Ok, I'm quite new to Python

[Bengt Richter]

On Wed, 13 Oct 2004 00:03:41 +0000 (UTC), "Michael" <slick_mick_00 at hotmail.com> wrote:

>But i'm a good c++ programmer.
>
>What i want to do is parse a text file and store the information in relevant
                      ^^^^^^^^^^^^^^^^^[1]  ^^^^^[2]  ^^^^^^^^^^^[3] ^^^^^^^^-
>fields:
 -^^^^^[4]
[1] ok
[2] where?
[3] which
[4] relevant to what?
[5] ;-)
>
>//Text File:
>
>*Version 200
>*SCENE {
>    AMBIENT_COLOUR    0.0 0.0 0.0
>                }
>
>*MATERIAL_LIST{
>    *MATERIAL_COUNT 0
>    }
>*GEOMOBJECT {
>    *NODE_NAME "obj1"
>    *MESH {
>        *MESH_VERTEX_LIST{
>            *MESH_VERTEX    0    0 0 0
>            *MESH_VERTEX    1    0 1 2
>                        }
>        *MESH_FACE_LIST {
>            *MESH_FACE    1    2    3
>                        }
>                    }
>        }
>/* ... More GEOMOBJECTS ...*/
>
>
>but I have no idea what the best way to do this is?
                                         ^^^^^^^[1]
[1] do what?
>Any thoughts??
>
Id probably start eith stripping out the tokens with a regular expression
and then process the list to build a tree that you can then walk? To start:

 >>> data = """\
 ... *Version 200
 ... *SCENE {
 ...     AMBIENT_COLOUR    0.0 0.0 0.0
 ...                 }
 ...
 ... *MATERIAL_LIST{
 ...     *MATERIAL_COUNT 0
 ...     }
 ... *GEOMOBJECT {
 ...     *NODE_NAME "obj1"
 ...     *MESH {
 ...         *MESH_VERTEX_LIST{
 ...             *MESH_VERTEX    0    0 0 0
 ...             *MESH_VERTEX    1    0 1 2
 ...                         }
 ...         *MESH_FACE_LIST {
 ...             *MESH_FACE    1    2    3
 ...                         }
 ...                     }
 ...         }
 ... """

 >>> import re
 >>> rxs = re.compile(r'([{}]|"[^"]*"|[*A-Z_a-z]+|[0-9.]+)')
 >>> tokens = rxs.findall(data)
 >>> tokens
 ['*Version', '200', '*SCENE', '{', 'AMBIENT_COLOUR', '0.0', '0.0', '0.0', '}', '*MATERIAL_LIST',
  '{', '*MATERIAL_COUNT', '0', '}', '*GEOMOBJECT', '{', '*NODE_NAME', '"obj1"', '*MESH', '{', '*M
 ESH_VERTEX_LIST', '{', '*MESH_VERTEX', '0', '0', '0', '0', '*MESH_VERTEX', '1', '0', '1', '2', '
 }', '*MESH_FACE_LIST', '{', '*MESH_FACE', '1', '2', '3', '}', '}', '}']

IWT that isolates the basic info of interest. It should not be hard to make a tree or
extract what suits your purposes, but I'm not going to guess what those are ;-)

Regards,
Bengt Richter