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17242398
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2013-06-21T18:53:07.830
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2013-06-21T19:05:08.177
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2013-06-21T19:05:08.177
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Here is an adapted version of the roundrobin recipe from the <a href="http://docs.python.org/2/library/itertools.html#recipes" rel="nofollow">itertools documentation</a> that should do what you want: <pre><code>from itertools import cycle, islice def merge(a, b, pos): "merge('ABCDEF', [1,2,3], 3) --> A B 1 C D 2 E F 3" iterables = [iter(a)]*(pos-1) + [iter(b)] pending = len(iterables) nexts = cycle(iter(it).next for it in iterables) while pending: try: for next in nexts: yield next() except StopIteration: pending -= 1 nexts = cycle(islice(nexts, pending)) </code></pre> Example: <pre><code>>>> list(merge(xrange(1, 9), 'abc', 3)) # note that this works for any iterable! [1, 2, 'a', 3, 4, 'b', 5, 6, 'c', 7, 8] </code></pre> Or here is how you could use <code>roundrobin()</code> as it is without any modifications: <pre><code>>>> x = [1,2,3,4,5,6,7,8] >>> y = ['a','b','c'] >>> list(roundrobin(*([iter(x)]*2 + [y]))) [1, 2, 'a', 3, 4, 'b', 5, 6, 'c', 7, 8] </code></pre> Or an equivalent but slightly more readable version: <pre><code>>>> xiter = iter(x) >>> list(roundrobin(xiter, xiter, y)) [1, 2, 'a', 3, 4, 'b', 5, 6, 'c', 7, 8] </code></pre> Note that both of these methods work with any iterable, not just sequences. Here is the original <code>roundrobin()</code> implementation: <pre><code>from itertools import cycle, islice def roundrobin(*iterables): "roundrobin('ABC', 'D', 'EF') --> A D E B F C" # Recipe credited to George Sakkis pending = len(iterables) nexts = cycle(iter(it).next for it in iterables) while pending: try: for next in nexts: yield next() except StopIteration: pending -= 1 nexts = cycle(islice(nexts, pending)) </code></pre>
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