Raising an exception in the caller's frame
Thomas Heller
theller at python.net
Fri Mar 21 08:12:06 EST 2003
Alex Martelli <aleax at aleax.it> writes:
> Thomas Heller wrote:
> ...
> > Hopefully I can explain it: check_result() is not the 'cause' of the
> > error, it's purpose is simply to detect the error. The 'exception'
> > really occurrs in dosomething().
>
> Yes, your purpose is very clear to me and I agree there _should_
> be a way to achieve it, but I can't think of one.
>
>
The best I came up with so far is to *return* an exception
instead of raising it, and do a typecheck in the caller:
def check_result(value):
if somecondition(value):
return ValueError(value) # or whatever
return value
def do_some_work():
value = dosomething()
result = check_result(value)
if isinstance(result, Exception):
raise result
return result
Thomas
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