chapter 05-02

하신대로따라 그대로 해봤는데 자꾸 다음과 같은 에러가??
몇번을 필기해보았는데도 불구하고 ㅜㅜ

class Averager():
    def __int__(self):
        
        self._series = []

    def __call__(self, v):
        self._series.append(v)
        print('inner >> {} / {}'.format(self._series, len(self._series)))
        return sum(self._series) / len(self._series)

# 인스턴스 생성
averager_cls = Averager()
print(dir(averager_cls))

# 누적
print(averager_cls(10))

---------------------------------------------------------

Traceback (most recent call last):
  File "C:\p_study\p_chapter05_02.py", line 66, in <module>
    print(averager_cls(10))
  File "C:\p_study\p_chapter05_02.py", line 57, in __call__
    self._series.append(v) 

AttributeError: 'Averager' object has no attribute '_series'