一：私有类属性，私有实例属性

class PersonDemo():
    # 私有类属性
    __age = 10

    def __init__(self):
        # 私有实例属性
        self.__weight = 100

from python知识点 import Person

p = Person.PersonDemo()
print(p.__age)
print(p.__weight)

# 结果
Traceback (most recent call last):
  File "F:/pycharm测试功能文件夹/python知识点/Use_Person.py", line 4, in <module>
    print(p.__age)
AttributeError: ‘PersonDemo‘ object has no attribute ‘__age‘

class PersonDemo():
    # 私有类属性
    __age = 10

    def __init__(self):
        # 私有实例属性
        self.__weight = 100

    def get__age(self):
        return self.__age


    def get__weight(self):
        return self.__weight

from python知识点 import Person

p = Person.PersonDemo()
age_result = p.get__age()
weight_result = p.get__weight()
print(age_result,weight_result)

# 结果
10 100