devicetools.py 文件源码

def __new__(cls, value, inlets=None, outlets=None,
                receivers=None, senders=None, keywords=None):
        """Return an already existing :class:`Element` instance or, if such
        an instance does not exist yet, a new newly created one.
        """
        name = str(value)
        if name not in cls._registry:
            self = object.__new__(Element)
            self._check_name(name)
            self._name = name
            self.inlets = connectiontools.Connections(self)
            self.outlets = connectiontools.Connections(self)
            self.receivers = connectiontools.Connections(self)
            self.senders = connectiontools. Connections(self)
            self._keywords = Keywords()
            self._keywords.device = self
            self.model = None
            self._handlers = weakref.WeakSet()
            cls._registry[name] = self
        cls._selection[name] = cls._registry[name]
        return cls._registry[name]