海象运算符（新运算符）

"There is new syntax := that assigns values to variables as part of a larger expression. It is affectionately known as “the walrus operator” due to its resemblance to the eyes and tusks of a walrus."

“PEP572的标题是「Assignment Expressions」，也就是「赋值表达式」，也叫做「命名表达式」，不过它现在被广泛的别名是「海象运算符」(The Walrus Operator)。因为:=很像海象「眼睛小，长着两枚长长的牙」这个特点^_^”