recipe-576787.py 文件源码

def __new__(cls, name, bases, attrs):
        new_class = super(AliasType, cls).__new__(cls, name, bases, attrs)

        # see whether we've got an Alias inner class:
        if inspect.isclass(attrs.get('Alias', None)):
            alias = attrs['Alias']
            setattr(new_class, '__aliases', {})
            for attr, value in alias.__dict__.items():
                # don't want any "private" attrs appearing
                if attr.startswith('_'):
                    continue
                # don't care if these aren't tuples or lists
                if not isinstance(value, (tuple, list)):
                    continue
                # no point in setting up an alias for something which isn't a
                # class attribute:
                if not attr in attrs:
                    continue

                # if we've got to here put the lookups into the __aliases dict:
                for key in value:
                    new_class.__dict__['__aliases'][key] = attr
                    setattr(new_class, key, AliasDescriptor(key))

        return new_class