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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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30362>
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