cpython version

[Larry Martell]

For the first time in my 30+ year career I am, unfortunately, working
on Windows.  A package I need, rpy2, comes in various flavors for
different cpython versions:

rpy2‑2.7.8‑cp27‑none‑win32.whl
rpy2‑2.7.8‑cp27‑none‑win_amd64.whl
rpy2‑2.7.8‑cp34‑none‑win32.whl
rpy2‑2.7.8‑cp34‑none‑win_amd64.whl
rpy2‑2.7.8‑cp35‑none‑win32.whl
rpy2‑2.7.8‑cp35‑none‑win_amd64.whl
rpy2‑2.8.6‑cp35‑cp35m‑win32.whl
rpy2‑2.8.6‑cp35‑cp35m‑win_amd64.whl
rpy2‑2.8.6‑cp36‑cp36m‑win32.whl
rpy2‑2.8.6‑cp36‑cp36m‑win_amd64.whl

I am running python version 2.7.13. How can I find out my cpython version?