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| author | Raymond Hettinger <python@rcn.com> | 2009-04-10 04:25:45 (GMT) |
|---|---|---|
| committer | Raymond Hettinger <python@rcn.com> | 2009-04-10 04:25:45 (GMT) |
| commit | f368fbc24e1b3a554068774745761d2876443e9a (patch) | |
| tree | 20c8180a1b256604b6c3a8e0e12e4c1e22e8737b /Doc | |
| parent | 3f5a0b33167504427b19ea435bba37bf14e1aee1 (diff) | |
| download | cpython-f368fbc24e1b3a554068774745761d2876443e9a.zip cpython-f368fbc24e1b3a554068774745761d2876443e9a.tar.gz cpython-f368fbc24e1b3a554068774745761d2876443e9a.tar.bz2 | |
Clarify the table entries for combinatorics.
Diffstat (limited to 'Doc')
| -rw-r--r-- | Doc/library/itertools.rst | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/Doc/library/itertools.rst b/Doc/library/itertools.rst index 0b79072..85baaa3 100644 --- a/Doc/library/itertools.rst +++ b/Doc/library/itertools.rst @@ -66,14 +66,19 @@ operator can be mapped across two vectors to form an efficient dot-product: **Combinatoric generators:** - ===================================== ==================== ================================================= - Iterator Arguments Results - ===================================== ==================== ================================================= - :func:`product` p, q, ... [repeat=1] cartesian product - :func:`permutations` p[, r] r-length permutations (without repeated elements) - :func:`combinations` p[, r] r-length combinations (sorted and no repeats) - :func:`combinations_with_replacement` p[, r] r-length combinations (sorted but with repeats) - ===================================== ==================== ================================================= + ============================================== ==================== ============================================================= + Iterator Arguments Results + ============================================== ==================== ============================================================= + :func:`product` p, q, ... [repeat=1] cartesian product, equivalent to a nested for-loop + :func:`permutations` p[, r] r-length tuples, all possible orderings, no repeated elements + :func:`combinations` p[, r] r-length tuples, in sorted order, no repeated elements + :func:`combinations_with_replacement` p[, r] r-length tuples, in sorted order, with repeated elements + | + ``product('ABCD', repeat=2)`` ``AA AB AC AD BA BB BC BD CA CB CC CD DA DB DC DD`` + ``permutations('ABCD', 2)`` ``AB AC AD BA BC BD CA CB CD DA DB DC`` + ``combinations('ABCD', 2)`` ``AB AC AD BC BD CD`` + ``combinations_with_replacement('ABCD', 2)`` ``AA AB AC AD BB BC BD CC CD DD`` + ============================================== ==================== ============================================================= .. _itertools-functions: |