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    <p>As both @chepner and @Shawabawa have mentioned, there isn't a mapping from the 3-tuple of a RGB code or a 6-digit hex to a single number with 8-bits (0-255). Indeed if there was, some information would have to be lost as the mapping is many to one. What you could do however, is use the (BASH) color codes as a starting point for building a Python script. For example, with the following variables:</p> <pre><code>txtblk='\e[0;30m' # Black - Regular txtred='\e[0;31m' # Red txtgrn='\e[0;32m' # Green txtylw='\e[0;33m' # Yellow txtblu='\e[0;34m' # Blue txtpur='\e[0;35m' # Purple txtcyn='\e[0;36m' # Cyan txtwht='\e[0;37m' # White bldblk='\e[1;30m' # Black - Bold bldred='\e[1;31m' # Red bldgrn='\e[1;32m' # Green bldylw='\e[1;33m' # Yellow bldblu='\e[1;34m' # Blue bldpur='\e[1;35m' # Purple bldcyn='\e[1;36m' # Cyan bldwht='\e[1;37m' # White unkblk='\e[4;30m' # Black - Underline undred='\e[4;31m' # Red undgrn='\e[4;32m' # Green undylw='\e[4;33m' # Yellow undblu='\e[4;34m' # Blue undpur='\e[4;35m' # Purple undcyn='\e[4;36m' # Cyan undwht='\e[4;37m' # White bakblk='\e[40m' # Black - Background bakred='\e[41m' # Red badgrn='\e[42m' # Green bakylw='\e[43m' # Yellow bakblu='\e[44m' # Blue bakpur='\e[45m' # Purple bakcyn='\e[46m' # Cyan bakwht='\e[47m' # White txtrst='\e[0m' # Text Reset </code></pre> <p>You can put it into a script, i.e.</p> <pre><code>cmd = "export PS1='%s'" prompt = "%s foo %s bar : " prompt = prompt % (undred, txtblu) print cmd % prompt </code></pre> <p>When I run the output, I get something like:</p> <pre><code>t@hydrogen:~/test/color$ python test.py export PS1='\e[4;31m foo \e[0;34m bar : ' t@hydrogen:~/test/color$ export PS1='\e[4;31m foo \e[0;34m bar : ' foo bar : </code></pre> <p>And now the foo is red and underlined, and bar is in blue.</p>
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