python 生成器

python 生成器一共两种创建方法：

1，(x for x in range(5))

2,yield

# vim 3.py

def fib(max):
n,before,after = 0,0,1
while n < max:
yield before
before,after = after,before+after
n += 1

g = fib(8)
print (next(g))
print (next(g))
print (next(g))
print (next(g))
print (next(g))
print (next(g))
print (next(g))
print (next(g))

[root@localhost python]# python 3.py
0
1
1
2
3
5
8
13

# vim 4.py
def bar():
  print ("ok1")     #1

  count = yield 1
  print (count)

  yield 2


b = bar()
next(b)

ret = b.send("eeeeeeeeeeeeeeeee")
print (ret)

运行结果：

[root@localhost python]# python 4.py
ok1
eeeeeeeeeeeeeeeee
2
看现象。。。。。