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Python2.6版本中实现字典推导 PEP 274(Dict Comprehensions)

WBOY
WBOYOriginal
2016-06-10 15:14:111301browse

之前自己也遇到过一次,这段时间在群里也遇到过几次的一个问题
用python2.7写的一段程序,里面用到了字典推导式,但是服务器版本是python2.6,无法运行。

今天查了下关于Dict Comprehensions,在pep274中有明确的说明。

http://legacy.python.org/dev/peps/pep-0274/

复制代码 代码如下:

Implementation
    All implementation details were resolved in the Python 2.7 and 3.0
    time-frame.

这个是从2.7之后才加上的。

2.6版本中我们怎么用呢,其实用一个for循环来解决就好了

复制代码 代码如下:

#表达式写法 
In [4]: print {i : chr(65+i) for i in range(4)} 
{0: 'A', 1: 'B', 2: 'C', 3: 'D'} 

复制代码 代码如下:

#for循环写法 
In [5]: d = {} 
 
In [6]: for i in range(4): 
   ...:     d[i] = chr(65+i) 
   ...: 
 
In [7]: print d 
{0: 'A', 1: 'B', 2: 'C', 3: 'D'} 
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