def indent_lines(s, indent=4, skip=0):
    """Indents the lines in the given string.

    Args:
        s: the string
        indent (4): the number of spaces to indent
        skip (0): the number of lines to skip before indenting

    Returns:
        the indented string
    """
    lines = s.split("\n")

    skipped_lines = lines[:skip]
    if skipped_lines:
        skipped = "\n".join(skipped_lines)
    else:
        skipped = None

    indent_lines = lines[skip:]
    if indent_lines:
        indented = "\n".join((" " * indent) + l for l in indent_lines)
    else:
        indented = None

    if skipped is not None and indented is not None:
        return skipped + "\n" + indented

    if skipped is not None:
        return skipped

    if indented is not None:
        return indented

    return s