python基础4—面向对象

感觉和java相比一个是大公司，一个是小公司， 大公司规范有文档，小公司简约效率高

面向对象  
# 成员属性名称前 加上 __ 意为private
# get / set ：  get_name()   set_name(name) 
class Student:
    def __init__(self, name, age):
        self.name = name
        self.age = age
        
    def detail(self):
        print(self.name)
        print(self.age)
      
class PrimaryStudent(Student):  # inherent
    def lol(self):
        print('can not win then run faster than others')

class CollegeStudent(Student):
    def __init__(self, name, age, gf):  # overrite构造函数
        self.name = name
        self.age = age
        self.gf = gf

    def gf_detail(self):
        print(self.gf)

obj1 = PrimaryStudent('小学生', 7)
obj1.lol()
obj1.detail()

obj2 = CollegeStudent('王思聪', 29, '张雨欣')
obj2.detail()
obj2.gf_detail()

print(dir(obj1))                            # class info as list
print(hasattr(obj1, 'name'))        # True
setattr(obj1, 'name', 'jack')  
print(getattr(obj1, 'name'))          # jack
print(getattr(obj1, 'name', 404))  # jack
fn = getattr(obj1, 'detail')             #7
fn()

#  实例属性和类属性
class Student(object):
    name = 'Student'
    def __init__(self, name):
        self.name = name   # 类属性
s = Student('Bob')
s.score = 90               # 实例属性

print(s.name) 
s.name = 'Jack'          # 给实例属性绑定name属性, 实例属性优先级比类属性高 
print(s.name)              # Jack
print(Student.name)   # Student
del s.name                 # 删除实例name属性
print(s.name)             # Student