python 析构函数：__del__()

'''
析构函数：__del__()    释放对象是自动调用
'''

class Person(object):
    def run(self):
        print("run")
    def eat(self, food):
        print("eat " + food)
    def __init__(self, name, age, height, weight):
        self.name = name
        self.age = age
        self.height = height
        self.weight = weight
    def __del__(self):
        print("这里是析构函数")

per = Person("hanmeimei", 20, 170, 55)
#释放对象
del per

#对象释放以后就不能再访问了
#print(per.age)

#在函数里定义的对象，会在函数结束时自动释放，这样可以用来减少内存空间的浪费
def func():
    per2 = Person("aa", 1, 1, 1)

func()

while 1:
    pass