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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')