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| 19:26 |
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| 19:30 |
mikemol |
I know Python and Perl 6 are capable of some similar things in terms of lazy lists. |
| 19:30 |
mikemol |
I have some questions on the specifics, though. |
| 19:31 |
mikemol |
First, in Perl 6, you have the ability to say my @list := some_func_which_always_returns_a_value; |
| 19:32 |
mikemol |
I know Python has the concept of generators, but I don't know that that's demonstrated anywhere on RC. |
| 19:32 |
mikemol |
I can see how that would work for infinite series, but what about finite series? |
| 19:33 |
mikemol |
In those languages, how would one take mechanisms like those and return a dynamically-generated, finite list? |
| 19:33 |
soniakeys |
a search for yield turns up a few python programs |
| 19:34 |
mikemol |
So if I have a method which uses 'yield' to provide a return, how do make that method the object of a foreach? Also, how do I have that case signal the end of a sequence? |
| 19:37 |
soniakeys |
i don't remember my python so well. looking... |
| 19:39 |
Hypftier |
In C# you can use yield break to stop emitting things (thereby ending the sequence) and if you use yield return and yield break to build an iterator then the end is implied by letting control flow outside of that. Could be similar in Python. |
| 19:39 |
soniakeys |
there's this __iter__() thing |
| 19:40 |
mikemol |
Hypftier: I was wondering about that. |
| 19:40 |
mikemol |
Exploring the code from [[List comprehensions]] |
| 19:40 |
fedaykin |
http://rosettacode.org/wiki/List_comprehensions |
| 19:40 |
mikemol |
http://codepad.org/vrTgKUmq |
| 19:41 |
fedaykin |
"Python code - 3 lines - codepad" |
| 19:41 |
soniakeys |
raise StopIteration that's it |
| 19:43 |
Hypftier |
[List_comprehensions#Iterator] is wrong, right? Given that it violates the second criterion, i.e. no nested loops. |
| 19:43 |
Hypftier |
[[List_comprehensions#Iterator]] |
| 19:43 |
fedaykin |
http://rosettacode.org/wiki/List_comprehensions#Iterator |
| 19:46 |
mikemol |
'raise' is Python's means of throwing an exception? |
| 19:46 |
Hypftier |
*nods* |
| 19:50 |
TimToady |
for Perl6's gather/take, you just return out of the gather any which way you like |
| 19:57 |
mikemol |
Ok, the upload spam is getting ridiculous. |
| 19:59 |
sorear |
leaving via CORE::exit probably won't help though. |
| 20:02 |
mikemol |
Ok, hopefully that will fix it. |
| 20:03 |
mikemol |
In LocalSettings.php, I had: $wgFileExtensions = array_diff(array('jpg'), $wgFileExtensions); |
| 20:03 |
mikemol |
That was supposed to remove 'jpg' from $wgFileExtensions. Unfortunately, the array_diff returned array(). Switching the order of the arguments fixed that. |
| 20:08 |
sorear |
hmm |
| 20:09 |
sorear |
niecza: my @list := gather { take 1; goto "OUT" }; say @list; OUT: say "out!" |
| 20:09 |
p6eval |
niecza v6-56-g84360d1: OUTPUT«Unhandled exception: Illegal control operator: goto(OUT, dynamic) at /home/p6eval/niecza/lib/CORE.setting line 538 (CORE _lexotic @ 2)  at /home/p6eval/niecza/lib/CORE.setting line 543 (CORE goto @ 2)  at /tmp/dpUEZ3S0Qq line 1 (MAIN C1_ANON @ 2)  at |
| 20:09 |
p6eval |
../home/p6eval/niecza/lib… |
| 20:11 |
sorear |
niecza: my @list; try { @list := gather { die "pie" } }; say "out"; ?@list; take 2 |
| 20:11 |
p6eval |
niecza v6-56-g84360d1: OUTPUT«outUnhandled exception: pie at /home/p6eval/niecza/lib/CORE.setting line 513 (CORE die @ 2)  at /tmp/oOjjcjJn0e line 1 (MAIN C2_ANON @ 1)  at /home/p6eval/niecza/lib/CORE.setting line 913 (CORE GatherIterator.reify @ 5)  at line 0 (ExitRunloop @ 0)  at |
| 20:11 |
p6eval |
../tmp/oOjjcjJn0e l… |
| 20:50 |
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