| f | from collections import Counter | f | from collections import Counter | 
            |  |  |  |  | 
            |  | class DefCounter(Counter): |  | class DefCounter(Counter): | 
            |  |  |  |  | 
            | n | def __init__(self, *maps, missing=-1): | n | def __init__(self, *args, missing=-1): | 
            |  | super().__init__(*maps) |  | super().__init__(*args) | 
            |  | self.missing = missing |  | self.missing = missing | 
            |  |  |  |  | 
            |  | def __missing__(self, key): |  | def __missing__(self, key): | 
            |  | return self.missing |  | return self.missing | 
            |  |  |  |  | 
            |  | def __abs__(self): |  | def __abs__(self): | 
            | t | return sum((value for value in self.values() if value > 0)) | t | return sum([x for x in self.values() if x > 0]) |