The 3.6.1rc1 build seems to have a spurious "^0" at the end of the version, before the VCS ID - 3.6.1rc1^0):

>py -3.6
Python 3.6.1rc1 (v3.6.1rc1^0:e0fbe5feee4f9c00f09eb9659c2182183036261a, Mar  4 2017, 20:00:12) [MSC v.1900 64 bit (AMD64)] on win32
>>> sys.version
'3.6.1rc1 (v3.6.1rc1^0:e0fbe5feee4f9c00f09eb9659c2182183036261a, Mar  4 2017, 20:00:12) [MSC v.1900 64 bit (AMD64)]'

It's not showing in sys.version_info, so it's probably only cosmetic. Also, I don't think this is really a release blocker - just marking it as such so it gets checked (I wonder if it's an artifact of the github migration, I think git uses ^0 to mean something specific in relation to commit IDs?)

I've only checked on Windows. I don't know if it's the same on Unix.

If it's deemed cosmetic, I'm happy for it to be downgraded to non-blocking, or even closed as not an issue. Just wanted to flag it up in case it's a symptom of something deeper.