怎么才能输出1 2呢，看到的大佬帮忙解决一下？

坚持到死

2018-09-19

源自：python进阶 4-7

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3 回答

燚燚生辉
2019-06-01

class Person(object):

__count = 0

def __init__(self, name):

Person.__count += 1

self.name = name

p1 = Person('Bob')

try:

print p1.__count

except AttributeError:

print p1._Person__count

p2 = Person('Alice')

try:

print p2.__count

except AttributeError:

print p2._Person__count

print 'AttributeError'

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坚持到死提问者
2018-09-20

class Person(object):

    __count = 0

    @classmethod
    def how_many(cls):
        return cls.__count
    def __init__(self,name):
        self.name=name
        Person.__count=Person.__count+1
p1 = Person('Bob')
print Person.how_many()
p2 = Person('Alice')
print Person.how_many()

try:
    print Person.__count

except AttributeError:
    print 'attributeerror'