code: def as_namespace(self, namespace=None):
          
          key = self.key
          if namespace and key.startswith(namespace):
              key = key[len(namespace) + 1:]
  
          return "%s = %s" % (self.get_key(), self._default() or NotSet())
docs: Return this call as if it were being assigned in a pyconfig namespace.
  
          If `namespace` is specified and matches the top level of this call's
          :attr:`key`, then that section of the key will be removed.