"Upcomping" -> "upcoming" On Mar 31, 2013 2:38 AM, "raymond.hettinger" <python-check...@python.org> wrote:
> http://hg.python.org/cpython/rev/1026b1d47f30 > changeset: 83037:1026b1d47f30 > branch: 2.7 > parent: 83034:e044d22d2f61 > user: Raymond Hettinger <pyt...@rcn.com> > date: Sat Mar 30 23:37:57 2013 -0700 > summary: > Add an itertools recipe showing how to use t.__copy__(). > > files: > Doc/library/itertools.rst | 12 ++++++++++++ > 1 files changed, 12 insertions(+), 0 deletions(-) > > > diff --git a/Doc/library/itertools.rst b/Doc/library/itertools.rst > --- a/Doc/library/itertools.rst > +++ b/Doc/library/itertools.rst > @@ -828,6 +828,18 @@ > indices = sorted(random.randrange(n) for i in xrange(r)) > return tuple(pool[i] for i in indices) > > + def tee_lookahead(t, i): > + """Inspect the i-th upcomping value from a tee object > + while leaving the tee object at its current position. > + > + Raise an IndexError if the underlying iterator doesn't > + have enough values. > + > + """ > + for value in islice(t.__copy__(), i, None): > + return value > + raise IndexError(i) > + > Note, many of the above recipes can be optimized by replacing global > lookups > with local variables defined as default values. For example, the > *dotproduct* recipe can be written as:: > > -- > Repository URL: http://hg.python.org/cpython > > _______________________________________________ > Python-checkins mailing list > python-check...@python.org > http://mail.python.org/mailman/listinfo/python-checkins > >
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