python中类的继承

python中类的继承

在python中面向对象编程中实现继承，以下面一个实例进行说明。

class SchoolMenber():
    # __init__类似于c++中的构造函数
    # __init__必须赋予一个self的参数，也可以有其他参数用于初始化
    def __init__(self, name, age):
        self.name = name
        self.age = age
        print("Initialized SchoolMember:%s" % self.name)

    def tell(self):
        print("Name: %s, Age: %s" % (self.name, self.age))

    # __del__类似于c++中的析构函数
    def __del__(self):
        print("%s has been removed from database" % self.name)


class Teacher(SchoolMenber):
    # 把基本类的名称作为一个元组放在新类定义时的括号中,实现了继承
    def __init__(self, name, age, salary):
        # 注意!这里调用了基本类的__init__,初始化了基本类中的部分
        # 重要!python不会自动调用基本类的构造函数,要coder亲自调用它
        SchoolMenber.__init__(self, name, age)
        self.salary = salary
        print("Initialized Teacher: %s" % self.name)

    def tell(self):
        print("Teacher: %s, Salary: %s" % (self.name, self.salary))


class Student(SchoolMenber):
    def __init__(self, name, age, grade):
        SchoolMenber.__init__(self, name, age)
        self.grade = grade
        print("Initialized Student: %s" % self.name)

    def tell(self):
        print("Student: %s, Grade: %s" %(self.name, self.grade))