... this makes sense at some wacky level.

For me, the semantic sense is that in a 0-based array, the length of the array can be used to represent its highest index. A D example: 

import std.stdio;

void main () {

    auto ra = [ 'a', 'b', 'c', 'd', 'e', ];

    writefln("length of ra is %s", ra.length);
    writeln();

    write("A:  ");
    foreach (i;  0 .. ra.length) {
        writef("'%s' @ index %d  ", ra[i], i);
        }
    writeln();

    write("B:  ");
    foreach (i, e;  ra[ 0 .. $ ]) {
        writef("ra[%d] == '%s'  ", i, e);
        }
    writeln();

    write("C:  ");
    foreach (i, e;  ra) {
        writef("ra[%d] == '%s'  ", i, e);
        }

    }

[download]
Output: 
C:\@Work\DMD2\posts\davido>    python_to_d_1
length of ra is 5

A:  'a' @ index 0  'b' @ index 1  'c' @ index 2  'd' @ index 3  'e' @ 
+index 4
B:  ra[0] == 'a'  ra[1] == 'b'  ra[2] == 'c'  ra[3] == 'd'  ra[4] == '
+e'
C:  ra[0] == 'a'  ra[1] == 'b'  ra[2] == 'c'  ra[3] == 'd'  ra[4] == '
+e'

[download]
(The expression  ra[ 0 .. $ ] is shorthand for  ra[ 0 .. ra.length ])

Give a man a fish:  <%-{-{-{-<

In reply to Re^4: [Way OT] Python to D. by AnomalousMonk
in thread [OT] Python to Perl. by BrowserUk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.