mystery string code - help!

Uncle Ben ben at
Wed Apr 20 18:48:30 CEST 2011

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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