A gnarly little python loop
showell30 at yahoo.com
Sun Nov 11 18:29:15 CET 2012
On Nov 11, 1:09 am, Paul Rubin <no.em... at nospam.invalid> wrote:
> Cameron Simpson <c... at zip.com.au> writes:
> > | I'd prefer the original code ten times over this inaccessible beast.
> > Me too.
> Me, I like the itertools version better. There's one chunk of data
> that goes through a succession of transforms each of which
> is very straightforward.
Even though I supplied the "inaccessible" itertools version, I can
understand why folks find it inaccessible. As I said to the OP, there
was nothing wrong with the original imperative approach; I was simply
providing an alternative.
It took me a while to appreciate itertools, but the metaphor that
resonates with me is a Unix pipeline. It's just a metaphor, so folks
shouldn't be too literal, but the idea here is this:
page_nums -> pages -> valid_pages -> tweets
The transforms are this:
page_nums -> pages: call API via imap
pages -> valid_pages: take while true
valid_pages -> tweets: use chain.from_iterable to flatten results
Here's the code again for context:
return getSearch(term, page)
page_nums = itertools.count(1)
pages = itertools.imap(get_page, page_nums)
valid_pages = itertools.takewhile(bool, pages)
tweets = itertools.chain.from_iterable(valid_pages)
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