>>>>> Hendrik van Rooyen <hend...@microcorp.co.za> (HvR) wrote:
>HvR> On Monday 20 July 2009 21:26:07 Phillip B Oldham wrote: >>> On Jul 20, 6:08 pm, Duncan Booth <duncan.bo...@invalid.invalid> wrote: >>> > The main reason why you need both lists and tuples is that because a >>> > tuple of immutable objects is itself immutable you can use it as a >>> > dictionary key. >>> >>> Really? That sounds interesting, although I can't think of any real- >>> world cases where you'd use something like that. >HvR> simplest is something like a point in the cartesian plane with >HvR> an associated attribute like colour. There are numerous other examples. Anytime you need a key that is not a single object but composed of more than one: Name + birthday Street + number + City Student + Course etc. -- Piet van Oostrum <p...@cs.uu.nl> URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4] Private email: p...@vanoostrum.org -- http://mail.python.org/mailman/listinfo/python-list
