Many newbie questions regarding python

Grant Edwards invalid at invalid.invalid
Fri Oct 8 19:04:51 CEST 2010


On 2010-10-07, Rog??rio Brito <rbrito at ime.usp.br> wrote:

> If possible, I would like to simply declare the list and fill it
> latter in my program, as lazily as possible (this happens notoriously
> when one is using a technique of programming called dynamic
> programming where initializing all positions of a table may take too
> much time in comparison to the filling of the array).

At first you say you want a list, later you say you want an array.
They're two different things.  Arrays are variable-length and can be
heterogeneous. If what you really want is a fixed-length, homogeneous
array, then use an array instead of a list:

http://docs.python.org/library/array.html

> If I declare a class with some member variables, is is strictly
> necessary for me to qualify those members in a method in that class?

Yes.

> I get an annoying message when I try to call the g method in an
> object of type C, telling me that there's no global symbol called f.
> If I make g return self.f instead, things work as expected, but the
> code loses some readability.

That's a matter of opinion.  Some of us _like_ self.f since it
explicitly shows the reader that f isn't a global or local but a class
or instance variable.  Any time you make the reader/maintainer guess
what something is, that's a bug waiting to happen.

> Is there any way around this or is that simply "a matter of life"?

Well, that's how Python works.  I won't comment on "life".

-- 
Grant Edwards               grant.b.edwards        Yow! I feel like a wet
                                  at               parking meter on Darvon!
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