http://code.google.com/apis/***/2.0/reference.html#***_data_api_tag_yt:accessControl

按照 API 文档，您可以按如下方式构建此元素:

Following the API documentation, you can build this element as follows:

from gdata.media import ***_NAMESPACE
from atom import ExtensionElement

# set video as unlisted
kwargs = {
    "namespace": ***_NAMESPACE,
    "attributes": {'action': 'list', 'permission': 'denied'},
}
extension = ([ExtensionElement('accessControl', **kwargs)])

# create the gdata.***.***VideoEntry
video_entry = gdata.***.***VideoEntry(media=my_media_group,
    geo=where, extension_elements=extension)