Éric Araujo added the comment:

IIRC, when the tarfile module CLI was added, there was a decision to keep it 
short and simple, not mimic the whole tar(1) interface.

Python core ships with modules that should be featurefull, but we don’t put 
much focus or effort on general utilities: the only globally installed scripts 
are directly useful to Python devs (idle, pydoc, pyvenv, 2to3); the stdlib 
modules with a CLI are quick helpers (python -m SimpleHTTPServer) or smoke 
tests or demos IIRC; Tools/scripts have an even lower level of usefulness and 
maintenance.

I sympathize with the use case of finding missing pieces in tarfile, but I’m 
wary about the maintenance burden (code maintenance if it matches tar(1) fully, 
support if it does not, endless discussions about installing it on Windows like 
what happened for Tools/scripts/diff.py, etc).

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nosy: +eric.araujo

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<http://bugs.python.org/issue21550>
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