def parse_ctuple(s,length=<NUM_LIT:2>):
if parse_utuple(s, colrx_s, length=length) is None:<EOL><INDENT>raise ValueError("<STR_LIT>".format(s));<EOL><DEDENT>s=quote_subs(s,colorfix=True);<EOL>return evalt(s)<EOL>
parse a string of acceptable colors into matplotlib, that is, either
       strings, or three tuples of rgb. Don't quote strings.