Arguments

 

format_spec

   Characters to be written literally to the output or converted as
   specified in the . . . arguments.
 

 . . .

   Optional expressions whose resultant types correspond to
   conversion specifications given in the format specification.

   If no conversion specifications are given, you may omit the
   output sources. Otherwise, the function call must have exactly
   as many output sources as there are conversion specifications,
   and the conversion specifications must match the types of the
   output sources.

   Conversion specifications are matched to output sources in left-
   to-right order. Excess output pointers, if any, are ignored.