生成器(generator,yield),next,send

#生成器
def generator():
    for i in range(200):
        yield '哇哈哈%s' %i
g = generator() #调用生成数函数，接受作用
ret = g.__next__() #每执行一次g.__next__就是从生成器取值
print(ret)
ret = g.__next__() #每执行一次g.__next__就是从生成器取值

print(ret)

def generator():
    for i in range(200):
        yield '哇哈哈%s' %i
g = generator() #调用生成数函数，接受作用
ret = g.__next__() #每执行一次g.__next__就是从生成器取值
print(ret)
ret = g.__next__() #每执行一次g.__next__就是从生成器取值
print(ret)
num = 0
for i in g:
    num += 1
    if num > 10:
        break
    print(i)

#next send
def generator():
    print(123)
    content = yield 1
    print('======',content)
    print(456)
    yield 2 
g = generator() #调用生成数函数，接受作用
ret = g.__next__() #每执行一次g.__next__就是从生成器取值
print('***',ret)
ret = g.send('hello')  #send的效果和next一样
print('***',ret)

def generator():
    print(123)
    content = yield 1
    print('======',content)
    print(456)
    arg = yield 2
    ''''''
    yield