「With」語句在Python中有多個文件可處理

Question

在這種情況下，我如何使用with語句？

f_spam = open(spam,'r') 
f_bar = open(eggs,'r') 
... 
do something with these files 
... 
f_spam.close() 
f_bar.close() 

文件編號可能大於2。

Answer 1

你也可以這樣做：

from contextlib import nested 

with nested(open(spam), open(eggs)) as (f_spam, f_eggs): 
    # do something 

在Python 2.7和3.1+你不需要nested功能，因爲with支持的語法如下：

with open(spam) as f_spam, open(eggs) as f_eggs: 
    # do something 

Answer 2

with open(spam,'r') as f_spam: 
    with open(eggs,'r') as f_bar: 
    #do stuff with each