loadables.py 文件源码

python
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项目:zun 作者: openstack 项目源码 文件源码
def get_matching_classes(self, loadable_class_names):
        """Get loadable classes from a list of names.

        Each name can be a full module path or the full path to a
        method that returns classes to use.  The latter behavior
        is useful to specify a method that returns a list of
        classes to use in a default case.
        """

        classes = []
        for cls_name in loadable_class_names:
            obj = importutils.import_class(cls_name)
            if self._is_correct_class(obj):
                classes.append(obj)
            elif inspect.isfunction(obj):
                # Get list of classes from a function
                for cls in obj():
                    classes.append(cls)
            else:
                error_str = 'Not a class of the correct type'
                raise exception.ClassNotFound(class_name=cls_name,
                                              exception=error_str)
        return classes
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