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bpo-35790: Correct the description of sys.exc_info() and add a code example (GH-11625)

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Géry Ogam 2020-12-21 14:13:08 +01:00 committed by GitHub
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Doc/reference/compound_stmts.rst
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@ -302,9 +302,27 @@ Before an except clause's suite is executed, details about the exception are
stored in the :mod:`sys` module and can be accessed via :func:`sys.exc_info`.
:func:`sys.exc_info` returns a 3-tuple consisting of the exception class, the
exception instance and a traceback object (see section :ref:`types`) identifying
the point in the program where the exception occurred. :func:`sys.exc_info`
values are restored to their previous values (before the call) when returning
from a function that handled an exception.
the point in the program where the exception occurred. The details about the
exception accessed via :func:`sys.exc_info` are restored to their previous values
when leaving an exception handler::
>>> print(sys.exc_info())
(None, None, None)
>>> try:
... raise TypeError
... except:
... print(sys.exc_info())
... try:
... raise ValueError
... except:
... print(sys.exc_info())
... print(sys.exc_info())
...
(<class 'TypeError'>, TypeError(), <traceback object at 0x10efad080>)
(<class 'ValueError'>, ValueError(), <traceback object at 0x10efad040>)
(<class 'TypeError'>, TypeError(), <traceback object at 0x10efad080>)
>>> print(sys.exc_info())
(None, None, None)
.. index::
keyword: else