#NEWLINE# def __call__( self , keys ) : #NEWLINE# #INDENT# c = c . _c #NEWLINE# try : #NEWLINE# #INDENT# return tuple ( ( c [ 'rgba' . index ( k ) ] for k in keys ) ) #NEWLINE# #UNINDENT# except ValueError : #NEWLINE# #INDENT# raise IndexError ( 'Keys must be one of r, g, b, a' )