How to use the pyodesys.__version__ function in pyodesys

first_step = self.odesys.first_step_expr
        if first_step is not None:
            first_step_cses, first_step_exprs = cse_cb(
                [first_step],
                symbols=self.odesys.be.numbered_symbols('cse'))

        if self.odesys.roots is not None:
            roots_cses, roots_exprs = cse_cb(
                self.odesys.roots,
                symbols=self.odesys.be.numbered_symbols('cse'))

        ns = dict(
            _message_for_rendered=[
                "-*- mode: read-only -*-",
                "This file was generated using pyodesys-%s at %s" % (
                    __version__, dt.now().isoformat())
            ],
            p_odesys=self.odesys,
            p_common={
                'cses': [(symb.name, _ccode(expr)) for symb, expr in common_cses],
                'nsubs': len(common_cse_subs)
            },
            p_rhs={
                'cses': [(symb.name, _ccode(expr)) for symb, expr in rhs_cses],
                'exprs': list(map(_ccode, rhs_exprs))
            },
            p_jtimes=None if jtimes is False else{
                'cses': [(symb.name, _ccode(expr)) for symb, expr in jtimes_cses],
                'exprs': list(map(_ccode, jtimes_exprs))
            },
            p_jac_dense=None if jac is False or nnz >= 0 else {
                'cses': [(symb.name, _ccode(expr)) for symb, expr in jac_cses],