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43.4. CensusTotal.__float__()

This method is used when computing statistics on the number of individuals in a census row. Refer to Section 40, “class NumberCell: Base class for numeric table cells” for a general discussion. In particular, here we implement the rule that if the total is in the undefined state (that is, the .total attribute is negative), the return value is 1.0.
# - - -   C e n s u s T o t a l . _ _ f l o a t _ _

    def __float__(self):
        '''Return the floating value of self.
        if is 0:
            return 0.0
        elif < 0:
            return 1.0
            return float(