Prototype pattern (Python recipe)

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原文链接:http://code.activestate.com/recipes/86651-prototype-pattern/

http://dongweiming.github.io/python-pototype.html

from copy import deepcopyclass Prototype:    def __init__(self):        self._objs = {}            def registerObject(self, name, obj):        """        register an object.        """        self._objs[name] = obj            def unregisterObject(self, name):        """unregister an object"""        del self._objs[name]            def clone(self, name, **attr):        """clone a registered object and add/replace attr"""        obj = deepcopy(self._objs[name])        obj.__dict__.update(attr)        return obj

if __name__ == '__main__':    class A:        pass    a=A()    prototype=Prototype()    prototype.registerObject("a",a)    b=prototype.clone("a",a=1,b=2,c=3)    # 这里会返回对象a    print(a)    # 这里的对象其实已经被修改成(1, 2, 3)    print(b.a, b.b, b.c)

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