I know that this is ANSI color sequence, but what does this mean?
BLUE = "\x1b[38;05;4m"
\x1b is escape (ASCII 27)
What is 38? What is 05? and What is 4m?
It seems there are no such thing on the list?
Ah I see, wikipedia has more complete reference
38 is Reserved for extended set foreground color
05 is next is the color index
4 is color blue