__init__.py 文件源码

def create_attribute(self, cls, attr_name):
        async_method = self.property.create_attribute(cls, attr_name)
        original_class = self.original_class

        @functools.wraps(async_method)
        @motor_coroutine
        def wrapper(self, *args, **kwargs):
            result = yield async_method(self, *args, **kwargs)

            # Don't call isinstance(), not checking subclasses.
            if result.__class__ == original_class:
                # Delegate to the current object to wrap the result.
                raise gen.Return(self.wrap(result))
            else:
                raise gen.Return(result)

        if self.doc:
            wrapper.__doc__ = self.doc

        return wrapper