如何在python中的不同类上使用相同的对象？

Question

This is probably a very basic question.

I have some objects that I want to be created once and then used by many classes of my application, for instance "logging" and "db". I don't wanna make a new connection to the DB everytime a different class wants to do something.

So my idea was to create a Class like:

class MyDB(object):
    mydb=createMySQLconnection()

then I'd do "from ... import MyDB" and use MyDB.mydb

would it work? is this the best way to do that?

Answer 1

This would work, but there's no reason to create a class. Just put mydb in a module as a free-standing variable.

Often, when you'd use a singleton in other programming languages, you can get by in Python with a module.

Answer 2

Here is an example for implementing singleton pattern in python.

Python and the Singleton Pattern