The walrus operator := and assignment expressions, PEP 572, was opposed by majority of Python core developers, and led Guido van Rossum to step down from BDFL role. LINKS: PEP 572: https://www.python.org/dev/peps/pep-0572/ Zen of Python: https://www.python.org/dev/peps/pep-0020/ Vote against PEP 572: https://www.mail-archive.com/python-committers@python.org/msg05324.html OUTLINE: 0:00 - Walrus operator 1:26 - Use cases 3:33 - Criticisms 5:59 - Guido van Rossum