I understand the concept, but no real use case comes to my mind, and certainly I personally have not needed this. Itertools is kept extremely minimal by design, containing only a small set of orthogonal primitives. The recipes in its docs contain others, as does more-itertools. This feels like something that belongs, perhaps, in more-itertools.
On Wed, Dec 9, 2020 at 4:17 AM <aurelien.lambert...@gmail.com> wrote: > Hi > > I like using itertools for creating long strings while not paying the cost > of intermediate strings (by eventually calling str.join on the whole > iterator). > However, one missing feature is to mimic the behavior of str.join as an > iterator: an iterator that returns the items of an iterable, separated by > the separator. > I suggest name "interleave" or "join" (whichever is the most clear / least > ambigous). > > def interleave(sep, iterable): > """ > Makes an iterator that returns elements from an iterable, > separated by the separator. > """ > notfirst = False > for i in iterable: > if notfirst: > yield sep > else: > notfirst = True > yield i > > Could imagine a more elaborate implementation that can take several > iterators, and would be equivalent to > lambda chain_zip_interleave sep, *iterables: > itertools.chain.from_iterable(interleave((sep,), zip(*iterables))) > But that may be seriously overkill, and I have hard time describing it. > _______________________________________________ > Python-ideas mailing list -- python-ideas@python.org > To unsubscribe send an email to python-ideas-le...@python.org > https://mail.python.org/mailman3/lists/python-ideas.python.org/ > Message archived at > https://mail.python.org/archives/list/python-ideas@python.org/message/YWT5BVGPNO3UBW4DZYYPXVCJY2JH7B4H/ > Code of Conduct: http://python.org/psf/codeofconduct/ > -- The dead increasingly dominate and strangle both the living and the not-yet born. Vampiric capital and undead corporate persons abuse the lives and control the thoughts of homo faber. Ideas, once born, become abortifacients against new conceptions.
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