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[3.9] bpo-12029: [doc] clarify that except does not match virtual subclasses of the specified exception type (GH-32027) #32035

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Mar 21, 2022
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[3.9] bpo-12029: [doc] clarify that except does not match virtual subclasses of the specified exception type (GH-32027) #32035

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7 changes: 4 additions & 3 deletions Doc/reference/compound_stmts.rst
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Expand Up @@ -253,9 +253,10 @@ is found that matches the exception. An expression-less except clause, if
present, must be last; it matches any exception. For an 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 it is the class or a base class of the exception
object, or a tuple containing an item that is the class or a base class of
the exception object.
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.

If no except clause matches the exception, the search for an exception handler
continues in the surrounding code and on the invocation stack. [#]_
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5 changes: 3 additions & 2 deletions Doc/reference/executionmodel.rst
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Expand Up @@ -249,8 +249,9 @@ a stack traceback, except when the exception is :exc:`SystemExit`.

Exceptions are identified by class instances. The :keyword:`except` clause is
selected depending on the class of the instance: it must reference the class of
the instance or a base class thereof. The instance can be received by the
handler and can carry additional information about the exceptional condition.
the instance or a :term:`non-virtual base class <abstract base class>` thereof.
The instance can be received by the handler and can carry additional information
about the exceptional condition.

.. note::

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