| f | from collections import Counter | f | from collections import Counter | 
            |  |  |  |  | 
            |  | class DefCounter(Counter): |  | class DefCounter(Counter): | 
            |  |  |  |  | 
            | n | def __init__(self, iterable=None, **kwds): | n | def __init__(self, iterable=None, **kwargs): | 
            |  | self.missing = kwds.pop('missing', -1) |  | self.missing_value = kwargs.pop('missing', -1) | 
            |  | super().__init__(iterable, **kwds) |  | super().__init__(iterable, **kwargs) | 
            |  |  |  |  | 
            |  | def __missing__(self, key): |  | def __missing__(self, key): | 
            | t | return self.missing | t | return self.missing_value | 
            |  |  |  |  | 
            |  | def __abs__(self): |  | def __abs__(self): | 
            |  | return sum((value for value in self.values() if value > 0)) |  | return sum((value for value in self.values() if value > 0)) |