Implementing dictionary derivation in Python2.6 version PEP 274 (Dict comprehensions) _python

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.

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

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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

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#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 '}

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#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 '}