
> > wrote:
> >> On Feb 18, 8:15 am, Steve Howell wrote:
>
> >> > def print_numbers()
> >> > [1,
On Feb 18, 9:52 pm, Gregory Ewing wrote:
> Steve Howell wrote:
> > Python may not support the broadest notion of anonymous functions, but
> > it definitely has anonymous blocks. You can write this in Python:
>
> > for i in range(10):
> > p
On Feb 19, 7:50 am, Roald de Vries wrote:
> > This pipeline idea has actually been implemented further, see > blog.onideas.ws/stream.py>.
>
> > from stream import map, filter, cut
> > range(10) >> map(lambda x: [x**2, x**3]) >> filter(lambda t: t[0]!
> > =25 and t[1]!=64) >> cut[1] >> list
> > [0
On Feb 19, 9:30 am, Steven D'Aprano wrote:
> On Fri, 19 Feb 2010 08:32:53 -0800, Steve Howell wrote:
> > The extra expressiveness of Ruby comes from the fact that you can add
> > statements within the block, which I find useful sometimes just for
> > debugging purpos
On Feb 20, 6:13 am, Michael Sparks wrote:
> On Feb 18, 4:15 pm, Steve Howell wrote:
> ...
>
> > def print_numbers()
> > [1, 2, 3, 4, 5, 6].map { |n|
> > [n * n, n * n * n]
> > }.reject { |square, cube|
> > squar
On Feb 20, 5:55 pm, marwie wrote:
> On 21 Feb., 02:30, Steven D'Aprano
> cybersource.com.au> wrote:
> > Python lists are arrays of pointers to objects, so copying a slice is
> > fast: it doesn't have to copy the objects, just pointers. Deleting from
> > the end of the list is also quick, because
On Feb 22, 8:35 pm, Jonathan Gardner
wrote:
> On Mon, Feb 22, 2010 at 12:31 PM, John Bokma wrote:
>
> > In my class there where basically 2 groups of people: the ones who got
> > functional programming and the ones who had a hard time with it. The
> > latter group consisted mostly of people who h
On Feb 22, 9:11 pm, Steve Howell wrote:
> On Feb 22, 8:35 pm, Jonathan Gardner
> wrote:
>
>
>
> > On Mon, Feb 22, 2010 at 12:31 PM, John Bokma wrote:
>
> > > In my class there where basically 2 groups of people: the ones who got
> > > functional program
On Feb 22, 9:06 pm, Paul Rubin wrote:
> Steve Howell writes:
> > My gut instinct is that functional programming works well for lots of
> > medium sized problems and it is worth learning.
>
> I think it's worth learning because it will make you a better programmer
>
On Feb 22, 9:45 pm, Chris Rebert wrote:
> On Mon, Feb 22, 2010 at 8:36 PM, Jonathan Gardner
>
> wrote:
> > On Mon, Feb 22, 2010 at 1:56 PM, AON LAZIO wrote:
> >> That will be superb
>
> > It already has.
>
> Indeed. Python is at position 7, just behind C#, in the TIOBE
> Index:http://www.tiobe.
On Mar 3, 7:46 am, mk wrote:
> Paul Rubin wrote:
> > Patrick Maupin writes:
> >> One of my complaints. If you had read the document you would have
> >> seen others. I actually have several complaints about YAML, but I
> >> tried to write a cogent summary.
> > Yaml sucks, but seems to have gotte
On Mar 4, 7:32 pm, Steven D'Aprano wrote:
>
> Python does have it's own singletons, like None, True and False. For some
> reason, they behave quite differently: NoneType fails if you try to
> instantiate it again, while bool returns the appropriate existing
> singleton:
>
> >>> NoneType = type(Non
On Mar 3, 7:10 am, "Alf P. Steinbach" wrote:
> For C++ Petru Marginean once invented the "scope guard" technique (elaborated
> on
> by Andrei Alexandrescu, they published an article about it in DDJ) where all
> you
> need to do to ensure some desired cleanup at the end of a scope, even when the
On Mar 4, 12:52 am, Paul Rubin wrote:
> mk writes:
> > OK, but how? How would you make up e.g. for JSON's lack of comments?
>
> Modify the JSON standard so that "JSON 2.0" allows comments.
If you don't control the JSON standard, providing a compelling
alternative to JSON might be the best way to
On Mar 4, 9:36 pm, Gregory Ewing wrote:
> Paul Rubin wrote:
> > ReST was another solution in search of a problem.
>
> I think the basic idea behind ReST is quite good, i.e.
> understanding as markup various typographical conventions
> that make sense in plain text, such as underlined
> headings, b
On Mar 4, 11:46 pm, Paul Rubin wrote:
>
> Ehh, either the JSON standardizers care about this issue or else they
> don't. JSON (as currently defined) is a machine-to-machine
> serialization format and just isn't that good a choice for handwritten
> files. Adding a comment specification is a small
On Mar 5, 8:29 am, Mike Kent wrote:
> On Mar 4, 8:04 pm, Robert Kern wrote:
>
> > No, the try: finally: is not implicit. See the source for
> > contextlib.GeneratorContextManager. When __exit__() gets an exception from
> > the
> > with: block, it will push it into the generator using its .throw(
On Mar 4, 5:04 pm, Robert Kern wrote:
> On 2010-03-04 15:19 PM, Mike Kent wrote:
>
>
>
> > On Mar 3, 12:00 pm, Robert Kern wrote:
> >> On 2010-03-03 09:39 AM, Mike Kent wrote:
>
> >>> What's the compelling use case for this vs. a simple try/finally?
>
> >>> original_dir = os.getcwd()
> >>>
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