Manage class instancing on a global scope in python

I wish to control the time of instancing of a class MyClass, it needs to be unique and be able to reference it globally

# myclass.py
class MyClass():
    def __init__(self):
        pass

    def hello(self):
        return 'world'

class MyManager():
    def __init__(self):
        self.instance = None

    def create(self):
        self.instance = MyClass

manager = MyManager

The reason for this is because the class im working with have some dependencies at initialization which do not exist at the time of modu开发者_开发知识库le import. (For the sake of the example above, I've left out the dependency)

# main.py
import myclass

myclass.manager.create

instance = myclass.manager.instance

hello = instance.hello

Now this is giving an error:

AttributeError: class MyManager has no attribute 'instance'

Im relatively new to python, and have mostly been using it for linear scripts. What am i missing?

You never actually call myclass.manager.create(), since you forgot the parens. Add them. You probably meant to call MyManager() and MyClass() as well, in order to instantiate them.