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a, b, c, d, e....

Hey, that's Python, it is easy!

[albaricoque] ~> python
Python 2.5.1 (r251:54863, Jul 30 2007, 20:56:08)
[GCC 3.4.6 [FreeBSD] 20060305] on freebsd6
Type "help", "copyright", "credits" or "license" for more information.
>>> import string
>>> string.lowercase
'abcdefghijklmnopqrstuvwxyz'
>>>

Just import the string module and call the proper method and et voilá!, you are done.

QUICK UPDATE: from betabug do not import the whole string method, instead, import just the lowercase method:

[albaricoque] ~> python
Python 2.5.1 (r251:54863, Jul 30 2007, 20:56:08)
[GCC 3.4.6 [FreeBSD] 20060305] on freebsd6
Type "help", "copyright", "credits" or "license" for more information.
>>> from string import lowercase
>>> lowercase
'abcdefghijklmnopqrstuvwxyz'
>>>

Why? read that to learn more about the reasons.