打印颜色控制

none         = "\033[0m"  
black        = "\033[0;30m"  
dark_gray    = "\033[1;30m"  
blue         = "\033[0;34m"  
light_blue   = "\033[1;34m"  
green        = "\033[0;32m"  
light_green -= "\033[1;32m"  
cyan         = "\033[0;36m"  
light_cyan   = "\033[1;36m"  
red          = "\033[0;31m"  
light_red    = "\033[1;31m"  
purple       = "\033[0;35m"  
light_purple = "\033[1;35m"  
brown        = "\033[0;33m"  
yellow       = "\033[1;33m"  
light_gray   = "\033[0;37m"  
white        = "\033[1;37m"