Re: contacts, was: Re: [Gnumed-devel] DrugBrowser nicer piccie

[Karsten Hilbert]

On Thu, Feb 02, 2006 at 02:04:00PM +1100, Richard wrote:

> Postgres is only a moderate challenge, because SQL is the same wherever you 
> do 
> it, I've just got to get myhead around functions/rules/tiggers etc,
For the most part one can ignore rules for the time being.
They do have their place but aren't immediately useful as
often as triggers and functions.

> and it is 
> not the concepts around these, rather the syntax which trips me up.
Ah, I see.

> Python is somewhat different, not in its constructs such as the ifs, elses, 
> loops etc, but what I have huge difficulty getting my head around for some 
> reason is the classes contruct,
What part of that confuses you ?

> and when in use with wxPython, how the 
> 'parent', 'self', parameter stuff works.
Parent is the one-level-up window which owns the current
window (dialog, widget, etc).

Self is a reference to "myself", that is, to the instance of
the class at runtime.

Think of it as the blueprint for a car and one of the cars
built from it. In the blueprint (the class) there is a
picture of a button and the instructions say: "If this
button is pressed, light a fire." Now, this means that if
the button is pressed in the actual car (self) then the fire
should be lit in the *car* not in the blueprint. It seems
obvious but the computer needs to be told explicitely. So,
"self.something" sort of means "do something *later* in the
actual thing".

Karsten
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