Efraim Flashner <efr...@flashner.co.il> writes: > On Wed, 03 Feb 2016 09:47:15 +0100 > l...@gnu.org (Ludovic Courtès) wrote: > >> l...@gnu.org (Ludovic Courtès) skribis: >> >> > An idea I haven’t taken the time to test yet would be to use >> > ‘properties’: >> > >> > (define python-foobar ;with Python 3 >> > (package >> > (name "foobar") >> > ;; Specify which Python 2 variant to use. >> > (properties `((python2-variant . ,(delay python2-foobar)))))) > > This part I don't get. What's the period for?
The “properties” field holds a regular alist. Here the alist has one entry (a pair) with a symbol “python2-variant” as the key, and “,(delay python2-foobar)” as its value. The period is needed for the “dotted list” syntax, which is used to distinguish a pair (or an improper list) from a well-formed list. ~~ Ricardo
