[转载] 简单工厂模式和工厂方法模式在Python中的实现
参考链接： Python中的工厂方法设计模式
简单工厂模式
class Book(object):
def __init__(self,name, price):
self.name = name
self.price = price
def read(self):
print("Book name is {name}, Book's price is {price}".format(name=self.name,price=self.price))
class JavaBook(Book):
def __init__(self,name,price,lang="java"):
super(JavaBook,self).__init__(name,price)
self.lang = lang
def read(self):
super(JavaBook,self).read()
print("Book is written by {lang}".format(lang=self.lang))
class PythonBook(Book):
def __init__(self,name,price,lang="python"):
super(PythonBook,self).__init__(name,price)
self.lang = lang
def read(self):
super(PythonBook,self).read()
print("Book is written by {lang}".format(lang=self.lang))
class BookSimpleFactory(object):
def __init__(self):
pass
def getBook(self,name, price, lang=""):
if lang == "python":
return PythonBook(name, price)
elif lang == "java":
return JavaBook(name,price)
else:
return Book(name,price)
if __name__ == "__main__":
bookfactory = BookSimpleFactory()
book1 = bookfactory.getBook("11-python", "25", "python")
book1.read()
book2 = bookfactory.getBook("12-python", "99", "python")
book2.read()
book3 = bookfactory.getBook("21-java", "46", "java")
book3.read()
book4 = bookfactory.getBook("31-english", "199")
book4.read()
执行一下
C:\Python27\python.exe E:/python-codes/factory-pattern/FactoryPatternSample.py
Book name is 11-python, Book's price is 25
Book is written by python
Book name is 12-python, Book's price is 99
Book is written by python
Book name is 21-java, Book's price is 46
Book is written by java
Book name is 31-english, Book's price is 199
Process finished with exit code 0
工厂方法模式
import abc
import random
class Book(object):
def __init__(self,name, price):
self.name = name
self.price = price
self.publisher = None
def read(self):
print("Book name is {name}, Book's price is {price}".format(name=self.name,price=self.price))
if self.publisher:
print("Book: {name} is published by {publisher} ".format(name = self.name, publisher = self.publisher))
def setpublisher(self, publisher):
self.publisher = publisher
class JavaBook(Book):
def __init__(self,name,price,lang="java"):
super(JavaBook,self).__init__(name,price)
self.lang = lang
def read(self):
super(JavaBook,self).read()
print("Book:{name} is written by {lang}".format(name = self.name, lang=self.lang))
class PythonBook(Book):
def __init__(self,name,price,lang="python"):
super(PythonBook,self).__init__(name,price)
self.lang = lang
def read(self):
super(PythonBook,self).read()
print("Book is written by {lang}".format(lang=self.lang))
class AbstractBookFactory(object):
def __init__(self):
pass
@abc.abstractmethod
def getBook(self, lang):
pass
class IndustryBookFactory(AbstractBookFactory):
def __init__(self):
super(IndustryBookFactory, self).__init__()
def getBook(self, lang):
if lang == "python":
book = PythonBook("Python-book-%s" % (int(10*(random.random()))), int(100*random.random()))
elif lang == "java":
book = JavaBook("Java-book-%s" % (int(10*(random.random()))), int(100*random.random()))
else:
book = Book("Another-book-%s" % (int(10*(random.random()))), int(100*random.random()))
book.setpublisher("IndustryPubish")
return book
class PeopleBookFactory(AbstractBookFactory):
def __init__(self):
super(PeopleBookFactory, self).__init__()
def getBook(self, lang):
if lang == "python":
book = PythonBook("Python-book-%s" % (int(100*(random.random()))), int(100*random.random()))
elif lang == "java":
book = JavaBook("Java-book-%s" % (int(100*(random.random()))), int(100*random.random()))
else:
book = Book("Another-book-%s" % (int(100*(random.random()))), int(100*random.random()))
book.setpublisher("PeoplePubish")
return book
if __name__ == "__main__":
peoplebookfact = PeopleBookFactory()
book1 = peoplebookfact.getBook("python")
book1.read()
print("-"*20)
book2 = peoplebookfact.getBook("java")
book2.read()
print("-"*20)
book3 = peoplebookfact.getBook("hahah")
book3.read()
print("-"*20)
industrybookfactory = IndustryBookFactory()
book11 = industrybookfactory.getBook("python")
book11.read()
print("-"*20)
book21 = industrybookfactory.getBook("java")
book21.read()
print("-"*20)
book31 = industrybookfactory.getBook("hahah")
book31.read()
print("-"*20)
执行一下:
C:\Python27\python.exe D:/代码/python-DP/FactoryMethodSample.py
Book name is Python-book-99, Book's price is 3
Book: Python-book-99 is published by PeoplePubish
Book is written by python
--------------------
Book name is Java-book-46, Book's price is 81
Book: Java-book-46 is published by PeoplePubish
Book:Java-book-46 is written by java
--------------------
Book name is Another-book-4, Book's price is 43
Book: Another-book-4 is published by PeoplePubish
--------------------
Book name is Python-book-2, Book's price is 5
Book: Python-book-2 is published by IndustryPubish
Book is written by python
--------------------
Book name is Java-book-4, Book's price is 92
Book: Java-book-4 is published by IndustryPubish
Book:Java-book-4 is written by java
--------------------
Book name is Another-book-2, Book's price is 96
Book: Another-book-2 is published by IndustryPubish
--------------------
Process finished with exit code 0
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