On 18 Apr 2005 13:05:57 -0700, "AdSR" <[EMAIL PROTECTED]> wrote:
>Fellow Pythonistas, > >Please check out > >http://spyced.blogspot.com/2005/04/how-well-do-you-know-python-part-3.html > >if you haven't done so yet. It appears that you can specify a function >explicitly to take n-tuples as arguments. It actually works, checked >this myself. If you read the reference manual at >http://docs.python.org/ref/function.html >really carefully, you will find that it is indeed part of the language >spec, but it's a likely candidate for the least advertised Python >feature. Small wonder since it looks like one of those language >features that make committing atrocities an order of magnitude easier. > Thanks for pointing this out. However I see no atrocity potential here -- what did you have in mind? See below. Better documentation in the "def" (even better than having say "year_month_day" instead of my lazy "dt_tup"). No overhead; byte-code is the same. >>> def weird_date_from_tuple(dt_tup): ... year, month, day = dt_tup ... return ... >>> import dis >>> dis.dis(weird_date_from_tuple) 2 0 LOAD_FAST 0 (dt_tup) 3 UNPACK_SEQUENCE 3 6 STORE_FAST 3 (year) 9 STORE_FAST 1 (month) 12 STORE_FAST 2 (day) 3 15 LOAD_CONST 0 (None) 18 RETURN_VALUE >>> def weird_date_from_tuple((year, month, day)): ... return ... >>> dis.dis(weird_date_from_tuple) 1 0 LOAD_FAST 0 (.0) 3 UNPACK_SEQUENCE 3 6 STORE_FAST 1 (year) 9 STORE_FAST 2 (month) 12 STORE_FAST 3 (day) 2 15 LOAD_CONST 0 (None) 18 RETURN_VALUE >>> Cheers, John -- http://mail.python.org/mailman/listinfo/python-list
