class Person(object):
    def __init__(self, name, gender):
        self.name = name;
        self.gender = gender;

class Student(Person):
        def __init__(self, name, gender ,score):
            super(Student, self).__init__(name, gender);
            self.score = score;

        def whoAmI(self):
            return 'I am a Student, my name is %s' % self.name;

s = Student('lqc', 'female', 99);
print s.whoAmI();            

print type(123);    # <type 'int'>
print type(s);    #<class '__main__.Student'>            

dir(123) # 获取整型变量int的所有属性