Python solution, supports 1 or 3 arguments like CSS.
rgb = lambda *_: "#"+eval("'%02X'"+(lambda a:a.pop(len(_)>1)+a.pop())(["%_","*3"])) print(rgb(255)) # => #FFFFFF print(rgb(126, 28, 29)) # => #7E1C1D
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Python solution, supports 1 or 3 arguments like CSS.