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