python设计模式之工厂模式 -清零世界

概述

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<h1 id="-" style="margin: 20px 0px 10px; padding: 0px; font-weight: bold; color: black; font-size: 24px; border-bottom: 2px solid #aaaaaa;">一.理解工厂模式
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在面向对象编程中，术语“工厂”表示一个负责创建替他类型对象的类。通常情况下，作为一个工厂的类有一个对象以及与它关联的多个方法。客户端使用某些参数调用此方法，之后，工厂会据此创建所需类型的对象，然后将它们返回给客户端。

 abc  ABCMeta,abstractmethod
<span class="hljs-class"><span class="hljs-keyword" style="color: #ebbbff;">class <span class="hljs-title" style="color: #7285b7;">Coke<span class="hljs-params" style="color: #ffc58f;">(Metaclass=ABCMeta):

<span class="hljs-decorator">@abstractmethod

<span class="hljs-function" style="color: #bbdaff;"><span class="hljs-keyword" style="color: #ebbbff;">def <span class="hljs-title" style="color: #7285b7;">drink<span class="hljs-params" style="color: #ffc58f;">(self):

<span class="hljs-keyword" style="color: #ebbbff;">pass
<span class="hljs-class"><span class="hljs-keyword" style="color: #ebbbff;">class <span class="hljs-title" style="color: #7285b7;">Coca<span class="hljs-params" style="color: #ffc58f;">(Coke):

<span class="hljs-function" style="color: #bbdaff;"><span class="hljs-keyword" style="color: #ebbbff;">def <span class="hljs-title" style="color: #7285b7;">drink<span class="hljs-params" style="color: #ffc58f;">(self):

print(<span class="hljs-string" style="color: #d1f1a9;">'drink Coca-Cola')
<span class="hljs-class"><span class="hljs-keyword" style="color: #ebbbff;">class <span class="hljs-title" style="color: #7285b7;">Pepsi<span class="hljs-params" style="color: #ffc58f;">(Coke):

<span class="hljs-function" style="color: #bbdaff;"><span class="hljs-keyword" style="color: #ebbbff;">def <span class="hljs-title" style="color: #7285b7;">drink<span class="hljs-params" style="color: #ffc58f;">(self):

print(<span class="hljs-string" style="color: #d1f1a9;">'drink Pepsi-Cola')
<span class="hljs-class"><span class="hljs-keyword" style="color: #ebbbff;">class <span class="hljs-title" style="color: #7285b7;">Fast_food_restaurant<span class="hljs-params" style="color: #ffc58f;">():

<span class="hljs-function" style="color: #bbdaff;"><span class="hljs-keyword" style="color: #ebbbff;">def <span class="hljs-title" style="color: #7285b7;">make_coke<span class="hljs-params" style="color: #ffc58f;">(self,name):

<span class="hljs-keyword" style="color: #ebbbff;">return eval(name)()
KCD=Fast_food_restaurant()

coke=KCD.make_coke(<span class="hljs-string" style="color: #d1f1a9;">'Coca')

coke.drink()<span class="hljs-comment" style="color: #7285b7;">#drink Coca-Cola

class Coke(Metaclass=ABCMeta):
@abstractmethod
def drink(self):
pass

class Coca(Coke):
def drink(self):
print('drink Coca-Cola')

class Pepsi(Coke):
def drink(self):
print('drink Pepsi-Cola')

class Fast_food_restaurant():
def make_coke(self,name):
return eval(name)()

KCD=Fast_food_restaurant() coke=KCD.make_coke('Coca') coke.drink()#drink Coca-Cola

 <span class="hljs-title" style="color: #7285b7;">Coke<span class="hljs-params" style="color: #ffc58f;">(Metaclass=ABCMeta):

<span class="hljs-decorator">@abstractmethod

<span class="hljs-function" style="color: #bbdaff;"><span class="hljs-keyword" style="color: #ebbbff;">def <span class="hljs-title" style="color: #7285b7;">drink<span class="hljs-params" style="color: #ffc58f;">(self):

<span class="hljs-keyword" style="color: #ebbbff;">pass
<span class="hljs-class"><span class="hljs-keyword" style="color: #ebbbff;">class <span class="hljs-title" style="color: #7285b7;">Coca<span class="hljs-params" style="color: #ffc58f;">(Coke):

<span class="hljs-function" style="color: #bbdaff;"><span class="hljs-keyword" style="color: #ebbbff;">def <span class="hljs-title" style="color: #7285b7;">drink<span class="hljs-params" style="color: #ffc58f;">(self):

print(<span class="hljs-string" style="color: #d1f1a9;">'drink Coca-Cola')
<span class="hljs-class"><span class="hljs-keyword" style="color: #ebbbff;">class <span class="hljs-title" style="color: #7285b7;">Pepsi<span class="hljs-params" style="color: #ffc58f;">(Coke):

<span class="hljs-function" style="color: #bbdaff;"><span class="hljs-keyword" style="color: #ebbbff;">def <span class="hljs-title" style="color: #7285b7;">drink<span class="hljs-params" style="color: #ffc58f;">(self):

print(<span class="hljs-string" style="color: #d1f1a9;">'drink Pepsi-Cola')
<span class="hljs-class"><span class="hljs-keyword" style="color: #ebbbff;">class <span class="hljs-title" style="color: #7285b7;">Sfencs<span class="hljs-params" style="color: #ffc58f;">(Coke):

<span class="hljs-function" style="color: #bbdaff;"><span class="hljs-keyword" style="color: #ebbbff;">def <span class="hljs-title" style="color: #7285b7;">drink<span class="hljs-params" style="color: #ffc58f;">(self):

print(<span class="hljs-string" style="color: #d1f1a9;">'drink Sfencs-Cola')
<span class="hljs-class"><span class="hljs-keyword" style="color: #ebbbff;">class <span class="hljs-title" style="color: #7285b7;">Fast_food_restaurant<span class="hljs-params" style="color: #ffc58f;">(Metaclass=ABCMeta):

<span class="hljs-decorator">@abstractmethod

<span class="hljs-function" style="color: #bbdaff;"><span class="hljs-keyword" style="color: #ebbbff;">def <span class="hljs-title" style="color: #7285b7;">make_coke<span class="hljs-params" style="color: #ffc58f;">(self):

<span class="hljs-keyword" style="color: #ebbbff;">pass
<span class="hljs-class"><span class="hljs-keyword" style="color: #ebbbff;">class <span class="hljs-title" style="color: #7285b7;">Coca_produce<span class="hljs-params" style="color: #ffc58f;">(Fast_food_restaurant):

<span class="hljs-function" style="color: #bbdaff;"><span class="hljs-keyword" style="color: #ebbbff;">def <span class="hljs-title" style="color: #7285b7;">make_coke<span class="hljs-params" style="color: #ffc58f;">(self):

<span class="hljs-keyword" style="color: #ebbbff;">return Coca()
<span class="hljs-class"><span class="hljs-keyword" style="color: #ebbbff;">class <span class="hljs-title" style="color: #7285b7;">Pepsi_produce<span class="hljs-params" style="color: #ffc58f;">(Fast_food_restaurant):

<span class="hljs-function" style="color: #bbdaff;"><span class="hljs-keyword" style="color: #ebbbff;">def <span class="hljs-title" style="color: #7285b7;">make_coke<span class="hljs-params" style="color: #ffc58f;">(self):

<span class="hljs-keyword" style="color: #ebbbff;">return Pepsi()
<span class="hljs-class"><span class="hljs-keyword" style="color: #ebbbff;">class <span class="hljs-title" style="color: #7285b7;">Sfencs_produce<span class="hljs-params" style="color: #ffc58f;">(Fast_food_restaurant):

<span class="hljs-function" style="color: #bbdaff;"><span class="hljs-keyword" style="color: #ebbbff;">def <span class="hljs-title" style="color: #7285b7;">make_coke<span class="hljs-params" style="color: #ffc58f;">(self):

<span class="hljs-keyword" style="color: #ebbbff;">return Sfencs()
KCD=Sfencs_produce()

coke=KCD.make_coke()

coke.drink()<span class="hljs-comment" style="color: #7285b7;">#drink Sfencs-Cola

class Sfencs(Coke):
def drink(self):
print('drink Sfencs-Cola')

class Fast_food_restaurant(Metaclass=ABCMeta):
@abstractmethod
def make_coke(self):
pass

class Sfencs_produce(Fast_food_restaurant):
def make_coke(self):
return Sfencs()

KCD=Sfencs_produce() coke=KCD.make_coke() coke.drink()#drink Sfencs-Cola

class Fast_food_restaurant(Metaclass=ABCMeta):
@abstractmethod
def make_coke(self):
pass

KCD=Sfencs_produce() coke=KCD.make_coke() coke.drink()#drink Sfencs-Cola

 <span class="hljs-title" style="color: #7285b7;">Ice_coke<span class="hljs-params" style="color: #ffc58f;">(Metaclass=ABCMeta):

<span class="hljs-decorator">@abstractmethod

<span class="hljs-function" style="color: #bbdaff;"><span class="hljs-keyword" style="color: #ebbbff;">def <span class="hljs-title" style="color: #7285b7;">drink<span class="hljs-params" style="color: #ffc58f;">(self):

<span class="hljs-keyword" style="color: #ebbbff;">pass
<span class="hljs-class"><span class="hljs-keyword" style="color: #ebbbff;">class <span class="hljs-title" style="color: #7285b7;">Ordinary_coke<span class="hljs-params" style="color: #ffc58f;">(Metaclass=ABCMeta):

<span class="hljs-decorator">@abstractmethod

<span class="hljs-function" style="color: #bbdaff;"><span class="hljs-keyword" style="color: #ebbbff;">def <span class="hljs-title" style="color: #7285b7;">drink<span class="hljs-params" style="color: #ffc58f;">(self):

<span class="hljs-keyword" style="color: #ebbbff;">pass
<span class="hljs-class"><span class="hljs-keyword" style="color: #ebbbff;">class <span class="hljs-title" style="color: #7285b7;">Coca_ice<span class="hljs-params" style="color: #ffc58f;">(Ice_coke):

<span class="hljs-function" style="color: #bbdaff;"><span class="hljs-keyword" style="color: #ebbbff;">def <span class="hljs-title" style="color: #7285b7;">drink<span class="hljs-params" style="color: #ffc58f;">(self):

print(<span class="hljs-string" style="color: #d1f1a9;">'drink  Coca-ice-Cola')
<span class="hljs-class"><span class="hljs-keyword" style="color: #ebbbff;">class <span class="hljs-title" style="color: #7285b7;">Pepsi_ice<span class="hljs-params" style="color: #ffc58f;">(Ice_coke):

<span class="hljs-function" style="color: #bbdaff;"><span class="hljs-keyword" style="color: #ebbbff;">def <span class="hljs-title" style="color: #7285b7;">drink<span class="hljs-params" style="color: #ffc58f;">(self):

print(<span class="hljs-string" style="color: #d1f1a9;">'drink Pepsi-ice-Cola')
<span class="hljs-class"><span class="hljs-keyword" style="color: #ebbbff;">class <span class="hljs-title" style="color: #7285b7;">Coca_ordinary<span class="hljs-params" style="color: #ffc58f;">(Ordinary_coke):

<span class="hljs-function" style="color: #bbdaff;"><span class="hljs-keyword" style="color: #ebbbff;">def <span class="hljs-title" style="color: #7285b7;">drink<span class="hljs-params" style="color: #ffc58f;">(self):

print(<span class="hljs-string" style="color: #d1f1a9;">'drink Coca-ordinary-Cola')
<span class="hljs-class"><span class="hljs-keyword" style="color: #ebbbff;">class <span class="hljs-title" style="color: #7285b7;">Pepsi_ordinary<span class="hljs-params" style="color: #ffc58f;">(Ordinary_coke):

<span class="hljs-function" style="color: #bbdaff;"><span class="hljs-keyword" style="color: #ebbbff;">def <span class="hljs-title" style="color: #7285b7;">drink<span class="hljs-params" style="color: #ffc58f;">(self):

print(<span class="hljs-string" style="color: #d1f1a9;">'drink Pepsi-ordinary-Cola')
<span class="hljs-class"><span class="hljs-keyword" style="color: #ebbbff;">class <span class="hljs-title" style="color: #7285b7;">Fast_food_restaurant<span class="hljs-params" style="color: #ffc58f;">(Metaclass=ABCMeta):

<span class="hljs-decorator">@abstractmethod

<span class="hljs-function" style="color: #bbdaff;"><span class="hljs-keyword" style="color: #ebbbff;">def <span class="hljs-title" style="color: #7285b7;">make_ice_coke<span class="hljs-params" style="color: #ffc58f;">(self):

<span class="hljs-keyword" style="color: #ebbbff;">pass
<span class="hljs-decorator"&gt;@abstractmethod</span>
<span class="hljs-function" style="color: #bbdaff;"&gt;<span class="hljs-keyword" style="color: #ebbbff;"&gt;def</span> <span class="hljs-title" style="color: #7285b7;"&gt;make_ordinary_coke</span><span class="hljs-params" style="color: #ffc58f;"&gt;(self)</span>:</span>
    <span class="hljs-keyword" style="color: #ebbbff;"&gt;pass</span>
<span class="hljs-class"><span class="hljs-keyword" style="color: #ebbbff;">class <span class="hljs-title" style="color: #7285b7;">Coca_produce<span class="hljs-params" style="color: #ffc58f;">(Fast_food_restaurant):

<span class="hljs-function" style="color: #bbdaff;"><span class="hljs-keyword" style="color: #ebbbff;">def <span class="hljs-title" style="color: #7285b7;">make_ice_coke<span class="hljs-params" style="color: #ffc58f;">(self):

<span class="hljs-keyword" style="color: #ebbbff;">return Coca_ice()

<span class="hljs-function" style="color: #bbdaff;"><span class="hljs-keyword" style="color: #ebbbff;">def <span class="hljs-title" style="color: #7285b7;">make_ordinary_coke<span class="hljs-params" style="color: #ffc58f;">(self):

<span class="hljs-keyword" style="color: #ebbbff;">return Coca_ordinary()
<span class="hljs-class"><span class="hljs-keyword" style="color: #ebbbff;">class <span class="hljs-title" style="color: #7285b7;">Pepsi_produce<span class="hljs-params" style="color: #ffc58f;">(Fast_food_restaurant):

<span class="hljs-function" style="color: #bbdaff;"><span class="hljs-keyword" style="color: #ebbbff;">def <span class="hljs-title" style="color: #7285b7;">make_ice_coke<span class="hljs-params" style="color: #ffc58f;">(self):

<span class="hljs-keyword" style="color: #ebbbff;">return Pepsi_ice()

<span class="hljs-function" style="color: #bbdaff;"><span class="hljs-keyword" style="color: #ebbbff;">def <span class="hljs-title" style="color: #7285b7;">make_ordinary_coke<span class="hljs-params" style="color: #ffc58f;">(self):

<span class="hljs-keyword" style="color: #ebbbff;">return Pepsi_ordinary()
KCD=Coca_produce()

coke=KCD.make_ice_coke()

coke.drink()<span class="hljs-comment" style="color: #7285b7;">#drink  Coca-ice-Cola

<span class="hljs-decorator"&gt;@abstractmethod</span>
<span class="hljs-function" style="color: #bbdaff;"&gt;<span class="hljs-keyword" style="color: #ebbbff;"&gt;def</span> <span class="hljs-title" style="color: #7285b7;"&gt;make_ordinary_coke</span><span class="hljs-params" style="color: #ffc58f;"&gt;(self)</span>:</span>
    <span class="hljs-keyword" style="color: #ebbbff;"&gt;pass</span>

class Ordinary_coke(Metaclass=ABCMeta):
@abstractmethod
def drink(self):
pass

class Coca_ice(Ice_coke):
def drink(self):
print('drink Coca-ice-Cola')

class Pepsi_ice(Ice_coke):
def drink(self):
print('drink Pepsi-ice-Cola')

class Coca_ordinary(Ordinary_coke):
def drink(self):
print('drink Coca-ordinary-Cola')

class Pepsi_ordinary(Ordinary_coke):
def drink(self):
print('drink Pepsi-ordinary-Cola')

class Fast_food_restaurant(Metaclass=ABCMeta):
@abstractmethod
def make_ice_coke(self):
pass

class Coca_produce(Fast_food_restaurant):
def make_ice_coke(self):
return Coca_ice()
def make_ordinary_coke(self):
return Coca_ordinary()

class Pepsi_produce(Fast_food_restaurant):
def make_ice_coke(self):
return Pepsi_ice()
def make_ordinary_coke(self):
return Pepsi_ordinary()

KCD=Coca_produce() coke=KCD.make_ice_coke() coke.drink()#drink Coca-ice-Cola

class Fast_food_restaurant(Metaclass=ABCMeta):
@abstractmethod
def make_ice_coke(self):
pass

<span class="hljs-decorator"&gt;@abstractmethod</span>
<span class="hljs-function" style="color: #bbdaff;"&gt;<span class="hljs-keyword" style="color: #ebbbff;"&gt;def</span> <span class="hljs-title" style="color: #7285b7;"&gt;make_ordinary_coke</span><span class="hljs-params" style="color: #ffc58f;"&gt;(self)</span>:</span>
    <span class="hljs-keyword" style="color: #ebbbff;"&gt;pass</span>

KCD=Coca_produce() coke=KCD.make_ice_coke() coke.drink()#drink Coca-ice-Cola

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python设计模式之工厂模式

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