python中的异常处理

青旅半醒 2021-12-05 05:59 278阅读 0赞

## 异常处理 ##

try:  
尝试执行的代码  
except:  
出现错误的处理

try:
        num = int(input('请输入一个数字: '))
    except:
        print('请输入正确的整数')

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 1]

> 需求：  
> 1.提示用户输入一个整数  
> 2.使用8来除以用户输入的数  
> try:  
> 尝试执行的代码  
> except 错误类型1:  
> 出现错误1的处理方式  
> except 错误类型2:  
> 出现错误2的处理方式

try:
        num = int(input('请输入一个整数: '))
        result = 8 / num
        print(result)
    
    except ValueError:
        print('输入的值不是合法的整数')
    
    except ZeroDivisionError:
        print('0不能做除数')
    
    except Exception as r:
        print('未知错误 %s' %(r))
    
    finally:
        print('~~~~~~~~~~~~')

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 2]![在这里插入图片描述][20190717212308324.png]  
![在这里插入图片描述][20190717212314633.png]

## 主动抛出异常 ##

需求: 提示用户输入密码 如果长度小于8位就抛出异常

def input_passwd():
        pwd = input('请输入密码: ')
    
        if len(pwd) >= 8:
            return pwd
    
        print('主动抛出异常')
        ex = Exception('密码长度不足!')
        raise ex
    
    try:
        print(input_passwd())
    except Exception as r:
        print(r)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 3]![在这里插入图片描述][20190717212459104.png]

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 1]: /images/20211205/765a3c7121314082b8049ea7686dabc3.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20190717212304617.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg==,size_16,color_FFFFFF,t_70
[20190717212308324.png]: /images/20211205/273ab3c47650475abeb2c6f41d547902.png
[20190717212314633.png]: /images/20211205/7175c23a038745cc999165f5e0e3cf87.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20190717212452395.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg==,size_16,color_FFFFFF,t_70
[20190717212459104.png]: /images/20211205/084185b7ef9449c7bb3f0ccab13257ad.png