python的getattr和setattr

getattr可以取出来某个属性，这个属性如果是一个字段，就得到字段的值了，如果是一个方法，就得到这个方法的指针了，然后可以根据方法的指针来调用方法。下面是代码的例子：

# -*- coding: utf-8 -*-class AttrTest(object):    def __init__(self):        self.__info = "AttrTest:"        self.field = "invalidField"    @property    def Info(self):        return self.__info    @Info.setter    def Info(self, new_value):        self.__info = new_value    @Info.deleter    def Info(self):        del self.__info    @staticmethod    def JoinSM(a, b):        return str(a) + str(b)    def JoinX(a, b):        """这个函数实际上属于staticmethod,这种定义不太好"""        return "Join2:" + str(a) + str(b)    def JoinNSM(self, a, b):        return self.__info + str(a) + str(b)if __name__ == "__main__":    print("============")    if hasattr(AttrTest, "JoinSM"):        attr = getattr(AttrTest, "JoinSM")        print(attr)        print(attr('abcde', '12345'))    print("============")    if hasattr(AttrTest, "JoinX"):        attr = getattr(AttrTest, "JoinX")        print(attr)        print(attr('abcde', '12345'))    print("============")    at = AttrTest()    if hasattr(at, "JoinNSM"):        attr = getattr(at, "JoinNSM")        print(attr)        print(attr('abcde', '12345'))    print("============")    if hasattr(AttrTest, "JoinNSM"):        attr = getattr(AttrTest, "JoinNSM")        print(attr)        print(attr(at, 'abcde', '12345'))    print("============")    if hasattr(at, "JoinSM"):        attr = getattr(at, "JoinSM")        print(attr)        print(attr("abcde", "12345"))    print("============")    if hasattr(at, "Info"):        print(getattr(at, "Info"))        setattr(at, "Info", "at:")        print(getattr(at, "Info"))    print("============")    if hasattr(at, "field"):        print(getattr(at, "field"))        setattr(at, "field", "validField")        print(getattr(at, "field"))    print("============")    print("WILL EXIT...")    exit(0)

完。