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computed property.py

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	`1`	`+ng computed property and setting`
	`2`	`+`
	`3`	`+`
	`4`	`+class operators(object):`
	`5`	`+ def __getattr__(self, name):`
	`6`	`+ if name == 'age':`
	`7`	`+ return 40`
	`8`	`+ else:`
	`9`	`+ raise AttributeError(name)`
	`10`	`+`
	`11`	`+ def __setattr__(self, name, value):`
	`12`	`+ print('set: %s %s' % (name, value))`
	`13`	`+ if name == 'age':`
	`14`	`+ self.__dict__['_age'] = value`
	`15`	`+ else:`
	`16`	`+ self.__dict__[name] = value`
	`17`	`+`
	`18`	`+`
	`19`	`+# OR BETTER WAY`
	`20`	`+`
	`21`	`+`
	`22`	`+class properties(object):`
	`23`	`+ def getage(self):`
	`24`	`+ return 40`
	`25`	`+`
	`26`	`+ def setage(self, value):`
	`27`	`+ self._age = value`
	`28`	`+`
	`29`	`+ age = property(getage, setage, None, None)`
	`30`	`+`
	`31`	`+`
	`32`	`+if __name__ == '__main__':`
	`33`	`+ x, y = operators(), properties()`
	`34`	`+ for ins in (x, y):`
	`35`	`+ print(ins.age)`
	`36`	`+ ins.age = 20`
	`37`	`+ print(ins._age)`
	`38`	`+`

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