python设计模式创建型

# coding:utf8
class :
    def __init__(self):
        self.name = None
        self.gender = None

    def getName(self):
        return self.name

    def getGender(self):
        return self.gender


class Male(Person):
    def __init__(self, name):
        self.name = name

class Female(Person):
    def __init__(self, name):
        self.name = name


class Factory:
    def getPerson(self, name, gender):
        if gender == 'M':
            return Male(name)
        if gender == 'F':
            return Female(name)


if __name__ == '__main__':
    factory = Factory()
    person = factory.getPerson("Chetan", "M")
    print(person.getName())

#!/usr/bin/env python
# -*- coding: utf-8 -*-

# http://ginstrom.com/scribbles/2007/10/08/design-patterns-python-style/

"""Implementation of the abstract factory pattern"""

import random


class PetShop:
    """A pet shop"""

    def __init__(self, animal_factory=None):
        """pet_factory is our abstract factory.  We can set it at will."""
        self.pet_factory = animal_factory

    def show_pet(self):
        """Creates and shows a pet using the abstract factory"""
        pet = self.pet_factory.get_pet()
        print("We have a lovely {}".format(pet))
        print("It says {}".format(pet.speak()))
        print("We also have {}".format(self.pet_factory.get_food()))


# Stuff that our factory makes

class Dog:
    def speak(self):
        return "woof"

    def __str__(self):
        return "Dog"


class Cat:
    def speak(self):
        return "meow"

    def __str__(self):
        return "Cat"


# Factory classes

class DogFactory:

    def get_pet(self):
        return Dog()

    def get_food(self):
        return "dog food"


class CatFactory:

    def get_pet(self):
        return Cat()

    def get_food(self):
        return "cat food"


# Create the proper family
def get_factory():
    """Let's be dynamic!"""
    return random.choice([DogFactory, CatFactory])()


# Show pets with various factories

for i in range(3):
    shop = PetShop(get_factory())
    shop.show_pet()
    print("=" * 20)

# coding:utf8

"""
    Builder
"""


# Director
class Director(object):
    def __init__(self):
        self.builder = None

    def construct_building(self):
        self.builder.new_building()
        self.builder.build_floor()
        self.builder.build_size()

    def get_building(self):
        return self.builder.building


# Abstract Builder
class Builder(object):
    def __init__(self):
        self.building = None

    def new_building(self):
        self.building = Building()


# Concrete Builder
class BuilderHouse(Builder):
    def build_floor(self):
        self.building.floor = 'One'

    def build_size(self):
        self.building.size = 'Big'


class BuilderFlat(Builder):
    def build_floor(self):
        self.building.floor = 'More than One'

    def build_size(self):
        self.building.size = 'Small'


# Product
class Building(object):
    def __init__(self):
        self.floor = None
        self.size = None

    def __repr__(self):
        return 'Floor: %s | Size: %s' % (self.floor, self.size)


# Client
if __name__ == "__main__":
    director = Director()
    director.builder = BuilderHouse()
    director.construct_building()
    building = director.get_building()
    print(building)
    director.builder = BuilderFlat()
    director.construct_building()
    building = director.get_building()
    print(building)

# coding:utf8
'''
Prototype
'''

import copy


class Prototype:
    def __init__(self):
        self._objects = {}

    def register_object(self, name, obj):
        """Register an object"""
        self._objects[name] = obj

    def unregister_object(self, name):
        """Unregister an object"""
        del self._objects[name]

    def clone(self, name, **attr):
        """Clone a registered object and update inner attributes dictionary"""
        obj = copy.deepcopy(self._objects.get(name))
        obj.__dict__.update(attr)
        return obj


def main():
    class A:
        def __str__(self):
            return "I am A"

    a = A()
    prototype = Prototype()
    prototype.register_object('a', a)
    b = prototype.clone('a', a=1, b=2, c=3)

    print(a)
    print(b.a, b.b, b.c)


if __name__ == '__main__':
    main()

import threading


class Singleton(object):
    _instance_lock = threading.Lock()

    def __init__(self):
        pass

    def __new__(cls, *args, **kwargs):
        if not hasattr(Singleton, "_instance"):
            with Singleton._instance_lock:
                if not hasattr(Singleton, "_instance"):
                    Singleton._instance = object.__new__(cls)
        return Singleton._instance


obj1 = Singleton()
obj2 = Singleton()
print(obj1, obj2)


def task(arg):
    obj = Singleton()
    print(obj)


for i in range(10):
    t = threading.Thread(target=task, args=[i, ])
    t.start()