when you use the 3rd element, it's called the extended slice syntax.
here are a few more examples:
>>> x = 'python programming'
>>> x[::-1]
'gnimmargorp nohtyp'
>>> x[2:12:2]
'to rg'
>>>
ironically, this feature has been available in the interpreter for
many years, but it wasn't until circa 2.3 that it was available via
Python syntax. it was also odd that i could use the extended slice
syntax with Jython (formerly JPython) 1.1 when it wasn't available in
the standard C Python back in the day.
hope this helps!
-- wesley
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"Core Python Programming", Prentice Hall, (c)2007,2001
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wesley.j.chun :: wescpy-at-gmail.com
python training and technical consulting
cyberweb.consulting : silicon valley, ca
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