mirror of https://github.com/python/cpython
Various corrections
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@ -63,7 +63,7 @@ what it can, adding compatibility functions in a
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usages that will become unsupported in 3.0.
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usages that will become unsupported in 3.0.
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Some significant new packages have been added to the standard library,
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Some significant new packages have been added to the standard library,
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such as the :mod:`multiprocessing` and :mod:`jsonlib` modules, but
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such as the :mod:`multiprocessing` and :mod:`json` modules, but
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there aren't many new features that aren't related to Python 3.0 in
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there aren't many new features that aren't related to Python 3.0 in
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some way.
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some way.
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@ -2014,16 +2014,16 @@ changes, or look through the Subversion logs for all the details.
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others, the missing values are set to *fillvalue*. For example::
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others, the missing values are set to *fillvalue*. For example::
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itertools.izip_longest([1,2,3], [1,2,3,4,5]) ->
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itertools.izip_longest([1,2,3], [1,2,3,4,5]) ->
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[(1, 1), (2, 2), (3, 3), (None, 4), (None, 5)]
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(1, 1), (2, 2), (3, 3), (None, 4), (None, 5)
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``product(iter1, iter2, ..., [repeat=N])`` returns the Cartesian product
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``product(iter1, iter2, ..., [repeat=N])`` returns the Cartesian product
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of the supplied iterables, a set of tuples containing
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of the supplied iterables, a set of tuples containing
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every possible combination of the elements returned from each iterable. ::
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every possible combination of the elements returned from each iterable. ::
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itertools.product([1,2,3], [4,5,6]) ->
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itertools.product([1,2,3], [4,5,6]) ->
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[(1, 4), (1, 5), (1, 6),
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(1, 4), (1, 5), (1, 6),
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(2, 4), (2, 5), (2, 6),
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(2, 4), (2, 5), (2, 6),
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(3, 4), (3, 5), (3, 6)]
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(3, 4), (3, 5), (3, 6)
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The optional *repeat* keyword argument is used for taking the
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The optional *repeat* keyword argument is used for taking the
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product of an iterable or a set of iterables with themselves,
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product of an iterable or a set of iterables with themselves,
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@ -2031,39 +2031,39 @@ changes, or look through the Subversion logs for all the details.
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are returned::
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are returned::
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itertools.product([1,2], repeat=3) ->
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itertools.product([1,2], repeat=3) ->
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[(1, 1, 1), (1, 1, 2), (1, 2, 1), (1, 2, 2),
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(1, 1, 1), (1, 1, 2), (1, 2, 1), (1, 2, 2),
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(2, 1, 1), (2, 1, 2), (2, 2, 1), (2, 2, 2)]
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(2, 1, 1), (2, 1, 2), (2, 2, 1), (2, 2, 2)
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With two iterables, *2N*-tuples are returned. ::
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With two iterables, *2N*-tuples are returned. ::
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itertools.product([1,2], [3,4], repeat=2) ->
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itertools.product([1,2], [3,4], repeat=2) ->
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[(1, 3, 1, 3), (1, 3, 1, 4), (1, 3, 2, 3), (1, 3, 2, 4),
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(1, 3, 1, 3), (1, 3, 1, 4), (1, 3, 2, 3), (1, 3, 2, 4),
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(1, 4, 1, 3), (1, 4, 1, 4), (1, 4, 2, 3), (1, 4, 2, 4),
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(1, 4, 1, 3), (1, 4, 1, 4), (1, 4, 2, 3), (1, 4, 2, 4),
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(2, 3, 1, 3), (2, 3, 1, 4), (2, 3, 2, 3), (2, 3, 2, 4),
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(2, 3, 1, 3), (2, 3, 1, 4), (2, 3, 2, 3), (2, 3, 2, 4),
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(2, 4, 1, 3), (2, 4, 1, 4), (2, 4, 2, 3), (2, 4, 2, 4)]
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(2, 4, 1, 3), (2, 4, 1, 4), (2, 4, 2, 3), (2, 4, 2, 4)
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``combinations(iterable, r)`` returns sub-sequences of length *r* from
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``combinations(iterable, r)`` returns sub-sequences of length *r* from
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the elements of *iterable*. ::
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the elements of *iterable*. ::
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itertools.combinations('123', 2) ->
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itertools.combinations('123', 2) ->
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[('1', '2'), ('1', '3'), ('2', '3')]
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('1', '2'), ('1', '3'), ('2', '3')
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itertools.combinations('123', 3) ->
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itertools.combinations('123', 3) ->
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[('1', '2', '3')]
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('1', '2', '3')
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itertools.combinations('1234', 3) ->
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itertools.combinations('1234', 3) ->
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[('1', '2', '3'), ('1', '2', '4'), ('1', '3', '4'),
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('1', '2', '3'), ('1', '2', '4'), ('1', '3', '4'),
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('2', '3', '4')]
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('2', '3', '4')
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``permutations(iter[, r])`` returns all the permutations of length *r* of
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``permutations(iter[, r])`` returns all the permutations of length *r* of
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the iterable's elements. If *r* is not specified, it will default to the
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the iterable's elements. If *r* is not specified, it will default to the
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number of elements produced by the iterable. ::
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number of elements produced by the iterable. ::
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itertools.permutations([1,2,3,4], 2) ->
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itertools.permutations([1,2,3,4], 2) ->
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[(1, 2), (1, 3), (1, 4),
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(1, 2), (1, 3), (1, 4),
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(2, 1), (2, 3), (2, 4),
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(2, 1), (2, 3), (2, 4),
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(3, 1), (3, 2), (3, 4),
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(3, 1), (3, 2), (3, 4),
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(4, 1), (4, 2), (4, 3)]
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(4, 1), (4, 2), (4, 3)
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``itertools.chain(*iterables)`` is an existing function in
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``itertools.chain(*iterables)`` is an existing function in
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:mod:`itertools` that gained a new constructor in Python 2.6.
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:mod:`itertools` that gained a new constructor in Python 2.6.
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@ -2073,7 +2073,7 @@ changes, or look through the Subversion logs for all the details.
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all the elements of the second, and so on. ::
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all the elements of the second, and so on. ::
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chain.from_iterable([[1,2,3], [4,5,6]]) ->
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chain.from_iterable([[1,2,3], [4,5,6]]) ->
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[1, 2, 3, 4, 5, 6]
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1, 2, 3, 4, 5, 6
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(All contributed by Raymond Hettinger.)
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(All contributed by Raymond Hettinger.)
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