On 9/28/10, Dave Angel wrote:
>
>
> On 2:59 PM, Alex Hall wrote:
>> On 9/28/10, Steven D'Aprano wrote:
>>>
>>>
>>> PyPy is a version of Python written in Python. It has an incredible
>>> mission: to eventually produce versions of Python which are faster than
>>> pure C, despite being written in
On 2:59 PM, Alex Hall wrote:
On 9/28/10, Steven D'Aprano wrote:
PyPy is a version of Python written in Python. It has an incredible
mission: to eventually produce versions of Python which are faster than
pure C, despite being written in Python itself. Although they have a
long, long way to
On 9/28/10, Steven D'Aprano wrote:
> On Tue, 28 Sep 2010 11:56:33 am Alex Hall wrote:
>> > (But don't forget that Python is not necessarily written in C.
>> > There's Jython, written in Java, and CLPython written in Lisp, and
>> > many others. How they implement objects may be different. What
>> >
On Tue, 28 Sep 2010 11:56:33 am Alex Hall wrote:
> > (But don't forget that Python is not necessarily written in C.
> > There's Jython, written in Java, and CLPython written in Lisp, and
> > many others. How they implement objects may be different. What
> > happens under the hood isn't important, s
On 9/27/10, Steven D'Aprano wrote:
> On Tue, 28 Sep 2010 06:00:41 am Alex Hall wrote:
>> > [ [0]*3 ]*4 behaves the same way. There's no problem in the inner
>> > list, but the outer list doesn't make four copies of [0,0,0], it
>> > has *one* list repeated four times. Modify one, modify them all.
>
On Tue, 28 Sep 2010 06:00:41 am Alex Hall wrote:
> > [ [0]*3 ]*4 behaves the same way. There's no problem in the inner
> > list, but the outer list doesn't make four copies of [0,0,0], it
> > has *one* list repeated four times. Modify one, modify them all.
>
> That makes sense. Basically, the * ope
On 9/27/10, Sander Sweers wrote:
> On 27 September 2010 23:15, Sander Sweers wrote:
>>> objects: copying the memory location, not making a deep copy and
>>> getting a duplicate object.
>>
>> It does not copy the object it makes multiple _references_ to the *same*
>> object.
>
> Oops, You already
On 27 September 2010 23:15, Sander Sweers wrote:
>> objects: copying the memory location, not making a deep copy and
>> getting a duplicate object.
>
> It does not copy the object it makes multiple _references_ to the *same*
> object.
Oops, You already got the idea and I should have read better.
On 27 September 2010 22:00, Alex Hall wrote:
> That makes sense. Basically, the * operator in this case acts as a
> copying command. For simple data types this is fine, but throw in a
> complex type, in this case a list (though I expect that any object
> would do this) and you are just doing what
On 9/27/10, Steven D'Aprano wrote:
> On Tue, 28 Sep 2010 03:54:55 am Alex Hall wrote:
>> Hi again everyone,
>> I have a 2d array (I guess it is technically a list) which I want to
>> fill with zeros. Later I will change some values, but any I do not
>> change have to be zeros. I have two complex f
Am 27.09.2010 20:29, schrieb Steven D'Aprano:
On Tue, 28 Sep 2010 03:54:55 am Alex Hall wrote:
Hi again everyone,
I have a 2d array (I guess it is technically a list) which I want to
fill with zeros. Later I will change some values, but any I do not
change have to be zeros. I have two complex fo
On 9/27/2010 10:54 AM Alex Hall said...
What is wrong with the following line?
self.am=[[(a,b)
for a in range(len(self.lines)) a=0]
for b in range(len(self.lines)) b=0]
The a=0 and b=0 -- what do you think they're doing?
Emile
___
Tutor maill
On Tue, 28 Sep 2010 03:54:55 am Alex Hall wrote:
> Hi again everyone,
> I have a 2d array (I guess it is technically a list) which I want to
> fill with zeros. Later I will change some values, but any I do not
> change have to be zeros. I have two complex for loops, but I tried to
> scale things do
On Mon, Sep 27, 2010 at 1:54 PM, Alex Hall wrote:
> Hi again everyone,
> I have a 2d array (I guess it is technically a list) which I want to
> fill with zeros. Later I will change some values, but any I do not
> change have to be zeros. I have two complex for loops, but I tried to
> scale things
Hi again everyone,
I have a 2d array (I guess it is technically a list) which I want to
fill with zeros. Later I will change some values, but any I do not
change have to be zeros. I have two complex for loops, but I tried to
scale things down to a couple list comprehensions and I broke things.
What
15 matches
Mail list logo
