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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def colorize(txt, fg=None, bg=None):
 """ Print escape codes to set the terminal color. fg and bg are indices into the color palette for the foreground and background colors. """


    setting = ''
    setting += _SET_FG.format(fg) if fg else ''
    setting += _SET_BG.format(bg) if bg else ''
    return setting + str(txt) + _STYLE_RESET