为什么csv.DictReader给我一个没有属性错误？

问题描述

我的CSV档案是

  200 
服务
  pre> 
 
 
我输入解释器的代码是
  snav = csv.DictReader（open（screennavigation.csv），delimiter ='，'）
 print snav.fieldnames 
 ['200'] 
 
 ：
 ... print（line）
 ... 
 {'200'：'Service'} 
 
 snav [200] 
回溯（最近最后一次调用）：
在< module>中的文件< stdin>，第1行
 AttributeError：DictReader实例没有属性'__getitem__'
  
我认为 DictReader 用于返回字典。我怀疑我遗漏了一些非常明显的东西。
解决方案
  snav 是 DictReader 实例，不应作为字典访问。在迭代它产生可以相应地访问的字典：你需要 line ['200']  
 
My CSV file is 
200
Service
The code I'm putting into the interpreter is  
snav = csv.DictReader(open("screennavigation.csv"), delimiter=',')
print snav.fieldnames
['200']

for line in snav:
...     print(line)
...
{'200': 'Service'}

snav["200"]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: DictReader instance has no attribute '__getitem__'
I thought that DictReader was meant to return a dictionary. I suspect I'm missing something brutally obvious.
 解决方案 
snav object is DictReader instance and shouldn't be accessed as a dictionary. On iteration it produces dictionaries that could be accessed accordingly: you need line['200']
                        
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