生成器及推导式

def ger():
    print('hello')
    yield 'Hi'
ret=ger()
print(ret)
#<generator object ger at 0x00000137A9D985E8>#结果

def ger():
    print('hello')
    return 'Hi'
ret=ger()
print(ret)
#hello#结果
#Hi

def ger():
    print('hello')
    yield 'Hi'
ret=ger()
print(ret.__next__())
#hello结果
#Hi
'''

def ger():
    print('hello')
    yield 'Hi'
    yield  '春暖花开'
ret=ger()
print(ret.__next__())
print(ret.__next__())

#hello
#Hi
#春暖花开

'''
'''

def ger():
    print('hello')
    yield 'Hi'
    yield  '春暖花开'
    yield  '面朝大海'
ret=ger()
for fr in ret:
    print(fr)

#hello结果
#Hi
#春暖花开
#面朝大海
'''

def add(a,b):
    return a+b
def rang():
    for i in range(4):
        yield i
g=rang()
for n in [1,10,5]:#遇到这样的可拆分为如下'''  '''中的代码
    g=(add(n,i) for i in g)
'''
#上面for里的代码等价如下：
n=1
g=(add(n,i) for i in g)#(add(n,i) for i in rang())
n=10
g=(add(n,i) for i in g)#(add(n,i) for i in (add(n,i) for i in rang()))
n=5
g=(add(n,i) for i in g)#g=(add(n,i) for i in (add(n,i) for i in (add(n,i) for i in rang())))#实际执行
'''
print(list(g))#