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Commit4d3bc89

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gh-102011: use sys.exception() instead of sys.exc_info() in docs where possible (#102012)
1 parent36854bb commit4d3bc89

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6 files changed

+29
-32
lines changed

6 files changed

+29
-32
lines changed

‎Doc/library/exceptions.rst‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -123,7 +123,7 @@ The following exceptions are used mostly as base classes for other exceptions.
123123
try:
124124
...
125125
except SomeException:
126-
tb = sys.exc_info()[2]
126+
tb = sys.exception().__traceback__
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raise OtherException(...).with_traceback(tb)
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129129
..method::add_note(note)

‎Doc/library/traceback.rst‎

Lines changed: 10 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -16,9 +16,8 @@ interpreter.
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..index::object: traceback
1818

19-
The module uses traceback objects --- this is the object type that is stored in
20-
the:data:`sys.last_traceback` variable and returned as the third item from
21-
:func:`sys.exc_info`.
19+
The module uses traceback objects --- these are objects of type:class:`types.TracebackType`,
20+
which are assigned to the ``__traceback__`` field of:class:`BaseException` instances.
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2322
..seealso::
2423

@@ -81,7 +80,7 @@ The module defines the following functions:
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8281
..function::print_exc(limit=None, file=None, chain=True)
8382

84-
This is a shorthand for ``print_exception(*sys.exc_info(), limit, file,
83+
This is a shorthand for ``print_exception(sys.exception(), limit, file,
8584
chain)``.
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8786

@@ -444,24 +443,24 @@ exception and traceback:
444443
try:
445444
lumberjack()
446445
except IndexError:
447-
exc_type, exc_value, exc_traceback= sys.exc_info()
446+
exc= sys.exception()
448447
print("*** print_tb:")
449-
traceback.print_tb(exc_traceback, limit=1, file=sys.stdout)
448+
traceback.print_tb(exc.__traceback__, limit=1, file=sys.stdout)
450449
print("*** print_exception:")
451-
traceback.print_exception(exc_value, limit=2, file=sys.stdout)
450+
traceback.print_exception(exc, limit=2, file=sys.stdout)
452451
print("*** print_exc:")
453452
traceback.print_exc(limit=2, file=sys.stdout)
454453
print("*** format_exc, first and last line:")
455454
formatted_lines = traceback.format_exc().splitlines()
456455
print(formatted_lines[0])
457456
print(formatted_lines[-1])
458457
print("*** format_exception:")
459-
print(repr(traceback.format_exception(exc_value)))
458+
print(repr(traceback.format_exception(exc)))
460459
print("*** extract_tb:")
461-
print(repr(traceback.extract_tb(exc_traceback)))
460+
print(repr(traceback.extract_tb(exc.__traceback__)))
462461
print("*** format_tb:")
463-
print(repr(traceback.format_tb(exc_traceback)))
464-
print("*** tb_lineno:",exc_traceback.tb_lineno)
462+
print(repr(traceback.format_tb(exc.__traceback__)))
463+
print("*** tb_lineno:",exc.__traceback__.tb_lineno)
465464

466465
The output for the example would look similar to this:
467466

‎Doc/library/types.rst‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -320,7 +320,7 @@ Standard names are defined for the following types:
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321321
..class::TracebackType(tb_next, tb_frame, tb_lasti, tb_lineno)
322322

323-
The type of traceback objects such as found in ``sys.exc_info()[2]``.
323+
The type of traceback objects such as found in ``sys.exception().__traceback__``.
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See:ref:`the language reference<traceback-objects>` for details of the
326326
available attributes and operations, and guidance on creating tracebacks

‎Doc/library/wsgiref.rst‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -674,7 +674,7 @@ input, output, and error streams.
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This method is a WSGI application to generate an error page for the user. It is
675675
only invoked if an error occurs before headers are sent to the client.
676676

677-
This method can access the current errorinformationusing ``sys.exc_info()``,
677+
This method can access the current error using ``sys.exception()``,
678678
and should pass that information to *start_response* when calling it (as
679679
described in the "Error Handling" section of:pep:`3333`).
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‎Doc/reference/compound_stmts.rst‎

Lines changed: 15 additions & 18 deletions
Original file line numberDiff line numberDiff line change
@@ -301,31 +301,28 @@ keeping all locals in that frame alive until the next garbage collection occurs.
301301
object: traceback
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303303
Before an:keyword:`!except` clause's suite is executed,
304-
details about the exception are
305-
stored in the:mod:`sys` module and can be accessed via:func:`sys.exc_info`.
306-
:func:`sys.exc_info` returns a 3-tuple consisting of the exception class, the
307-
exception instance and a traceback object (see section:ref:`types`) identifying
308-
the point in the program where the exception occurred. The details about the
309-
exception accessed via:func:`sys.exc_info` are restored to their previous values
310-
when leaving an exception handler::
311-
312-
>>> print(sys.exc_info())
313-
(None, None, None)
304+
the exception is stored in the:mod:`sys` module, where it can be accessed
305+
from within the body of the:keyword:`!except` clause by calling
306+
:func:`sys.exception`. When leaving an exception handler, the exception
307+
stored in the:mod:`sys` module is reset to its previous value::
308+
309+
>>> print(sys.exception())
310+
None
314311
>>> try:
315312
... raise TypeError
316313
... except:
317-
... print(sys.exc_info())
314+
... print(repr(sys.exception()))
318315
... try:
319316
... raise ValueError
320317
... except:
321-
... print(sys.exc_info())
322-
... print(sys.exc_info())
318+
... print(repr(sys.exception()))
319+
... print(repr(sys.exception()))
323320
...
324-
(<class 'TypeError'>, TypeError(), <traceback object at 0x10efad080>)
325-
(<class 'ValueError'>, ValueError(), <traceback object at 0x10efad040>)
326-
(<class 'TypeError'>, TypeError(), <traceback object at 0x10efad080>)
327-
>>> print(sys.exc_info())
328-
(None, None, None)
321+
TypeError()
322+
ValueError()
323+
TypeError()
324+
>>> print(sys.exception())
325+
None
329326

330327

331328
..index::

‎Doc/reference/datamodel.rst‎

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1122,6 +1122,7 @@ Internal types
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single: exc_info (in module sys)
11231123
single: last_traceback (in module sys)
11241124
single: sys.exc_info
1125+
single: sys.exception
11251126
single: sys.last_traceback
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11271128
Traceback objects represent a stack trace of an exception. A traceback object

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