以實現斐波那契數列為例：

def create_num(all_num):a, b = 0, 1current_num = 0while current_num < all_num:yield a  # 如果一個函數中有yield語句，那么這個就不在是函數，而是一個生成器的模板a, b = b, a+bcurrent_num += 1return "ok...."obj2 = create_num(10)while True:try:ret = next(obj2)print(ret)except Exception as ret:print(ret.value)break

運行結果：

0
1
1
2
3
5
8
13
21
34
ok....