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之前代码都是直接在函数级别使用yield，但封装class后如何使用yield很少遇到。
经过半天的学习，总算完成示例。代码没有什么特殊地方，仅仅作为一个工作项。
与生成器合作：
########################################################################
class Detail(object):
""""""
#----------------------------------------------------------------------
def __init__(self,qty):
"""Constructor"""
self.qty = qty
########################################################################
class Bill(object):
""""""
#----------------------------------------------------------------------
def __init__(self,no):
"""Constructor"""
self.no = no
self.detail_lst = list()
def AddDetail(self,qty):
self.detail_lst.append(Detail(qty))
########################################################################
class Account(object):
""""""
#----------------------------------------------------------------------
def __init__(self,total):
"""Constructor"""
self.total = total
def doBuy(self,BllLst):
for objBll in BllLst:
self.total += 1
yield objBll
########################################################################
class Pay(object):
""""""
#----------------------------------------------------------------------
def __init__(self):
"""Constructor"""
pass
def doPay(self,bll):
for objBll in bll:
for (index,detail) in enumerate(objBll.detail_lst):
yield detail.qty
acc = Account(0)
pay = Pay()
bllLst = list()
bll = Bill(1)
bll.AddDetail(5)
bll.AddDetail(10)
bllLst.append(bll)
bll = Bill(2)
bll.AddDetail(15)
bll.AddDetail(20)
bllLst.append(bll)
rmtPay = pay.doPay(acc.doBuy(bllLst))
paySum = 0
for qty in rmtPay:
paySum += qty
print(‘count: %d,sum : %d‘ % (acc.total, paySum))
与协程的合作：
def coroutine(func):
def start(*args,**kwargs):
g = func(*args,**kwargs)
g.__next__()
return g
return start
########################################################################
class Detail(object):
""""""
#----------------------------------------------------------------------
def __init__(self,qty):
"""Constructor"""
self.qty = qty
########################################################################
class Account(object):
""""""
#----------------------------------------------------------------------
def __init__(self,total):
"""Constructor"""
self.total = total
@coroutine
def Buy(self):
while(True):
objDetail = (yield)
if(objDetail is None):
break
self.total += objDetail.qty
########################################################################
class Pay(object):
""""""
#----------------------------------------------------------------------
def __init__(self,nextStop):
"""Constructor"""
self.billCount = 0
self.nextStop = nextStop
@coroutine
def doPay(self):
while(True):
objDetail = (yield)
if(objDetail is None):
break
self.billCount += 1
self.nextStop.send(objDetail)
acc = Account(10)
pay = Pay(acc.Buy())
obj = pay.doPay()
bill_1 = Detail(10)
obj.send(bill_1)
bill_2 = Detail(20)
obj.send(bill_2)
print(‘count : %d , sum : %d‘ % (pay.billCount,acc.total))
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原文地址：http://www.cnblogs.com/febwave/p/5051331.html
