def _validate_slice(self, start, end):
        """Validate start and end and return them as positive bit positions."""
        if start is None:
            start = 0
        elif start < 0:
            start += self.len
        if end is None:
            end = self.len
        elif end < 0:
            end += self.len
        if not 0 <= end <= self.len:
            raise ValueError("end is not a valid position in the bitstring.")
        if not 0 <= start <= self.len:
            raise ValueError("start is not a valid position in the bitstring.")
        if end < start:
            raise ValueError("end must not be less than start.")
        return start, end
def _validate_slice ( self , start , end ) : if start is None : start = 0 elif start < 0 : start += self . len if end is None : end = self . len elif end < 0 : end += self . len if not 0 <= end <= self . len : raise ValueError ( "end is not a valid position in the bitstring." ) if not 0 <= start <= self . len : raise ValueError ( "start is not a valid position in the bitstring." ) if end < start : raise ValueError ( "end must not be less than start." ) return start , end
Validate start and end and return them as positive bit positions.