题解 | #修改属性1#

class Employee:
    def __init__(self,name,salary,age=None):
        self.name = name
        self.salary = salary
        self.age = age

    def printclass(self):
        try:
            if self.age is None:
                raise ValueError("Error! No age")

            print(f"{self.name}'salary is {self.salary}, and his age is {self.age}")

        except ValueError as ve:
            print(ve)


name = input()
salary = input()
e = Employee(name,salary)
e.printclass()
e.age = int(input())
e.printclass()