code: def basekey(self, meta, *args):
          
          key = '%s%s' % (self.namespace, meta.modelkey)
          postfix = ':'.join((str(p) for p in args if p is not None))
          return '%s:%s' % (key, postfix) if postfix else key
docs: Calculate the key to access model data.
  
  :parameter meta: a :class:`stdnet.odm.Metaclass`.
  :parameter args: optional list of strings to prepend to the basekey.
  :rtype: a native string