mystery string code - help!

Uncle Ben ben at greenba.com
Wed Apr 20 12:48:30 EDT 2011

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I found this in one of the online cookbooks:
#Raghunath Reddy Peesari 6 years, 3 months ago # | flag
#There is more simple way. ###
a = 'abcdefghi'
a = a[::-1]
print a
>>> 'ihgfedcba'

As a newbie Pythoner, I understand [] -1]
but would some tell me how '::' does its magic?
Uncle Ben

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