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Message: [QUOTE="Arnaud Delobelle, post: 3705811"] Well that's easy. I see 'r' didn't answer so I will: only accept tuples on the right hand side of the %, so all arguments have to be put inside a tuple. Traceback (most recent call last): '42' Of course there would still be the possibility of uncaught bugs when people forget to put the argument in a tuple if the argument itself is a tuple of length 1. .... print "foo(%s)" % x .... # should be % (x,) .... foo(1) That's why .format() is a better option IMHO. [/QUOTE]