code: def output(self, _filename):
          
  
          txt = ""
          for c in self.contracts:
              (name, _inheritance, _var, func_summaries, _modif_summaries) = c.get_summary()
              txt += blue("\n+ Contract %s\n"%name)
              # (c_name, f_name, visi, _, _, _, _, _) in func_summaries
              public = [(elem[0], (elem[1], elem[2]) ) for elem in func_summaries]
  
              collect = collections.defaultdict(list)
              for a,b in public:
                  collect[a].append(b)
              public = list(collect.items())
  
              for contract, functions in public:
                  txt += blue("  - From {}\n".format(contract))
                  functions = sorted(functions)
                  for (function, visi) in functions:
                      if visi in ['external', 'public']:
                          txt += green("    - {} ({})\n".format(function, visi))
                  for (function, visi) in functions:
                      if visi in ['internal', 'private']:
                          txt += magenta("    - {} ({})\n".format(function, visi))
                  for (function, visi) in functions:
                      if visi not in ['external', 'public', 'internal', 'private']:
                          txt += "    - {}  ({})\n".format(function, visi)
  
          self.info(txt)
docs: _filename is not used
              Args:
                  _filename(string)