class Fib:
    '''Iterator for the Fibonacci seq.'''
    def __init__(self, max):
        self.max = max
    def __iter__(self):
        self.a = 0
        self.b = 1
        return self
    def __next__(self):
        fib = self.a
        if fib > self.max:
            raise StopIteration
        self.a,self.b=self.b,self.a+self.b
        return fib
myFibA = Fib(3)
myFibB = Fib(100)
print(myFibA)
print(myFibA.__class__)
print(myFibA.__doc__)
print(myFibA.max)
print(myFibB.max)
# iter(myFibA) # calls __iter__
# next(myFibA) # calls __next__
print("Fibonacci sequence up to 3 inclusive")
for n in myFibA:
    print(n, end=" ")
print()
print("Fibonacci sequence up to 100 inclusive")
for n in myFibB:
    print(n, end=" ")
print()
print("Power of list magic:")
print(list(myFibA))
print("Fin")