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[3.13] gh-120521: clarify except* documentation to allow tuples (GH-120523) (#120750) 

(cherry picked from commit 58b3f11176)

Co-authored-by: Danny Yang <yangdanny97@users.noreply.github.com>
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
Co-authored-by: Irit Katriel <1055913+iritkatriel@users.noreply.github.com>
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Miss Islington (bot) 2024-06-19 21:07:04 +02:00 committed by GitHub
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19
Doc/reference/compound_stmts.rst
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@ -245,13 +245,12 @@ handler is started. This search inspects the :keyword:`!except` clauses in turn
until one is found that matches the exception.
An expression-less :keyword:`!except` clause, if present, must be last;
it matches any exception.
For an :keyword:`!except` clause with an expression,
that expression is evaluated, and the clause matches the exception
if the resulting object is "compatible" with the exception. An object is
compatible with an exception if the object is the class or a
:term:`non-virtual base class <abstract base class>` of the exception object,
or a tuple containing an item that is the class or a non-virtual base class
of the exception object.
For an :keyword:`!except` clause with an expression, the
expression must evaluate to an exception type or a tuple of exception types.
The raised exception matches an :keyword:`!except` clause whose expression evaluates
to the class or a :term:`non-virtual base class <abstract base class>` of the exception object,
or to a tuple that contains such a class.
If no :keyword:`!except` clause matches the exception,
the search for an exception handler
@ -378,8 +377,10 @@ exception group with an empty message string. ::
...
ExceptionGroup('', (BlockingIOError()))
An :keyword:`!except*` clause must have a matching type,
and this type cannot be a subclass of :exc:`BaseExceptionGroup`.
An :keyword:`!except*` clause must have a matching expression; it cannot be ``except*:``.
Furthermore, this expression cannot contain exception group types, because that would
have ambiguous semantics.
It is not possible to mix :keyword:`except` and :keyword:`!except*`
in the same :keyword:`try`.
:keyword:`break`, :keyword:`continue` and :keyword:`return`