实用:python类的私有变量使用

class Person:
    def __init__(self,name,age=18):
        self.name = name
        self.age = age

    def growup(self,inc=1):
        if 0 < self.age < 150:
            self.age += inc


tom = Person('tom')
tom.age = 180 #破坏函数中if判断的本意
print(tom.age)

#改造(私有变量)
print('='*50)
class Person2:
    def __init__(self,name,age=18):
        self.name = name
        self.__age = age

    def growup(self,inc=1):
        if 0 < self.__age < 150:
            self.__age += inc

    def getage(self):
        return self.__age

tom2 = Person2('tom2')
print(tom2.getage())
print('='*50)
print(tom2.age)

运行结果:

180
==================================================
18
==================================================
Traceback (most recent call last):
  File "/home/yzx/PycharmProjects/python/t5.py", line 32, in 
    print(tom2.age)
AttributeError: 'Person2' object has no attribute 'age'

Process finished with exit code 1