I'm looking for objective oriented and pythonic way to solve my problem.
I'm using IDLE's TreeWidget, by inheriting TreeItem and overriding some of
it's methods. My tree structure is defined inside treedata, which is
xml.dom.minidom object. MenuTreeFrame is responsible for displaying the
widget
chris <[EMAIL PROTECTED]> wrote:
> I've been scripting with python for a while now. Basically writing a few
> functions and running in the ipython shell. That's been very useful. But the
> more I do this the more I see that I'm doing more or less the same thing
> over and over again. So its feels l
On Wednesday 20 July 2005 07:22 am, chris wrote:
> Also minor clarifications::
>
> > I'm hoping some of you python
> > lamas out there might be able to share some of your wisdom on the subject.
>
> lama = guru = teacher(not a furry animal, although my dog has certainly
> taught me a few trick
Extremely grateful for all the responses. I've pasted them all into a
document and can now read all your valuable ideas together. Even at a first
reading they have already helped clarify my thinking.
Also minor clarifications::
> I'm hoping some of you python
> lamas out there might be able to sh
Robert Kern wrote:
> chris wrote:
>
>> When I think about what I should do I end up with a class XY that has a
>> method for everything I want to do eg.
>>
>> class XY:
>> def read_file
>> def scale_data
>> def plot_data
>> def shelve_data
>>
>> But somehow that doesn't feel right, especia
On Tuesday 19 July 2005 05:09 am, chris wrote:
> So its feels like I need to get into class programming
> with all its attendant benefits. However my biggest problem is a conceptual
> one. I just can't get my head around defining suitable classes, how they
> aquire data and communicate with each o
I also have a little trouble with creating megaclasses. Usually I just
try to think about what things are a little bit, and how I'm going to
be using them. I think somebody else suggested a top down approach,
and that makes a certain amount of sense.
But at this point, you're probably getting ti
especially when I expect the number of
> methods will grow and grow, which would make the class very unwieldy.
I think that a key thing to remember, especially as you start learning
OO design, is to not succumb to analysis paralysis. If all you need
right now are those four methods, then impleme
Chris
> 1. get arbitrary numerical data (typically large data sets in columnar
> format or even via COM from other packages. I generally have to deal with
> one or more sets of X,Y data)
> 2. manipulate the data (scaling, least squares fitting, means, peaks,
> add/subtract one XY set from another
On 2005-07-19, chris <[EMAIL PROTECTED]> wrote:
> I've been scripting with python for a while now. Basically writing a few
> functions and running in the ipython shell. That's been very useful. But the
> more I do this the more I see that I'm doing more or less the same thing
> over and over again
fav DP books:
http://www.oreilly.com/catalog/hfdesignpat/
http://www.netobjectives.com/dpexplained/
--
http://mail.python.org/mailman/listinfo/python-list
> "chris" == chris <[EMAIL PROTECTED]> writes:
chris> I have no problem writing bits of functional code to do any
chris> of the above. But for the life of me I can't see how I can
chris> hook them altogether in an OO based framework that I can
chris> build and extend (with mo
I've been scripting with python for a while now. Basically writing a few
functions and running in the ipython shell. That's been very useful. But the
more I do this the more I see that I'm doing more or less the same thing
over and over again. So its feels like I need to get into class programming
[EMAIL PROTECTED] wrote:
> Dave Benjamin wrote:
>
>>I think it's much better for simplify() to return a new object
>>and leave the original object unmodified. You can still write:
>>expression2 = expression2.simplify()
>
> A belated thank-you message for your reply to my posting. I took your
> ad
Dave Benjamin wrote:
> [EMAIL PROTECTED] wrote:
> > Now suppose I set "expression2 = Sum([a,-a])" and Sum.simplify()
> > recognises that the two terms cancel and the Sum has value 0.
> >
> > Can I make "expression2.simplify()" transform expression2 from an
> > instance of Sum to an instance of Numb
[EMAIL PROTECTED] wrote:
> Now suppose I set "expression2 = Sum([a,-a])" and Sum.simplify()
> recognises that the two terms cancel and the Sum has value 0.
>
> Can I make "expression2.simplify()" transform expression2 from an
> instance of Sum to an instance of Number(0) **in place**? Is that
> po
Hello comp.lang.py,
Can you help me with ideas for the following (somewhat newbie) OO
design question in Python? Note, I'm using psuedo-code, not actual
Python for the examples!
Background:
---
I need to represent a small variety of mathematical constructs
symbolically using P
"Bengt Richter" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
>
> See if this does what you want:
>
> [snipped]
>
Yes, that's pretty much what I had in mind. I particularly liked the
idea of mirroring automagically the nested class inheritance in each
version. So I tried to refine th
George Sakkis <[EMAIL PROTECTED]> wrote:
>>A1 - A2 - A3 - A4 - ...
>>||||
>>B1 - B2 - + - B4 - ...
>>||||
>>C1 - + - C3 - + - ...
>>||||
>>D1 - D2 - + - D4 - ...
>>||||
>> The solution is simply to include C3 in th
On 9 Apr 2005 03:49:19 -0700, "George Sakkis" <[EMAIL PROTECTED]> wrote:
>"Michael Spencer" <[EMAIL PROTECTED]> wrote:
>>
>> George,
>>
>> since you explicit allowed metaprogramming hacks :-), how about
>something like
>> this (not tested beyond what you see):
>>
>> [snipped]
>>
>
>Nice try, but i
Dirk wrote:
> So I dug through the documentation and found that new-style classes
> compute a monotonic linearization of the inheritance graph, observing
>local precedence order, using the algorithm also used in Dylan
> described here:
>http://www.webcom.com/haahr/dylan/linearization-oopsla96.html
George Sakkis wrote:
Have you considered a 'macro' solution composing source?
Can you elaborate on this a little ? You mean something like a
template-based code generating script that creates all the boilerplate
code for each version before you start customising it ?
I was thinking more along the
Hi George,
it's a nice little puzzle and it is more fun to solve it if one is not
a student anymore :)
Filling the gaps in the lattice is somehow necessary but it is not
necessary to create all the classes.
Ansatz:
We can consider two matrices: one is filled with nodes ( class names )
the other
> Have you considered a 'macro' solution composing source? If I were
handling so
> many versions, I would want a complete class definition for each
version rather
> than having to scan many sources for each implementation.
Can you elaborate on this a little ? You mean something like a
template-ba
> On second thought, I had doubts. Consider the following scenario:
>
>A2 | f <- A3
>^ ^
>| |
>B2 | f <- B3
>^ ^
>| |
>C2 <- C3 | g
>
> Assume g calls f. Since f is defined in B version 2, it should taken
>
It may be useful to separate the code into version-independent part and
version-dependent part. Also, one can try to implement the higher-level
logic directly in the class definition of A, B, etc., and then use the
version objects only as patches for the details. That is, one can use
place-holder c
Dirk Thierbach <[EMAIL PROTECTED]> wrote:
> Ok. Multiple inheritance can often select priority for conflicting
> methods. If you can specify yhat tou want "column priority" for
> each class, you're fine.
On second thought, I had doubts. Consider the following scenario:
A2 | f <- A3
^
George Sakkis wrote:
Nice try, but ideally all boilerplate classes would rather be avoided
(at least being written explicitly).
It depends on how much magic you are prepared to accept; this goal is somewhat
in conflict with the next one...
Also, it is not obvious in your
solution why and which p
"Michael Spencer" <[EMAIL PROTECTED]> wrote:
>
> George,
>
> since you explicit allowed metaprogramming hacks :-), how about
something like
> this (not tested beyond what you see):
>
> [snipped]
>
Nice try, but ideally all boilerplate classes would rather be avoided
(at least being written explici
George Sakkis wrote:
I'm not sure if it was clear to you, but my problem is the dummy
WorldModel_v1.MovableObject class. It doesn't do anything by itself,
but it has to be in the inheritance chain to make its descendants work
properly.
George,
since you explicit allowed metaprogramming hacks :-),
George Sakkis <[EMAIL PROTECTED]> wrote:
> 1. There is a (single inheritance) hierarchy of domain classes, say
> A<-B<-..<-Z (arrows point to the parent in the inheritance tree).
> 2. This hierarchy evolved over time to different versions for each
> class. So for example, version's 1 hierarchy wou
>
I'm not sure if it was clear to you, but my problem is the dummy
WorldModel_v1.MovableObject class. It doesn't do anything by itself,
but it has to be in the inheritance chain to make its descendants work
properly.
> Are you using the *_v1 naming convention for backwards compatibility?
> Backw
On Fri, Apr 08, 2005 at 06:40:54PM -0700, George Sakkis wrote:
> > Err, you might want to explain what these things do instead of an
> > abstract description of how you are doing it. It looks like you are
> > using inheritance in the normal way _and_ you are using it to handle
> > versioning of so
> Err, you might want to explain what these things do instead of an
> abstract description of how you are doing it. It looks like you are
> using inheritance in the normal way _and_ you are using it to handle
> versioning of some kind (maybe stable interface releases? I don't
know).
>
> Let us kno
On Fri, Apr 08, 2005 at 04:42:52PM -0700, George Sakkis wrote:
> I'm looking for a design to a problem I came across, which goes like
> this (no, it's not homework):
>
> 1. There is a (single inheritance) hierarchy of domain classes, say
> A<-B<-..<-Z (arrows point to the parent in the inheritance
I'm looking for a design to a problem I came across, which goes like
this (no, it's not homework):
1. There is a (single inheritance) hierarchy of domain classes, say
A<-B<-..<-Z (arrows point to the parent in the inheritance tree).
2. This hierarchy evolved over time to different versions for eac
mep wrote:
Any free UML modelling tools that generate python code?
I've been working on Gaphor (htp://gaphor.sourceforge.net) for the past
few years.
Gaphor is an UML modeling tool written in Python. It is completely UML
2.0 compliant (in fact the data model is UML 2.0).
Gaphor has currently s
Any free UML modelling tools that generate python code?
--
Best Regards,
Wang Kebo
http://www.huihoo.org/~mep
"Paul McGuire" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> I just found out that my favorite UML modeling tool, Enterprise Architect,
> has just released a new vers
> "Paul" == Paul McGuire <[EMAIL PROTECTED]> writes:
Paul> I just found out that my favorite UML modeling tool,
Paul> Enterprise Architect, has just released a new version,
Paul> *with* Python code support. You can
...
Somewhat tangentially, but still on-topic for the subject li
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