Implementing dictionary derivation in Python2.6 version PEP 274

Source: Internet
Author: User
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This article mainly introduces the Python2.6 version of the implementation of dictionary derivation PEP 274 (Dict comprehensions), this paper gives the expression and for-loop writing two ways to achieve character derivation, the need for friends can refer to the following

I have encountered a time before, this period in the group also encountered a few times a problem

A program written in python2.7 uses dictionary derivation, but the server version is python2.6 and cannot be run.

Today I checked the dict comprehensions, there is a clear explanation in pep274.

The code is as follows:

Implementation

All implementation details were resolved in the Python 2.7 and 3.0

Time-frame.

This is only added after 2.7.

In the 2.6 version of how we use it, in fact, with a For loop to solve the good

The code is as follows:

#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 '}

The code is as follows:

#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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