How to use 'matplotlib flip y axis' in Python

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def setup_axis(X, Y, ax=None, fig=None, ylims=None):
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    """Setup axis, including timer for animation or snaps
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    Parameters
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    ----------
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    X :
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        space disctretization to get limits
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    Y :
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        solution to get limits
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    ax :
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        ax where to put everything, if None current axes are used (Default value = None)
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    fig :
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        fig where to put everything, if None current figure is used (Default value = None)
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    ylims :
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        custom ylims, if None y axis limits are calculated from Y (Default value = None)
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    Returns
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    -------
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    ax
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    fig
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    time_text
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        object to fill in text
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    """
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    if ax is None:
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        fig = plt.gcf()
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        ax = plt.gca()
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    if ylims is None:
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        lowery = nm.min(Y) - nm.min(Y) / 10
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        uppery = nm.max(Y) + nm.max(Y) / 10
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    else:
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        lowery = ylims[0]
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        uppery = ylims[1]
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    ax.set_ylim(lowery, uppery)
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    ax.set_xlim(X[0], X[-1])
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    time_text = ax.text(X[0] + nm.sign(X[0]) * X[0] / 10,
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                        uppery - uppery / 10,
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                        'empty', fontsize=15)
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    return ax, fig, time_text

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def flip_y(self):
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    """
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    Flip the y_min/y_max limits.
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    """
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    self.y_lim_helper.flip_limits()