Steve Barnes added the comment:
If this option is added into the py launcher it will make it usable for a
multipy script/utility that would call py -0 to get a list of installed pythons
and then call it for each of the returned versions with the remaining
parameters.
I personally would find this very useful for things like:
multipy -m pip install --upgrade matplotlib
so as to install upgrades to all of the system pythons.
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<http://bugs.python.org/issue30362>
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