| f | from collections import Counter | f | from collections import Counter | 
            |  |  |  |  | 
            |  | class DefCounter(Counter): |  | class DefCounter(Counter): | 
            |  |  |  |  | 
            |  | def __init__(self, string, missing=-1): |  | def __init__(self, string, missing=-1): | 
            |  | super().__init__(string) |  | super().__init__(string) | 
            |  | 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((val for val in self.values() if val > 0)) |