Python 调度程序中的异常

Question

我正在使用 Google Colab，在 Python 上还很新，但我正在尝试构建一个具有三种状态“绿色”、“黄色”和“红色”的机器人。这是基本的机器人，每 10 秒运行一次，如果它是运行并且我按下停止按钮一次，它会变成黄色，但是我第二次按下停止按钮时我得到“在处理上述过程中异常，发生另一个异常：”。这是代码：

import sched, time, datetime, json

try:
    def run_bot(sc):
        if botstate == "green":
            print(datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S") + " doing " + botstate + " state stuff")
            s.enter(10, 1, run_bot, (sc,))
            s.run()
        elif botstate == "yellow":
            print(datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S") + " doing " + botstate + " state stuff")
            s.enter(10, 1, run_bot, (sc,))
            s.run()
        else:
            print(datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S") + " FINISHED")


    # START POINT
    print(datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S"))
    botstate = "green"
    s = sched.scheduler(time.time, time.sleep)
    s.enter(10, 1, run_bot, (s,))
    s.run()
except KeyboardInterrupt:
    if botstate == "green":
        botstate = "yellow"
        print(datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S") + " botstate set to " + botstate + ", shutdown state entered")
        s.run()
    else:
        print(datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S") + " HARD FINISHED")

非常感谢任何帮助！

Answer 1

第一次调用 s.run() 时，您处于 try 块中。当您按下 ctrl-c 时，您将进入 KeyboardInterrupt 异常块。

然后在该块中再次调用 s.run()，但这次您不在 try 块中，因此再次按 ctrl-c 会引发未捕获的异常。

Answer 2

根据已接受的答案，我更改了异常部分，此示例现在可以完美运行：

import sched, time, datetime, json

try:
  def run_bot(sc): 
      if botstate == "green":
        print(datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S") + " doing " + botstate + " state stuff")
      elif botstate == "yellow":
        print(datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S") + " doing " + botstate + " state stuff")

      # recurse
      s.enter(10, 1, run_bot, (sc,))
      s.run()

  # START POINT
  print (datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S") + " STARTED")
  botstate = "green"
  s = sched.scheduler(time.time, time.sleep)
  s.enter(10, 1, run_bot, (s,))
  s.run()
except KeyboardInterrupt:
  try:
    if botstate == "green":
      botstate = "yellow"
      print(datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S") + " botstate set to " + botstate + ", shutdown state entered")
      s.run()
  except KeyboardInterrupt:
    print(datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S") + " FINISHED")

Python 调度程序中的异常

Exception in Python scheduler

python

exception

scheduler