Thanks for the clarification. Now it is clear. ak > 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'] > >
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