我怎么能动态地引用变量在Python

Question

看哪，我的简单的类：

import sys 

class Foo(object): 

    def __init__(self): 
    self.frontend_attrs = ['name','ip_address','mode','port','max_conn'] 
    self.backend_attrs = ['name','balance_method','balance_mode'] 

init方法上面创建了两个名单，我想动态是指他们两个：

def sanity_check_data(self): 
    self.check_section('frontend') 
    self.check_section('backend') 

def check_section(self, section): 
    # HERE IS THE DYNAMIC REFERENCE 
    for attr in ("self.%s_attrs" % section): 
    print attr 

但当我这样做时，python会抱怨("self.%s_attrs" % section)的调用。

我读过有关使用get_attr动态发现模块人...

getattr(sys.modules[__name__], "%s_attrs" % section)() 

可这对词典进行。

Answer 1

你在找什么我认为是getattr()。事情是这样的：

def check_section(self, section): 
    for attr in getattr(self, '%s_attrs' % section): 
     print attr 

虽然与该特定情况下，你可能会用的字典更好，只是为了让事情变得简单：

class Foo(object): 

    def __init__(self): 
    self.my_attrs = { 
     'frontend': ['name','ip_address','mode','port','max_conn'], 
     'backend': ['name','balance_method','balance_mode'], 
    } 

    def sanity_check_data(self): 
    self.check_section('frontend') 
    self.check_section('backend') 

    def check_section(self, section): 
    # maybe use self.my_attrs.get(section) and add some error handling? 
    my_attrs = self.my_attrs[section] 
    for attr in my_attrs: 
     print attr