python 进阶 异常处理

• 最简单的异常处理

  inp = input("请输入数字：")
  try:
      num = int(inp)
      print(num)
  except Exception as e:
      print("你输入的不是数字")
  # -------------------------------------------------------------
  li = []
  try:
      li = []
      li[999]
  
  # 捕捉多个异常，并进行处理
  except IndexError as e:
       print("索引错误")
  except ValueError as e:
      print("值错误")
  except Exception as e:
      print(e)
  

• 手动触发异常

  try:
      print("123")
      raise Exception("出错了。。。")
  except Exception as e:
      # 封装错误信息的对象
      print(e)
  
  class MyException(Exception):
  
       def __init__(self, msg):
            self.message = msg
  
       def __str__(self):
            return self.message
       
   try:
       raise MyException("我的异常")
   except MyException as e:
   print(e)