@Nullable
  public static PsiElement getNextComma(@NotNull PsiElement element) {
    final PsiElement nextNode = getNextNonWhitespaceSibling(element);
    return nextNode != null && nextNode.getNode().getElementType() == PyTokenTypes.COMMA ? nextNode : null;
  }
@Nullable
  public static PsiElement getNextComma(@NotNull PsiElement element)