nodes.py 文件源码

def __setitem__(self, key, item):
        if isinstance(key, basestring):
            self.attributes[str(key)] = item
        elif isinstance(key, int):
            self.setup_child(item)
            self.children[key] = item
        elif isinstance(key, types.SliceType):
            assert key.step in (None, 1), 'cannot handle slice with stride'
            for node in item:
                self.setup_child(node)
            self.children[key.start:key.stop] = item
        else:
            raise TypeError, ('element index must be an integer, a slice, or '
                              'an attribute name string')