python - 反射，,通过字符串的形式操作

python - 反射，,通过字符串的形式操作

通过字符串的形式操作对象的成员，叫做反射。

class Foo:    def __init__(self,name,age):        self.name = name        self.age = age    def show(self):        return (‘{} - {}‘.format(self.name,self.age))obj = Foo(‘test_name‘,34)print (getattr(obj,‘name‘))print (hasattr(obj,‘age‘))setattr(obj,‘k1‘,‘v1‘)print (getattr(obj,‘k1‘))delattr(obj,‘age‘)print (getattr(obj,‘age‘))# test_name# print (getattr(obj,‘age‘))# True# AttributeError: ‘Foo‘ object has no attribute ‘age‘# v1

getattr

hasattr

setattr

delattr

class Foo:    def index(self):        return ‘index‘    def new(self):        return (‘is new page‘)    def test(self):        return (‘is test page‘)f = Foo()while True:    input_str = input(‘Please input URL: ‘)    if input_str == ‘back‘ or input_str == ‘b‘:        break    if hasattr(f,input_str):        get_func = getattr(f,input_str)        print (get_func())    else:        print (‘404 page‘)

python - 反射