python异常处理基础笔记

与C++异常类似,

try:
    pass
exception NameError:
    dosomething....
finally:
    dosomething    

finally: 下面的无论是否发生异常都会执行;

异常值:

除了自带的异常外, 自定义的异常是继承与Exception类:

class ErrorInput(Exception):
   pass

抛出异常:

def fun():
   raise ErrorInput()