I've always heard it explained as "decimal", but in any case %i is also accepted for integers.
edit: it's not clear that this is true in python, which I missed (although experimentally it works), but it is true in at least C89, where %d and %i are equivalent for output formats, and in input formats are distinguished by %d accepting only decimal digits numbers, while %i interprets octal and hex (0-, 0x-) numbers as strtol would.
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[ 2.6 ms ] story [ 16.3 ms ] threadI mean, %s for string and %f for float, but how is %d an integer?
edit: it's not clear that this is true in python, which I missed (although experimentally it works), but it is true in at least C89, where %d and %i are equivalent for output formats, and in input formats are distinguished by %d accepting only decimal digits numbers, while %i interprets octal and hex (0-, 0x-) numbers as strtol would.