def IsMember(self, member_id, group_id):
    uri = self._ServiceUrl('member', True, group_id, member_id, '')
    return self._IsExisted(uri)
Check whether the given member already exists in the given group.
dataset/ETHPy150Open acil-bwh/SlicerCIP/Scripted/attic/PicasaSnap/gdata/apps/groups/service.py/GroupsService.IsMember