[Python-ideas] Fwd: Null coalescing operator

[Rob Cliffe]

On 12/09/2016 16:37, Guido van Rossum wrote:
> For the record, I still really don't like PEP 463. We should strive to
> catch fewer exceptions, not make it easier to catch them.
Can you please clarify what you are saying in the last sentence?
The first time I read it, my brain parsed it as "People should raise 
fewer exceptions, i.e. use LBYL less".
Later it seemed more likely that you meant "The set of exceptions we 
catch in a specific piece of code should not be too large; we should 
only catch those exceptions that we really mean to handle".
But perhaps you mean something else altogether?

Also I don't see the connection between the first sentence and the 
second.  Exception-catching expressions as per PEP 463 just give you a 
more concise way of of doing something you can do with try+except.  Do 
you mean it would make it easier to catch exceptions because you have to 
type fewer characters, and that this would be a bad thing?
Thanks,
Rob Cliffe