[issue29400] Add instruction level tracing via sys.settrace

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


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stage:  -> test needed
title: Instruction level tracing via sys.settrace -> Add instruction level tracing via sys.settrace
versions: +Python 3.7 -Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29400>
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