code: def _replace(self, **kwds):
          'Return a new NamedTuple object replacing specified fields with new values'
          result = self._make(map(kwds.pop, self._fields, self))
          
          if kwds:
              raise ValueError('Got unexpected field names: %r' % kwds.keys())
          
          return resulf _replace(self, **kwds):
          'Return a new NamedTuple object replacing specified fields with new values'
          result = self._make(map(kwds.pop, self._fields, self))
          
          if kwds:
              raise ValueError('Got unexpected field names: %r' % kwds.keys())
          
          return result
docs: Return a new NamedTuple object replacing specified fields with new values