Python 3.7.0a4 is the last of four planned alpha releases of Python 3.7,
the next feature release of Python. During the alpha phase, Python 3.7
remains under heavy development: additional features will be added
and existing features may be modified or deleted. Please keep in mind
that this is a preview release and its use is not recommended for
production environments. The next preview release, 3.7.0b1, is planned
for 2018-01-29. You can find Python 3.7.0a4 and more information here:
Python core development news and information.