[Python-Dev] (try-except) conditional expression similar to (if-else) conditional (PEP 308)
python at mrabarnett.plus.com
Fri Aug 7 13:03:16 CEST 2009
Jeff McAninch wrote:
> Should be legal, right?, since syntax would be
> <expression> except <expression> if <exception>
> Dino Viehland wrote:
>> On option 1 is this legal then?
>> x = float(string) except float('nan') if some_check() else
>> float('inf') if ValueError
> Thinking more about the syntax options: if P.J.'s "if" Option is used,
> it should also be optional.
> That is, I would want this to also be legal,
> <expression> except <expression>
> to trap any exception when robustness is more important than catching a
> specific exception.
Catch all exceptions:
<expression> except <expression>
Catch specific exceptions, optionally catching all others:
<expression> except (<expression> if <exception>)+ [else <expression>]
Of course, a catch-all is a bare except, with all its dangers!
> What would be the typical next step in trying to put this forward? A
> draft PEP?
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