Python-Iterators-FibonacciTill20-IV

Python-Iterators-FibonacciTill20-IV.py

def FibonacciTill20():
    n1, n2 = 0, 1
    max_num = 20
    while True:
        n1, n2 = n2, (n1 + n2)
        if n2 <= max_num:
            yield n2
        else:
            raise StopIteration


fibonacci_nums = FibonacciTill20()

print(fibonacci_nums.__iter__())    # <generator object FibonacciTill20 at 0x10b3da190>
print(fibonacci_nums.__next__())    # 1
print(fibonacci_nums.__next__())    # 2
print(fibonacci_nums.__next__())    # 3
print(fibonacci_nums.__next__())    # 5
print(fibonacci_nums.__next__())    # 8
print(fibonacci_nums.__next__())    # 13
print(fibonacci_nums.__next__())    # Exception: StopIteration