class Adapter(object):
"""
适配器模式
对于不同接口(新旧,性质,等差异)进行兼容化
主要体现在方法的兼容
1.普通的方式 可以是在适配器里定义以个适配方法,
根据不同情况进行调用,也就是将方法(接口进行统一)
2.结合Python语言特点 Python类中有__dict__ 包含了此类的属性(方法)
可以对通过对__dict__更新,进行接口的统一,进而达到适配效果
"""
def __init__(self, obj, adapted_method):
self.ada = obj
# self.__dict__.update(adapted_method)
# 此方法可以代替run 方法
def run(self):
if isinstance(self.ada, C):
return self.ada.run()
if isinstance(self.ada, A):
return self.ada.print_img()
if isinstance(self.ada, B):
return self.ada.play_song()
return ""
def __str__(self):
return str(self.ada)
class A(object):
def __init__(self, name):
self.name = name
def print_img(self):
return "render an image"
def __str__(self):
return "the {}, ".format(self.name)
class B(object):
def __init__(self, name):
self.name = name
def play_song(self):
return "palying songs"
def __str__(self):
return "the {}, ".format(self.name)
class C(object):
def __init__(self, name):
self.name = name
def run(self):
return "starting play !"
def __str__(self):
return "the {}, ".format(self.name)
if __name__ == "__main__":
objs = []
a = A("Nvidia")
b = B("Realtek")
c = C("Acer")
objs.append(Adapter(c, dict(run=c.run)))
objs.append(Adapter(a, dict(run=a.print_img)))
objs.append(Adapter(b, dict(run=b.play_song)))
for item in objs:
print "{} {}".format(str(item), item.run())
运行结果:
the Acer, starting play !
the Nvidia, render an image
the Realtek, palying songs