Revert "convert o python3"

This reverts commit 8c2cb92886d718280389a90cf1509e752b672120.
Revert "add python3 packages"

This reverts commit 7d0a1c656f42f8bc8f4fbd71e795bd8b771e1b7a.
Revert "some initial python 2->3 fixes"

This reverts commit 64a3dbc83ad58dc52d995b4461e4b598ce265309.