On 02/11/2013 12:14 AM, neubyr wrote:
> I have a text file with each line in following format:
>
> Book Name, Author Name, Genre, Publication Date
>
> I would like to perform following queries on this file:
> * Get all books written by an author
> * Remove all books of an author
> * Get information about a book (pretty print matching line!)
> * Get books of particular genre
>
> Also, I would like to add and delete entries in this file. I am not
planning to use any database for this purpose and would like to get
better grasp on file parsing and classes/OOP. I need some help in
creating classes and following are my initial thoughts:
>
> # Create a class for Book object
> class Book:
> atributes: name, author_name, genre, publication-date
>
> # Create
> Author:
> attribute(s): name
>
> # Create class for reading and writing to the file
> class Booksfile:
> methods: ??
>
>
> * How do I associate/relate Book and Author classes so that it will
help me in getting information like 'get list of books written by an
author'? Data attribute?
> * Should I create a new Booksfile object for reading, writing and
deleting entries in the file OR add corresponding methods to the book
object itself?
>
> I am not planning to use SQLite or any database and would like to use
text file only. Appreciate any help on designing such application.
>
>
Book.author should be author instance,
Author
def books(self):
return [b for b in books if b.author==self]
Get lists by genre etc in a similar way.
To do file processing, look at the standard csv module:
http://docs.python.org/2/library/csv.html
-m
--
Lark's Tongue Guide to Python: http://lightbird.net/larks/
The doer alone learneth. Friedrich Nietzsche
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