python设计模式(原型模式、单例模式)

学习版本3.5.2

import copy

class CloneMyself(object):
def shallow_copy(self):
return copy.copy(self)

def deep_copy(self):
return copy.deepcopy(self)

class ProductA(CloneMyself):
def __init__(self, name, type, color, time):
self.name = name
self.type = type
self.color = color
self.time = time

def print_info(self):
print(self.name,self.type,self.color,self.time)

if __name__ == "__main__":
product1 = ProductA("A","1","y","10:00")
product1.print_info()
product2 = product1.shallow_copy()
product2.print_info()
product3 = product1.deep_copy()
product3.print_info()

A 1 y 10:00
A 1 y 10:00
A 1 y 10:00

class Singleton(object):
_instance = None
def __new__(cls,*args,**kwargs):
if cls._instance is None:
cls._instance = object.__new__(cls,*args,**kwargs)
return cls._instance

def __init__(self):
if not hasattr(self,"num"):
print("create num")
setattr(self,"num",0)

def add(self):
self.num += 1
print("num:",self.num)

if __name__ == "__main__":
c1 = Singleton()
c1.add()
c2 = Singleton()
c2.add()

create num
num: 1
num: 2