[Tutor] Address book sort of

[Rick Muller]

Couldn't tell if this got sent, so I'm re-sending.
Apologies for duplicates:

Well, one option is to use pickle (or cPickle,
preferrably) to dump the python objects to a file:


from cPickle import load, dump

def save(fname,addressbook):
    file = open(filename,'w')
    dump(addressbook,file)
    file.close()
    return

def read(fname):
    file = open(filename)
    addressbook = load(file)
    file.close()
    return addressbook

The advantage of pickle is that you don't have to
decide on a text format for your data -- it just dumps
and then reloads the python code. You can waste a lot
of time deciding on a text format, implementing the
readers/writers, etc.

Rick

--- Eri Mendz
<"erimendz at bluebottle.com"@bluebottle.com> wrote:

> Dear Tutor,
> 
> I like to know what is the proper procedure (is
> algorithmn the right
> term?) in creating data in a program, write it to
> file, close the app
> then retrieve the data when run again. Basically,
> I'm trying to simulate
> a simple address book (well not really for the datas
> are just names for
> now) and so far have created the basic menu
> interface. It is console
> base so forget gui. I ask user input and store it in
> a list. There are
> menus to change, delete the data, and to save the
> data list in file. I
> use cPickle for this and have verified the file is
> created by checking
> in my $PWD. I want to retrieve that data when
> program is run again. What
> to add in my code? I thought not to post the code
> but explain it as
> above.
> 
> What i want: when program is run again, the saved
> data is loaded when user
> selects option 1 below. Of course the first time it
> is run, the list is
> empty.
> 
> def print_options():
>        print '''
>        Options:
>        [1] - Print content of list
>        [2] - Add name to list
>        [3] - Delete name from list
>        [4] - Change name in list
>        [5] - Save list to file
>        [P] - Print this menu
>        [Q] - Quit
>        '''
> 
> 
> 
> -- 
> Regards,
> Eri Mendz
> Using PC-Pine 4.61
> 
> 
> -- 
> Using PC-Pine 4.61
> 
> _______________________________________________
> Tutor maillist  -  Tutor at python.org
> http://mail.python.org/mailman/listinfo/tutor
> 

=====
Rick Muller
rick_muller at yahoo.com


		
__________________________________ 
Do you Yahoo!? 
Yahoo! Mail - Find what you need with new enhanced search.
http://info.mail.yahoo.com/mail_250