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class Student:
# 类属性
__count = 0
def __init__(self, name) -> None:
# 实例属性
self.name = name
Student.__count += 1
self.__age = 100
self._score = 1000
s1 = Student('haha')
print(s1._score) # 1000
# print(s1.__age) # AttributeError: 'Student' object has no attribute '__age'
print(dir(s1)) # ['_Student__age', '_Student__count', '__class__', ... 'name']
print('age : {}, count: {}'.format(s1._Student__age, s1._Student__count)) # age : 100, count: 1
for i in range(5):
s = Student(i)
print('name : {}, count : {}'.format(s.name, s._Student__count))
# 打印结果
name : 0, count : 2
name : 1, count : 3
name : 2, count : 4
name : 3, count : 5
name : 4, count : 6
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