"pickle" vs. f.write()

[Johan Kohler]

Hi,

I have a class with attributes that are string, integer and list. eg.

class person:
name =""
age = 0
friends=[]
comment=""""""

me = person()

I want to save a whole bunch of instances to a file, a classic "records"
file I/O.

To write the file, I can do f.write(str([me.name, me.age, me.friends,
me.comment]) + "\n"

This works nicely for writing, but when reading, I cannot convert the
string easily to a list:
list(f.readline()) is not the same as [me.name, me.age, me.friends,
me.comment]

I was wondering whether pickle might make this easier - an example would
be much appreciated.

Otherwise, what is the best "Python" way to write and read this data
structure?

Thanks in advance...

Johan

__
Yes, I do feel stupid asking this, but time's-a-runnin' out..
--
Using Opera's revolutionary e-mail client: http://www.opera.com/m2/
--------------------------------------------------------------------
Please find our disclaimer at http://www.ukzn.ac.za/disclaimer
--------------------------------------------------------------------
<<<<gwavasig>>>>

[Peter Maas]

Johan Kohler schrieb:

class person:
name =""
age = 0
friends=[]
comment=""""""

me = person()

Otherwise, what is the best "Python" way to write and read this data
structure?

import pickle

class person:
name =""
age = 0
friends=[]
comment=""""""

me = person()

# store
pf = file('/tmp/pickletest', 'w')
pickle.dump(me, pf)
pf.close()
# load
pf = file('/tmp/pickletest', 'r')
me2 = pickle.load(pf)
pf.close()

This is sequential access. If you want to have random access, look
for shelve.

--
-------------------------------------------------------------------
Peter Maas, M+R Infosysteme, D-52070 Aachen, Tel [phone]
E-mail 'cGV0ZXIubWFhc0BtcGx1c3IuZGU=\n'.decode('base64')
-------------------------------------------------------------------

[Johan Kohler]

Thanks... works like a charm :-)

On Wed, 26 Jan 2005 12:55:38 +0100, Peter Maas <pe***@somewhere.com> wrote:

Johan Kohler schrieb:

class person:
name =""
age = 0
friends=[]
comment=""""""
me = person()
Otherwise, what is the best "Python" way to write and read this data
structure?

import pickle

class person:
name =""
age = 0
friends=[]
comment=""""""

me = person()

# store
pf = file('/tmp/pickletest', 'w')
pickle.dump(me, pf)
pf.close()
# load
pf = file('/tmp/pickletest', 'r')
me2 = pickle.load(pf)
pf.close()

This is sequential access. If you want to have random access, look
for shelve.

--
Using Opera's revolutionary e-mail client: http://www.opera.com/m2/
--------------------------------------------------------------------
Please find our disclaimer at http://www.ukzn.ac.za/disclaimer
--------------------------------------------------------------------
<<<<gwavasig>>>>