PEP-654: add number of sub-exceptions to BaseException.__str__ (GH-2356)
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Irit Katriel
GitHub
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pep-0654.rst
55
pep-0654.rst
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@ -186,30 +186,31 @@ contains only those exceptions for which the condition is true:
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... )
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... ]
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... )
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>>> import traceback
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>>> traceback.print_exception(eg)
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| ExceptionGroup: one
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| ExceptionGroup: one (3 sub-exceptions)
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+-+---------------- 1 ----------------
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| TypeError: 1
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+---------------- 2 ----------------
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| ExceptionGroup: two
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| ExceptionGroup: two (2 sub-exceptions)
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+-+---------------- 1 ----------------
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| TypeError: 2
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+---------------- 2 ----------------
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| ValueError: 3
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+------------------------------------
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+---------------- 3 ----------------
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| ExceptionGroup: three
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| ExceptionGroup: three (1 sub-exception)
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+-+---------------- 1 ----------------
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| OSError: 4
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+------------------------------------
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>>> type_errors = eg.subgroup(lambda e: isinstance(e, TypeError))
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>>> traceback.print_exception(type_errors)
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| ExceptionGroup: one
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| ExceptionGroup: one (2 sub-exceptions)
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+-+---------------- 1 ----------------
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| TypeError: 1
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+---------------- 2 ----------------
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| ExceptionGroup: two
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| ExceptionGroup: two (1 sub-exception)
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+-+---------------- 1 ----------------
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| TypeError: 2
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+------------------------------------
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@ -240,23 +241,23 @@ If both the subgroup and its complement are needed, the
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>>> type_errors, other_errors = eg.split(lambda e: isinstance(e, TypeError))
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>>> traceback.print_exception(type_errors)
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| ExceptionGroup: one
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| ExceptionGroup: one (2 sub-exceptions)
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+-+---------------- 1 ----------------
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| TypeError: 1
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+---------------- 2 ----------------
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| ExceptionGroup: two
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| ExceptionGroup: two (1 sub-exception)
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+-+---------------- 1 ----------------
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| TypeError: 2
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+------------------------------------
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>>> traceback.print_exception(other_errors)
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| ExceptionGroup: one
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| ExceptionGroup: one (2 sub-exceptions)
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+-+---------------- 1 ----------------
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| ExceptionGroup: two
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| ExceptionGroup: two (1 sub-exception)
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+-+---------------- 1 ----------------
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| ValueError: 3
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+------------------------------------
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+---------------- 2 ----------------
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| ExceptionGroup: three
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| ExceptionGroup: three (1 sub-exception)
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+-+---------------- 1 ----------------
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| OSError: 4
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+------------------------------------
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@ -387,7 +388,7 @@ in the following example:
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>>> raise ExceptionGroup("two", [f(2), eg])
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+ Exception Group Traceback (most recent call last):
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| File "<stdin>", line 1, in <module>
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| ExceptionGroup: two
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| ExceptionGroup: two (2 sub-exceptions)
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+-+---------------- 1 ----------------
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| Traceback (most recent call last):
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| File "<stdin>", line 3, in f
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@ -395,7 +396,7 @@ in the following example:
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+---------------- 2 ----------------
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| Exception Group Traceback (most recent call last):
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| File "<stdin>", line 2, in <module>
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| ExceptionGroup: one
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| ExceptionGroup: one (1 sub-exception)
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+-+---------------- 1 ----------------
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| Traceback (most recent call last):
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| File "<stdin>", line 3, in f
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@ -802,29 +803,29 @@ merged with the unhandled ``TypeErrors``.
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...
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*ValueError: ExceptionGroup('eg', [ValueError(1), ExceptionGroup('nested', [ValueError(6)])])
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*OSError: ExceptionGroup('eg', [OSError(3), ExceptionGroup('nested', [OSError(4)])])
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| ExceptionGroup
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| ExceptionGroup: (2 sub-exceptions)
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+-+---------------- 1 ----------------
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| Exception Group Traceback (most recent call last):
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| File "<stdin>", line 15, in <module>
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| File "<stdin>", line 2, in <module>
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| ExceptionGroup: eg
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| ExceptionGroup: eg (2 sub-exceptions)
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+-+---------------- 1 ----------------
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| ValueError: 1
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+---------------- 2 ----------------
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| ExceptionGroup: nested
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| ExceptionGroup: nested (1 sub-exception)
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+-+---------------- 1 ----------------
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| ValueError: 6
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+------------------------------------
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+---------------- 2 ----------------
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| Exception Group Traceback (most recent call last):
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| File "<stdin>", line 2, in <module>
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| ExceptionGroup: eg
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| ExceptionGroup: eg (3 sub-exceptions)
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+-+---------------- 1 ----------------
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| TypeError: 2
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+---------------- 2 ----------------
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| OSError: 3
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+---------------- 3 ----------------
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| ExceptionGroup: nested
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| ExceptionGroup: nested (2 sub-exceptions)
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+-+---------------- 1 ----------------
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| OSError: 4
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+---------------- 2 ----------------
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@ -848,11 +849,11 @@ it into the new ``ExceptionGroup``.
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... except* ValueError:
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... raise ExceptionGroup("two", [KeyError('x'), KeyError('y')])
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...
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| ExceptionGroup
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| ExceptionGroup: (2 sub-exceptions)
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+-+---------------- 1 ----------------
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| Exception Group Traceback (most recent call last):
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| File "<stdin>", line 2, in <module>
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| ExceptionGroup: one
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| ExceptionGroup: one (1 sub-exception)
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+-+---------------- 1 ----------------
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| ValueError: a
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+------------------------------------
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@ -861,7 +862,7 @@ it into the new ``ExceptionGroup``.
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| Exception Group Traceback (most recent call last):
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| File "<stdin>", line 4, in <module>
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| ExceptionGroup: two
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| ExceptionGroup: two (2 sub-exceptions)
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+-+---------------- 1 ----------------
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| KeyError: 'x'
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+---------------- 2 ----------------
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@ -870,7 +871,7 @@ it into the new ``ExceptionGroup``.
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+---------------- 2 ----------------
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| Exception Group Traceback (most recent call last):
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| File "<stdin>", line 2, in <module>
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| ExceptionGroup: one
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| ExceptionGroup: one (1 sub-exception)
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+-+---------------- 1 ----------------
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| TypeError: b
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+------------------------------------
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@ -891,7 +892,7 @@ chaining:
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... except* TypeError as e:
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... raise ValueError('bad value') from e
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...
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| ExceptionGroup
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| ExceptionGroup: (1 sub-exception)
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+-+---------------- 1 ----------------
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| Traceback (most recent call last):
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| File "<stdin>", line 2, in <module>
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@ -937,11 +938,11 @@ direct child of the new exception group created for that:
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... except* ValueError:
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... raise KeyError('x')
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...
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| ExceptionGroup
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| ExceptionGroup: (1 sub-exception)
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+-+---------------- 1 ----------------
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| Exception Group Traceback (most recent call last):
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| File "<stdin>", line 2, in <module>
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| ExceptionGroup: eg
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| ExceptionGroup: eg (1 sub-exception)
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+-+---------------- 1 ----------------
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| ValueError: a
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+------------------------------------
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@ -958,11 +959,11 @@ direct child of the new exception group created for that:
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... except* ValueError:
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... raise KeyError('x')
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...
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| ExceptionGroup
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| ExceptionGroup: (2 sub-exceptions)
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+-+---------------- 1 ----------------
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| Exception Group Traceback (most recent call last):
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| File "<stdin>", line 2, in <module>
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| ExceptionGroup: eg
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| ExceptionGroup: eg (1 sub-exception)
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+-+---------------- 1 ----------------
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| ValueError: a
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+------------------------------------
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@ -975,7 +976,7 @@ direct child of the new exception group created for that:
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+---------------- 2 ----------------
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| Exception Group Traceback (most recent call last):
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| File "<stdin>", line 2, in <module>
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| ExceptionGroup: eg
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| ExceptionGroup: eg (1 sub-exception)
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+-+---------------- 1 ----------------
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| TypeError: b
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+------------------------------------
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