def generator():        print(123)        yield 1        print(456)        yield 2        g = generator()ret = g.__next__()print('***'ret)ret = g.send(None)  #send 效果和 next一样print('***'ret)

归纳：

1.send 获取下一个值得效果和next基本一致2.只是在获取下一个值得时候，给上一个yield的位置传一个参数

使用send的注意事项

1.第一次使用生成器的时候，必须使用next获取一个值2.最后一个yield不能接受外部的值

 

def average()    sum = 0    count = 0    avg = 0    while 1:        num = yield avg        sum += num        count += 1        avg = sum / countavg_g = average()avg_g.__next__()avg1 = avg_g.send(10)print(avg1)

 

def init(func):    def inner(*args, **kwargs):        ret = func(*args, **kwargs)        g.__next__()        return g    return inner@initdef average():    sum = 0    count = 0    avg = 0    while 1:        num = yield avg        sum += num        count += 1        avg = sum / countg = average()avg1 = g.send(10)print(avg1)

 

python3.X----->yield from

def generator():    a = '123'    b = 'abc'    for i in a:        yield i    for i in b:        yield ig = generator()for i in g:    print(i)

def generator():    a = '123'    b = 'abc'    yield from a    yield from bg = generator()for i in g:    print(i)