Sets the title on the current axes.

        Parameters
        ----------
        title: string, default: None
            Add title to figure or if None leave untitled.

def set_title(self, title=None):
        """
        Sets the title on the current axes.

        Parameters
        ----------
        title: string, default: None
            Add title to figure or if None leave untitled.
        """
        title = self.title or title
        if title is not None:
            self.ax.set_title(title)