1.Python的生成器是一种特殊的迭代器
1 def create_generator(all_num): 2 a, b = 0, 1 3 ind = 0 4 while ind < all_num: 5 yield a # 程序执行到此处等待取值函数不会出栈, yield返回一个生成器模板类似Python class 6 a, b = b, a+b 7 ind += 1 8 9 10 gen_obj = create_generator(10) 11 for num in gen_obj: 12 print(num) 13 14 gen_obj1 = create_generator(20) 15 16 print('-'*50) 17 18 while True: 19 try: 20 print(next(gen_obj1)) 21 except StopIteration: 22 print('迭代完成') 23 break 24 25 print('*'*50) 26 print(gen_obj) 27 print(dir(gen_obj))
程序输出:
1 0 2 1 3 1 4 2 5 3 6 5 7 8 8 13 9 21 10 34 11 -------------------------------------------------- 12 0 13 1 14 1 15 2 16 3 17 5 18 8 19 13 20 21 21 34 22 55 23 89 24 144 25 233 26 377 27 610 28 987 29 1597 30 2584 31 4181 32 迭代完成 33 ************************************************** 34 <generator object create_generator at 0x7f134931c360> 35 ['__class__', '__del__', '__delattr__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__iter__', '__le__', '__lt__', '__name__', '__ne__', '__new__', '__next__', '__qualname__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', 'close', 'gi_code', 'gi_frame', 'gi_running', 'gi_yieldfrom', 'send', 'throw'] 36 37 Process finished with exit code 0
2.生成器中的send的方法,send也可以和next一样启动生成器并且可以传入一个值给生成器
1) 生成器可以选择通过这个传入值可以改变生成器的行为.