code: def load_servers_from_env(self, filter=[], dynamic=None):
          '''Load the name servers environment variable and parse each server in
          the list.
  
          @param filter Restrict the parsed objects to only those in this
                        path. For example, setting filter to [['/',
                        'localhost', 'host.cxt', 'comp1.rtc']] will
                        prevent 'comp2.rtc' in the same naming context
                        from being parsed.
          @param dynamic Override the tree-wide dynamic setting. If not provided,
                         the value given when the tree was created will be used.
  
          '''
          if dynamic == None:
              dynamic = self._dynamic
          if NAMESERVERS_ENV_VAR in os.environ:
              servers = [s for s in os.environ[NAMESERVERS_ENV_VAR].split(';') \
                           if s]
              self._parse_name_servers(servers, filter, dynamicf load_servers_from_env(self, filter=[], dynamic=None):
          '''Load the name servers environment variable and parse each server in
          the list.
  
          @param filter Restrict the parsed objects to only those in this
                        path. For example, setting filter to [['/',
                        'localhost', 'host.cxt', 'comp1.rtc']] will
                        prevent 'comp2.rtc' in the same naming context
                        from being parsed.
          @param dynamic Override the tree-wide dynamic setting. If not provided,
                         the value given when the tree was created will be used.
  
          '''
          if dynamic == None:
              dynamic = self._dynamic
          if NAMESERVERS_ENV_VAR in os.environ:
              servers = [s for s in os.environ[NAMESERVERS_ENV_VAR].split(';') \
                           if s]
              self._parse_name_servers(servers, filter, dynamic)
docs: Load the name servers environment variable and parse each server in
          the list.
  
          @param filter Restrict the parsed objects to only those in this
                        path. For example, setting filter to [['/',
                        'localhost', 'host.cxt', 'comp1.rtc']] will
                        prevent 'comp2.rtc' in the same naming context
                        from being parsed.
          @param dynamic Override the tree-wide dynamic setting. If not provided,
                         the value given when the tree was created will be used.