On Sat, Aug 25, 2012 at 11:53 AM, <aklei...@sonic.net> wrote: > > Put each entry on its own line, indented by two spaces, and leave a > trailing comma on the last entry. The latter is especially important > in sequences of strings to prevent them from being > "silently"<=>"concatenated" if you were to add an entry and forget the > comma. > """ > > When I first saw this I thought it would lead to a syntax error so tried > it out.. > Then played with it to try to recreate the '"silently"<=>"concatenated"' > problem but couldn't. I like this syntax because it avoids the syntax > error if the comma is omitted when adding an entry but I don't understand > the (potential) concatenation problem. > > Could you explain please?
Sure, I said the problem is with "sequences", not mappings. The syntax for a dictionary will catch the mistake. But try it with a list. x = [ "string1", "string2", "string3" # no comma ] Later you decide to add "string4" but forget to add the comma: x = [ "string1", "string2", "string3" # no comma "string4" ] Result: ['string1', 'string2', 'string3string4'] _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
