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))