@Nullable
  private PsiElement resolveNotNestedBinaryExpression(@NotNull PyBinaryExpression containedExpression) {
    assert myPosition >= 0;
    PyExpression left = containedExpression.getLeftExpression();
    PyExpression right = containedExpression.getRightExpression();
    if (left instanceof PyParenthesizedExpression) {
      PyExpression leftTuple = PyPsiUtils.flattenParens(left);
      if (leftTuple instanceof PyTupleExpression) {
        PyExpression[] leftTupleElements = ((PyTupleExpression)leftTuple).getElements();
        int leftTupleLength = leftTupleElements.length;
        if (leftTupleLength > myPosition) {
          return leftTupleElements[myPosition];
        }
        if (right instanceof PyTupleExpression) {
          PyExpression[] rightTupleElements = ((PyTupleExpression)right).getElements();
          int rightLength = rightTupleElements.length;
          if (leftTupleLength + rightLength > myPosition) return rightTupleElements[myPosition - leftTupleLength];
        }
      }
    }
    return containedExpression;
  }
@Nullable
  private PsiElement resolveNotNestedBinaryExpression(@NotNull PyBinaryExpression containedExpression)