code: def set_prompt(self, prompt=None):
          
          if prompt is None:
              self.manual_prompt_re = prompt
          else:
              self.manual_prompt_re = to_regexs(prompt)
docs: Defines a pattern that is waited for when calling the expect_prompt()
          method.
          If the set_prompt() method is not called, or if it is called with the
          prompt argument set to None, a default prompt is used that should
          work with many devices running Unix, IOS, IOS-XR, or Junos and others.
  
          :type  prompt: RegEx
          :param prompt: The pattern that matches the prompt of the remote host.