ol, default: False
        If ``False``, get/set the major ticks/labels; if ``True``, the minor
        ticks/labels.
    **kwargs
        `.Text` properties can be used to control the appearance of the labels.

    Returns
    -------
    locs
        The list of xtick locations.
    labels
        The list of xlabel `.Text` objects.

    Notes
    -----
    Calling this function with no arguments (e.g. ``xticks()``) is the pyplot
    equivalent of calling `~.Axes.get_xticks` and `~.Axes.get_xticklabels` on
    the current axes.
    Calling this function with arguments is the pyplot equivalent of calling
    `~.Axes.set_xticks` and `~.Axes.set_xticklabels` on the current axes.

    Examples
    --------
    >>> locs, labels = xticks()  # Get the current locations and labels.
    >>> xticks(np.arange(0, 1, step=0.2))  # Set label locations.
    >>> xticks(np.arange(3), ['Tom', 'Dick', 'Sue'])  # Set text labels.
    >>> xticks([0, 1, 2], ['January', 'February', 'March'],
    ...        rotation=20)  # Set text labels and properties.
    >>> xticks([])  # Disable xticks.
    Nr