Python_生成器

Posted 2020-10-28 soapolddaddy

1.生成器

只有在调用时才生成相应的数据，只记录当前位置，只有一个__next__()方法.

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

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