它们的形式为`运算符=`，等价于先执行运算再赋值。print(f后赋值：a= 3 → a = {a}# 输出：加后赋值：a= 3 → a = 8。print(f后赋值：b -= 2 → b = {b}# 输出：减后赋值：b -= 2 → b = 8。print(f运算赋值：f = 3 → f = {f}# 输出：幂运算赋值：f = 3 → f = 8。print(f赋值：x = {x}, y =