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Message: [QUOTE="rantingrick, post: 4248594"] py> "{0:-010d}".format(-1234) '-000001234' My point was: Use the {char}{repeat}d format for integers and the {char}{<|>|=}{repeat} for strings. Problem solved. No more need for zfill. py> "{0:0>10}".format(-1234) '00000-1234' What result would you expect from that string argument? I think it behaves as anyone would expect. If you have a str and you want it interpreted as a negative integer then cast it. py> "{0:010d}".format(int("-1234")) '-000001234' If you would like for the spec to handle the case of integers and strings transparently then you need to lobby to have the API changed. Maybe they could add a !i like the !s and !r which would be explicit. However, i don't think implicit coercion of strings to integers is a good idea. Using the int function or !i removes and ambiguities. For me, the spec works just fine as is. [/QUOTE]