Steven D'Aprano wrote:
Right. But I have thought of a clever trick to get the result KJ was
asking for, with the minimum of boilerplate code. Instead of this:
def _pre_spam(args):
if condition(args):
raise SomeException("message")
if another_condition(args):
raise AnotherException("message")
if third_condition(args):
raise ThirdException("message")
def spam(args):
_pre_spam(args)
do_useful_work()
you can return the exceptions instead of raising them (exceptions are
just objects, like everything else!), and then add one small piece of
boilerplate to the spam() function:
def _pre_spam(args):
if condition(args):
return SomeException("message")
if another_condition(args):
return AnotherException("message")
if third_condition(args):
return ThirdException("message")
def spam(args):
exc = _pre_spam(args)
if exc: raise exc
do_useful_work()
-1
You failed to mention that cleverness is not a prime requisite of the
python programmer -- in fact, it's usually frowned upon. The big
problem with the above code is you are back to passing errors in-band,
pretty much completely defeating the point of have an out-of-band channel.
~Ethan~
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