生成器 send() 方法

generator-send.py

def gen(stop):
    i = 0
    while True:
        if i >= stop:
            raise StopIteration
        i = (yield i) or i+1

g = gen(100)
print(next(g))    # Python 3 compatibility
print(next(g))
g.send(5)
print(next(g))
g.close()