code: def onecmd(self, line):
          
          if line == '\\':
              return True
          elif line == 'EOF':
              print('\r', end='')
              return True
          else:
              try:
                  v = q(line)
              except kerr as e:
                  print("'%s" % e.args[0])
              else:
                  if v != q('::'):
                      v.show()
              return False
docs: Interpret the line