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Part 1

Part 2

def trap_overflow_threshold(big):
    """Determine the threshold when overflow traps.

    The difference from the non-trap case is that the middle value, big,
    returned from the saerch is the greatest power of the radix, so the
    task is to fill it out to max value without increasing the exponent.

    Argunment:
        big: biggest finite power of the radix

    Returns:
        oflo: overflow threshold
    """

    oflo = big * (ONE_OVER_H * ULP_OF_ONE_PLUS - ONE_OVER_H)
    oflo = oflo + ((ONE - ONE_OVER_H) * ULP_OF_ONE_PLUS) * big
    return oflo

Part 3