Josh Rosenberg added the comment:

I find this report nigh incomprehensible, but I will admit that I can't seem to 
find any good explanations of the extended slicing rules in the Python docs.

The tutorial covers slicing, but, AFAICT, it never mentions extended slicing at 
all, not in 3.1.2 or 3.1.3 (Strings and Lists introduction), nor anywhere in 
section 5 (Data structures). 3.1.2 and 3.1.3 even lie a little (claiming the 
implicit start is always 0, and the implicit end is always len(sequence), when 
those reverse for a negative slice step).

The slice object and the slice glossary entry doesn't cover it either, nor link 
to anything that does. The Data model entry for Slicings doesn't seem to 
describe meaning either.

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nosy: +josh.r

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<http://bugs.python.org/issue28882>
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