Guido van Rossum, the creator of Python, and the Benevolent Dictator for Life (BDFL) has retired as the BDFL with no successor named as of July 12, 2018. See the following email from the Python Committers list for full details.
Basically there was a lot of negativity over PEP 572 – Assignment Expressions that appears to have driven the creator of Python into early retirement. While he will still be around to help and mentor, he will no longer be taking part in the community in quite the same way.
I love Python and its community so it makes me sad that Guido would need to step down in this way. However I wish him well and will continue to use and promote Python and civility in our community.