How to use 'rotate xticks matplotlib' in Python

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def rotateTickLabels(ax, rotation, which, rotation_mode="anchor", ha="right"):
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    """ Rotates the ticklabels of a matplotlib Axes
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    Parameters
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    ----------
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    ax : matplotlib Axes
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        The Axes object that will be modified.
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    rotation : float
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        The amount of rotation, in degrees, to be applied to the labels.
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    which : string
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        The axis whose ticklabels will be rotated. Valid values are 'x',
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        'y', or 'both'.
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    rotation_mode : string, optional
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        The rotation point for the ticklabels. Highly recommended to use
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        the default value ('anchor').
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    ha : string
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        The horizontal alignment of the ticks. Again, recommended to use
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        the default ('right').
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    Returns
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    -------
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    None
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    """
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    if which == "both":
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        rotateTickLabels(ax, rotation, "x", rotation_mode=rotation_mode, ha=ha)
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        rotateTickLabels(ax, rotation, "y", rotation_mode=rotation_mode, ha=ha)
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    else:
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        if which == "x":
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            axis = ax.xaxis
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        elif which == "y":
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            axis = ax.yaxis
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        for t in axis.get_ticklabels():
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            t.set_horizontalalignment(ha)
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            t.set_rotation(rotation)
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            t.set_rotation_mode(rotation_mode)