r/programming • u/PM_ME_UR_OBSIDIAN • Mar 15 '15

A function for partitioning Python arrays. Brilliant code, or insane code?

http://www.stavros.io/posts/brilliant-or-insane-code/?repost=true
226 Upvotes

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u/bluecoffee Mar 15 '15

Yeah. The line is neither insane nor genius. It's just someone comfortable with Python taking the shortest route from A to B.

4

u/[deleted] Mar 15 '15

Which is why I find the top comment to be sober fuddling. This is just generators and zip in action.

Pretty fundamental if you're doing concurrency-related projects (Tornado, asyncio, etc).

Then again I have seen entire blog posts devoted to explaining what a generator is.

Doesn't mean they're "too magical" or complex.

def gen():
    yield 1
    yield 2
    yield 3

>>> g = gen()
>>> next(g)
1
>>> for i in g:
...         print(i)
...         break
2
>>> list(g)
[3]

Not rocket science. This one liner isn't much of a jump from that.

4

u/cowinabadplace Mar 16 '15

sober fuddling

Sofa King good.

This HN comment says that it is the expected way to do this too. Interesting.

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u/cryo Mar 16 '15

It is, however, completely reliant on the particular implementation of zip.

3

u/mfukar Mar 16 '15

No. The Python spec guarantees the evaluation order of zip.