Giacomo Alzetta added the comment: Note that the documentation for formatting with %, found here: http://docs.python.org/2/library/stdtypes.html#string-formatting-operations, states:
""" If format requires a single argument, values may be a single non-tuple object. [5] Otherwise, values must be a tuple with exactly the number of items specified by the format string, or a single mapping object (for example, a dictionary).""" Note how it explicitly states that in an expression: format % value there are two different cases: - If format contains *exactly one* format specifier, then value can be any non-tuple item and it will be formatted as is. Otherwise, value MUST be either tuple or a mapping. In your example '' contains 0 format specifiers, hence you MUST use either a tuple or a dict. Any other object triggers "undefined behaviour"(in particular depending on whether the object define __geitem__ or not the formatting might or might not raise an exception etc.) AFAIK only few people know this, hence changing the code could potentially break a lot of code for apparently no reason. Since people should start to move to str.format instead of % this wart may not be worth fixing. ---------- nosy: +bakuriu _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue18750> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
