> OFFSET:LENGTH vs. OFFSET:OFFSET may be purely semantics.

doesn't seem so.

https://docs.python.org/3/glossary.html#term-slice

slice
An object usually containing a portion of a sequence. A slice is creat
+ed using the subscript notation, [] with 
colons between numbers when several are given, such as in variable_nam
+e[1:3:5]. The bracket (subscript) notation
uses slice objects internally.

[download]

https://docs.python.org/3/library/functions.html#slice

class slice(stop)
class slice(start, stop, step=1)
Return a slice object representing the set of indices specified by ran
+ge(start, stop, step). The start and step 
arguments default to None. 

...

[download]

something is off (-set ;) with this test suite. Unfortunately I have no Python at hand to test ...

updates

references and citations updated

Cheers Rolf
(addicted to the 𐍀𐌴𐍂𐌻 Programming Language :)
Wikisyntax for the Monastery

In reply to Re^6: Converting python list range expressions to perl by LanX
in thread Converting python list range expressions to perl by ibm1620

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