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The following extra format sequences (see StrLiterals for the full specification) are added:

• \%<ccc><formatcode>(arguments) is interpolated as a call to cfmt("%<ccc><formatcode>",arguments), where <ccc><formatcode> is a C-style format string.

• and is [flags][width][.precision][length]

• supported flags are: , -, +, 0, #, and ' (add comma thousand separators)

• formatcode := d | D | u | U | o | O | x | X | e | E | f | F | g | G | a | A | c | C | s | S | i | p | n

• length is ignored (it was only needed for C/C++ since argument values don't have types)

• \%(value, arguments...) is interpolated as a call to fmt(value, arguments...). This is especially useful when defaults have been set for the type of the first argument.

• fmt_default!{T}(::Type{T}, syms::Symbol...; kwargs...) sets the defaults for a particular type.

• fmt_default!(syms::Symbol...; kwargs...) sets the defaults for all types.

• reset!{T}(::Type{T}) resets the defaults for a particular type.

• defaultSpec(x) will return the defaults for the type of x, and

• defaultSpec{T}(::Type{T}) will return the defaults for the given type.

Symbols that can currently be used are: :ljust or :left, :rjust or :right, :center, :commas, :zpad or :zeropad, and :ipre or :prefix. Several keyword arguments can also be used:

(supports most all options except for '%' currently)

• spec ::= [[fill]align][sign][#][0][width][,_][.prec][type]
• fill ::=
• align ::= '<' | '^' | '>'
• sign ::= '+' | '-' | ' '
• width ::=
• prec ::=
• type ::= 'b' | 'c' | 'd' | 'e' | 'E' | 'f' | 'F' | 'g' | 'G' | 'n' | 'o' | 'x' | 'X' | 's'

Please refer to https://docs.python.org/2/library/string.html#formatspec for more details

The syntax is slightly different, \{<formatspec>}(expression), instead of {variable:formatspec}, so as to fit better with Julia's string syntax.