_ClassName__privt
class ClassName:
__privt = 50 # 私有變量
a = ClassName()
# 私有變量外界無法訪問
print(a.__privt) # AttributeError: 'ClassName' object has no attribute '__privt'
print(a._ClassName__privt) # 50 強制訪問私有變量（加前綴 _ClassName ）
print(CounterList.__mro__)
(<class '__main__.CounterList'>, <class 'list'>, <class 'object'>)
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