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Document the surprising sideeffect PyErr_Print(). #12081

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Feb 27, 2019
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Document the surprising sideeffect PyErr_Print(). #12081

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8 changes: 6 additions & 2 deletions Doc/c-api/exceptions.rst
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Expand Up @@ -53,8 +53,12 @@ Printing and clearing
.. c:function:: void PyErr_PrintEx(int set_sys_last_vars)

Print a standard traceback to ``sys.stderr`` and clear the error indicator.
Call this function only when the error indicator is set. (Otherwise it will
cause a fatal error!)
**Unless** the error is a ``SystemExit``. In that case the no traceback
is printed and Python process will exit with the error code specified by
the ``SystemExit`` instance.

Call this function **only** when the error indicator is set. Otherwise it
will cause a fatal error!

If *set_sys_last_vars* is nonzero, the variables :data:`sys.last_type`,
:data:`sys.last_value` and :data:`sys.last_traceback` will be set to the
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