Question

Is there such a thing as a static constructor in Python?

How do I implement a static constructor in Python?

Here is my code… The __init__ doesn’t fire when I call App like this. The __init__ is not a static constructor or static initializer.

App.EmailQueue.DoSomething()

I have to call it like this, which instantiates the App class every time:

App().EmailQueue.DoSomething()

Here is my class:

class App:
    def __init__(self):
        self._mailQueue = EmailQueue()

    @property
    def EmailQueue(self):
        return self._mailQueue

The problem with calling __init__ every time is that the App object gets recreated. My “real” App class is quite long.

Answer 1

Hint: anything that references self is going to require an instantiation of the class. You could do it like this:

class App:
    email_queue = EmailQueue()

App.email_queue.do_something()

But come on, that seems like a lot of fluff. I’m with SLaks, just initialize it outside of the class. Alternatively, you could look into the singleton pattern.