Python中私有變量和私有方法芳

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? ? Python中要想定義的方法或者變量只能在類內(nèi)部使用不被外部使用，可以在方法和變量前面加兩個下劃線，讓其變?yōu)樗接蟹椒ɑ蛩接凶兞?。類外部可以通過 ”_類名__私有屬性（方法）名“ 訪問私有屬性（方法）。

class Person:    __work = 'teacher'
    def __init__(self,name,age):        self.name = name        self.__age = age
    def run(self):        print(self.__age,self.__work)
    def __eat(self):????????print('1111')

__work是私有類變量，類外是無法訪問的

if __name__ == '__main__':
print(Person.__work)

Traceback (most recent call last):
? File "C:/Users/wangli/PycharmProjects/Test/test/test.py", line 20, in 
? ? print(Person.__work)
AttributeError: type object 'Person' has no attribute '__work'

__work是私有類變量，類外類實例對象是無法訪問的

if __name__ == '__main__':
    test1 = Person('王大力','22')
print(test1.__work)
Traceback (most recent call last):
? File "C:/Users/wangli/PycharmProjects/Test/test/test.py", line 21, in 
? ? print(test1.__work)
AttributeError: 'Person' object has no attribute '__work'

__age是私有實例變量，類外類實例對象是無法訪問的

if __name__ == '__main__':
    test1 = Person('王大力','22')
print(test1.__age)
Traceback (most recent call last):
? File "C:/Users/wangli/PycharmProjects/Test/test/test.py", line 21, in 
? ? print(test1.__age)
AttributeError: 'Person' object has no attribute '__age'

__work是私有類變量，__age是私有實例變量，類內(nèi)是可以訪問的

if __name__ == '__main__':
    test1 = Person('王大力','22')
test1.run()
22 teacher

Process finished with exit code 0

__eat（）是私有方法，類外是無法訪問的

if __name__ == '__main__':
    test1 = Person('王大力','22')
print(test1.__eat())
Traceback (most recent call last):
? File "C:/Users/wangli/PycharmProjects/Test/test/test.py", line 21, in 
? ? print(test1.__eat())
AttributeError: 'Person' object has no attribute '__eat'

__work是私有類變量，__age是私有實例變量，__eat（）是私有方法，類外部可以通過 ”_Person___私有屬性（方法）名“ 訪問私有屬性（方法）

if __name__ == '__main__':
    print(Person._Person__work)
    test1 = Person('王大力','22')
    print(test1._Person__work)
    print(test1._Person__age)
test1._Person__eat()

teacher
teacher
22
1111

Process finished with exit code 0