Print with colors in most shells (Python, standalone)

colors.py

class ColorPrinter:
    """
    Usage:
    cprint = ColorPrinter()
    cprint.cfg('c','m','bux').out('Hello','World!')
    cprint.rst().out('Bye now...')

    See: http://stackoverflow.com/a/21786287/472610 
    See: https://en.wikipedia.org/wiki/ANSI_escape_code
    """

    COLCODE = {
        'k': 0, # black
        'r': 1, # red
        'g': 2, # green
        'y': 3, # yellow
        'b': 4, # blue
        'm': 5, # magenta
        'c': 6, # cyan
        'w': 7  # white
    }

    FMTCODE = {
        'b': 1, # bold
        'f': 2, # faint
        'i': 3, # italic
        'u': 4, # underline
        'x': 5, # blinking
        'y': 6, # fast blinking
        'r': 7, # reverse
        'h': 8, # hide
        's': 9, # strikethrough
    }

    def __init__(self):
        self.rst()

    # ------------------------------
    # Group actions
    # ------------------------------

    def rst(self):
        self.prop = { 'st': [], 'fg': None, 'bg': None }
        return self
    
    def cfg(self,fg,bg=None,st=None):
        return self.rst().st(st).fg(fg).bg(bg)

    # ------------------------------
    # Set individual properties
    # ------------------------------

    def st(self,st):
        if isinstance(st,int):
            assert (st >= 0) and (st < 10), 'Style should be in {0 .. 9}.'
            self.prop['st'].append(st)
        elif isinstance(st,basestring):
            for s in st:
                self.st(self.FMTCODE[s]) 
        return self

    def fg(self,fg):
        if isinstance(fg,int):
            assert (fg >= 0) and (fg < 8), 'Color should be in {0 .. 7}.'
            self.prop['fg'] = 30+fg
        elif isinstance(fg,basestring):
            self.fg(self.COLCODE[fg])
        return self

    def bg(self,bg):
        if isinstance(bg,int):
            assert (bg >= 0) and (bg < 8), 'Color should be in {0 .. 7}.'
            self.prop['bg'] = 40+bg
        elif isinstance(bg,basestring):
            self.bg(self.COLCODE[bg])
        return self

    # ------------------------------
    # Format and standard output
    # ------------------------------

    def fmt(self,*args):

        # accept multiple inputs, and concatenate them with spaces
        s = " ".join(map(str,args))

        # get anything that is not None
        w = self.prop['st'] + [ self.prop['fg'], self.prop['bg'] ]
        w = [ str(x) for x in w if x is not None ]

        # return formatted string
        return '\x1b[%sm%s\x1b[0m' % ( ';'.join(w), s ) if w else s

    def out(self,*args):
        print self.fmt(*args)

fun main(args: Array<String>) {
    var aList = listOf(1, 2, 3)
    aList.forEach { it -> println(it) }

    (0..8).forEach { style ->
        (30 until 38).forEach { fg ->
            println()
            (40 until 48).forEach { bg ->
                var color = listOf(style.toString(), fg.toString(), bg.toString()).joinToString(";")
                print("\u001B[${color}m $color \u001B[0m")
            }
        }

    }
}