CPython 3.8.0b1 Is Available for Testing New features include: f-string debugging, “async REPL” mode, AsyncMock in unittest.mock, async-support for unittest, math.comb added, Python embedding got better, and more. PYTHON.ORG
CPython 3.8.1rc1 Available for Testing PYTHON.ORG
CPython 3.8.0 Released Assignment expressions, positional-only arguments, = specifier in f-strings, and more. Click the link...
CPython Release 3.8.0b4 This is the last beta before 3.8 RC1. PYTHON.ORG