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# Custom Boxstyle01

    from matplotlib.path import Path

    def custom_box_style(x0, y0, width, height, mutation_size, mutation_aspect=1):
        """
        Given the location and size of the box, return the path of
        the box around it.

         - *x0*, *y0*, *width*, *height* : location and size of the box
         - *mutation_size* : a reference scale for the mutation.
         - *aspect_ratio* : aspect-ration for the mutation.
        """

        # note that we are ignoring mutation_aspect. This is okay in general.

        # padding
        mypad = 0.3
        pad = mutation_size * mypad

        # width and height with padding added.
        width = width + 2 * pad
        height = height + 2 * pad

        # boundary of the padded box
        x0, y0 = x0 - pad, y0 - pad
        x1, y1 = x0 + width, y0 + height

        cp = [(x0, y0),
              (x1, y0), (x1, y1), (x0, y1),
              (x0-pad, (y0+y1)/2.), (x0, y0),
              (x0, y0)]

        com = [Path.MOVETO,
               Path.LINETO, Path.LINETO, Path.LINETO,
               Path.LINETO, Path.LINETO,
               Path.CLOSEPOLY]

        path = Path(cp, com)

        return path

    import matplotlib.pyplot as plt

    fig, ax = plt.subplots(figsize=(3, 3))
    ax.text(0.5, 0.5, "Test", size=30, va="center", ha="center",
            bbox=dict(boxstyle=custom_box_style, alpha=0.2))

    plt.show()

Total running time of the script: ( 0 minutes 0.022 seconds)

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