notes/Python/python-基础-异常处理.py at master · JavaDevTeam/notes · GitHub

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python-异常处理 |

------------------------

* 跟JAVA差不多

* 异常的处理有优先级,在继承最底层的类应该在上面.

* 处理语法

# 每个异常单独 catch

try:

pass

except LookupError as error:

pass

except KeyError as error:

pass

finally:

pass

# 多个异常统一 catch

try:

pass

except (LookupError,KeyError) as error:

pass

finally:

pass

# 带 else 的catch

try:

pass

except (LookupError,KeyError) as error:

pass

else:

print('一切正常,当程序正常,没有发生异常的时候执行')

finally:

pass

* 抛出异常

raise BaseException("哦豁,异常了")

------------------------

python-异常类体系 |

------------------------

Exception

------------------------

python-自定义异常 |

------------------------

* 自定义类,继承 :Exception 类

* 使用 raise 抛出异常(其实也是创建异常实例)

* demo

class ServiceException(Exception):

def __init__(self,info):

self.info = info

# def __str__(self):

# return self.info

try:

raise ServiceException('自定义异常信息')

except ServiceException as serviceException:

print(serviceException) # 自定义异常信息