How was the processing of asynchronous operations carried out before the introduction of async/await?

To prevent the creation of a new object inside the __new__ method, you can control the return value of __new__. If __new__ returns None or an object of a different type, the instance creation is prevented.

Example where object creation is blocked:

class NoInstance:
    def __new__(cls, *args, **kwargs):
        print("Object creation is forbidden")
        return None

obj = NoInstance()  # Will print message, obj will be None
print(obj)  # None

Thus, by controlling the return value in __new__, you can prevent instance creation.