a=(x*2 for x in range(1000))

# print(a.next())#python2使用

print(a.__next__()) #python3使用

print(next(a)) #python2和python3均可使用

def func():

    print('one')

    result = yield 'two'

    print(result)

    print('four')

    rr = yield 'five'

    print(rr, 'six')

a = func()

print(a.send(None))

# a.__next__()

print(a.send('three'))