[issue30871] Add a "python info" command somewhere to dump versions of all dependencies

[STINNER Victor]

STINNER Victor added the comment:

I created https://github.com/python/cpython/pull/3120 to add "make pythoninfo" because it's more tricky than what I expected to run "./python -m test.pythoninfo" on buildbots. Depending if Python is built with shared library, depending on the OS (./python, or ./python.exe for macOS?), ... the command is different.

I plan to backport Lib/test/pythoninfo.py and "make pythoninfo" to Python 2.7 and 3.6 to ease debug on all supported Python branches.

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versions: +Python 2.7, Python 3.6

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<http://bugs.python.org/issue30871>
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