def initAttrs(cls):
        """
        Class decorator: automatically generate an ``__init__`` method that expects args from cls.attrs and stores them.

        Args:
            cls (class): class to decorate

        Returns:
            class: same, but modified, class
        """
        def __init__(self, skype=None, raw=None, *args, **kwargs):
            super(cls, self).__init__(skype, raw)
            # Merge args into kwargs based on cls.attrs.
            for i in range(len(args)):
                kwargs[cls.attrs[i]] = args[i]
            # Disallow any unknown kwargs.
            unknown = set(kwargs) - set(cls.attrs)
            if unknown:
                unknownDesc = "an unexpected keyword argument" if len(unknown) == 1 else "unexpected keyword arguments"
                unknownList = ", ".join("'{0}'".format(k) for k in sorted(unknown))
                raise TypeError("__init__() got {0} {1}".format(unknownDesc, unknownList))
            # Set each attribute from kwargs, or use the default if not specified.
            for k in cls.attrs:
                setattr(self, k, kwargs.get(k, cls.defaults.get(k)))

        # Add the init method to the class.
        setattr(cls, "__init__", __init__)
        return cls
Class decorator: automatically generate an ``__init__`` method that expects args from cls.attrs and stores them.

        Args:
            cls (class): class to decorate

        Returns:
            class: same, but modified, class