[Python-Dev] Re-raise in absence of an "active" exception

[Jeremy Hylton]

On Fri, 2004-06-25 at 05:20, Alex Martelli wrote:
> On 2004 Jun 24, at 17:15, Jeremy Hylton wrote:
> 
> > On Mon, 2004-06-21 at 01:22, "Martin v. Löwis" wrote:
> >> "If no exception is active in the current scope, an exception is 
> >> raised
> >> indicating this error."
> >>
> >> "This" error probably being "no active exception", not "exception must
> >> not be NoneType".
> >
> > We can determine statically whether an exception would active in the
> > current scope, right?  If the raise does not occur within an except
> > handler, then there is no active exception in the current scope.  I
> > think it should be a SyntaxError.
> 
> Isn't the "raise" allowed to occur in a function that may be _called 
> from_ an except handler? E.g.:
> 
>  >>> def foo():
> ...     print "do something here"
> ...     raise
> ...
>  >>> try: 1/0
> ... except Exception: foo()

The definition of what it means for an exception to be "active" in a
scope needs to be clarified.  The language reference doesn't appear to
define what that means, so I took a narrow reading.  I think the code
you mention later in your post is code I wrote :-).

Jeremy