Re^6: Converting python list range expressions to perl

Here's one:

    [\@test_array, '[3:4]', 'd'],
[download]

In my OP I mentioned needing help from "bilingual" (i.e. Perl and Python) people; otherwise I'd have included a description of Python's slice notation. I'm sorry if this was negligence on my part, but I assumed that anyone answering would be familiar with Python's oddball slice semantics. [a:b] means "the characters starting at offset a and ending at offset b-1". Unless a or b is negative in which case .. hell, I don't remember ;-)

The code I posted correctly slices arrays using Pythonic parameters, although it doesn't attempt to handle the optional third argument, a step value. And I'm happy to say that the translation effort has succeeded and Perl is now churning out gibberish sonnets at a much faster rate than its Python equivalent.

Update:

It correctly slices arrays if the arguments aren't nonsensical -- like being out of range, which Python forgives. It needs a few more sanity tests to handle those cases.

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Re^7: Converting python list range expressions to perl by LanX (Saint) on Dec 05, 2022 at 22:11 UTC
> Unless a or b is negative in which case .. hell, I don't remember ;-) AFAIR from a previous discussion is Perl using closed intervals while Python using half open ones. That means the end point is excluded in Python. One advantage is that `[:X]` and `[X:]` are splitting an interval including X exactly into two dijoint parts, without needing to decrement the first end boundary. I.O.W always `$end--` when translating to Perl. Cheers Rolf _{(addicted to the 𐍀𐌴𐍂𐌻 Programming Language :) Wikisyntax for the Monastery}	[reply] [d/l] [select]
Re^8: Converting python list range expressions to perl by ibm1620 (Hermit) on Dec 05, 2022 at 22:58 UTC
Personally I prefer offset/length-type expressions, as in substr(), to begin/end expressions of Perl slices and Python ranges, especially when it comes to the way negative values work. I'm sure it's just a matter of familiarity, though.	[reply]


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