common data structures

[max(01)*]

hi!

i am reading "how to think like a computer scientist - learning with
python"... it semms like a good tutorial, but it shows a different
language heritage... in particular, in the chapter about linked lists.

the question is: why bothering building a linked list class when you
have a native list type in the first place? the same applies about
trees, which can naturally be encoded like lists, e.g.:
1
/ \
2 3 ---> [1, [2, [4, 5]], 3] maybe...
/ \
4 5

is it a teaching contrived example, a matter of performance or what else?

bye

max

[Marc 'BlackJack' Rintsch]

In <ZQ*********************@news3.tin.it>, max(01)* wrote:

the question is: why bothering building a linked list class when you
have a native list type in the first place?
To show how the native list type may be implemented. It's not BTW. And
of course it's a book to learn to think like a computer scientist in
general and not like a python programmer.
the same applies about
trees, which can naturally be encoded like lists, e.g.:
1
/ \
2 3 ---> [1, [2, [4, 5]], 3] maybe...
/ \
4 5

is it a teaching contrived example, a matter of performance or what else?

That's a quite simple example and usually you want not only the data
representation but operations on that tree like in-order tree walk and
similar things.

Ciao,
Marc 'BlackJack' Rintsch