@NotNull
    @Override
    protected Maybe<PyCallable> translate(@Nullable PyExpression expr) {
      if (expr == null || expr instanceof PyNoneLiteralExpression) {
        return NONE;
      }
      if (expr instanceof PyCallable) {
        return new Maybe<>((PyCallable)expr);
      }
      final PsiReference ref = expr.getReference();
      if (ref != null) {
        PsiElement something = ref.resolve();
        if (something instanceof PyCallable) {
          return new Maybe<>((PyCallable)something);
        }
      }
      return NONE;
    }
@NotNull
    @Override
    protected Maybe<PyCallable> translate(@Nullable PyExpression expr)