Python: Save objects in a file

Question

I have defined this class:

class User():
 def __init__(self, ip, update, priority):
    self.ip = ip
    self.update = update
    self.priority = priority

I work with a Socket and every time one client is connect I create an User object. I would like to save it somewhere and then be able to process its data, meaning read the file where it's saved. I don't know how to do that. I tried using a txt file but with the fields of the class User is to complicated and I would also like to have something more dynamic, like

add(user), isPresent(user), overwrite(user)

What is the best solution for my case?

either connect to a database or use pickle and put your info in a dictionary that you can save and read to update — gkusner
– gkusner, Commented Nov 19, 2015 at 14:53
not really - that is more complicated but there are example on-line, try google "python database" — gkusner
– gkusner, Commented Nov 19, 2015 at 15:00

criswell · Accepted Answer · 2015-11-19 14:53:06Z

1

If your User class is really that simple, you can use Pickle:

(both Python 2 and 3 links included).

 u = User(127.0.0.1, "foo", "bar")
 pickle.dumps(u)

answered Nov 19, 2015 at 14:53

criswell

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2 Comments

rebrid Over a year ago

Thanks. What does it happen if I save twice the same object? There will be only one or two entities?

criswell Over a year ago

@m.ridolfi - as far as I know, Pickle should be idempotent. So saving the same object multiple times will have the same result. Now, of course, you have to pick where to save the object (a text file, to a database, whatever), so if you're asking can you physically save the same object twice, that's entirely up to you.

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