title: How to change color of shapes in Turtle through lists
body: <p>I was wondering if there was a way I can make a list of colors, like <code>shape_color = ['red', 'blue', 'green']</code>, and have that list assigned to a single <code>onkey()</code> keyboard key so that whenever I press that key, it cycles through the list of colors, changing the turtle's color? My program is in Python turtle graphics where you move the cursor around stamping different shapes into the screen. </p>