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PEP 654: add number of sub-exceptions to BaseException.__str__ #2356

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Feb 22, 2022
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PEP 654: add number of sub-exceptions to BaseException.__str__ #2356

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55 changes: 28 additions & 27 deletions pep-0654.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -186,30 +186,31 @@ contains only those exceptions for which the condition is true:
... )
... ]
... )
>>> import traceback
>>> traceback.print_exception(eg)
| ExceptionGroup: one
| ExceptionGroup: one (3 sub-exceptions)
+-+---------------- 1 ----------------
| TypeError: 1
+---------------- 2 ----------------
| ExceptionGroup: two
| ExceptionGroup: two (2 sub-exceptions)
+-+---------------- 1 ----------------
| TypeError: 2
+---------------- 2 ----------------
| ValueError: 3
+------------------------------------
+---------------- 3 ----------------
| ExceptionGroup: three
| ExceptionGroup: three (1 sub-exception)
+-+---------------- 1 ----------------
| OSError: 4
+------------------------------------

>>> type_errors = eg.subgroup(lambda e: isinstance(e, TypeError))
>>> traceback.print_exception(type_errors)
| ExceptionGroup: one
| ExceptionGroup: one (2 sub-exceptions)
+-+---------------- 1 ----------------
| TypeError: 1
+---------------- 2 ----------------
| ExceptionGroup: two
| ExceptionGroup: two (1 sub-exception)
+-+---------------- 1 ----------------
| TypeError: 2
+------------------------------------
Expand Down Expand Up @@ -240,23 +241,23 @@ If both the subgroup and its complement are needed, the

>>> type_errors, other_errors = eg.split(lambda e: isinstance(e, TypeError))
>>> traceback.print_exception(type_errors)
| ExceptionGroup: one
| ExceptionGroup: one (2 sub-exceptions)
+-+---------------- 1 ----------------
| TypeError: 1
+---------------- 2 ----------------
| ExceptionGroup: two
| ExceptionGroup: two (1 sub-exception)
+-+---------------- 1 ----------------
| TypeError: 2
+------------------------------------
>>> traceback.print_exception(other_errors)
| ExceptionGroup: one
| ExceptionGroup: one (2 sub-exceptions)
+-+---------------- 1 ----------------
| ExceptionGroup: two
| ExceptionGroup: two (1 sub-exception)
+-+---------------- 1 ----------------
| ValueError: 3
+------------------------------------
+---------------- 2 ----------------
| ExceptionGroup: three
| ExceptionGroup: three (1 sub-exception)
+-+---------------- 1 ----------------
| OSError: 4
+------------------------------------
Expand Down Expand Up @@ -387,15 +388,15 @@ in the following example:
>>> raise ExceptionGroup("two", [f(2), eg])
+ Exception Group Traceback (most recent call last):
| File "<stdin>", line 1, in <module>
| ExceptionGroup: two
| ExceptionGroup: two (2 sub-exceptions)
+-+---------------- 1 ----------------
| Traceback (most recent call last):
| File "<stdin>", line 3, in f
| ValueError: 2
+---------------- 2 ----------------
| Exception Group Traceback (most recent call last):
| File "<stdin>", line 2, in <module>
| ExceptionGroup: one
| ExceptionGroup: one (1 sub-exception)
+-+---------------- 1 ----------------
| Traceback (most recent call last):
| File "<stdin>", line 3, in f
Expand Down Expand Up @@ -802,29 +803,29 @@ merged with the unhandled ``TypeErrors``.
...
*ValueError: ExceptionGroup('eg', [ValueError(1), ExceptionGroup('nested', [ValueError(6)])])
*OSError: ExceptionGroup('eg', [OSError(3), ExceptionGroup('nested', [OSError(4)])])
| ExceptionGroup
| ExceptionGroup: (2 sub-exceptions)
+-+---------------- 1 ----------------
| Exception Group Traceback (most recent call last):
| File "<stdin>", line 15, in <module>
| File "<stdin>", line 2, in <module>
| ExceptionGroup: eg
| ExceptionGroup: eg (2 sub-exceptions)
+-+---------------- 1 ----------------
| ValueError: 1
+---------------- 2 ----------------
| ExceptionGroup: nested
| ExceptionGroup: nested (1 sub-exception)
+-+---------------- 1 ----------------
| ValueError: 6
+------------------------------------
+---------------- 2 ----------------
| Exception Group Traceback (most recent call last):
| File "<stdin>", line 2, in <module>
| ExceptionGroup: eg
| ExceptionGroup: eg (3 sub-exceptions)
+-+---------------- 1 ----------------
| TypeError: 2
+---------------- 2 ----------------
| OSError: 3
+---------------- 3 ----------------
| ExceptionGroup: nested
| ExceptionGroup: nested (2 sub-exceptions)
+-+---------------- 1 ----------------
| OSError: 4
+---------------- 2 ----------------
Expand All @@ -848,11 +849,11 @@ it into the new ``ExceptionGroup``.
... except* ValueError:
... raise ExceptionGroup("two", [KeyError('x'), KeyError('y')])
...
| ExceptionGroup
| ExceptionGroup: (2 sub-exceptions)
+-+---------------- 1 ----------------
| Exception Group Traceback (most recent call last):
| File "<stdin>", line 2, in <module>
| ExceptionGroup: one
| ExceptionGroup: one (1 sub-exception)
+-+---------------- 1 ----------------
| ValueError: a
+------------------------------------
Expand All @@ -861,7 +862,7 @@ it into the new ``ExceptionGroup``.
|
| Exception Group Traceback (most recent call last):
| File "<stdin>", line 4, in <module>
| ExceptionGroup: two
| ExceptionGroup: two (2 sub-exceptions)
+-+---------------- 1 ----------------
| KeyError: 'x'
+---------------- 2 ----------------
Expand All @@ -870,7 +871,7 @@ it into the new ``ExceptionGroup``.
+---------------- 2 ----------------
| Exception Group Traceback (most recent call last):
| File "<stdin>", line 2, in <module>
| ExceptionGroup: one
| ExceptionGroup: one (1 sub-exception)
+-+---------------- 1 ----------------
| TypeError: b
+------------------------------------
Expand All @@ -891,7 +892,7 @@ chaining:
... except* TypeError as e:
... raise ValueError('bad value') from e
...
| ExceptionGroup
| ExceptionGroup: (1 sub-exception)
+-+---------------- 1 ----------------
| Traceback (most recent call last):
| File "<stdin>", line 2, in <module>
Expand Down Expand Up @@ -937,11 +938,11 @@ direct child of the new exception group created for that:
... except* ValueError:
... raise KeyError('x')
...
| ExceptionGroup
| ExceptionGroup: (1 sub-exception)
+-+---------------- 1 ----------------
| Exception Group Traceback (most recent call last):
| File "<stdin>", line 2, in <module>
| ExceptionGroup: eg
| ExceptionGroup: eg (1 sub-exception)
+-+---------------- 1 ----------------
| ValueError: a
+------------------------------------
Expand All @@ -958,11 +959,11 @@ direct child of the new exception group created for that:
... except* ValueError:
... raise KeyError('x')
...
| ExceptionGroup
| ExceptionGroup: (2 sub-exceptions)
+-+---------------- 1 ----------------
| Exception Group Traceback (most recent call last):
| File "<stdin>", line 2, in <module>
| ExceptionGroup: eg
| ExceptionGroup: eg (1 sub-exception)
+-+---------------- 1 ----------------
| ValueError: a
+------------------------------------
Expand All @@ -975,7 +976,7 @@ direct child of the new exception group created for that:
+---------------- 2 ----------------
| Exception Group Traceback (most recent call last):
| File "<stdin>", line 2, in <module>
| ExceptionGroup: eg
| ExceptionGroup: eg (1 sub-exception)
+-+---------------- 1 ----------------
| TypeError: b
+------------------------------------
Expand Down