斐波那契

def fib(max): #10
    n, a, b = 0, 0, 1
    while n < max: #n<10
        #print(b)
        yield b
        a, b = b, a + b
        n = n + 1
    return '---done---'

g = fib(6)
while True:
    try:
        x = next(g)
        print('g:', x)
    except StopIteration as e:
        print('Generator return value:', e.value)
        break

print("====start loop======")

g: 1
g: 1
g: 2
g: 3
g: 5
g: 8
Generator return value: ---done---
====start loop======