code: def magic_generate_random(self, line):
          
          line = line.strip().lower()
          if not line or line == 'true':
              self.interpreter.generate_random = True
          elif line == 'false':
              self.interpreter.generate_random = False
          else:
              stream_content = {'name': 'stderr', 'text': "unknwon value '{}'".format(line)}
              self.send_response(self.iopub_socket, 'stream', stream_content)
              return {'status': 'error',
                      'execution_count': self.execution_count,
                      'ename': ValueError.__name__,
                      'evalue': "unknwon value '{}'".format(line),
                      'traceback': '???'}
docs: Set the generate random flag, unset registers and memory will return a random value.
  
          Usage:
          Call the magic by itself or with `true` to have registers and memory return a random value
          if they are unset and read from, much like how real hardware would work.
          Defaults to False, or to not generate random values
  
          `%generate_random`
          or
          `%generate_random true`
          or
          `%generate_random false`