def context_decorator(cls, *args, **kwargs):
    def wrapper(self, function, *args, **kwargs):
        def inner(*args, **kwargs):
            cls.__enter__(self)
            result = function(*args, **kwargs)
            cls.__exit__(self, None, None, None)
            return result
        return inner

    cls.__call__ = wrapper
    return cls


@context_decorator
class PrinterContext:
    def __init__(self):
        pass

    def __enter__(self):
        print("Enter")

    def __exit__(self, exc_type, exc_val, exc_tb):
        print("Exit")
        return True