Question 2: Next Fibonacci Object

Implement the next method of the Fib class. For this class, the value attribute is a Fibonacci number. The next method returns a Fib instance whose value is the next Fibonacci number. The next method should take only constant time.

Hint: Assign value and previous attributes within next.

class Fib():
    """A Fibonacci number.

    >>> start = Fib()
    >>> start
    0
    >>> start.next()
    1
    >>> start.next().next()
    1
    >>> start.next().next().next()
    2
    >>> start.next().next().next().next()
    3
    >>> start.next().next().next().next().next()
    5
    >>> start.next().next().next().next().next().next()
    8
    """

    def __init__(self):
        self.value = 0

    def next(self):
        "*** YOUR CODE HERE ***"

    def __repr__(self):
        return str(self.value)

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