On Sun, 10 Oct 2010 18:36:27 -0700, Ethan Furman wrote:
[snip]
>
> My question is more along the lines of: a mutable object was passed in
> to func()... what style of loop could be used to turn that one object
> into /n/ distinct objects? A list comp won't do it, but neither will a
> for loop,
Peter Pearson wrote:
On Sat, 09 Oct 2010 19:30:16 -0700, Ethan Furman wrote:
Steven D'Aprano wrote:
[snip]
But that doesn't mean that the list comp is the general purpose solution.
Consider the obvious use of the idiom:
def func(arg, count):
# Initialise the list.
L = [ar
Peter Pearson wrote:
On Sat, 09 Oct 2010 19:30:16 -0700, Ethan Furman wrote:
Steven D'Aprano wrote:
[snip]
But that doesn't mean that the list comp is the general purpose solution.
Consider the obvious use of the idiom:
def func(arg, count):
# Initialise the list.
L = [arg for i in
On Sat, 09 Oct 2010 19:30:16 -0700, Ethan Furman wrote:
> Steven D'Aprano wrote:
[snip]
>> But that doesn't mean that the list comp is the general purpose solution.
>> Consider the obvious use of the idiom:
>>
>> def func(arg, count):
>> # Initialise the list.
>> L = [arg for i in range(
Steven D'Aprano wrote:
And how often do you have an list that you are creating where you don't
know what items you have to initialise the list with?
[snip]
You are right to point out that the third case is a Python gotcha: [[]]*n
doesn't behave as expected by the naive or inexperienced Python
alex23 writes:
> If anything, I feel like the list comp version is the correct solution
> because of its reliability, whereas the multiplication form feels like
> either a lucky naive approach or relies on the reader to know the type
> of the initialising value and its mutability.
Other than lis
On Thu, 07 Oct 2010 18:34:58 -0700, alex23 wrote:
> On Oct 8, 10:27 am, Steven D'Aprano cybersource.com.au> wrote:
>> > v = [0 for i in range(20)]
>>
>> Absolutely not. Such a code snippet is very common, in fact I've done
>> it myself, but it is a "hammer solution" -- to a small boy with a
>
On Oct 7, 4:10 pm, Rogério Brito wrote:
[snip]
>
> v = [0 for i in range(20)]
>
> v = [0] * 20
>
> v = []
> for i in range(20): v.append(0)
>
> What should I prefer? Any other alternative?
The Pythonic way is to not to preinitialize the list at all. Don't
put anything in the list
On Thu, 7 Oct 2010 18:34:58 -0700 (PDT) alex23
wrote:
> On Oct 8, 10:27 am, Steven D'Aprano cybersource.com.au> wrote:
> > > v = [0 for i in range(20)]
> >
> > Absolutely not. Such a code snippet is very common, in fact I've
> > done it myself, but it is a "hammer solution" -- to a small boy
On Oct 7, 7:10 pm, Rogério Brito wrote:
> Hi there.
>
> I am used to some languages like C, but I am just a complete newbie with
> Python
> and, while writing some small snippets, I had encountered some problems, with
> which I would sincerely appreciate any help, since I appreciate this language
On Oct 8, 10:27 am, Steven D'Aprano wrote:
> > v = [0 for i in range(20)]
>
> Absolutely not. Such a code snippet is very common, in fact I've done it
> myself, but it is a "hammer solution" -- to a small boy with a hammer,
> everything looks like a nail that needs hammering. Writing such a li
On Oct 7, 6:10 pm, Rogério Brito wrote:
> Hi there.
>
> I am used to some languages like C, but I am just a complete newbie with
> Python
> and, while writing some small snippets, I had encountered some problems, with
> which I would sincerely appreciate any help, since I appreciate this language
On 10/8/2010 10:15 AM Grant Edwards said...
Damn. I should give up and go golfing.
+1 QOTW
Emile
--
http://mail.python.org/mailman/listinfo/python-list
On 2010-10-08, Grant Edwards wrote:
> On 2010-10-08, Grant Edwards wrote:
>> On 2010-10-07, Rog??rio Brito wrote:
>>
>>> If possible, I would like to simply declare the list and fill it
>>> latter in my program, as lazily as possible (this happens notoriously
>>> when one is using a technique of
On 2010-10-08, Grant Edwards wrote:
> On 2010-10-07, Rog??rio Brito wrote:
>
>> If possible, I would like to simply declare the list and fill it
>> latter in my program, as lazily as possible (this happens notoriously
>> when one is using a technique of programming called dynamic
>> programming w
On 2010-10-07, Rog??rio Brito wrote:
> If possible, I would like to simply declare the list and fill it
> latter in my program, as lazily as possible (this happens notoriously
> when one is using a technique of programming called dynamic
> programming where initializing all positions of a table m
On 2010-10-08, BartC wrote:
> "Rogério Brito" wrote in message
> news:i8lk0n$g3...@speranza.aioe.org...
>> If possible, I would like to simply declare the list and fill it latter in
>> my
>> program, as lazily as possible (this happens notoriously when one is using
>> a
>> technique of program
"Rogério Brito" wrote in message
news:i8lk0n$g3...@speranza.aioe.org...
My first try to write it in Python was something like this:
v = []
for i in range(20):
v[i] = 0
Unfortunately, this doesn't work, as I get an index out of bounds when
trying to
index the v list.
Python can't grow
Rogério Brito wrote:
class C:
f = 1
def g(self):
return f
I get an annoying message when I try to call the g method in an object of type
C, telling me that there's no global symbol called f. If I make g return self.f
instead, things work as expected, but the code loses some reada
On Thu, 07 Oct 2010 20:10:14 -0300, Rogério Brito wrote:
> What is the Pythonic way of writing code like this? So far, I have
> found many alternatives and I would like to write code that others in
> the Python community would find natural to read. Some of the things
> that crossed my mind:
>
>
On 2010-10-07, Rogério Brito wrote:
> 1 - The first issue that I am having is that I don't seem to be able to, say,
> use something that would be common for people writing programs in C: defining
> a
> one-dimensional vector and only initializing it when needed.
>
> For instance, in C, I would wr
On Fri, 08 Oct 2010 00:46:41 +0100 MRAB
wrote:
> In other words, don't try to write a C program in Python!
Man, I'm good. :D
/W
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country. But if you spam me, I'll be one sour kraut.
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On Thu, 07 Oct 2010 20:10:14 -0300 Rogério Brito
wrote:
> I am used to some languages like C, but I am just a complete newbie
> with Python and, while writing some small snippets, I had encountered
> some problems, with which I would sincerely appreciate any help,
> since I appreciate this langua
On 08/10/2010 00:10, Rogério Brito wrote:
Hi there.
I am used to some languages like C, but I am just a complete newbie with Python
and, while writing some small snippets, I had encountered some problems, with
which I would sincerely appreciate any help, since I appreciate this language to
write
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