om the version number.

:parameter name: is converted to a standard distribution name by replacing
                 any runs of non- alphanumeric characters with a single
                 ``'-'``.
:type name: string
:parameter version: is converted to a standard version string. Spaces
                    become dots, and all other non-alphanumeric characters
                    (except dots) become dashes, with runs of multiple
                    dashes condensed to a single dash.
:type version: string
:returns: directory name
:rtype: string