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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 write_lst(self):
 """ Dump the variable name lst file :return: succeed flag """


        ret = False
        out = ''
        system = self.system
        dae = self.system.dae
        varname = self.system.varname
        template = '{:>6g}, {:>25s}, {:>35s}\n'

        # header line
        out += template.format(0, 'Time [s]', '$Time\\ [s]$')

        # include line flow variables in algebraic variables
        nflows = 0
        if self.system.tds.config.compute_flows:
            nflows = 2 * self.system.Bus.n + \
                     8 * self.system.Line.n + \
                     2 * self.system.Area.n_combination

        # output variable indices
        if system.Recorder.n == 0:
            state_idx = list(range(dae.n))
            algeb_idx = list(range(dae.n, dae.n + dae.m + nflows))
            idx = state_idx + algeb_idx
        else:
            idx = system.Recorder.varout_idx

        # variable names concatenated
        uname = varname.unamex + varname.unamey
        fname = varname.fnamex + varname.fnamey

        for e, i in enumerate(idx):
            out += template.format(e + 1, uname[i], fname[i])

        try:
            with open(self.system.files.lst, 'w') as f:
                f.write(out)
            ret = True
        except IOError:
            logger.error('I/O Error while writing the lst file.')

        return ret