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PEP-654: state that interior nodes are checked for match in subgroup/… #2113

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Oct 19, 2021
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PEP-654: state that interior nodes are checked for match in subgroup/… #2113

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6 changes: 5 additions & 1 deletion pep-0654.rst
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Expand Up @@ -218,9 +218,13 @@ contains only those exceptions for which the condition is true:
>>>


The match condition is also applied to interior nodes (the exception
groups), and a match causes the whole subtree rooted at this node
to be included in the result.

Empty nested groups are omitted from the result, as in the
case of ``ExceptionGroup("three")`` in the example above. If none of the
leaf exceptions match the condition, ``subgroup`` returns ``None`` rather
exceptions match the condition, ``subgroup`` returns ``None`` rather
than an empty group. The original ``eg``
is unchanged by ``subgroup``, but the value returned is not necessarily a full
new copy. Leaf exceptions are not copied, nor are exception groups which are
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