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
steven Michalske added the comment:
Argh, I swear I proofread this...
print([a[x] for x in [slice(y+3, y-1, -1) for y in range(0, len(a), 4)]])
[[], [7, 7, 6, 5]]
Catching my explicit case, I changed my code to:
print([a[x] for x in [slice(y+3, y-1 if y > 1 else None, -1) for y in range(0,
New submission from steven Michalske:
The slicing and using inputed math is is necessary to provide a special case to
make the code behave as expected.
Unless I'm missing something. Like we can't do this, as we loose negative
indexing from the end of the file?
Let's take the following
