code: def do_args(self, arg):
          
          co = self.curframe.f_code
          dict = self.get_locals(self.curframe)
          n = co.co_argcount
          if co.co_flags & 4: n = n+1
          if co.co_flags & 8: n = n+1
          for i in range(n):
              name = co.co_varnames[i]
              if name in dict:
                  self.message('%s = %s' % (name, bdb.safe_repr(dict[name])))
              else:
                  self.message('%s = *** undefined ***' % (name,))
docs: a(rgs)
          Print the argument list of the current function.