}
>>> a
{1, 2, 3}
>>> a |= {4}
>>> a
{1, 2, 3, 4}
>>> a |= {4}
>>> a
{1, 2, 3, 4}
>>> _
Cheers,
- Alf
--
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* Alf P. Steinbach:
Format: PDF
http://preview.tinyurl.com/ProgrammingBookP3>
The new stuff, section 2.7, is about programs as simulations and
handling data, focusing on modeling things. It includes some Python GUI
programming. The plan is to discuss containers like lists
* Alf P. Steinbach:
* Alf P. Steinbach:
Format: PDF
http://preview.tinyurl.com/ProgrammingBookP3>
The new stuff, section 2.7, is about programs as simulations and
handling data, focusing on modeling things. It includes some Python
GUI programming. The plan is to discuss containers l
* Mensanator:
On Dec 16, 4:41 pm, Mensanator wrote:
On Dec 14, 1:23 am, "Alf P. Steinbach" wrote:
* Alf P. Steinbach:
Format: PDF
http://preview.tinyurl.com/ProgrammingBookP3>
The new stuff, section 2.7, is about programs as simulations and
handling data, focusin
* Mensanator:
On Dec 16, 5:45 pm, "Alf P. Steinbach" wrote:
* Mensanator:
On Dec 16, 4:41 pm, Mensanator wrote:
On Dec 14, 1:23 am, "Alf P. Steinbach" wrote:
* Alf P. Steinbach:
Format: PDF
http://preview.tinyurl.com/ProgrammingBookP3>
The new stuff
#x27; very over-zealous "security" measures).
Cheers & hth.,
- Alf
--
http://mail.python.org/mailman/listinfo/python-list
you're constructing n tuples that you're not
constructing in the loop.
Have you tried this with
dip1 = [dp - 0.01 if dp == 90 else dp for dp in dipList]
?
Cheers & hth.,
- Alf
--
http://mail.python.org/mailman/listinfo/python-list
o UC...
So both these two deviations from Python practice are /intentional/, since this
is a book about programming, not about Python the language & how to conform to
idiosyncratic language-specific conventions.
But, if there are other deviations from Python practice I'd be very glad
uctures, that this flaw gives C++
iterators the power of "goto" but also with all the negative baggage...
I'm too lazy to Google, but you might search for Alexandrescu and "ranges", and
possibly throw in "iterators" among the search terms.
Cheers & hth.,
- Alf
--
http://mail.python.org/mailman/listinfo/python-list
* Carl Banks:
On Dec 18, 11:08 am, "Alf P. Steinbach" wrote:
* Carl Banks:
On Dec 17, 10:00 pm, Brendan Miller wrote:
On Thu, Dec 17, 2009 at 6:44 PM, Steven D'Aprano
wrote:
On Thu, 17 Dec 2009 12:07:59 -0800, Brendan Miller wrote:
I was thinking it would be cool to m
east
provide uppercase names so as conform to very firmly established convention.
There might even be tools that rely on that convention. But for application code
the uppercase names are just distracting, and they don't help you...
Cheers & hth.,
- Alf
--
http://mail.python.org/mailman/listinfo/python-list
* Steven D'Aprano:
On Fri, 18 Dec 2009 19:00:48 +0100, Alf P. Steinbach wrote:
In fact almost no Python
code does, but then it seems that people are not aware of how many of
their names are constants and think that they're uppercasing constants
when in fact they're not. E.g. ro
* Steven D'Aprano:
On Sat, 19 Dec 2009 01:25:48 +0100, Alf P. Steinbach wrote:
That said, and a bit off-tangent to your comment's main thrust, the time
spent on coding that repeated-division-by-2 optimization would, I think,
be better spent googling "Collatz Conjecture"
class Seq( object ):
E.g.,
>>> class A: pass
...
>>> A.__bases__
(,)
>>>
>>> class B( object ): pass
...
>>> B.__bases__
(,)
>>> _
Curiously I can't find anything about 'object' in the language spec, but
an you can ever find by Googling!
And how did I achieve that? By writing such code. Be a good boy and
maybe I'll show you how to do Ulam's Spiral with Turtle Graphics.
It's probably good for you that you know so much about Collatz.
I fail to see the relevance to anything.
* Steven D'Aprano:
On Sat, 19 Dec 2009 04:04:51 +0100, Alf P. Steinbach wrote:
* Steven D'Aprano:
On Fri, 18 Dec 2009 19:00:48 +0100, Alf P. Steinbach wrote:
In fact almost no Python
code does, but then it seems that people are not aware of how many of
their names are constants
* Steven D'Aprano:
On Sat, 19 Dec 2009 04:29:22 +0100, Alf P. Steinbach wrote:
* Steven D'Aprano:
On Sat, 19 Dec 2009 01:25:48 +0100, Alf P. Steinbach wrote:
That said, and a bit off-tangent to your comment's main thrust, the
time spent on coding that repeated-division-by
* John Posner:
On Fri, 18 Dec 2009 13:00:48 -0500, Alf P. Steinbach
wrote:
Chapter 2 is about Basic Concepts (of programming). It's the usual:
variables, ...
1. Overall suggestion
You have a tendency to include non-pertinent asides [1]. But then,
rambling a bit endows a manuscript
as illegal and manually typed in by some kid. He he, they do a great
service for us who don't have ready continuous access to a university library!
Cheers,
- Alf
PS: Argh! Someone did it -- serious programming intro based on Python --
already! However, there's a difference betwee
dit facility?
I suggest you download a programmers' editor (like Notepad++ or PsPad) for
programming work and use the basic Python interpreter for interactive work. The
basic interpreter lives in a standard Window console window where you can use up
and down arrow keys, F8 completion, F7 for list of earlier commands, etc (as
documented by the doskey command in the Windows command interpreter). Just
forget IDLE in windows: while Windows console windows are something from the
middle ages, IDLE seems to stem from a period before that!
Cheers & hth.,
- Alf
PS: Shameless plug: take a look at http://tinyurl.com/programmingbookP3>,
it's for Windows.
--
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* Alf P. Steinbach:
* W. eWatson:
When I use numpy.__doc__ in IDLE under Win XP, I get a heap of words
without reasonable line breaks.
"\nNumPy\n=\n\nProvides\n 1. An array object of arbitrary
homogeneous items\n 2. Fast mathematical operations over arrays\n 3.
Linear Al
n & terminology. 2
3.1.1 The vocabulary and notation of basic arithmetic, including Σ and Π. 2
3.1.2 Quadratic and exponential time & memory (also introducing timeit). 5
-EOT_ 9
Cheers,
- Alf
PS: Hm, Open Office's PDF generation does funny things with Greek sigmas inside
formula
self.items = seq
class A: # Your example
def __init__( self, foo = None, Bar = None ):
self._foo = _Foo( foo )
self._bar = bar
def set_foo( self, foo ):
self._foo = _Foo( foo )
foo = property( setter = set_foo )
Cheers & hth.,
- Alf
--
http://mai
doubt that there are many errors etc., all mine!).
* Alf P. Steinbach, in [comp.lang.python]:
Tentatively titled "Foundations".
Also, these first 2/3 sections may be moved to some later point, i.e.
even the structure is tentative, but I'd value comments!
http://tinyurl.c
ring to an
earlier posting by Alex Martelli, was broken.
I believe it was the posting available here: http://www.opensubscriber.com/message/python-list@python.org/2659890.html>.
Cheers,
- Alf
--
http://mail.python.org/mailman/listinfo/python-list
onfig, but I think this is default) is
invisible when you're looking at the debugger window for single stepping. You
can see it by switching back to the source code window but that's annoying, not
very practical. Invisible highlighting of the current line, he he...
Cheers &a
Maybe I've misunderstood something (in that case glad to learn!), but I believe
PhotoImage is not a widget, and that a PhotoImage has to be presented in e.g. a
Label widget or some other widget that's able to display images.
Cheers,
- Alf
--
http://mail.python.org/mailman/listinfo/python-list
d' and then write
list( repeat_items_in( [1, 2, 3], 3 ) )
Re the thing I don't understand: it's the same in C++, people using hours on
figuring out how to do something very simple in an ungrokkable indirect and
"compiled" way using template metaprogramming stuff, when they could just write
a simple 'for' loop and be done with in, say, 3 seconds, and much clearer too!
Cheers,
- Alf
--
http://mail.python.org/mailman/listinfo/python-list
* Steven D'Aprano:
On Mon, 11 Jan 2010 08:56:36 +0100, Alf P. Steinbach wrote:
* Paul Rudin:
Sebastian writes:
I have an array x=[1,2,3]
In python such an object is called a "list".
(In cpython it's implemented as an automatically resizable array.)
I don't t
* Chris Rebert:
On Mon, Jan 11, 2010 at 1:03 AM, Alf P. Steinbach wrote:
* Steven D'Aprano:
On Mon, 11 Jan 2010 08:56:36 +0100, Alf P. Steinbach wrote:
* Paul Rudin:
Sebastian writes:
I have an array x=[1,2,3]
In python such an object is called a "list".
(In cpython i
* Chris Rebert:
On Mon, Jan 11, 2010 at 2:20 AM, Alf P. Steinbach wrote:
* Chris Rebert:
On Mon, Jan 11, 2010 at 1:03 AM, Alf P. Steinbach wrote:
* Steven D'Aprano:
On Mon, 11 Jan 2010 08:56:36 +0100, Alf P. Steinbach wrote:
* Paul Rudin:
Sebastian writes:
Using the term &
* suresh.amritapuri:
On Jan 9, 9:51 pm, "Alf P. Steinbach" wrote:
* Lie Ryan:
On 1/9/2010 8:43 AM, suresh.amritapuri wrote:
Hi,
In PIL, how to display multiple images in say m rows and n colums when
I have m*n images.
suresh
Tkinter has PhotoImage widget and PIL has support for t
ogy (it gets more unreliable year by year).
It's easier to place the comment here:
There seems to be some controversy about this and other matters of
datetime.
<http://blog.twinapex.fi/2008/06/30/relativity-of-time-shortcomings-in-python-datetime-and-workaround/>
No, not at all. :-)
Instead, just ignore silly requests for message id's.
Cheers & hth.,
- Alf
--
http://mail.python.org/mailman/listinfo/python-list
* Steve Holden:
Alf P. Steinbach wrote:
* W. eWatson:
Ben Finney wrote:
"W. eWatson" writes:
See my post about the datetime controversy about 3-4 posts up from
yours.
This forum is distributed, and there's no “up” or “3-4 messages” that is
common for all readers.
Cou
er Account somewhere. But hopefully it doesn't?
Cheers & hth.,
- Alf
--
http://mail.python.org/mailman/listinfo/python-list
* Steve Holden:
Alf P. Steinbach wrote:
[...]
PS: It would be nice if someone(TM) could describe here in detail how to
properly report errors like this. Of course I'm not going to do it if it
involves establishing Yet Another Account somewhere. But hopefully it
doesn't?
That's
* Alf P. Steinbach:
* Steve Holden:
Alf P. Steinbach wrote:
[...]
PS: It would be nice if someone(TM) could describe here in detail how to
properly report errors like this. Of course I'm not going to do it if it
involves establishing Yet Another Account somewhere. But hopefully it
do
* Stefan Behnel:
Alf P. Steinbach, 12.01.2010 12:51:
Well how f*g darn patient do they expect me to be?
I've decided: I'm not.
Oh sh**, just as I typed the period above the mail finally arrived.
It's been, let's see, about 20+ minutes!
And still some miles to go.
* Stefan Behnel:
Alf P. Steinbach, 12.01.2010 13:10:
* Stefan Behnel:
Maybe you should just stop using the module. Writing the code
yourself is certainly going to be faster than reporting that bug,
don't you think?
It's part of the standard Python distribution.
Don't you th
* André:
On Jan 12, 9:33 am, "Alf P. Steinbach" wrote:
Well, this is for my Python (actually, beginning programmer) writings, at
http://tinyurl.com/programmingbookP3
Thanks for writing this book. I just had a quick look at the
beginning of it where you write:
===
As of th
* Steve Holden:
Alf P. Steinbach wrote:
* Stefan Behnel:
Alf P. Steinbach, 12.01.2010 12:51:
Well how f*g darn patient do they expect me to be?
I've decided: I'm not.
Oh sh**, just as I typed the period above the mail finally arrived.
It's been, let's see, about 20+
* Steve Holden:
Alf P. Steinbach wrote:
If you have any suggestions for improving things (and the same goes for
any other readers) I will be happy to listen to them. I do agree that
the bug tracker is a rather high hurdle for people to have to jump over
just to offer feedback on software faults
* Steve Holden:
Alf P. Steinbach wrote:
* Steve Holden:
[...]
FYI there is already some feedback in the tracker.
Yeah, someone who had the bright idea that maybe there isn't a bug,
thinking instead that maybe a "wrong" name in *a comment* might be the
culprit -- of all
* Steven D'Aprano:
On Tue, 12 Jan 2010 23:42:28 +0100, Alf P. Steinbach wrote:
* André:
On Jan 12, 9:33 am, "Alf P. Steinbach" wrote:
Well, this is for my Python (actually, beginning programmer) writings,
at
http://tinyurl.com/programmingbookP3
Thanks for writing thi
* Steven D'Aprano:
On Tue, 12 Jan 2010 23:47:31 +0100, Alf P. Steinbach wrote:
PS: Next time it would have helped to include a URL to the issue.
http://bugs.python.org/issue7681
FYI there is already some feedback in the tracker.
Yeah, someone who had the bright idea that maybe
* Terry Reedy:
On 1/12/2010 6:31 PM, Alf P. Steinbach wrote:
Perhaps change to CAPTCHA instead of mail confirmation.
I disagree. The point of mail confirmation is not just to assure that a
human is registering, but that we have a valid email for responses to be
sent to. Many issues are
* Stefan Behnel:
Alf P. Steinbach, 13.01.2010 06:39:
* Steven D'Aprano:
On Tue, 12 Jan 2010 23:42:28 +0100, Alf P. Steinbach wrote:
It is hopeless, especially for a newbie, to create correct Python
2.x+3.x compatible code, except totally trivial stuff of course.
So you allege, but
* Stefan Behnel:
Alf P. Steinbach, 13.01.2010 06:55:
* Steven D'Aprano:
I think you need to chill out and stop treating a simple bug report
as a personal slight on you.
I'm sorry but you're again trying to make people believe something
that you know is false, which is common
gs to anyone (or
nearly), I'd like the text on that page to still fit on one page. :-)
Cheers,
- Alf
--
http://mail.python.org/mailman/listinfo/python-list
* Steven D'Aprano:
On Wed, 13 Jan 2010 06:55:27 +0100, Alf P. Steinbach wrote:
* Steven D'Aprano:
On Tue, 12 Jan 2010 23:47:31 +0100, Alf P. Steinbach wrote:
PS: Next time it would have helped to include a URL to the issue.
http://bugs.python.org/issue7681
FYI there
ies), rattling along the housetops,
and fiercely agitating the scanty flame of the lamps that struggled against the
darkness" -- but in my case, not 1st sentence but the 2nd and 3rd paragraphs!
Comments welcome.
Cheers,
- Alf
PS: Now more stuff added to ch 3 but I've not updated
* Steve Holden:
Alf P. Steinbach wrote:
* Steven D'Aprano:
Nobody is trying to understate the complexity of writing a large
application that supports both 2.6 and 3.x, or of taking an existing
library written for 2.5 and upgrading it to support 3.1. But the
magnitude of these tasks
* Alf P. Steinbach:
* Steve Holden:
Alf P. Steinbach wrote:
* Steven D'Aprano:
Nobody is trying to understate the complexity of writing a large
application that supports both 2.6 and 3.x, or of taking an existing
library written for 2.5 and upgrading it to support 3.1. But the
magnitu
python 3 and the first one with python 2. Statement (2) is about
porting, statement (1) is about something else.
Having said all that I actually seriously doubt (probably in agreement
with you) that Alf is able to write good and helpful material on the
relationship between python 2 and 3, porting
bytes ) )
self._bytes[s] = bytes
self._pos = s.stop
else:
self._bytes.extend( bytes )
self._pos = len( self._bytes )
def flush( self ):
pass
def close( self ):
pass
Cheers & enjoy,
- Alf
PS: Comments welcome, except the BytesCollector which I just hacked together to
test something, it may contain eroRs but worked for my purpose.
--
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* version information in some kind of 'database', which might be a
separate file or simply hardcoded in your dummy startup program.
But I think personally I'd go for filename extensions and using 'assoc' and
'ftype', because while ugly it's simplest,
* Steve Holden:
Alf P. Steinbach wrote:
Just as a contribution, since someone hinted that I haven't really
contributed much to the Python community.
The [simple_sound] code will probably go into my ch 3 at http://tinyurl.com/programmingbookP3>, but sans sine wave generation
since I hav
aven't used *nix, if that's your environment, since mid 1990's...
Cheers & hth.,
- Alf
--
http://mail.python.org/mailman/listinfo/python-list
* Steve Holden:
Alf P. Steinbach wrote:
* Steve Holden:
Alf P. Steinbach wrote:
Just as a contribution, since someone hinted that I haven't really
contributed much to the Python community.
The [simple_sound] code will probably go into my ch 3 at http://tinyurl.com/programmingbookP3&
* Lie Ryan -> Alf P. Steinbach:
why do you think it is "impossible" to write a complex and portable
python script?
I don't. You're not quoting me.
Though keeping everything in one code base may often be difficult and
only of little practical benefit, it is not imp
* Mel:
Alf P. Steinbach wrote:
* Steve Holden:
It's not clear to me that you can approximate any waveform with a
suitable combination of square waves,
Oh. It's simple to prove. At least conceptually! :-)
Consider first that you need an infinite number of sine waves to create
* Steve Holden:
Alf P. Steinbach wrote:
* Steve Holden:
[...]
With the goal of just a rough approximation you can go about it like this:
1. Divide a full cycle of the sine wave into n intervals. With
sine wave frequency f this corresponds to n*f sample rate for digital
* Peter Otten:
Alf P. Steinbach wrote:
Just as a contribution, since someone hinted that I haven't really
contributed much to the Python community.
The [simple_sound] code will probably go into my ch 3 at http://tinyurl.com/programmingbookP3>, but sans sine wave generation since
I hav
* Grant Edwards:
On 2010-01-14, Alf P. Steinbach wrote:
It's not clear to me that you can approximate any waveform
with a suitable combination of square waves,
Oh. It's simple to prove. At least conceptually! :-)
[...]
With the goal of just a rough approximation you can go abo
* Steve Holden:
Grant Edwards wrote:
On 2010-01-14, Alf P. Steinbach wrote:
[bogus hand-waving]
After all, it's the basis of digital representation of sound!
Huh? I've only studied basic DSP, but I've never heard/seen
that as the basis of digital represention of sound.
* Steve Holden:
Alf P. Steinbach wrote:
* Steve Holden:
Grant Edwards wrote:
On 2010-01-14, Alf P. Steinbach wrote:
[bogus hand-waving]
After all, it's the basis of digital representation of sound!
Huh? I've only studied basic DSP, but I've never heard/seen
that as the b
* Lie Ryan:
On 01/15/10 05:42, Alf P. Steinbach wrote:
I'm beginning to believe that you maybe didn't grok that simple procedure.
It's very very very trivial, so maybe you were looking for something
more intricate -- they used to say, in the old days, "hold on, this
proof
* Lie Ryan:
On 01/15/10 05:42, Alf P. Steinbach wrote:
I'm beginning to believe that you maybe didn't grok that simple procedure.
It's very very very trivial, so maybe you were looking for something
more intricate -- they used to say, in the old days, "hold on, this
proof
* Steve Holden:
Alf P. Steinbach wrote:
* Lie Ryan:
On 01/15/10 05:42, Alf P. Steinbach wrote:
I'm beginning to believe that you maybe didn't grok that simple
procedure.
It's very very very trivial, so maybe you were looking for something
more intricate -- they used to say,
* Steve Holden:
Alf P. Steinbach wrote:
[...]
Perhaps you'd also admit to being wrong, and retract your innuoendo etc.?
Disregarding any matters of right or wrong (for this post, at least), I
herebe retract anything I have said about you that you consider
innuendo.
OK.
Feel fr
* Steven D'Aprano:
On Fri, 15 Jan 2010 05:23:48 +0100, Alf P. Steinbach wrote:
You're again into innuendo, misleading statements and so forth.
[...]
[Steve Holden] prefers to spout innuendu, personal attacks and
misleading statements.
Your constant and repeated accusation
* Ben Finney:
"Alf P. Steinbach" writes:
You did lie, that's established. In addition as I recall in the same
post you went on about my motivations for doing the Terrible Deed that
you invented.
None of that matches my (largely disinterested) observations. This is
pure fan
* Steve Holden:
Alf P. Steinbach wrote:
* Ben Finney:
"Alf P. Steinbach" writes:
You did lie, that's established. In addition as I recall in the same
post you went on about my motivations for doing the Terrible Deed that
you invented.
None of that matches my (largel
ed direct way, just dividing the current product by the number
removed from the collection, is then invalid. And some people might take that
limited applicability of the direct simple way as evidence that it's impossible
to remove numbers, failing to see any of the trivial practical soluti
ed to this thread, and that
it works, and that besides the algorithm is trivial so that "claim" is a rather
meaningless word here), read the article that you then responded to.
Cheers & hth.,
- Alf
--
http://mail.python.org/mailman/listinfo/python-list
one who thought that /including/ the word "invalid"
was the way to do it.
Cheers, just my 3 øre,
- Alf
PS: in the same way, not including "OT" in the subject line here might be
considered rude. But then, if I were to add it, some newsreader might split the
thread. So it
be quoted.
// Note: in order to handle Unicode paths needs to use Windows API command line.
//
// If this code works then it was written (but not tested) by Alf P. Steinbach.
// Otherwise it's someone impersonating me.
#include// std::wstring
#include// std::vector
* Steve Holden:
Alf P. Steinbach wrote:
* Grant Edwards:
On 2010-01-15, Steve Holden wrote:
I will, however, observe that your definition of a square wave is what I
would have to call a "'square' wave" (and would prefer to call a "pulse
train"), as I envisa
* Alf P. Steinbach:
* Steve Holden:
Though for what it's worth I wasn't impressed by the results of running
the posted program, since it yielded an AIFF file of mostly zeroes that
produced no audible sound.
$ od -bc sinewave.aiff
000 106 117 122 115 000 002 261 076 101 111 1
* Gertjan Klein:
Alf P. Steinbach wrote:
* Gertjan Klein:
What I've been thinking about is to write a single [Windows] executable that
gets associated with .py and .pyw (instead of python.exe itself).
Well, you need two: one for console subsystem, and one for GUI subsystem.
Why? I&#
* Gertjan Klein:
Alf P. Steinbach wrote:
* Gertjan Klein:
Alf P. Steinbach wrote:
Thinking about it some more, perhaps that way I can't get at return
codes a python script might provide. I haven't used those, but they may
be useful at some point.
Return codes work OK no matter wha
* Steve Holden:
Alf P. Steinbach wrote:
* Steve Holden:
Alf P. Steinbach wrote:
* Grant Edwards:
On 2010-01-15, Steve Holden wrote:
I will, however, observe that your definition of a square wave is
what I
would have to call a "'square' wave" (and would prefer to call
* Alf P. Steinbach:
* Steve Holden:
Alf P. Steinbach wrote:
* Steve Holden:
Alf P. Steinbach wrote:
* Grant Edwards:
On 2010-01-15, Steve Holden wrote:
I will, however, observe that your definition of a square wave is
what I
would have to call a "'square' wave" (and
* Alf P. Steinbach:
Just as a contribution, ...
The original code I posted was only written for Python 3.1.1 (because the code
was for my writings which assumes 3.x). In the simple_sound module this caused a
deprecation warning with 2.x. And the example program didn't work with 2.x.
followed right after some discussion we had.
Thus my impression of you or or responses in this group was colored by a false
interpretation. But, checking, which is often a good idea!, and *which I should
have done then*, as far as I can see the term was first used in this group in
April 2001, http://groups.google.com/group/comp.lang.python/browse_thread/thread/12a125ceddd401e2/c021547a1dc14a41>.
It's still a mystery to me what it refers to, though... :-)
Cheers & hth.,
- Alf
--
http://mail.python.org/mailman/listinfo/python-list
Save as current ...
b) If there's already a PYTHONPATH, Edit it, adding a semi-colon and
the full path of folder Module to the end.
5) Put your module folders into the folder Module.
6) (Here's a r
me that code?
join() always returns None.
But you can store the code in the thread object, and then access it after the
join().
Cheers & hth.,
- Alf
--
http://mail.python.org/mailman/listinfo/python-list
'o' then you can
write 'o["menu"]' or 'o.cget( "menu" )' to get at that logical attribute. And
tkinter Menu has various methods that you can use to inspect or update the menu;
see http://effbot.org/tkinterbook/menu.htm>. Disclaimer: I have
t by transforming it
to equivalent code and putting the target expressions innermost there.
And so the main factor causing a slowdown for a list comprehension would, I
think, be paging and such if the list it produced was Really Huge, while for the
generator there's no memory issue but rather much calling & context shifting.
Cheers & hth.,
- Alf
--
http://mail.python.org/mailman/listinfo/python-list
ps()
('1', '2', '3')
>>> type( m.groups() )
>>> dir( m )
['__copy__', '__deepcopy__', 'end', 'expand', 'group', 'groupdict', 'groups',
'span', 'start']
>>> m.groupdict
>>> m.groupdict()
{'one': '1', 'three': '3', 'two': '2'}
>>> print( tuple( m.groupdict().keys() ) )
('one', 'three', 'two')
>>> _
Cheers & hth.,
- Alf
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then it can do that (since I've implemented that). But I
don't know for a fact that it's practical to do so in Python. In order to use
the space the implementation must know that there's only one reference to the
string. And I don't know whether that information is readily available in a
CPython implementation (say), although I suspect that it is.
Cheers,
- Alf
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* Steven D'Aprano:
On Wed, 20 Jan 2010 05:25:22 +0100, Alf P. Steinbach wrote:
* Steven D'Aprano:
On Tue, 19 Jan 2010 16:20:42 -0500, Gerald Britton wrote:
That's surprising. I wouldn't implement it that way at all. I'd use a
dynamically-expanding buffer as I sugge
whatever the background of the newbie, do introduce turtle
graphics right away.
The ch 2 of the above reference contains some t.g. examples that you might use
(initial silly figures, graphs of functions, recursive figures). It doesn't go
into the turtle module objects. But if objects are what you want to show right
away, then I think the turtle module is great also for that, because those
objects are simple and can be easily explored.
Cheers & hth.,
- Alf
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* Alf P. Steinbach:
* Robert P. J. Day:
still working my way through "dive into python 3" and i've already
been asked to give a newbie tutorial on it -- blind leading the blind,
as it were. that should be hilarious.
i'll be using python 3 and it occurred to me that it
hat Steven wants to apply bitlevel and/or arithmetic
operations for e.g. some custom cryptographic thing. The string that he uses as
example is not completely unlike a message digest.
Another possibility is custom serialization/deserialization.
But it would be nice to know what it's actually abou
all last):
File "", line 1, in
NameError: name 'up' is not defined
>>> _
Of course it's an abuse of the language. :-)
So I wouldn't recommend it, but it's perhaps worth having seen it.
Cheers & hth.,
- Alf
PS: I hope this was not a homework question.
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Huh? I guess you meant to reply to the OP, not me.
Cheers,
- Alf
* Javier Collado:
Hello,
I'd say that isn't totally incorrect to use strings instead of
symbols. Please note that in other programming languages symbols,
atoms and the like are in fact immutable strings, which is w
not difficult to do.
I provided an example in my answer to the OP (first reply in the thread).
However, it's IMHO an abuse of the language, not something that one should do.
Cheers & hth.,
- Alf
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* Stefan Behnel:
Alf P. Steinbach, 21.01.2010 09:30:
* Martin Drautzburg:
- to be able to call move(up)
- having the "up" symbol only in the context of the function call
So it should look something like this
... magic, magic ...
move(up)
... unmagic, unmagic ..
* Stefan Behnel:
Alf P. Steinbach, 21.01.2010 11:38:
* Carl Banks:
On Jan 20, 11:43 pm, Martin Drautzburg
[snip]
What I am really looking for is a way
- to be able to call move(up)
- having the "up" symbol only in the context of the function
call
Short answer is,
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