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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def svg_html_from_pyplot_figure(fig: "Figure") -> str: """ Converts a ``pyplot`` figure to an SVG tag. """

    if fig is None:
        return ""
    memfile = io.BytesIO()  # StringIO doesn't like mixing str/unicode
    fig.savefig(memfile, format="svg")
    return memfile.getvalue().decode("utf-8")