生成器

def fib(num):
    a, b = 0, 1
    index = 0
    while index < num:
        yield a
        a, b = b, a+b
        index += 1
    return ‘ok...‘

f = fib(100)

while True:
    try:
        print(next(f))
    except Exception as e:
        print(e.value)
        break
        
# for num in f:
#     print(num)

def fib(num):
    a, b = 0, 1
    index = 0
    while index < num:
        temp = yield a
        print(‘temp:‘,temp)
        a, b = b, a+b
        index += 1
f = fib(20)
ret = next(f)
print(ret)
ret2 = f.send(‘test‘)
print(ret2)