There has been discussion about the release cadence of Python for a couple
of years now. The 18-month cycle between major releases of the language
is seen by some core developers as causing
too much
delay in getting new features into the hands of users. Now there are two
competing proposals for ways to shorten that cycle, either to one year or
by creating a rolling-release model. In general, the steering council
has seemed inclined toward making some kind of release-cycle change—one of
those Python Enhancement Proposals (PEPs) may well form the basis of
Python’s release cadence moving forward.

Source: LWN.net – [$] Changing the Python release cadence