python-study-27

异常处理

语法错误：编译不通过

逻辑错误：执行报错

常见错误类型： IndexError KeyError ZerodivisionError AttributeError TypeError ValueError

捕获异常并处理

try:

   1/0

except KeyError as e:
    print(e)
except IndexError as e:
    print(e)
except Exception as e:
    print('qq')
    print(e)
else:
    print('我是else里的东西')
finally:
    print('我用于会执行')
print('2222')

# 自定义异常

class MyException(BaseException):
    def __init__(self,msg):
        super().__init__()
        self.msg=msg
    def __str__(self):
        return self.msg

raise MyException('我错了')