On Mon, Mar 21, 2016 at 1:04 PM, BartC <b...@freeuk.com> wrote:
> On 21/03/2016 01:35, Chris Angelico wrote:
>>
>> On Mon, Mar 21, 2016 at 12:28 PM, Mark Lawrence <breamore...@yahoo.co.uk>
>> wrote:
>>>
>>> I got to line 22, saw the bare except, and promptly gave up.
>>
>>
>> Oh, keep going, Mark. It gets better.
>>
>> def readstrfile(file):
>> try:
>> data=open(file,"r").read()
>> except:
>> return 0
>> return data
>>
>> def start():
>> psource=readstrfile(infile)
>> if psource==0:
>> print ("Can't open file",infile)
>> exit(0)
>>
>>
>>
>> So, if any exception happens during the reading of the file, it gets
>> squashed, and 0 is returned - which results in a generic message being
>> printed, and the program terminating, with return value 0. Awesome!
>
>
> I don't have a clue about exceptions, but why wouldn't read errors be picked
> up by the same except: block?
They are. So would NameError, AttributeError, KeyboardInterrupt, and
anything else that happens to get raised. Everything gets absorbed
into the same message, "Can't open file", and then the program exits 0
to make absolutely sure that the caller can't figure anything out.
ChrisA
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