Correct use of try,except and raise?
kasterma at bart-kastermanss-macbook.local
Sun Jul 13 12:32:12 CEST 2008
Roy Smith <roy at panix.com> writes:
> ssecorp <circularfunc at gmail.com> wrote:
>> i dont get what you mean, if i dont do anything python will raise an
>> indexerror so it is an indexerror.
> You wrote:
>> > > def pop(self):
>> > > try:
>> > > return self.queue.pop(0)
>> > > except:
>> > > raise IndexError, "pop from empty queue"
> You are assuming that the only possible exception that can be thrown by
> "return self.queue.pop(0)" is IndexError. Maybe, maybe not. I gave you
> one example of how something else could be thrown -- a typo in your code
> leading to a NameError. Maybe even something more exotic like MemoryError?
> The defensive thing to do is catch exactly the exception you expect to
> happen. In this case, that means IndexError.
And you do that by
except IndexError, e:
if you want access to the exception as well.
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