suite_for_Exception1_to_ExceptionN_with_Argument reason是异常类的实例,该实例有个属性,名为args,args是个元组,其中包含了该异常的提示信息: defsafe_float(obj):try: retval=float(obj)exceptValueError,e:print'type of e is', type(e)print'e is',
https://docs.python.org/2/library/sys.html?highlight=sys#module-sys 该方法返回三个值:type, value, traceback. type (异常类别) get the exception type of the exception being handled (a class object) value (异常说明,可带参数) get the exception parameter (a class instance) traceback (trace...
For eachtryblock, there can be zero or moreexceptblocks. Multipleexceptblocks allow us to handle each exception differently. The argument type of eachexceptblock indicates the type of exception that can be handled by it. For example, try: even_numbers = [2,4,6,8]print(even_numbers[5])ex...
如果需要捕获所有因错误而引起的异常,可以直接捕获Exception异常,Exception是绝大多数Python内建异常的基类。 但是对于SystemExit和KeyboardInterupt这两个异常,使用Exception是无法捕获的,因为它们不是Exception的继承者,原因很简单,因为这两个异常不是由于错误条件引起的。SystemExit是由于当前Python应用程序需要退出,KeyboardIn...
NameError: --func1 exception--定义: traceback.print_exception(etype, value, tb[, limit[, file]])与print_tb相比多了两个参数etype和value,分别是exception type和exception value,加上tb(traceback object),正好是sys.exc_info()返回的三个值 ...
except Exception as E: raise TypeError('bad input') from E 1. 2. 3. 4. 执行的结果如下: Traceback (most recent call last): File "hh.py", line 2, in <module> 1/0 ZeroDivisionError: division by zero The above exception was the direct cause of the following exception: ...
classError(Exception): """Base class for exceptions in this module.""" pass classInputError(Error): """Exception raised for errors in the input. Attributes: expression -- input expression in which the error occurred message -- explanation of the error ...
classBlock:def__enter__(self):print('entering to the block')returnselfdefprt(self, args):print('this is the block we do %s'% args)def__exit__(self,exc_type, exc_value, exc_tb):ifexc_typeisNone:print('exit normally without exception')else:print('found exception: %s, and detailed...
try: gail() except AlreadyGotOne: print('got exception') class Career(Exception): def __init__(self, job, *args, **kwargs): super(Career, self).__init__(*args, **kwargs) self._job = job def __str__(self): return 'So I became a waiter of {}'.format(self._job) raise ...
可以抛出 Exception("异常信息"),Exception 是一个通用类型的异常。 此外,仅一个 raise 也能构成抛出异常的语句,这会将当前语句中已经捕获的异常再次抛出。 示例。 raise ZeroDivisionError("零不能做分母") # (11) # ZeroDivisionError: 零不能做分母 raise ZeroDivisionError # (12) # ZeroDivisionError raise Exc...