{"comment":{"created_at":"2011-10-10T16:06:36Z","body":"@pernici, btw, to use python 3, you have to run bin/use2to3 and then use sympy from the (newly created) sympy-py3k directory. So you'd want \"python3 sympy-py3k/bin/test\". This information is in the README file now, but I admit it's not very obvious. Otherwise, finishing issue 2619 (give better messages on unsupported Pythons) will also make that more obvious.","updated_at":"2011-10-10T16:06:36Z","url":"https://api.github.com/repos/sympy/sympy/issues/comments/2348971","id":2348971,"user":{"avatar_url":"https://secure.gravatar.com/avatar/2f3fd305b9425ae54fb8ecb891afc6dc?d=https://a248.e.akamai.net/assets.github.com%2Fimages%2Fgravatars%2Fgravatar-140.png","url":"https://api.github.com/users/vperic","id":688281,"login":"vperic"}},"action":"created","issue":{"number":635,"created_at":"2011-10-07T14:44:48Z","pull_request":{"diff_url":"https://github.com/sympy/sympy/pull/635.diff","patch_url":"https://github.com/sympy/sympy/pull/635.patch","html_url":"https://github.com/sympy/sympy/pull/635"},"body":"Added the successor methods next_lex, next_nonlex, next_trotterjohnson\r\n\r\nAdded isCommutingWith method to test if two permutations are commuting\r\n\r\nLow level functions on permutations represented directly on lists:\r\nperm_af_parity parity of a list representing a permutation\r\nperm_af_mul multiplication of permutations as lists (e.g. on permutations\r\nof size 8 it is 3x faster than `__mul__`)\r\n\r\nAdded transpositions method and conjugate method.\r\n\r\nsmall optimizations in  `__mul__`,  `__invert__` , avoiding using the size property\r\n\r\nModified ranks to return int.\r\n\r\nReorganized tests, added some.","comments":9,"title":"Permutation successors; isCommutingWith; transpositions; conjugate","updated_at":"2011-10-10T16:06:37Z","url":"https://api.github.com/repos/sympy/sympy/issues/635","id":1844312,"assignee":null,"milestone":null,"closed_at":null,"user":{"avatar_url":"https://secure.gravatar.com/avatar/06e8f668ca62cbe8a49b53bede84dec1?d=https://a248.e.akamai.net/assets.github.com%2Fimages%2Fgravatars%2Fgravatar-140.png","url":"https://api.github.com/users/pernici","id":759243,"login":"pernici"},"html_url":"https://github.com/sympy/sympy/issues/635","labels":[],"state":"open"},"legacy":{"issue_id":1844312,"comment_id":2348971}}