Format Symbol Conversion
%c Character (integer [ASCII value] or string of length 1)
%r String conversion via repr() prior to formatting
%s String conversion via str() prior to formatting
%d / %i Signed decimal integer
%u Unsigned decimal integer
%o (Unsigned) octal integer
%x/ %X (Unsigned) hexadecimal integer (lower/UPPERcase letters)
%e / %E Exponential notation (with lowercase 'e'/UPPERcase 'E')
%f / %F Floating point real number (fraction truncates naturally)
%g / %G The shorter of %e and %f/%E% and %F%
%% Percent character ( % ) unescaped
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