[Tutor] Fwd: class to function

[Danny Yoo]

---------- Forwarded message ----------
From: *diliup gabadamudalige* <diliupg at gmail.com>
Date: Sunday, May 25, 2014
Subject: [Tutor] class to function
To: Danny Yoo <dyoo at hashcollision.org>


Is it wrong to say that  __init__() is to initialize all the conditions you
setupin the class? That's how i see it.
I give below the way I see a class and it's workings. Please Correct if any
mistakes.

Say you have a class for a Spaceship
Class Spaceship():

under the def __init__():
you set up all the details you want the spaceship to have. For example,
self.engine=100
self. guns=100
self.shield=250
self.life=5

self if the Spaceship which will be built using the details given under the
init in the Class Spaceship. So a class is a blu print to build the space
ship and the init function contains all the things the space ship will
contain.
Now when you want a ne space ship say a RED one
 you can call the class with
RedShip=Spaceship()
and you can now giv e a new character to the space ship. A colour! like this
RedShip.colour=Red
Now along with the
RedShip.enging=100
RedShip.guns=100
RedShip.shield=250
RedShip.life=5
the RedShip also has a NEW ATTRIBUTE. Colour.
RedShip.colour=Red

The def__init__() can also be setup so that you can give all the attributes
its values like this.
def__init__(power,bullets,energy,life)

RedShip.enging=power
RedShip.guns=bullets
RedShip.shield=energy
RedShip.life=life

this way each ship can have different attributes. But they are all
Spaceships.




On Mon, May 26, 2014 at 6:38 AM, Danny Yoo
<dyoo at hashcollision.org<javascript:_e(%7B%7D,'cvml','dyoo at hashcollision.org');>
> wrote:

> > i am trying to understand this code:
> > http://nbviewer.ipython.org/gist/BenLangmead/6665861
>
> I'm slightly familiar with the purpose of the code.  It's constructing
> a Suffix Tree, though not in linear time.
>
> Reading the code... ah.  I see.  This is enumerating through all
> suffixes, and building it by repeated insertion into a trie.
>
>     http://en.wikipedia.org/wiki/Trie
>
> The classes are used here to represent structured data and operations
> to be performed on that structured data.  The code fundamentally has a
> structured value called a Node, with two fields to represent the
> string label and the links to other nodes.
>
>
>
> Aside: there is a very good book by Dan Gusfield that talks about
> suffix trees and how to construct them called "Algorithms on Strings,
> Trees and Sequences: Computer Science and Computational Biology"
>
>
> http://www.amazon.com/Algorithms-Strings-Trees-Sequences-Computational/dp/0521585198
>
> which you may want to look at if you're interested in these algorithms.
>
>
> It is probably not a good idea to try to intermix trying to understand
> an algorithm like this at the same time as you're learning basic
> features in your programming language.  Consider a slightly simpler
> example to learn about "classes", apart from the algorithms you are
> studying.  Most good Python tutorials should cover how to use classes
> to build structured data and manipulate it.  Alan Gauld's Python
> tutorial, for example, should have a section on this.
>
>     http://www.alan-g.me.uk/tutor/tutclass.htm
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-- 
Diliup Gabadamudalige

http://www.diliupg.com
http://soft.diliupg.com/

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