异常处理

 

names = ['alex','jack']
data = {}

try:
    #names[3]
    #data['name']
    open("tes.txt")
except KeyError as e:
    print("没有这个key",e)
except IndexError as e :
    print("列表操作错误",e)
except Exception as e:
    print("未知错误",e)
else:
    print("一切正常")
finally:
    print("不管有没有错，都执行")