sympy/sympy — pull request #876 by SgtMook (2011-12-22 05:47:03+00:00)
Title: Improved doctest coverage for combinatorics

Improved doctest coverage for combinatorics

Added doctests and documentations where it was missing. Made two methods in permutations and another in subsets private, as they are defined and used only inside another method. Two methods in subsets are still not implemented, and have no documentation/doctest.

GCI Task: http://www.google-melange.com/gci/task/view/google/gci2011/7230272