Optimizing multiple dispatch

Carl Banks imbosol at aerojockey.com
Fri Jun 4 00:42:52 CEST 2004

Jeff Epler <jepler at unpythonic.net> wrote in message news:<mailman.547.1086270969.6949.python-list at python.org>...
> Avoding map() may help:
>     tuple([type(a) for a in args])
> ... hmm, map is faster than listcomp.  my mistake!

Rule of thumb: listcomp is only faster than map if it avoids an extra
function call.  So, for example, "[ x+1 for x in xs ]" is probably
faster than "map(lambda x:x+1,xs)".

But, since this particular use doesn't avoid a function call, the map
is faster.


More information about the Python-list mailing list