Mypy will complain: mytest.py:13: error: Incompatible types in assignment ↪(expression has type "str", variable has type ↪"Optional[int]") Sure enough, you now can assign either None or an integer to ...

So named for its appearance (:=), the walrus operator, added in Python 3.8, introduces assignment expressions, a way to assign a value to a variable and then apply a test to the variable in a ...

He wrote, "I don't ever want to have to fight so hard for a PEP (Python Enhancement Proposals) [PEP 572 Assignment Expressions] and find that so many people despise (sic) my decisions." ...