in place list modification necessary? What's a better idiom?

R. David Murray rdmurray at bitdance.com
Tue Apr 7 15:51:21 CEST 2009


On Tue, 7 Apr 2009 at 09:01, andrew cooke wrote:
> R. David Murray wrote:
>>>   [...]
>>>   try:
>>>     dimensions.append(float(s))
>>>   except:
>>>     dimensions.append(float(quantization[s]))
>>
>> No, no, no; never use a bare except! :)
>
> can you explain why?  i can't think of any reason why the code would be
> better catching a specific exception.
>
> as a general rule, maybe, but in this particular case i can't see a reason
> - so i'm not sure if you're just pedantically following rules or if i've
> missed something i should know.

What if the user pressed ctl-c right when the float was being converted
and appended?

Never use a bare except unless you have a specific reason to do so,
and there are very few of those.  (Yes, I should have said it that way
to start with, my apologies for going hyperbolic.)  Using because it
doesn't _look_ like it will cause issues is just asking for hard to
track down bugs :).

--
R. David Murray             http://www.bitdance.com



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