[Tutor] Beginner Question

[Sven Hennig]

Thank you! You guys helped me out alot.

@Alan your website is great! Really clearly written. Especially the "Things
to remember" part.

If you have exercises for me or have a Website with exercises, bring it on. I
think this is the best way to learn.



2013/10/22 Dave Angel <davea at davea.name>

> On 22/10/2013 10:25, Sven Hennig wrote:
>
> >  Hello, I would like to learn a programming language and have decided to
> use
> > Python. I have some programming experience and doing well in Python. What
> > really causes me problems is OOP.
> > I'm just dont get it... I'm missing a really Practical example. In every
> > book I've read are the examples of such Class Dog and the function is
> bark. Has
> > anyone an OOP example for me as it is really used in real code, so I can
> > better understand the concept? I do not know why this is so hard for me.
> >
>
> What you may not realize is you're already doing OOP, just by using the
> standard library.  When you open a file (or many other things that can
> produce a stream of bytes), you get an instance of class file.  When you
> use that instance, you're calling methods of that instance.  So when you
> say:
>
> infile = open("myfile.txt,"r")
> data = infile.readline()
>
> you're doing object oriented programming.  You don't have to know what
> kind of thing "infile" is, you just have to know it has methods read(),
> readline(), close(), etc.
>
> When you want to write your own classes, or when you want to make a new
> class that's related but different from one of the thousands that are
> standard, that's when it gets interesting.  As Alan says, GUI is one
> place where you'll be wrting your own classes, usually by deriving from
> one of the GUI library classes.
>
> At its most fundamental, a class is a description of how to create and
> how to manipulate instances.  An instance has methods (functions), and
> attributes (data).  When one class is derived from another, it can share
> some or most of the attributes and behavior of the parent class, but
> make changes.  This helps avoid duplicating code when two things are
> similar.
>
> You're familiar with list and tuple.  Those are built-in
> collection classes, supported explicitly by the language. But if you
> want your own collection, you may want to make a class for it.  The Dog
> bark() example may seem silly, but a Dog has lots of other methods
> besides that one, and has lots of attributes (color, breed, health
> state, owner, etc.).  In a sense those attributes are like a list within
> the Dog, but you want them to have nice names, instead of remembering
> that the 3rd one is owner.
>
>
> --
> DaveA
>
>
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