bpo-35790: Correct the description of sys.exc_info() and add a code example (GH-11625)
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@ -302,9 +302,27 @@ Before an except clause's suite is executed, details about the exception are
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stored in the :mod:`sys` module and can be accessed via :func:`sys.exc_info`.
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:func:`sys.exc_info` returns a 3-tuple consisting of the exception class, the
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exception instance and a traceback object (see section :ref:`types`) identifying
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the point in the program where the exception occurred. :func:`sys.exc_info`
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values are restored to their previous values (before the call) when returning
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from a function that handled an exception.
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the point in the program where the exception occurred. The details about the
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exception accessed via :func:`sys.exc_info` are restored to their previous values
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when leaving an exception handler::
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>>> print(sys.exc_info())
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(None, None, None)
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>>> try:
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... raise TypeError
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... except:
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... print(sys.exc_info())
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... try:
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... raise ValueError
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... except:
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... print(sys.exc_info())
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... print(sys.exc_info())
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...
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(<class 'TypeError'>, TypeError(), <traceback object at 0x10efad080>)
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(<class 'ValueError'>, ValueError(), <traceback object at 0x10efad040>)
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(<class 'TypeError'>, TypeError(), <traceback object at 0x10efad080>)
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>>> print(sys.exc_info())
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(None, None, None)
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.. index::
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keyword: else
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