On 2011-11-01 06:31, Rinu Boney wrote:
def add_book(b): fo=open('books.dat','wb') pickle.dump(b,fo) fo.close()The Display After Unpickling Shows only the last Class Instance. How To Display All The Data In The File ?
You haven't shown us the complete program (how to you call "add_book" and "display_books"?) but I guess that you call "add_book" with one instance (if not, you can ignore the rest). In that case there is no more data in the file.
In your "add_book" function you open the file "books.at" and just save one instance. The next time you call the function with another instance you overwrite the former, because opening the same file with the parameter "w" (or in your case "wb") deletes any already existing content.
What you probably want is to put all the instances into a list and save this list. When you later read the file, you'll get the list back and you can iterate over it for displaying.
Bye, Andreas _______________________________________________ Tutor maillist - [email protected] To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
