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2 changes: 1 addition & 1 deletion Doc/library/sys.rst
Original file line number Diff line number Diff line change
Expand Up @@ -1764,7 +1764,7 @@ always available. Unless explicitly noted otherwise, all variables are read-only
:func:`settrace` for each thread being debugged or use :func:`threading.settrace`.

Trace functions should have three arguments: *frame*, *event*, and
*arg*. *frame* is the current stack frame. *event* is a string: ``'call'``,
*arg*. *frame* is the :ref:`current stack frame <frame-objects>`. *event* is a string: ``'call'``,
``'line'``, ``'return'``, ``'exception'`` or ``'opcode'``. *arg* depends on
the event type.

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