Request Pattern - Strong

request_strong.py

class Request(object):
    def __call__(self, *args, **kwargs):
        return self.request_first(*args, **kwargs)

    def __init__(self, **kwargs):
        self.__slots = []

    def request(self, *args, **kwargs):
        """Return generator, yielding one return value per slot"""
        for subs in self.__slots:
            yield subs(*args, **kwargs)

    def request_first(self, *args, **kwargs):
        """Return first available result"""
        try:
            return next(self.request(*args, **kwargs))
        except StopIteration:
            return None
        return None

    def connect(self, func):
        self.__slots.append(func)

    def disconnect(self, func):
        try:
            self.__slots.remove(func)
        except ValueError: