bruno at modulix <[EMAIL PROTECTED]> writes:
> I should just take some time and learn to read !-)
Then I am better of than you. I just had to learn the syntax of a
language :-)
--
Brian (remove the sport for mail)
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Steven D'Aprano wrote:
> On Thu, 09 Mar 2006 13:44:25 +0100, bruno at modulix wrote:
>
>
(snip)
>>And it's not "self-referential" - it introduces a references cycle
>>(class object -> instances -> class object), which may or may not be a
>>problem.
>
>
> Every instance knows about a list of ev
Steven D'Aprano <[EMAIL PROTECTED]> writes:
> With this method in the class, your solution is easier than ever:
Nice solution.
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Brian (remove the sport for mail)
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Michael <[EMAIL PROTECTED]> writes:
> Based on the code that runs, you want* this:
>
> [(y[x+1].x-y[x].x) for x in range(len(y)-1) ]
Yes.
> Since personally I find that a lot clearer than:
>
> map(float.__sub__, [X.x for X in y[1:]], [X.x for X in y[:-1] ])
Me too.
--
Brian (remove the sport
On Thu, 09 Mar 2006 13:44:25 +0100, bruno at modulix wrote:
> Steven D'Aprano wrote:
> (snip)
>
>> I say "think you want" because I don't know what problem you are trying to
>> solve with this messy, self-referential, piece of code.
>
> This messy piece of code is mine, thanks !-)
You're welcom
On Thu, 09 Mar 2006 13:23:22 +0100, Brian Elmegaard wrote:
> Steven D'Aprano <[EMAIL PROTECTED]> writes:
>
>> Can you explain more carefully what you are trying to do? If you want the
>> square of the maximum value, just do this:
>
> I want to get the value of another attribute of the instance w
Brian Elmegaard wrote:
...
> The code that runs:
>
> class Foo:
> def __init__(self,x):
> self.x=x
>
> y=[]
> y.append(Foo(10.0))
> y.append(Foo(110.0))
> y.append(Foo(60.0))
>
> ys=[]
> y_max=0.0
> y_min=0.0
>
> for s in y:
> ys.extend([s.x])
> y_max=max(s.x,y_max)
> y_
bruno at modulix <[EMAIL PROTECTED]> writes:
> May I suggest that you first learn the language syntax and basics ?-)
I'll try
--
Brian (remove the sport for mail)
http://www.et.web.mek.dtu.dk/Staff/be/be.html
http://www.rugbyklubben-speed.dk
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Brian Elmegaard wrote:
> bruno at modulix <[EMAIL PROTECTED]> writes:
>
>
>>So it's time to move to 2.4x !-)
>
>
> I guess so.
>
>
>
>>What is "going wrong" exactly ?
>
>
> def _add_instance(cls, instance):
> _add_instance=classmethod(_add_instance)
> cls._instances.append(in
Steven D'Aprano wrote:
(snip)
> I say "think you want" because I don't know what problem you are trying to
> solve with this messy, self-referential, piece of code.
This messy piece of code is mine, thanks !-)
And it's not "self-referential" - it introduces a references cycle
(class object -> in
Steven D'Aprano <[EMAIL PROTECTED]> writes:
> What you probably think you want is something like this:
Thanks, that made it run.
Now I need to study what classmethods are.
> I say "think you want" because I don't know what problem you are trying to
> solve with this messy, self-referential, piec
Steven D'Aprano <[EMAIL PROTECTED]> writes:
> Can you explain more carefully what you are trying to do? If you want the
> square of the maximum value, just do this:
I want to get the value of another attribute of the instance with
maximum x.
I know I could do it like you suggest for the case wi
On Thu, 09 Mar 2006 11:54:11 +0100, Brian Elmegaard wrote:
>> What is "going wrong" exactly ?
>
> def _add_instance(cls, instance):
> _add_instance=classmethod(_add_instance)
> cls._instances.append(instance)
>
> gives me:
> d:/DTU/80494 $ python.exe ooo.py
> Traceback (most recen
On Thu, 09 Mar 2006 12:24:05 +0100, Brian Elmegaard wrote:
> James Stroud <[EMAIL PROTECTED]> writes:
>
>> You should look into __cmp__ and other magic methods. This is probably
>> the type of functionality you seem to be after.
>
> Good example, I need to look at the magic methods.
> What I wan
James Stroud <[EMAIL PROTECTED]> writes:
> You should look into __cmp__ and other magic methods. This is probably
> the type of functionality you seem to be after.
Good example, I need to look at the magic methods.
What I want is to get the value of another variable in C. Would I need to
use __re
bruno at modulix <[EMAIL PROTECTED]> writes:
> So it's time to move to 2.4x !-)
I guess so.
> What is "going wrong" exactly ?
def _add_instance(cls, instance):
_add_instance=classmethod(_add_instance)
cls._instances.append(instance)
gives me:
d:/DTU/80494 $ python.exe ooo.py
Tr
Brian Elmegaard wrote:
> bruno at modulix <[EMAIL PROTECTED]> writes:
>
>
>>Now how you could do it the OO way (Q&D, not really tested):
>
>
> Something goes wrong in my 2.3
So it's time to move to 2.4x !-)
What is "going wrong" exactly ?
> when I change the syntax to
> _add_instance=classm
Max M wrote:
> decorated = [(obj.x, obj) for obj in objects]
> max_decorated = max(decorated)
> max_obj = max_decorated[-1]
Python 2.5 will make this even easier - max() and min() aquire a `key`
keyword parameter much like list.sort()/sorted().
max_obj = max(objects, key=operator.attrgetter(
Brian Elmegaard wrote:
> "Matt Hammond" <[EMAIL PROTECTED]> writes:
>
>
>>y_max = max([e.x for e in y])
>
>
> Would there be a way to refer back to the e with maximum x, or how
> could I find other attributes of it?
>
You should look into __cmp__ and other magic methods. This is probably
the
bruno at modulix <[EMAIL PROTECTED]> writes:
> Now how you could do it the OO way (Q&D, not really tested):
Something goes wrong in my 2.3 when I change the syntax to
_add_instance=classmethod(_add_instance).
If I understand this correctly the class is keeping track of the
instances of itself. T
"Matt Hammond" <[EMAIL PROTECTED]> writes:
> y_max = max([e.x for e in y])
Would there be a way to refer back to the e with maximum x, or how
could I find other attributes of it?
--
Brian (remove the sport for mail)
http://www.et.web.mek.dtu.dk/Staff/be/be.html
http://www.rugbyklubben-speed.dk
Brian Elmegaard wrote:
> Hi,
>
> I am struggling to understand how to really appreciate object
> orientation. I guess these are FAQ's but I have not been able to find
> the answers. Maybe my problem is that my style and understanding are
> influenced by matlab and fortran.
>
> I tried with the si
"Matt Hammond" <[EMAIL PROTECTED]> writes:
> Hmmm, rereading, I think you're right ... and I think I'm confused too :-)
You both are.
> Attempt #2:
>
> yz = [ (y1.x - y2.x) for (y1,y2) in zip(y[:-1], y[1:]) ]
>
> Frankly, a for loop with an index would probably be easier to read :)
Me too,
Steven D'Aprano <[EMAIL PROTECTED]> writes:
Thanks for the answers. They are very useful.
> self.args = (x, y, z) # save a copy of the arguments
As always python makes it easy.
max(obj.lister())
> 4
Actually I wanted to get the maximum of attributes of several
instances. List com
Brian Elmegaard wrote:
> "Matt Hammond" <[EMAIL PROTECTED]> writes:
>
>
>>y_max = max([e.x for e in y])
>
>
> Would there be a way to refer back to the e with maximum x, or how
> could I find other attributes of it?
In that case a common idiom is to "decorate"
decorated = [(obj.x, obj) for
Brian Elmegaard wrote:
> Hi,
>
> I am struggling to understand how to really appreciate object
> orientation. I guess these are FAQ's but I have not been able to find
> the answers. Maybe my problem is that my style and understanding are
> influenced by matlab and fortran.
> What I hoped I could
On Wed, 08 Mar 2006 11:29:29 -, Steven D'Aprano
<[EMAIL PROTECTED]> wrote:
> On Wed, 08 Mar 2006 11:00:09 +, Matt Hammond wrote:
>
>>> 4: Can I avoid the dummy counter i in the for loop and do something
>>> like:
>>> yz=[y[:-1].x-y[1:].x]
>>
>> yz = [e.x for e in y]
>> yz.reverse()
>
> I
"Matt Hammond" <[EMAIL PROTECTED]> writes:
> See "List comprehensions" in python docs:
Great, thanks for the hint.
--
Brian (remove the sport for mail)
http://www.et.web.mek.dtu.dk/Staff/be/be.html
http://www.rugbyklubben-speed.dk
--
http://mail.python.org/mailman/listinfo/python-list
On Wed, 08 Mar 2006 11:00:09 +, Matt Hammond wrote:
>> 4: Can I avoid the dummy counter i in the for loop and do something
>> like:
>> yz=[y[:-1].x-y[1:].x]
>
> yz = [e.x for e in y]
> yz.reverse()
I don't think that's what the O.P. actually wants. He seems to have
misused slicing syntax as
On Wed, 08 Mar 2006 11:04:41 +0100, Brian Elmegaard wrote:
> Hi,
>
> I am struggling to understand how to really appreciate object
> orientation. I guess these are FAQ's but I have not been able to find
> the answers. Maybe my problem is that my style and understanding are
> influenced by matlab
Hi,
> 3: Why canøt I say and get the maximum of instance attributes and a
> list of them?
> y_max=max(y[].x) and
> ys=[y[].x]
y_max = max([e.x for e in y])
See "List comprehensions" in python docs:
http://docs.python.org/tut/node7.html#SECTION00714
> 4: Can I avoid the dummy cou
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