Render a DataFrame to a tabular environment table.

        You can splice this into a LaTeX document.
        Requires ``\\usepackage{booktabs}``.
        Wrapper around the :meth:`pandas.DataFrame.to_latex` method.

def to_latex(self, buf=None, upper_triangle=True, **kwargs):
        """Render a DataFrame to a tabular environment table.

        You can splice this into a LaTeX document.
        Requires ``\\usepackage{booktabs}``.
        Wrapper around the :meth:`pandas.DataFrame.to_latex` method.
        """
        out = self._sympy_formatter()
        out = out._abs_ref_formatter(format_as='latex')
        if not upper_triangle:
            out = out._remove_upper_triangle()
        return out._frame.to_latex(buf=buf, **kwargs)