Simply loop over the internal dictionary and
        echo the list size at each key (i.e. the number
        of files).

def stats_compute(self, *args, **kwargs):
        """
        Simply loop over the internal dictionary and
        echo the list size at each key (i.e. the number
        of files).
        """
        totalElements   = 0
        totalKeys       = 0
        totalSize       = 0
        l_stats         = []
        d_report        = {}

        for k, v in sorted(self.d_inputTreeCallback.items(), 
                            key         = lambda kv: (kv[1]['diskUsage_raw']),
                            reverse     = self.b_statsReverse):
            str_report  = "files: %5d; raw size: %12d; human size: %8s; %s" % (\
                    len(self.d_inputTree[k]), 
                    self.d_inputTreeCallback[k]['diskUsage_raw'], 
                    self.d_inputTreeCallback[k]['diskUsage_human'], 
                    k)
            d_report = {
                'files':            len(self.d_inputTree[k]),
                'diskUsage_raw':    self.d_inputTreeCallback[k]['diskUsage_raw'],
                'diskUsage_human':  self.d_inputTreeCallback[k]['diskUsage_human'],
                'path':             k
            }
            self.dp.qprint(str_report, level = 1)
            l_stats.append(d_report)
            totalElements   += len(v)
            totalKeys       += 1
            totalSize       += self.d_inputTreeCallback[k]['diskUsage_raw']
        str_totalSize_human = self.sizeof_fmt(totalSize)
        return {
            'status':           True,
            'dirs':             totalKeys,
            'files':            totalElements,
            'totalSize':        totalSize,
            'totalSize_human':  str_totalSize_human,
            'l_stats':          l_stats,
            'runTime':          other.toc()
        }