pycharm代码问题

import turtle
q = turtle.pen()
turtle.bgcoloor("black")
sides = 7
colors =
["red","orange","yellow","gren","cyan","blue","purple"]
for x in range(360):
    q.pencolor(colors[x%sides])
    q.forward(x*3/sides+x)
    q.left(360/sides+1)
    q.width(x*sides/200)

在pycharm中输入这段代码后，第五行colors后的等号下有红色浪线报错。
请问这是什么问题？、需要怎么改动呢？