生成器函数

#生成器函数
# def generator():
#     print(1)
#     return ‘a‘
#
# ret = generator()
# print(ret)

#只要含有yield关键字的函数都是生成器函数
# yield不能和return共用且需要写在函数内
def generator():
    print(1)
    yield ‘a‘
# #生成器函数 ： 执行之后会得到一个生成器作为返回值
ret = generator()
print(ret)
print(ret.__next__())

def generator():
    print(1)
    yield ‘a‘
    print(2)
    yield ‘b‘
    yield ‘c‘
g = generator()
for i in g:
    print(i)
ret = g.__next__()
print(ret)
ret = g.__next__()
print(ret)
ret = g.__next__()
print(ret)

#娃哈哈%i
def wahaha():
    for i in range(2000000):
        yield ‘娃哈哈%s‘%i
g = wahaha()
g1 = wahaha()
print(g.__next__())
print(g1.__next__())

g = wahaha()
count = 0
for i in g:
    count +=1
    print(i)
    if count > 50:
        break
# print(‘*******‘,g.__next__())
for i in g:
    count +=1
    print(i)
    if count > 100:
        break