def _darkest(self):
min, n = (<NUM_LIT:1.0>, <NUM_LIT:1.0>, <NUM_LIT:1.0>), <NUM_LIT><EOL>for clr in self:<EOL><INDENT>if clr.r + clr.g + clr.b < n:<EOL><INDENT>min, n = clr, clr.r + clr.g + clr.b<EOL><DEDENT><DEDENT>return min<EOL>
Returns the darkest color from the list.

Knowing the contrast between a light and a dark swatch
can help us decide how to display readable typography.